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The effect of nitrogen on the development and photosynthetic activity of digitaria eriantha steud. subsp. eriantha
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: MaureenM. Wolfson --- Department of Botany, C.F. Cresswell --- Department of Botany,Digitaria eriantha Steud. subsp. eriantha, plants were grown under controlled conditions and treated with different concentrations and forms of nitrogen. The plants showed a preference for nitrate nitrogen, as opposed to ammonium nitrogen, with greater total dry matter production and... -
Defoliation effects on resource allocation in Arizona cottontop (Digitaria californica) and Lehmann lovegrass (Eragrostis lehmanniana)
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: JerryR. Cox --- , Republic of South Africa M. Giner‐Mendoza --- , Mexico A.K. Dobrenz --- Plant Sciences Department, United States of America MarieF. Smith --- , Republic of South AfricaArizona cottontop (Digitaria californica), a bunchgrass native to the Chihuahuan and Sonoran Deserts in North America, and Lehmann lovegrass (Eragrostis lehmanniana), a bunchgrass introduced to the southwestern USA from southern Africa, were defoliated and examined for above‐ and below‐ground productivity,... -
The effect of leaf water potential on the carbon-dioxide uptake rate during different growth stages of wheat (Triticum aestivum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Human --- Department of Agronomy, Faculty of Agriculture, Republic of South Africa W.J. Roux --- Department of Agronomy, Faculty of Agriculture, Republic of South Africa L.P. de Bruyn --- Department of Agronomy, Faculty of Agriculture, Republic of South AfricaThe effect of water stress on the CO2 uptake rate was measured at three different growth stages of wheat grown in Mitscherlich pots in a glasshouse experiment. Stress was induced by withholding water until the leaf water potential reached −2... -
The effect of acetanilide herbicides on photosynthesis and respiration in isolated hypocotyl-epicotyl cells from three Phaseolus taxa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E. van Rensburg --- , Republic of South Africa L.P. van Dyk --- , Republic of South Africa G.H. de Swardt --- , Republic of South AfricaThe effect of alachlor [2-chloro-N-(2,6 diethylphenyl)-N-methoxymethyl) acetamide], metolachlor [2-chloro-N- (2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl) acetamide] and acetochlor [2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl) acetamide] on photosynthesis and respiration of isolated 10-day-old hypocotyl-epicotyl cells from three Phaseolus taxa was investigated. Herbicide concentrations of 1×10−12, 1×10−10, 1×10−8, 1×10−6,1×10−4 and 5×10−3 M... -
The influence of phosphorus on the tolerance of maize (Zea mays L.) to atrazine
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.F. Reinhardt --- Department of Plant Production, Republic of South Africa P.C. Nel --- Department of Plant Production, Republic of South AfricaGlasshouse and field studies were conducted to examine the effect of high phosphorus (P) application on the tolerance of the maize cultivar SSM2041 to atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-tria- zine]. Two glasshouse experiments were conducted. In one, seedlings were exposed to five P... -
Photosynthetic capacity and diurnal gas exchange of ‘Brookfield Gala’ apple leaves under three irrigation systems
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.C. Lebese --- Department of Horticultural Science, South Africa P.J.C. Stassen --- , South Africa S.J.E. Midgley --- Department of Horticultural Science, South AfricaWater and nutrient application using three irrigation systems, namely daily drip irrigation, pulsing drip irrigation and micro irrigation were studied with respect to photosynthetic efficiency, water use efficiency and leaf water relations in ‘Brookfield Gala’ apple trees during 2004/5 and... -
Ecophysiological responses of the salt marsh grass Spartina maritima to salinity
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Naidoo --- School of Biological and Conservation Sciences, South Africa Y Naidoo --- School of Biological and Conservation Sciences, South Africa P Achar --- Department of Biological and Physical Sciences, USAThe effects of salinity on growth and productivity of Spartina maritima (Curtis) Fernald were investigated in glasshouse and field experiments in 2008. In the glasshouse study, plants were subjected to 2%, 10%, 20%, 40% and 80% sea water, with tidal... -
Using chlorophyll fluorescence to determine stress in Eucalyptus grandis seedlings
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Carol A. Rolando --- , Keith M. Little --- ,Since several environmental factors affect the functioning of the photosynthetic system, the status of the photosynthetic apparatus is a good indicator of the plant in terms of stress and stress adaptation. The measurement of chlorophyll fluorescence with a portable fluorimeter... -
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... -
Effects of short-term water deficit stress on physiological characteristics of Bambara groundnut (Vigna subterranea (L.) Verdc.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Yusuf Y Muhammad --- School of Biosciences, Malaysia Sean Mayes --- Plant and Crop Sciences, School of Biosciences, UK Festo Massawe --- School of Biosciences, MalaysiaBambara groundnut (Vigna subterranea (L.) Verdc.) is an annual leguminous food crop native to Africa. The crop is grown in marginal soils and it is considered to be a drought-resistant species. However, there is limited information on the ways Bambara... -
Shade tolerance and suitability of tree species for planting in rubber plantations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Yaohua Tian --- Yunnan Institute of Tropical Crops, China Huifang Yuan --- Yunnan Institute of Tropical Crops, China Jiang Xie --- Yunnan Institute of Tropical Crops, China Yulong Zheng --- Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, ChinaThe rapid increase in rubber monoculture in Xishuangbanna has resulted in extensive damage to its local ecosystem. To decrease the negative effects, the concept of the ecological-economic rubber plantation (EERP) system was proposed. The EERP entails intercropping rubber plants with... -
Artificial light improves productivity of mini-cuttings in a clonal minigarden of Eucalyptus benthamii and E. dunnii
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Enéas Ricardo Konzen --- , Brazil Natália Saudade de Aguiar --- , Brazil Marcio Carlos Navroski --- , Brazil Clenilso Sehnen Mota --- , Brazil Leticia Miranda --- , Brazil Regiane Abjaud Estopa --- , Brazil Erasmo Luis Tonett --- , Brazil Mariane de Oliveira Pereira --- , BrazilEucalypts are economically important worldwide, being largely propagated by clonal means, that is, frequently achieved by mini-cuttings. Regional climatic conditions, however, interfere with this strategy. Southern Brazil, especially in higher altitudes, has a considerable number of cloudy and cold days...