Influence of water stress on leaf photosynthetic characteristics in wheat cultivars differing in their susceptibility to drought |
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Authors: | D. Subrahmanyam N. Subash A. Haris A. K. Sikka |
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Affiliation: | (1) ICAR Research Complex for Eastern Region, WALMI Complex, Phulwari Sharif, Patna, Bihar, 801 505, India |
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Abstract: | A gradual reduction in leaf water potential (Ψleaf), net photosynthetic rate (P N), stomatal conductance, and transpiration rate was observed in two drought tolerant (C 306 and K 8027) and two susceptible (RW 893 and 899) genotypes subjected to water stress. The extent of reduction was lower in K 8027 and C 306 and higher in RW 893 and RW 899. Rewatering the plants after 5 d of stress restored P N and other gas exchange traits in all four cultivars. Water stress had no significant effect on variable to maximum fluorescence ratio (Fv/Fm) indicating that water stress had no effect on primary photochemistry of photosystem 2 (PS2). However, water stress reduced the efficiency of excitation energy transfer (F′v/F′m) and the quantum yield of electron transport (ΦPS2). The reduction was more pronounced in susceptible cultivars. Water stress had no significant effect on photochemical quenching, however, the non-photochemical quenching increased by water stress. |
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Keywords: | chlorophyll fluorescence net photosynthetic rate stomatal conductance transpiration rate Triticum aestivum water potential |
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