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<p>Heat stress affects adversely wheat crop production through many factors, which interfere with the normal biochemical activities. An experiment was undertaken to assess the impact of heat stress on wheat genotypes. The experimental material was planted in two different conditions viz., control (irrigated timely sown) and heat stress (irrigated late sown) at two different locations in Haryana for two consecutive years. The analysis of variance indicated significant differences among genotypes for most traits in both environments. Heat stress largely affected all the traits but highest reduction was recorded in grain filing duration followed by days to heading, maturity, grains/spike and grain yield whereas minimum reduction was recorded for thousand grains weight. The canopy temperature showed an increase under heat stress as compared to control condition. High phenotypic variation was observed for all traits under both timely and heat stress conditions over the years, with varying levels of heritability and genetic advance. Different stress indices viz., stress susceptible susceptibility index (SSI), stress tolerance index (STI), geometric mean productivity (GMP), mean productivity (MP) were used to identify tolerant genotypes. Genotypes PBW343 and NW1014 were found to be high performers under stress and normal conditions. Genotypes Raj4083 and Raj4079 were found to be heat tolerant based on SSI and TOL. Based on STI genotypes PBW550, PBW343 and UP2338 were found to be heat tolerant and high performers under both stress and normal conditions thus ideal candidates for their use in breeding programs targeting yield improvement under stress conditions.</p>

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Characterizing wheat genotypes for heat stress tolerance based on morpho-physiological traits and stress tolerance indices

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Amandeep Kaur,
  • Somveer Nimbal,
  • Renu Munjal,
  • Pradeep Sharma,
  • O. P. Ahlawat,
  • Ratan Tiwari,
  • Vishnu Kumar,
  • Sanjay Kumar Singh,
  • Vikas Gupta

摘要

Heat stress affects adversely wheat crop production through many factors, which interfere with the normal biochemical activities. An experiment was undertaken to assess the impact of heat stress on wheat genotypes. The experimental material was planted in two different conditions viz., control (irrigated timely sown) and heat stress (irrigated late sown) at two different locations in Haryana for two consecutive years. The analysis of variance indicated significant differences among genotypes for most traits in both environments. Heat stress largely affected all the traits but highest reduction was recorded in grain filing duration followed by days to heading, maturity, grains/spike and grain yield whereas minimum reduction was recorded for thousand grains weight. The canopy temperature showed an increase under heat stress as compared to control condition. High phenotypic variation was observed for all traits under both timely and heat stress conditions over the years, with varying levels of heritability and genetic advance. Different stress indices viz., stress susceptible susceptibility index (SSI), stress tolerance index (STI), geometric mean productivity (GMP), mean productivity (MP) were used to identify tolerant genotypes. Genotypes PBW343 and NW1014 were found to be high performers under stress and normal conditions. Genotypes Raj4083 and Raj4079 were found to be heat tolerant based on SSI and TOL. Based on STI genotypes PBW550, PBW343 and UP2338 were found to be heat tolerant and high performers under both stress and normal conditions thus ideal candidates for their use in breeding programs targeting yield improvement under stress conditions.