Suresh SURESH, Om Parkash BISHNOI, Rishi Kumar BEHL

Use of Heat Susceptibility Index and Heat Response Index as a Measure of Heat Tolerance in Wheat and Triticale

Wheat, a cool temperature-loving crop is encountering serious problem of high temperature particularly at the grain filling stage. The present investigation was carried out to compare wheat and triticale genotypes for heat tolerance using seven genotypes from each group. This experiment was conducted in randomized block design with three replications under two dates of showing i.e. 25th November and 25th December. Morphological traits like days to flowering, days to maturity, spike length, number of effective tillers per plant, grain yield per plant, biological yield per plant, harvest index and thousand grain-weight were studied and used for the calculation of heat susceptibility index (HSI). In wheat group wherein, genotypes Raj 3765, WH 1080 and WH 1142 showed minimum HSI; while in triticale group, almost all genotypes had minimum values of HSI for different traits, representing high temperature tolerance of these genotypes. Based on heat response index (HRI) also same results were revealed. Overall genotypes Raj 3765, WH 1142, TL 3001, TL 3002, TL 3005 and TL 2942 figured most suitable for late sown conditions. Further these results were also supported by correlation analysis in which HSI and HRI were negatively correlated with each other.

Keywords:

wheat, triticale heat stress, HSI, HRI,

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