Author(s):

P Bhasker, AS Nandwal, N Kumar, G Chand, K Kumar and S Kumar

Abstract: Chickpea (Cicer arietinum L.) is an important food crop grown in India under rainfed conditions. The crop usually encounters terminal high temperature (HT) during pod filling stage. The objective of the work is to determine the degree of HT effect on two contrast genotypes viz. ICCV 92944 and HC 5 differing in their tolerance detectable from net photosynthesis (P_N), stomatal conductance (g_s), SPAD, chlorophyll stability index (CSI), photochemical efficiency of PSII measured as chlorophyll fluorescence (CF) and canopy temperature depression (CTD) under field condition. HT was applied by the changing of two sowing dates i.e. normal and late sown. With increasing days after exposure to HT a close relationship in decline photosynthesis, chlorophyll content and CTD was observed. In comparison to HC 5, ICCV 92944 exhibited the better chlorophyll content, photosynthetic activity and yield, the variance of different parameters statistically related to yield decrease. The measured parameters of ICCV 92944 (identified as HT tolerant), declined relatively more slowly than those of HC 5. Results showed that HT induced stress is detectable from P_N, g_s, SPAD, CSI, CF and CTD, these physiological non-invasive techniques shown correlated with yield and all can be useful tools to help in screening of chickpea germplasm for HT tolerance.

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