Chlorophyll and carotenoid content of wheat (Triticum aestivum L.) seedlings under heat stress as affected by trehalose application
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Abstract
Presently, chlorophyll and carotenoid contents were evaluated under control (25±2°C), heat stress (35±2°C and 40±2°C) and interactive effect of heat stress and trehalose in six wheat (Triticum aestivum L.) genotypes (HD2967, PBW175, C306, PBW343, PBW621 and PBW590). Trehalose an osmoprotectant, at concen-tration of 1mM and 1.5mM was applied at 7 days after sowing (DAS) followed by heat stress of 35±2°C (moderate) and 40±2°C (severe) on 8DAS for 4 and8 hours. As chloroplast thylakoid membranes, are highly vulnerable to heat stress, the chlorophyll content decreased with increased temperature stress in all selected genotypes. Heat stress significantly reduced (P< 0.05) the carotenoid content in all genotypes. Severe heat stress (8 hours) more adversely affected these mentioned parameters. The application of Trehalose @ 1.5mM as compared with 1mM concentration was found more effective to ameliorate the adverse effect of heat stress on chlorophyll and carotenoid contents to sustain photosynthetic process.
Article Details
Article Details
Heat stress, Photosynthetic pigments, Trehalose, Wheat
40(1):17-22
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