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dc.contributor.authorEnnahli, Said
dc.date.accessioned2014-03-03T21:05:41Z
dc.date.available2014-03-03T21:05:41Z
dc.date.issued2003-12
dc.identifier.otherennahli_said_200312_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/ennahli_said_200312_ms
dc.identifier.urihttp://hdl.handle.net/10724/21278
dc.description.abstractA new type of chlorophyll fluorometer was evaluated, and a novel technique was developed for accurately estimating thylakoid electron transport rates with this instrument. Then, combined measurements of leaf gas exchange and chlorophyll fluorescence were used to investigate the effects of water stress on photosynthesis of cotton leaves. A computer-automated lysimeter was used to impose distinct levels of water stress on potted cotton plants. Under mild water stress, limitations to photosynthesis were entirely attributable to stomatal closure, which reduced leaf internal CO2 concentrations. Under moderate or severe water stress, non-stomatal limitations to photosynthesis were also observed; these were evident as a reduction in the net CO2 assimilation rate for a given CO2 concentration within the chloroplast. After re-watering severely water stressed plants, stomatal limitations to photosynthesis returned to control levels within 24 hours. However, non-stomatal limitations remained elevated even 48 hours after re-watering, indicating lasting injury to the photosynthetic apparatus.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectchlorophyll fluorescence
dc.subjectCO2 assimilation
dc.subjectcotton
dc.subjectdrought stress
dc.subjectGossypium hirsutum
dc.subjectlysimeter
dc.subjectphotorespiration
dc.subjectphotosynthesis
dc.subjectphotosystem II
dc.subjectstomatal limitation
dc.subjectthylakoid electron transport
dc.subjectwater stress
dc.titleComponent limitations to photosynthesis of cotton under drought stress
dc.typeThesis
dc.description.degreeMS
dc.description.departmentAgronomy
dc.description.majorAgronomy
dc.description.advisorHugh J Earl
dc.description.committeeHugh J Earl
dc.description.committeeMarc van Iersel
dc.description.committeeCraig Bednarz


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