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Regulation of photosynthesis, fluorescence, stomatal conductance and water-use efficiency of cowpea (Vigna unguiculata [L.] Walp.) under drought

Paper ID Volume ID Publish Year Pages File Format Full-Text
30772 44502 2011 11 PDF Available
Title
Regulation of photosynthesis, fluorescence, stomatal conductance and water-use efficiency of cowpea (Vigna unguiculata [L.] Walp.) under drought
Abstract

Drought is the major abiotic stress factor that causes extensive losses to agriculture production worldwide. The objective of this study was to evaluate the dynamics of photosynthesis and water-use efficiency parameters in 15 cowpea genotypes under well-watered and drought condition. Photosynthesis (A) and chlorophyll fluorescence (Fv′/Fm′) declined linearly with decreasing soil water content whereas intrinsic water-use efficiency (WUE) increased under drought stress, suggesting stomatal regulation was a major limitation to photosynthesis. However, under increasing drought conditions, increase in ratio of intercellular CO2 to ambient CO2 concentrations along with reduced WUE showed the role of non-stomatal limitation of photosynthesis. The resistant nature of Fv′/Fm′ and electron transport rate under drought appeared to be important mechanisms for photoinhibition protection under drought stress. Oxidative stress was apparent due to drought-induced reduction in total chlorophyll and carotenoid which was accompanied with increased leaf wax contents. The accumulation of proline appeared to be in response of drought injury rather than a drought tolerance mechanism. A clear separation based on the genotypes site of origin among the genotypes for drought tolerance could not be established when analyzed using principal component analysis. The identified genotypes and physiological traits from this study may be useful for genetic engineering and breeding programs integrating drought adaptation in cowpea.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Dynamics of photosynthesis and water-use efficiency parameters in 15 cowpea genotypes in response to drought is examined. ► Photosynthesis and chlorophyll fluorescence declined linearly with decreasing soil water content. ► Intrinsic water-use efficiency increased under drought stress. ► Stomatal regulation is a major limitation to photosynthesis under drought conditions in cowpea cultivars.

Keywords
Photorespiration; Photo-inhibition; Electron transport rate; Internal carbon dioxide; Principal component analysis
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Regulation of photosynthesis, fluorescence, stomatal conductance and water-use efficiency of cowpea (Vigna unguiculata [L.] Walp.) under drought
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 105, Issue 1, 5 October 2011, Pages 40–50
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us