Use of multiple stress indices as a measure of heat tolerance in wheat accessions

Wheat is a crop of global significance, grown in diversified environments. Heat stress affects number morpho-physiological traits crops including wheat. A set 40 wheat accessions along with four checks were screened for heat tolerance based on various indices. The present study was undertaken during rabi 2018-19 randomized block design having three replications at CCS Haryana Agricultural University, Hisar under two dates sowing i.e. 24 th November and December . Significant variance observed among genotypes HSI all the except plant height spike length. Based TOL, DT 126, 46, 142, 102 124 found to be most tolerant stress, whereas basis HRI, HTI, MP GMP, promising identified 116, 101, 181, WH 1124, HD 3059 DT190. as would form an important resource development high yielding varieties condition. Correlation coefficients different revealed significant positive association grain yield per biological plant, harvest index, NDVI 1, tillers 1000 weight, denoting that these can used effectively, selection genotypes. Grain positively correlated indices viz ., GMP while, negatively TOL recognized paramount identifying cultivars stress.