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Genetic analyses of grey leaf spot infection of maize in a single location 12 × 12 diallel
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Hohls --- Department of Genetics, Republic of South Africa P.E. Shanahan --- Department of Genetics, Republic of South Africa G. P.Y. Clarke --- Department of Statistics and Biometry, Republic of South Africa H.O. Gevers --- , Republic of South AfricaThe inheritance of resistance to grey leaf spot of maize (Zea mays L.), caused by Cercospora zeae-maydis, was studied using a 12 × 12 diallel cross. Information on the heterotic performance of the inbred lines enabled identification of patterns of... -
An incomplete block design for reducing competition between inbreds and hybrids in a diallel cross experiment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Hohls --- Department of Genetics, Republic of South Africa G. P.Y. Clarke --- Department of Statistics and Biometry, Republic of South AfricaInterplot competition in plant breeding experiments can substantially reduce the efficiency of plant selection. In diallel experiments on outcrossing species such as maize (Zea mays L.), competing stresses might result from differences in vigour between inbred and hybrid entries. A... -
Inheritance of flavour in six tomato (Lycopersicon esculentum) varieties
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: KarenA. Lunt --- Department of Genetics, Republic of South Africa C.Z. Roux --- Department of Genetics, Republic of South Africa I. Blokpoel --- , Republic of South Africa Mardè Booyse --- , Republic of South AfricaFlavour component differences between six tomato varieties and their F1, progenies were investigated. A diallel crossing system, excluding the reciprocal crosses was used. The F-1 and parent varieties were compared by carrying out a sensory evaluation and a chemical component... -
Estimates of combining ability for agronomic traits in pepper (Capsicum annuum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.F. Geleta --- Department of Plant Sciences, South Africa M.T. Labuschagne --- Department of Plant Sciences, South AfricaTwenty-one F1 hybrids were obtained from non-reciprocal crosses among seven genetically diverse pepper genotypes. The parents and F1 (S were evaluated for combining ability and the relative importance of additive and non-additive gene action. The plants were grown in a... -
Genetic parameters and genotype by environment interaction of Eucalyptus grandis populations used in intraspecific hybrid production in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Gert J van den Berg --- Mondi Forests (Pty) Ltd, South Africa Steven D Verryn --- , South Africa Paxie W Chirwa --- Faculty of Natural and Agricultural Sciences, South Africa Francois van Deventer --- Mondi Forests (Pty) Ltd, South AfricaIn South Africa, Eucalyptus grandis is an important species due to its fast growth and general suitability of its timber for a range of products. However, E. grandis is susceptible to fungal diseases such as Crysoporthe austroafricana and Coniothyrium sp... -
Honeybush (Cyclopia spp.) anther-stigma distance and intraspecies cross compatibilities
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jenifer Koen --- , South Africa Martha M. Slabbert --- , South Africa Mardé Booyse --- , South Africa Cecilia Bester --- , South AfricaSpecies of Cyclopia are used to produce honeybush tea, a uniquely South African beverage that is rapidly growing in popularity locally and abroad. In response to warnings about ecological sustainability, the honeybush industry is transitioning from a wild-harvested source model... -
Combining ability of bread wheat genotypes for yield and yield-related traits under drought-stressed and non-stressed conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Yared Semahegn --- , South Africa Hussein Shimelis --- , South Africa Mark Laing --- , South Africa Isack Mathew --- , South AfricaDrought is a major cause of reduced yields in dryland wheat production. This study aimed to determine the combining ability effects of selected bread wheat genotypes (Triticum aestivum L.) for yield and yield-related traits. Eight parental lines were selected and...