Author(s):

Ubale Sonali P, PN Rasal, Jakku Prasanna and Waghmare PS

Abstract: Heat stress is one of the major limitations in wheat (Triticum aestivum L.) productivity in arid, semiarid, tropical and semi tropical regions of world. Wheat is grown as winter cereal crop in subtropical countries like India. The crop experiences chronic high temperature at most of phenological stages of growth. The present study was undertaken to identify heat tolerant wheat genotypes based on their response for days to flowering and days to maturity in normal, late and very late sown condition. A set of 20 wheat genotypes was evaluated with split plot design under normal, late and very late sowing conditions by altering sowing dates. Data analysis revealed that sowing time and genotype has significant effect on traits like days to flowering and days to maturity. Based on the time taken by the genotypes to flower and mature under late sowing and very late sowing conditions, six genotypes showing heat tolerance were found to be resistant. Heat susceptibility index value was used to identify genotypes as tolerant to heat for various traits. The genotypes identified as heat tolerant would form an important resource for the development of high-yielding varieties under heat stress.

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