Use of Heat Susceptibility Index and Heat Response Index as a Measure of Heat Tolerance in Wheat and Triticale
2018
Suresh, Suresh | Bıshnoı, Om Parkash | Behl, Rishi Kumar
Wheat, a cool temperature-loving crop is encountering serious problem of high temperature particularly at the grainfilling stage. The present investigation was carried out to compare wheat and triticale genotypes for heat tolerance usingseven genotypes from each group. This experiment was conducted in randomized block design with three replicationsunder two dates of showing i.e. 25th November and 25th December. Morphological traits like days to flowering, daysto maturity, spike length, number of effective tillers per plant, grain yield per plant, biological yield per plant, harvestindex and thousand grain-weight were studied and used for the calculation of heat susceptibility index (HSI). In wheatgroup wherein, genotypes Raj 3765, WH 1080 and WH 1142 showed minimum HSI; while in triticale group, almost allgenotypes 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 supportedby correlation analysis in which HSI and HRI were negatively correlated with each other.
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