Search
Search results for
We found
57 results for you
-
The Role of Genotype-Environment Interaction in Adaptability
Item type: Journal Article • Journal: South African Forestry Journal • Authors: P.J. Robbertse --- D.R. De Wet Forestry Research Centre,The over sites ratio of clonal (familial) genotype-environment interaction (GEI) variance to mean trial variance determines the regression that is used to predict adaptability. Genotypic and environmental variances do not contribute significantly to this regression. Genotype x environment interaction effects... -
Pine Provenance Research in South Africa: Promises and Problems
Item type: Journal Article • Journal: South African Forestry Journal • Authors: E.R. Falkenhagen --- ,Provenance research really started with the work of H.L. Duhamel Du Monceau on Pinus sylvestris in the eighteenth century. In South Africa the first properly designed provenance trials were established between 1934 and 1936 with the testing of five races... -
The Genetic Control of Ring Width, Wood Density and Tracheid Length in the Juvenile Core of Pinus patula
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.D. Barnes --- Forest Research Centre, Zimbabwe J.S. Birks --- , United Kingdom G. Battle --- Forest Research Centre, Zimbabwe L.J. Mullin --- Forest Research Centre, ZimbabweControlled crosses were made between six Pinus patula Schiede & Deppe plus trees selected in plantations. Six full-sib families and two commercial checks were planted in randomised complete block thrice-replicated progeny tests at two sites in Zimbabwe. At 7,5 years,... -
A field evaluation of the differential tolerance to soil acidity of forty-eight South African maize cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Ana Paula Mendes --- Summer grain Sub-Centre, M. P.W. Farina --- Summer grain Sub-Centre, P. Channon --- Summer grain Sub-Centre, Marie Smith --- Biometry Section, Directorate of Biometrie and Datametric Services,A field experiment was conducted on a Normandien clay loam (Plinthic Paleudult) to compare the acid tolerance of 48 commercially grown maize (Zea mays L.) cultivars. Cultivars were compared in terms of grain yield, plant height and leaf Al content... -
The nature of genotype × environment interactions for yield in wheat extension trials in the Winter Rainfall Region
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.F. Marais --- ,The necessity to subdivide the wheat producing soils of the Winter Rainfall Region for extension purposes, was considered. Use was made of correlations, interaction variance components and pattern analysis procedures to reflect on the possible existence of sub-environments with different... -
Genotipe × omgewingsinteraksie by winterkoring in die Oranje-Vrystaat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.S. van Deventer --- Departement Genetika, Republiek van Suid-AfrikaGesamentlike variansieanalises is uitgevoer op opbrengs, hektolitermassa en proteïeninhoud data verkry uit koring-evaluasieproewe wat in die Oranje-Vrystaat gedoen is. Die gebalanseerde datastelle het sewe winterkoringgenotipes, ingesluit wat op elk van 14 lokaliteite oor 'n periode van drie jaar geplant was... -
Genotipe—omgewingsinteraksie by sojabone
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. E.M. Odendaal --- , Republiek van Suid-Afrika C.S. van Deventer --- Departement Genetika, Republiek van Suid-Afrika'n Gekombineerde variansie-ontleding is uitgevoer op die saadopbrengste en proteïenpersentasies van die saad van 14 sojaboonkultivars wat op nege verskillende lokaliteite oor 3 jaar geëvalueer is. Variansiekomponente geassosieer met elke bron van variasie is beraam. Die verkreë resultate en implikasies... -
Comparison of cotton (Gossypium hirsutum L.) yield and fibre properties over locations and seasons
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. van Heerden --- , Republic of South Africa W.H. van Staden --- , Republic of South Africa G. Vink --- , Republic of South Africa H. van Ark --- , Republic of South AfricaThe cotton breeding program in the Republic of South Africa is conducted at the localities Loskop, Upington and Vaalharts. Preliminary results from breeding trials indicated that a finer but more mature fibre could be produced at Vaalharts as compared to... -
The success of the AMMI model in predicting lucerne yields for cultivars with differing dormancy characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MarieF. Smith --- , Republic of South Africa A. Smith --- , Republic of South AfricaThe AMMI model, which incorporates both additive and multiplicative components into an integrated, powerful, least squares analysis, is used for the analysis of cultivar trials at different localities. These trials are a major experimental component in crop production and plant... -
AMMI analysis of potato cultivar yield trials
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.J. Steyn --- , Republic of South Africa A.F. Visser --- , Republic of South Africa MarieF. Smith --- , Republic of South Africa J.L. Schoeman --- , Republic of South AfricaPotatoes, Solanum tuberosum (L), are cultivated in South Africa under a variety of different climates and seasons. The wide environmental variation encountered and the confirmed occurrence of genotype-environmental interaction necessitates the use of criteria, other than averages, in the evaluation... -
Multivariate assessment of environmental effects on hard red winter wheat. I. Principal-components analysis of yield and bread-making characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D. van Lili --- Small Grain Centre, Republic of South Africa J.L. Purchase --- Small Grain Centre, Republic of South Africa MarieF. Smith --- , Republic of South Africa G.A. Agenbag --- Department of Agronomy and Pastures, Republic of South Africa O.T. de Villiers --- Department of Agronomy and Pastures, Republic of South AfricaThe attributes of yield and bread-making quality of winter wheats produced in the Free State are subject to environmental effects. The result is a supply to the baking industry of flour of inconsistent quality, which in turn is detrimental to... -
Multivariate assessment of environmental effects on hard red winter wheat. II. Canonical correlation and canonical variate analysis of yield, biochemical and bread-making characteristics
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D. van Lili --- Small Grain Centre, Republic of South Africa J.L. Purchase --- Small Grain Centre, Republic of South Africa MarieF. Smith --- , Republic of South Africa G.A. Agenbag --- Department of Agronomy and Pastures, Republic of South Africa O.T. De Villiers --- Department of Botany, Republic of South AfricaThe inconsistent production of winter wheat with acceptable bread-making quality in the Free State reduces the commercial value of the wheat crop. In the second part of this study, canonical correlation analysis was used to determine to what extent variation... -
Determination of the preharvest sprouting resistance of South African winter wheat (Triticum aestivum L.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Annelie Barnard --- , Republic of South Africa J.L. Purchase --- , Republic of South Africa MarieF. Smith --- , Republic of South Africa D. van Lill --- Department of Food, Clothing and Hotel Management, Technicon Free State, Republic of South AfricaPreharvest sprouting significantly reduces the quality of the South African wheat crop. This study classified the preharvest sprouting resistance of 17 South African winter wheat cultivars sampled over a range of typical winter wheat growth environments. Sampling was performed under... -
Interaction between cultivar and soil fertility on grain yield, yield components and grain nitrogen content of wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: LewisA. Metho --- Department of Plant Production and Soil Science, South Africa P.S. Hammes --- Department of Plant Production and Soil Science, South Africa J.M. de Beer --- Department of Plant Production and Soil Science, South Africa H.T. Groeneveld --- Department of Statistics, South AfricaThe effect of soil nutrient status on the performance of four wheat cultivars was studied in a long-term field experiment at the University of Pretoria. The objective was to quantify the effect of soil nutrient status on yield, yield components... -
A quality assurance strategy for wheat (Triticum aestivum L.) where growth environment predominates
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D. van Lill --- Faculty of Applied Sciences, Technikon Free State, South Africa MarieF. Smith --- Department of Statistics, South AfricaThe variation in the processing quality of South African winter wheat cultivars over growth environments is detrimental to its market value. Variation in protein content has previously been identified as a primary contributor to this variation and should therefore be... -
Sources of variation for yield, protein content and hectolitre mass of spring wheat (Triticum aestivum L.) cultivars of the Western and Southern Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.M. Nel --- Department of Agronomy and Pastures, Republic of South Africa G.A. Agenbag --- Department of Agronomy and Pastures, Republic of South Africa J.L. Purchase --- , Republic of South AfricaIn the Western and Southern Cape the quality of wheat varies annually due to variable climatic conditions. This holds a commercial risk to the milling and baking industries in delivering the refined products to their respective clients. It is, therefore,... -
Genotype × environment interaction of winter wheat (Triticum aestivum L.) in South Africa: I. AMMI analysis of yield performance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.L. Purchase --- , Republic of South Africa Hesta Hatting --- , Republic of South Africa C.S. van Deventer --- Department of Plant Breeding, Republic of South AfricaThirteen winter and intermediate type bread wheat cultivars were evaluated under dryland conditions over a four year period from 1991 to 1994 and over 120 environments in the Free State province of South Africa. The Additive Main Effects and Multiplicative... -
Genotype × environment interaction of winter wheat (Triticum aestivum L.) in South Africa: II. Stability analysis of yield performance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.L. Purchase --- , Republic of South Africa Hesta Hatting --- , Republic of South Africa C.S. van Deventer --- Department of Plant Breeding, Republic of South AfricaThirteen winter and intermediate type bread wheat cultivars were evaluated for yield stability under dryland conditions over a four year period from 1991 to 1994 and over a total of 120 environments in the Western, Central and Eastern Free State... -
An explanation of genotype by environment interaction for maize in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Laubscher --- , Republic of South Africa C.Z. Roux --- Department of Genetics, Republic of South Africa J. M.P. Geerthsen --- Department of Genetics, Republic of South AfricaThe causes of genotype interaction with the environment was investigated using AMMI (Additive Main Effects and Multiplicative Interaction) analysis. AMMI quantified environments by means of E_IPCA1 (first principal component analysis for environment) such that it was highly significantly correlated (r... -
Ultrastructural changes caused by metazachlor on maize seedling leaves and root cells
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L. Kanyomeka --- Department of Plant Production and Soil Science, Faculty of Biological and Agricultural Sciences, South Africa C.F. Reinhardt --- Department of Plant Production and Soil Science, Faculty of Biological and Agricultural Sciences, South AfricaMaize (Zea mays L.) genotypes exhibit differential tolerance to metazachlor (2-chloro-N-(pyrazol-1-ylme-thyl)acet-2′-6′-xylidide) in the greenhouse and in the field. However, since little is known on the effect of metazachlor on the ultrastructure of maize seedlings, laboratory experiments were conducted to determine... -
Stability analysis of grain yield of tef (Eragrostis tef) using the mixed model approach
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.D. Kassa --- Discipline of Statistics & Operations Research, Republic of South Africa MarieF. Smith --- Biometry Unit, Republic of South Africa H. Fufa --- , EthiopiaMulti-environment trials are usually used to assess the grain yield stability of genotypes. Most of the common stability measures such as Finlay and Wilkinson (1963), Eberhart and Russell (1966) and Shukla (1972), can be accommodated by a linear mixed model... -
Genotype × environment interaction for root yield of elite sweet potato (Ipomoea batatas (L) lam.) genotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Tekalign --- Department of Plant Sciences, EthiopiaA study was conducted to determine stability of root yield, and the nature and magnitude of genotype × environment interaction in sweet potato using six recently introduced and one farmers' cultivar, which were grown at four locations for three consecutive... -
Additive mean effects and multiplicative interaction analysis of maize yield trials in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S. H. Ma’ali --- , South AfricaThirty five maize hybrids were evaluated over 98 environments for genotype x environment interaction (GEI) and yield stability under dry land conditions during the 2003 to 2006 seasons in the eastern and western maize production regions of South Africa. The... -
Physiological traits associated with drought tolerance in bread wheat (Triticum aestivum L.) under tropical conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.K. Kimurto --- Department of Crop and Soil Sciences, Kenya J.B.O. Ogola --- Department of Plant Production, South Africa M.G. Kinyua --- Department of Crop Science and Biotechnology, Kenya J.M. Macharia --- Department of Botany, Kenya P.N. Njau --- , KenyaAlthough it is generally accepted that drought tolerance is a critical agronomic trait, efficient and predictable improvement in drought tolerance in bread wheat (Triticum aestivum L.), in varying drought stress conditions, has not been fully achieved. This study aimed at... -
Targeting of early to intermediate maize hybrids for yield performanceand yield stability using SREG model
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Setimela --- , Zimbabwe J. Crossa --- CIMMYT Km, D.F Mexico M. Bänziger --- CIMMYT Km, D.F MexicoThe effectiveness of targeting and predicting maize (Zea mays.L) hybrid performance is difficult when the magnitude of genotype x environment (GE) interaction and yield prediction cannot be interpreted and is only based on genotypes (G) and GE means. The traditional... -
Optimum replications and crop-years for sugarcane genotype trials at Dwangwa Sugar Estate in Malawi
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MM Zhou --- , South Africa A Chihana --- , Malawi RC Parfitt --- , South AfricaThe ability to detect significant differences among genotypes in trials depends on the variance associated with the means. Dwangwa Sugar Estate, Malawi, imports genotypes from the South African Sugarcane Research Institute (SASRI) to test for possible commercial release. The objective... -
Morphological characters and ascorbic acid content of an elite genotype of Corchorus olitorius: the influence of moisture stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AnofiOT Ashafa --- Department of Plant Sciences, South Africa AbidemiA Abass --- Department of Botany, Nigeria Titilola Osinaike --- Department of Botany, Nigeria FrancisB Lewu --- Agriculture Department, South AfricaMoisture stress can be deleterious to physicochemical properties of crop species to a varying degree. The influence of moisture stress on the ascorbic acid content in the leaf and morphological characters of an elite genotype of Corchorus olitorius were tested... -
An investigation into the occurrence and nature of genotype by environment interaction in Pinus patula
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: C.L. Snedden --- , South Africa S.D. Verryn --- , South AfricaThis study was conducted as part of a joint venture between the tree improvement teams of Safcol and the CSIR to develop a breeding, production and conservation strategy for Pinus patula. -
Genotype by environment interaction for volume growth at 6 years of age in a series of five Pinus patula progeny trials in southern Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Arnulf Kanzler --- Sappi Forest Research, South Africa Sieg F. Hagedorn --- , South Africa Gary R. Hodge --- CAMCORE, USA William S. Dvorak --- CAMCORE, USAGenotype x environment interaction was investigated in a series of 5 Pinus patula progeny trials planted by the Institute for Commercial Forestry Research in southern Africa. The trials were established from Mpumalanga to the North-eastern Cape in a balanced 7x7... -
Growth potential of Eucalyptus cypellocarpa as an alternative species for the mid-altitude summer rainfall region of South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Christopher Komakech --- Forestry and Forestry Products, South Africa Tammy-L Swain --- , South Africa Annabel Fossey --- Biotechnology, South AfricaEucalyptus grandis is predominantly cultivated in the humid, warmer temperate, subtropical regions in South Africa for pulp and paper production because of its rapid growth and desirable wood properties. With forestry expanding into mid-altitude drier and warmer, or drier and... -
Genetic characterisation of a Eucalyptus nitens base breeding population in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Tammy-L Swain --- Institute for Commercial Forestry Research, South Africa SteveD Verryn --- Forestry and Agricultural Biotechnology Institute, South Africa MarkD Laing --- School of Agricultural Earth and Environmental Sciences, South AfricaThe measurement and statistical analysis of data from eight Eucalyptus nitens trials, established in the summer rainfall forestry region of South Africa during the 1980s and 1990s, have enabled the characterisation of the Institute for Commercial Forestry Research's breeding population... -
Phenotypic plasticity and local adaptation in two extreme populations of Acacia karroo
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G Bayonne Mboumba D WardPhenotypic plasticity is the effect of growth variability in response to different environmental conditions. Adaptive phenotypic plasticity is more specific; it is the ability of a single genotype to produce an array of phenotypes depending on the environmental extent. We... -
Genotype × environment interactions and yield stability of stress-tolerant open-pollinated maize varieties in the Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Vimbayi GP Chimonyo --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Charles S Mutengwa --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Cornelius Chiduza --- Department of Agronomy, Faculty of Science and Agriculture, South AfricaGenotype × environment interactions are inherent in multilocational trials and complicate identification of superior genotypes. The aim of the study was to determine yield performance and stability of 13 maize genotypes in five locations of the Eastern Cape province, South... -
Genetic diversity of Amaranthus species in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Abe S Gerrano --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South Africa Willem S Jansen van Rensburg --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South Africa Patrick O Adebola --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South AfricaAmaranthus species plays an important role in sustaining food security and alleviation of malnutrition in South Africa. A number of Amaranthus genotypes have been collected and conserved in the gene bank of the ARC–Roodeplaat Vegetable and Ornamental Plant Institute, South... -
Phenotypic characterisation of sweetpotato genotypes grown in East and Central Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Rukundo Placide --- African Centre for Crop Improvement, South Africa Hussein Shimelis --- African Centre for Crop Improvement, South Africa Mark Laing --- African Centre for Crop Improvement, South Africa Daphrose Gahakwa --- Rwanda Agriculture Board, RwandaIdentification of genetic variability and interrelationships among germplasm collections is fundamental to select parents with complementary traits for plant breeding programmes. The aim of this study was to characterise and identify breeding parents among 54 sweetpotato genotypes grown in Rwanda,... -
Growth Performance of Two Crossbred Rabbit Genotypes Fed Two Levels of Dietary Protein
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: O. M. Momoh --- Department of Animal Breeding and Physiology, H. U. Unung --- Department of Animal Breeding and Physiology, S. Attah --- Department of Animal Production, NigeriaA study was undertaken in which two crossbred rabbit genotypes were fed two levels of dietary crude protein with the objectives of assessing and comparing their growth performances as well as investigate any possible genotype × protein level interaction. Twenty-four... -
Agronomic performance of new cream to yellow-orange sweetpotato cultivars in diverse environments across South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sunette M Laurie --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute (ARC-VOPI), South Africa Sidwell S Tjale --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute (ARC-VOPI), South Africa Andre A van den Berg --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute (ARC-VOPI), South Africa Musa M Mtileni --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute (ARC-VOPI), South Africa Maryke T Labuschagne --- Department of Plant Sciences, South AfricaSweetpotato is grown in diverse environments of South Africa by both commercial and subsistence farmers. The aim of the present study was to assess the stability, agronomic performance and palatability of new ARC cultivars bred for the informal market, and... -
Prevalence of Helicobacter pylori cagA and vacA allelic variants and associated disease outcomes in Kenyan patients with dyspepsia
Item type: Journal Article • Journal: Southern African Journal of Epidemiology and Infection • Authors: A.N. Kimang'a --- Department of Medical Microbiology, KenyaAlthough Helicobacter pylori has been linked to various gastric disorders in Western countries and Asia, its aetiopathological role in African populations is controversial. The aim of this study was to investigate the role of H. pylori and its virulence genotypes... -
Molecular detection and characterisation of mumps virus in cerebrospinal fluid in a Gauteng laboratory
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: Marieke Brauer --- Faculty of Health Sciences, Department of Medical Virology, South Africa Marianne Wolfaardt --- Faculty of Health Sciences, Department of Medical Virology, South Africa Lynne M Webber --- Faculty of Health Sciences, Department of Medical Virology, South Africa Maureen B Taylor --- Faculty of Health Sciences, Department of Medical Virology, South AfricaThe study aimed to determine the presence of mumps virus (MuV) in cerebrospinal fluid (CSF) specimens and to genetically characterise detected MuV strains. A real-time reverse transcription-polymerase chain reaction (RT-PCR) was used to detect the MuV F gene, and characterisation... -
Genotype-based personalised nutrition for obesity prevention and treatment: are we there yet?
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: M. Senekal --- Associate Professor; Head: Division of Human Nutrition; Department of Human Biology,Interactions between genotype and dietary intake include genetic moderation of the effect of dietary intake on disease development (nutrigenetics). Research on nutrigenetics has focused mainly on single-nucleotide polymorphisms (SNPs) and supports the notion that interactions between genes, diet, other lifestyle... -
Agromorphological diversity of South African sorghum genotypes assessed through quantitative and qualitative phenotypic traits
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Alina M Mofokeng --- Agricultural Research Council–Grain Crops Institute, South Africa Hussein A Shimelis --- School of Agricultural, Earth and Environmental Sciences, African Centre for Crop Improvement, South Africa Mark D Laing --- School of Agricultural, Earth and Environmental Sciences, African Centre for Crop Improvement, South AfricaKnowledge of genetic diversity among sorghum genotypes is essential for their efficient utilisation in plant breeding schemes and effective conservation. The objective of this study was to assess the level of genetic diversity present among South African sorghum genotypes using... -
Trends and magnitudes of genotype × environment interaction variance components for yield, quality and agronomic traits among coastal short cycle sugarcane breeding populations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sphamandla Sengwayo --- South African Sugarcane Research Institute, South Africa Marvellous Zhou --- South African Sugarcane Research Institute, South Africa Maryke Labuschagne --- University of the Free State, South AfricaGenotype × environment interactions (G×E) can reduce the genetic contribution to the phenotype and increase minimum detectable differences, which eventually reduce selection precision. This study was conducted to determine the magnitudes and trends of G×E variance components for sugarcane yield,... -
Genotypic variation in tree growth and selected flavonoids in leaves of Cyclocarya paliurus
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Yanni Cao --- College of Forestry, China Bo Deng --- College of Forestry, China Shengzuo Fang --- College of Forestry, China Xulan Shang --- College of Forestry, China Xiangxiang Fu --- College of Forestry, China Wanxia Yang --- College of Forestry, ChinaCyclocarya paliurus is a valuable medicinal tree species in China. However, limited information is available on its genotype selection and cultivation for improvement of growth and health-promoting phytochemicals. To contribute to improved knowledge of the potential use of the species,... -
Location and crop-year effects on sugarcane genotype performance for the coastal short cycle breeding programmes in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sphamandla Sengwayo --- South African Sugarcane Research Institute, South Africa Marvellous Zhou --- South African Sugarcane Research Institute, South Africa Maryke Labuschagne --- Department of Plant Sciences, South AfricaGenotypes are tested in several environments to evaluate the influence of genotype × environment interactions prior to their release as cultivars. The objective of this study was to determine location and crop-year effects and their implications on coastal short cycle... -
Phenotypic characterisation of potato (Solanum tuberosum) genotypes in Uganda
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Prossy Namugga --- African Centre for Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa Julia Sibiya --- African Centre for Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa Rob Melis --- African Centre for Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa Alex Barekye --- Kachwekano Zonal Agricultural Research and Development Institute, UgandaIdentification of genetic variation and interrelationships among germplasm collections is essential for parental selection and trait identification among parents for use in breeding programmes. The aim of this study was to characterise 48 potato genotypes to identify suitable parents for... -
Comparing family with individual genotype breeding parameters for cane yield in sugarcane populations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Ntombokulunga W Mbuma --- South African Sugarcane Research Institute, South Africa Marvellous M Zhou --- South African Sugarcane Research Institute, South Africa Rouxlene van der Merwe --- Department of Plant Sciences, South AfricaFamily selection is the positive advancement of all progenies from a cross and is widely practiced in breeding for sugarcane and other crops. The objective of this study was to compare family with individual genotype selection (IGS) for cane yield... -
Lesion size induced by Chrysoporthe fungal pathogens varies between Eucalyptus species and geographic locations in Zambia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Donald Chungu --- Department of Plant and Environmental Sciences, School of Natural Resources, Zambia Jedrick Siyingwa --- Department of Plant and Environmental Sciences, School of Natural Resources, Zambia Phillimon Ng’andwe --- Department of Biomaterial Science and Technology, School of Natural Resources, Zambia Bertha Chitala Chungu --- School of Business, ZambiaChrysoporthe canker disease is one of the serious threats facing planted Eucalyptus in southern Africa. In order to manage this disease, planting of less susceptible species of Eucalyptus has been promoted in many countries but it is not clear which... -
Genomic resources for the spotted ragged-tooth shark Carcharias taurus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JD Klein --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa AE Bester-van der Merwe --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa ML Dicken --- KwaZulu-Natal Sharks Board, South Africa A Emami-Khoyi --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa KL Mmonwa --- KwaZulu-Natal Sharks Board, South Africa PR Teske --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South AfricaGenomic data can be a useful tool in the management and conservation of biodiversity. Here, we report the development of genomic resources for the spotted ragged-tooth shark Carcharias taurus using genome-wide DNA data from Illumina next-generation sequencing. We explored two... -
Genetic diversity of endangered sandalwood (Osyris lanceolata) populations in Kenya using ISSR molecular markers
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: KP Andiego --- Department of Forestry and Wood Science, Kenya OG Dangasuk --- Department of Biological Sciences, Kenya DW Odee --- Biotechnology Laboratory, Kenya FS Omondi --- Biotechnology Laboratory, Kenya DF Otieno --- Department of Biological Sciences, Kenya BK Balozi --- Department of Forestry and Wood Science, KenyaOsyris lanceolata is an evergreen, drought tolerant tropical African tree species belonging to the family Santalaceae. It is endangered, owing to overexploitation for its essential oil used in cosmetics and pharmaceutical industries. The study aimed at determining: (1) the genetic... -
Genotype-by-environment interaction and yield stability of sunflower hybrids across production environments in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Safiah Ma’ali --- Agricultural Research Council–Grain Crops, South Africa William Makgoga --- Agricultural Research Council–Grain Crops, South Africa Jan Erasmus --- Agricultural Research Council–Grain Crops, South Africa Sophie Swanepoel --- Agricultural Research Council–Grain Crops, South AfricaGenotype-by-environment interaction (GEI) is typical in multi-environment trials, which complicates the identification of superior genotypes, making selection and recommendation of new sunflower genotypes for different environments challenging and expensive. The objectives of this study were to investigate the GEI, identify... -
Genotype-by-environment interaction of grain yield among candidate dryland wheat genotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Miriam Matlala --- African Centre for Crop Improvement, South Africa Hussein Shimelis --- African Centre for Crop Improvement, South Africa Jacob Mashilo --- African Centre for Crop Improvement, South AfricaGenotype-by-environment interaction (GEI) analysis is an essential step to identify superior and stable yielding genotypes and suitable test environments for cultivar development. The objective of the present study was to examine GEI of grain yield among candidate dryland wheat genotypes... -
Diversity analysis of mungbean (Vigna radiata) germplasm using a semi-graphical technique
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Hafiz Basheer Ahmad --- Oilseed Research Institute, Ayub Agricultural Research Institute, Pakistan Salsabeel Rauf --- Oilseed Research Institute, Ayub Agricultural Research Institute, Pakistan Waqas Shafqat Chattha --- Department of Plant Breeding and Genetics, Pakistan Busharat Hussain --- Pulses Research Institute, Ayub Agricultural Research Institute, Pakistan Iqtidar Hussain --- Department of Agronomy, Pakistan Irfan Rasool --- Pulses Research Institute, Ayub Agricultural Research Institute, PakistanGrain legumes such as mungbean are often co-cultivated with cereals. The genetic diversity among 84 mungbean genotypes was studied using metroglyph and principal component analysis. Data were recorded for days to flowering and maturity, plant height, pods per plant, clusters... -
Optimising the number of test sites, crop-years and replications to maximize post-release testing efficiencies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sbongeleni Warren Duma --- School of Agricultural, Earth and Environmental Sciences, South Africa Hussein Shimelis --- School of Agricultural, Earth and Environmental Sciences, South Africa Sanesh Ramburan --- School of Agricultural, Earth and Environmental Sciences, South Africa Admire Isaac Tichafa Shayanowako --- School of Agricultural, Earth and Environmental Sciences, South AfricaThe South African sugar industry develops commercial sugarcane cultivars across multiple testing sites, crop-years and replications. The extent of such parameters has not been well quantified for optimum breeding and resource allocation. The objective of this study was to identify... -
Genetic differentiation of selected drought and heat tolerant wheat genotypes using simple sequence repeat markers and agronomic traits
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sonto Silindile Mkhabela --- , South Africa Hussein Shimelis --- , South Africa Jacob Mashilo --- , South AfricaDevelopment of wheat (Triticum aestivum L.) varieties with increased yield potentials that are adapted to drought and heat stresses requires genetically differentiated and complementary parents. The present study established genetic profiles of heat and drought tolerant wheat genotypes through SSR... -
Estimation of genetic parameters for growth in a population of Eucalyptus grandis × Eucalyptus nitens hybrids in KwaZulu-Natal and Mpumalanga
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: W Brink --- Sappi Shaw Research Centre, South Africa G van den Berg --- Sappi Shaw Research Centre, South Africa A Nel --- Sappi Shaw Research Centre, South Africa B du Toit --- University of Stellenbosch, South AfricaHybridising Eucalyptus grandis with Eucalyptus nitens produces progeny intended to combine the favourable traits of both parents. E. grandis exhibits good growth, stem form, wood properties and rooting ability for vegetative propagation. E. nitens displays superior cold tolerance, including superior... -
Provenance variation, genetic parameters, and potential gains in Eucalyptus viminalis subsp. nobilis tested in two high altitude cool temperate sites in the summer rainfall region of South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Christopher Komakech --- , South Africa Annabel Fossey --- , South AfricaOver the past 50 years, commercial forestry in South Africa has expanded into mid and high altitude summer rainfall regions, predominantly planting Eucalyptus nitens and Eucalyptus macarthurii. However, the suitability of these sites is increasingly threatened by projected climate changes... -
High population differentiation of Okpe River Talbotiella gentii at Anum Boso, Ghana, uncovered by RAPD
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Daniel Dompreh --- Kwame Nkrumah University of Science and Technology, Ghana Adam Price --- University of Aberdeen, UK Michael David Swaine --- University of Aberdeen, UKTalbotiella gentii Hutch. & Greenway is an endemic, severely threatened and fragmented species in Ghana. Though it is a highly valued non-timber product, it faces the threat of extinction from wildfire, and exploitation for charcoal and fuelwood, agriculture and building...