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Determining Transpiration from Pinus patula Shoots—A Comparative Evaluation of the Cut-Shoot Method and Two Null-Balance Diffusion Porometers
Item type: Journal Article • Journal: South African Forestry Journal • Authors: P.J. Dye --- D.R. de Wet Forestry Research Centre Division of Forest Science and Technology, S.I. Christie --- D.R. de Wet Forestry Research Centre Division of Forest Science and Technology, B.W. Olbrich --- D.R. de Wet Forestry Research Centre Division of Forest Science and Technology, E. Ferreira --- D.R. de Wet Forestry Research Centre Division of Forest Science and Technology, N. Tallon --- D.R. de Wet Forestry Research Centre Division of Forest Science and Technology,The cut-shoot method and two types of small-chambered null-balance diffusion porometer were evaluated for suitability in studies of stomatal conductance and transpiration in Pinus patula. In the course of the cut-shoot evaluation, excised shoots were found to transpire at a... -
Changes in plant water relations of wheat and soybeans after relief of water stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sue Walker --- Department Land, Air and Water Resources, Veihmeyer Hall, U.S.A. D.M. Oosterhuis --- Department of Agronomy, U.S.A. Judy Eastham --- , Republic of South AfricaThe ability of a crop to recover from a mild or severe water stress and the rate of recovery are of importance for irrigation management and are also linked to the drought resistance and water use efficiency of the crop... -
Stomatal resistance measurement as an indicator of water deficit stress in wheat and soybeans
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.M. Oosterhuis --- Department of Agronomy, U.S.A. Sue Walker --- Department Land, Air and Water Resources, Veihmeyer Hall, U.S.A.The usefulness of stomatal response as an indicator of the onset and development of water stress was studied over five seasons in field-grown wheat (Triticum aestivum L.) and soybeans (Glycine max L. Merr.). With the onset of water stress, stomatal... -
An hypothesis concerning the development of the red leaf disorder in cotton (Gossypium hirsutum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- , Republic of South AfricaThe development of the physiological disorder of cotton known as ‘rooidood’, ‘red leaf disorder’ or ‘potassium deficiency syndrome’ has not yet been explained. Several stress conditions have been associated with this disorder, including low N levels in leaves, low K... -
Die invloed van verskillende waterregimes op Up-to-date aartappels I. Vegetatiewe ontwikkeling, fotosintesetempo en stomatadiffusieweerstand
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.M. Steyn --- , Republiek van Suid-Afrika H.F. du Plessis --- , Republiek van Suid-Afrika P.F. Nortjé --- , Republiek van Suid-AfrikaDrie grondwaterregimes (20, 50 en 70% onttrekking van plantbeskikbare water) is gedurende herfsaanplan- tings in 1987 en 1988 op Up-to-date aartappels toegepas om die invloed daarvan op groei en ontwikkeling te ondersoek. Twee fisiologiese parameters van plantwaterstremming, naamlik, fotosintesetempo en... -
Fotosintesetempo en stomatadiffusieweerstand van aartappels soos beïnvloed deur waterstremming
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.F. du Plessis --- , Republiek van Suid-Afrika J.M. Steyn --- , Republiek van Suid-AfrikaDie invloed van waterstremming in aartappelplante op netto fotosintesetempo en stomatadiffusieweerstand is tydens 'n herfsaanplanting ondersoek. Watertoediening is op 14, 28 en 42 dae na opkom gestaak om sodoende verskillende waterstremmingsperiodes tydens die groeiseisoen toe te pas. Hierdie Studie is... -
Boundary layer, stomatal geometry and -spacing, in relation to drought tolerance in four Nicotiana tabacum L. cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L. Van Rensburg --- , Republic of South Africa J. Peacock --- , Republic of South Africa G. H.J. Krüger --- Department of Plant and Soil Sciences, Republic of South AfricaAlthough numerous studies, both phenomenological and mathematical, have related gaseous interchanges at the plant leaf surface and atmospheric interface specifically with regard to drought tolerance, the important role of trichomes and the boundary layer has not been recognized. In this... -
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... -
Growth, phenological and yield responses of a bambara groundnut (Vigna subterranea (L.) Verdc.) landrace to imposed water stress under field conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tafadzwanashe Mabhaudhi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa AlbertT Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaBambara groundnut (Vigna subterranea (L.) Verdc.) is an underutilised species with potential to contribute nutritional and food security in marginal areas. Growth, phenology and yield of a local bambara groundnut landrace from Jozini, KwaZulu-Natal, characterised into three selections according to... -
Response to elevated CO2 from a natural spring in a C4-dominated grassland depends on seasonal phenology
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: SJE Wand GF Midgley WD StockA South African C4-dominated grassland was exposed to twice-ambient atmospheric CO2 concentration using gas emitted by a natural CO2 spring and distributed over a 7m x 7m plot. A similar control plot was established 20m away at near-ambient CO2 concentrations... -
Comparative investigation of physiological responses of field-grown alfalfa and tall fescue to cutting under different water regimes
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M Lazaridou --- Department of Forestry, Greece P Kostopoulou --- School of Forestry and Natural Environment, Greece M Karatassiou --- School of Forestry and Natural Environment, Greece G Merkouropoulos --- Centre for Research and Technology Hellas, GreeceAn important consideration in designing and managing forage systems is the knowledge of the physiological response mechanisms to cutting, especially when water deficit conditions are prevailing. The objective of this study was to determine the physiological response of Medicago sativa... -
Physiological responses of Eucalyptus nitens × nitens under experimentally imposed water stress
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MEO Mokotedi --- School of Biological and Conservation Sciences, Biological Sciences Building, South Ring Road, Westville Campus, South AfricaThis study reports on how a cold- and frost-tolerant clone of Eucalyptus nitens × nitens responds to drought stress. The aim was to identify physiological traits that contribute to drought acclimation. Macropropagated saplings were grown in a climate-controlled greenhouse in... -
Stomatal characteristics of Eucalyptus grandis clonal hybrids in response to water stress
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: AlanaB Eksteen --- School of Life Sciences, South Africa Valerie Grzeskowiak --- Sappi Forests, South Africa NickyB Jones --- Sappi Forests, South Africa NormanW Pammenter --- School of Life Sciences, South AfricaThis study describes the stomatal response occurring during water stress and subsequent recovery of three Eucalyptus grandis clonal hybrids. The aim was to investigate the degree to which stomatal conductance (g s) and stomatal density differ between the clonal hybrids... -
Water relations of Eucalyptus nitens × Eucalyptus grandis: is there interclonal variation in response to experimentally imposed water stress?
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: ME Oscar Mokotedi --- CSIR Natural Resources and the Environment, South AfricaThis study tested the hypothesis that water stress increases the hydraulic efficiency of Eucalyptus nitens × E. grandis saplings as a result of osmotic and elastic adjustments. Eucalyptus nitens × E. grandis clones (NH00, NH58, NH69 and NH70) were potted... -
Growth, physiology and yield responses of Amaranthus cruentus, Corchorus olitorius and Vigna unguiculata to plant density under drip-irrigated commercial production
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Innocent Maseko --- University of South Africa, South Africa Yacob G Beletse --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South Africa Noluyolo Nogemane --- University of South Africa, South Africa CP du Plooy --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South Africa Tafadzwanashe Mabhaudhi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaAmaranthus cruentus, Corchorus olitorius and Vigna unguiculata are traditional leafy vegetables with potential to improve nutritional security of vulnerable people. The promotion of these crops is partly hindered by the lack of agronomic information. The effect of plant spacing on... -
Growth and yield of African ginger in response to application of organic fertiliser
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Phomolo Maphothoma --- , Riana Kleynhans --- , Gerhard Prinsloo --- , Salmina N Mokgehle --- , Ian du Plooy --- , Hintsa T Araya --- ,African ginger (Siphonochilus aethiopicus) is in high demand for medicinal use. The plant does not multiply after being harvested, as it is destroyed in the process. The species is now facing extinction as a result of over harvesting. In order... -
Morphological and physiological responses of Calobota sericea plants subjected to water limitation and subsequent rewatering
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Francuois Müller --- Agricultural Research Council – Animal Production: Range and Forage Sciences, South Africa Lincoln Raitt --- University of the Western Cape, South Africa Lilburne Cyster --- University of the Western Cape, South Africa Samson Chimphango --- University of Cape Town, South Africa M Igshaan Samuels --- Agricultural Research Council – Animal Production: Range and Forage Sciences, South Africa Clement Cupido --- Agricultural Research Council – Animal Production: Range and Forage Sciences, South Africa J Stephen Boatwright --- University of the Western Cape, South AfricaCalobota sericea is a native legume of South Africa, confined to the water-limited rangelands, and it has recently been prioritised for additional characterisation regarding its pasture potential. In this study, we examined the growth characteristics of C. sericea under glasshouse... -
Assessing technological capability of innovative stress detection tools in forestry for the improvement of commercial production: a South African perspective
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Regardt Ferreira --- School of Natural Resource Management, South Africa Kabir Peerbhay --- Sappi Shaw Research Centre, South Africa Josua Louw --- School of Natural Resource Management, South Africa Ilaria Germishuizen --- Institute for Commercial Forestry Research, South Africa Naeem Agjee --- Sappi Shaw Research Centre, South Africa Mikka Parag --- University of KwaZulu-Natal, South AfricaThere is a constant need for efficient screening methods of plant physiological stress in nursery and plantation forestry systems. Most stress is assessed visually, which can be subjective and requires manpower that is time-consuming and expensive. However, as technology has...