Abstract
Temperature stress is one of the major limitations to crop productivity worldwide. Identifying suitable screening indices and quantifiable traits would facilitate the crop improvement process for high temperature tolerance. The objective of the present study was to screen and to identify temperature tolerant Brassica genotypes on the basis of physiological parameters viz. relative water content (RWC), total chlorophyll content, membrane stability index (MSI), total carotenoid content and yield. Fifteen Brassica juncea genotypes subjected to temperature stress by growing the crops at three dates of sowing i.e. 15th October (D1), 1st November (D2) and 15th November (D3); showed decrease in RWC, MSI and chlorophyll content at D2 and D3 sowings compared to the D1. Genotypes like Proagro, NDR 8801 and CS-52 showed lower decline in MSI, RWC, chlorophyll and carotenoid content in leaves and seed yield/plant, while Pusa Agrani, EJ-15 and Pusa Tarak showed comparatively greater decline in the above parameters. The results suggest that physiological parameters like MSI, RWC and chlorophyll and carotenoid contents can be used as simple indices for screening and identifying temperature stress tolerant genotypes.
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