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dc.contributor.author Moseki, B.
dc.contributor.author Dintwe, K.
dc.date.accessioned 2011-12-06T12:30:19Z
dc.date.available 2011-12-06T12:30:19Z
dc.date.issued 2011
dc.identifier.citation Moseki, B. & Dintwe, K. (2011) Effect of water stress on photosynthetic characteristics of two sorghum cultivars, The African Journal of Plant Science and Biotechnology, pp. 89-91 en_US
dc.identifier.issn 1752-3931 (Print)
dc.identifier.uri http://hdl.handle.net/10311/962
dc.description.abstract The effects of water stress on the photosynthetic characteristics of two locally-cultivated sorghum cultivars (‘Segaolane’ and ‘Town’) were investigated over a period of weeks. Water stress was imposed on 1-week-old plants by withholding water. Measurements of chlorophyll fluorescence were used to determine changes in the efficiency of light utilization for electron transport, the occurrence of photoinhibition of photosystem II photochemistry on the sorghum cultivars. Drought treatment significantly decreased leaf area in all species, an important factor in drought-induced decreases in photosynthetic productivity. Water-stressed ‘Town’ exhibited a decrease in maximum photochemical efficiency of PSII (estimated from dark-adapted Fν⁄Fм ratio) with increasing period of withholding water. Light-adapted Fν’⁄Fм’ estimated the efficiency of excitation energy transfer to open PSII centres. Water-stressed ‘Town’ displayed a decrease in the efficiency of excitation energy transfer to open PSII reaction centres throughout the entire study period. The quantum yield of PSII electron transport (фPSII), which represents electron flow beyond PSII, decreased markedly in water-stressed ‘Town’ compared with that of water-stressed ‘Segaolane’. These initial findings indicate that ‘Town’ is more prone to photoinhibition than ‘Segaolane’. en_US
dc.language.iso en en_US
dc.publisher Global Science Books, http://www.globalsciencebooks.info/ en_US
dc.subject Chlorophyll fluorescence en_US
dc.subject Dark-adapted Fν/Fm en_US
dc.subject Photoinhibition en_US
dc.subject 'Segaolane' en_US
dc.subject 'Town' en_US
dc.title Effect of water stress on photosynthetic characteristics of two sorghum cultivars en_US
dc.type Published Article en_US


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