Response of leaf water status, stomatal characteristics, photosynthesis and yield in black gram and green gram genotypes to soil water deficit
Bhaswatee Baroowa A , Nirmali Gogoi A B , Sreyashi Paul A and Kushal Kumar Baruah A
+ Author Affiliations
- Author Affiliations
A Department of Environmental Science, Tezpur University, Tezpur-784028, Assam, India.
B Corresponding author. Email: nirmali@tezu.ernet.in
Functional Plant Biology 42(10) 1010-1018 https://doi.org/10.1071/FP15135
Submitted: 18 May 2015 Accepted: 8 July 2015 Published: 7 August 2015
Abstract
Drought is one of the most important abiotic stresses constraining crop productivity worldwide. The objective of the present study was to investigate the differences in drought tolerance at leaf and stomatal level of black gram (genotypes: T9, KU 301, PU 19, USJD 113) and green gram (genotypes: Pratap, SG 21–5, SGC 16, TMB 37). Drought was applied for fifteen consecutive days at flowering stage (35 days after sowing). Mid-day leaf water potential (ΨL), leaf area, photosynthesis rate (PN), leaf chlorophyll, stomatal conductance (gs) and seed yield of drought- treated plants were calculated relative to those of well watered plants. Stomatal characteristics were observed in terms of stomatal frequency (SF) and stomatal aperture size (SA). Among the studied genotypes, T9 (black gram) and Pratap (green gram) proved their better tolerance capacity to drought by maintaining higher leaf area, ΨL, PN, leaf chlorophyll, gs and SA which contributed to better seed yield. Between the two crops, green gram appeared to be affected to a greater extent, as it experienced higher reduction in yield than black gram. A highly significant positive correlation (level 0.01) of seed yield was obtained with leaf area, ΨL, PN, leaf chlorophyll, gs and SA, whereas SF was found to be poorly correlated with seed yield.
Additional keywords: leaf area, leaf water potential, photosynthesis, stomatal aperture size, stomatal conductance, stomatal frequency.
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