Author(s):

Jyoti Chauhan, JP Srivastav and Basant Kumar Dadrwal

Abstract: Investigation entitled “Physiological and biochemical responses associated with terminal heat stress tolerance in Indian mustard (Brassica juncea (L.) Czern & Coss.) genotypes” was carried out during rabi 2017-18 to investigate the effect of delay in sowing on morphological, physiological, and phenological parameters of mustard affecting yield and yield attributes. Five genotypes of mustard viz. Pusa mustard 25 (V₁), Pusa mustard 26 (V₂), BPR-541-4 (V₃), RH-406 (V₄) and Urvashi (V₅) were sown in field on October 30 (normal sown; S₁), November 18 (late sown; S₂) and November 30 (very late sown; S₃) conditions under recommended package of practices. Data pertaining to different parameters were collected at regular intervals. It was observed that leaf number plant^-1, leaf area plant^-1 and leaf dry weight plant^-1 of mustard genotypes was the maximum when sown on November 15 (S₂). These parameters decreased significantly when sowing was done on November 30 (S₃). These parameters, though as compared to S₂ were lower in S₁, but differences in normal (S₁) and late (S₂) sowings were marginal. Specific leaf area (SLA), specific leaf weight (SLW), leaf area index (LAI) and leaf area ratio (LAR)) indicated that specific leaf area (SLA) and leaf area ration (LAR) at 30 DAS was the maximum and gradually declined till maturity, specific leaf weight (SLW) was the maximum at 90 DAS while leaf area index (LAI) was the maximum in at 60 DAS.

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