Browsing Faculty of Natural and Agricultural Sciences by Author "10172866 - Krüger, Gert Hendrik Jacobus"
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Assessment of changes in photosystem II structure and function as affected by water deficit in Amaranthus hypochondriacus L. and Amaranthus hybridus L
Krüger, Gert Hendrik Jacobus; Slabbert, Retha M. (Elsevier, 2011)The present study describes the behaviour of photosystem II (PSII) in Amaranthus hypochondriacus and Amaranthus hybridus under water stress conditions, assessed by the analyses of the polyphasic rise in chlorophyll a ... -
Effect of ozone on photosynthesis and seed yield of sensitive (S156) and resistant (R123) Phaseolus VulgarisL. genotypes in open-top chambers
Scheepers, Cornelius C.W.; Krüger, Gert H.J.; Strasser, Reto J. (Springer, 2013)Rising tropospheric ozone (O3) concentrations have been identified as a significant threat to crop production. In the present study two snap bean (Phaseolus vulgaris L.) genotypes with known difference in sensitivity to ... -
Experimental climate warming enforces seed dormancy in South African Proteaceae but seedling drought resilience exceeds summer drought periods
Arnolds, Judith L.; Krüger, Gert H.J.; Musil, Charles F.; Rebelo, Anthony G. (Springer, 2015)Two hypotheses—that elevated night-time temperatures due to climate warming would enforce post-fire dormancy of Proteaceae seed due to low moisture, and that periods without rain during summer would exceed desiccation ... -
Inhibition of photosystem II activities in soybean (Glycine max) genotypes differing in chilling sensitivity
Krüger, G.H.J.; De Villiers, M.F.; Strauss, A.J.; De Beer, M.; Van Heerden, P.D.R.; Strasser, R.J. (Elsevier, 2014)Due to chilling sensitivity, minimum night temperatures represent the main constraint in soybean production in South Africa. In vivo quantification of photosystem II (PSII) function by direct chlorophyll fluorescence ... -
Kontrasterende invloed van chroniese osoonblootstelling op fotosintetiese elektronoordrag en CO2-assimilering in gevoelige (S156) en bestande (R123) Phaseolus vulgaris L. genotipes
Krüger, Gert H. J.; Scheepers, Cornelius C.W.; Strasser, Reto J.; Berner, Jacques M. (Suid-Afrikaans Akademie vir Wetenskap en Kuns, 2018)Troposferiese osoon (O3) word beskou as een van die belangrikste lugbesoedelstowwe aangesien dit wêreldwyd meer skade aan landbougewasse aanrig as al die ander besoedelstowwe saam. Weens die oksiderende aard daarvan ... -
Open-top chambers to study air pollution impacts in South Africa. Part I: microclimate in open-top chambers
Heyneke, E.; Smit, P.R.; Van Rensburg, L.; Krüger, G.H.J. (Taylor & Francis, 2012)South Africa’s large industrial growth has created an obvious need to extend, improve and evaluate air pollution impacts on plants in order to assess present-day and future impacts of air pollutants on crop yields. In ... -
Opportunistic survival strategy of Welwitschia mirabilis : recent anatomical and ecophysiological studies elucidating stomatal behaviour and photosynthetic potential
Krüger, G.H.J.; Jordaan, A.; Tiedt, L.R.; Strasser, R.J.; Berner, J.M. (Canadian Science Publishing, 2017)We present new findings on leaf and stomatal apparatus anatomy and ecophysiology of Welwitschia mirabilis Hook.f. that are relevant to survival in the desert. We show that the structure of the stomatal apparatus with ... -
SO2-drought interaction on crop yield, photosynthesis and symbiotic nitrogen fixation in soybean (Glycine max)
Heyneke, E.; Strauss, A.J.; Van Heerden, P.D.R.; Krüger, G.H.J.; Strasser, R.J. (Springer, 2013)South Africa has an energy-intensive economy, resulting in substantial SO2 pollution. Well watered and drought stressed soybean (Glycine max) were exposed to SO2 in open-top chambers to study the physiology of SO2 injury ...