The Molecular Plant Physiology group was established in 1998 when Professor Karl Kunert joined FABI. Since then the group has grown and is currently headed by Dr Juan Vorster. We collaborate with various groups from around the world, each brining unique specialities, to understand plant development and the response of plant towards stress. Using a multi-disciplinary approach we hope to obtain a holistic view of the changes in the plant under stress. On a genomic level we have studies stress induced mutations and rearrangements of the genome, we are also using transcriptomics to study and identify genes and pathways that are important during the stress response. On a protein level we are especially interested in the role cysteine proteases as well as cysteine protease inhibitors play during development and senescence. Here we make use of in silico protein modelling to study protein-protein interactions as well as to predict the effect of mutations on inhibitor binding. Through protein engineering and enzyme kinetics we then evaluate the effect of these changes on inhibitor strength and specificity. We also measure protease activity and changes in the REDOX state in different tissues and under different stress conditions. To complement the molecular data we also follow and characterize various physiological and phenotypic changes in the plants we study. The ultimate aim is to identify usable molecular, biochemical or phenotypic markers that can be used to develop plants better adapted to stress in a changing environment.
Molecular Plant Physiology
Mbedzi PP, Van den Hooven L, Vorster BJ , Van der Waals J. (2019) Screening for Sclerotinia sclerotiorum resistance using detached leaf assays and simple sequence repeat markers in soybean cultivars. Crop Protection 215:104909. 10.1016/j.cropro.2019.104909
Kibido T, Kunert K, Makgopa M, Greve M, Vorster BJ . (2019) Improvement of rhizobium‐soybean symbiosis and nitrogen fixation under drought. Food and Energy Security :e117. 10.1002/fes3.177
Juan Vorster, Chris Cullis, Karl Kunert. (2019) Plant Vacuolar Processing Enzymes. Frontiers in Plant Science :00497. 10.3389/fpls.2019.00479
Cullis C, Lawler DW, Chimwamurombe P, Kunert K, Bbebe N, Vorster J. (2019) Development of marama bean, an orphan legume, as a crop. Food and Energy Security e00164:1-12. 10.1002/fes3.164
NM Okumu, BJ Vorster, CF Reinhardt. (2019) Growth-stage and temperature influence glyphosate resistance in Conyza bonariensis (L.) Cronquist.. South African Journal of Botany 121:248-256. 10.1016/j.sajb.2018.10.034