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<p>Declining wheat productivity in South Asia has been more conspicuous in the recent years due to increases in temperature from late February onwards thereby exposing the crop to terminal heat stress. This necessitates the adoption of effective strategies including growing heat-tolerant cultivars or managing inputs such as water and fertilizer. We conducted a field study to understand whether the additional nitrogen (N) levels can improve yield stability under terminal heat stress in wheat crop. A total of 13 genotypes were grown with six N levels (N0 to N300) and three sowing dates (to impose varying heat stress) across two growing seasons. The traits like grain yield (kg m<sup>− 2</sup>), spike weight (g), thousand grain weight (g), and productive tillers were assessed for stability. We used additive main effects and multiplicative interaction (AMMI) and genotype main effect plus genotype-by-environment interaction (GGE) and identified HD2967, C306, and HD2781 as key stable genotypes across diverse environmental conditions. Further, multi-trait stability index (MTSI) analysis confirmed HD2967 and C306 as the most stable and superior genotypes in terms of overall performance. High N levels (additional 60&#xa0;kg ha<sup>− 1</sup> to 120&#xa0;kg ha<sup>− 1</sup>) were found to be the most favourable for genotypes exposed to terminal heat stress under late sown conditions, while for early sown crop, moderate N was the optimal dose. Thus, we identified heat-stable wheat genotypes and demonstrated that additional N fertilization is a necessary adaptive strategy to mitigate the adverse effects of terminal heat stress and sustain productivity.</p>

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Multi-environment stability analysis identifies wheat genotypes tolerant to terminal heat stress under varied nitrogen regimes

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • G. Andonissamy Daniel,
  • Lukram Shantikumar,
  • Sandeep Sharma,
  • Tripti Tomar,
  • Aman Khan,
  • Revanth Ragul Arivanandham,
  • Harikrishna,
  • Anjali Anand,
  • Alison R. Bentley,
  • Matthew P. Reynolds,
  • Renu Pandey

摘要

Declining wheat productivity in South Asia has been more conspicuous in the recent years due to increases in temperature from late February onwards thereby exposing the crop to terminal heat stress. This necessitates the adoption of effective strategies including growing heat-tolerant cultivars or managing inputs such as water and fertilizer. We conducted a field study to understand whether the additional nitrogen (N) levels can improve yield stability under terminal heat stress in wheat crop. A total of 13 genotypes were grown with six N levels (N0 to N300) and three sowing dates (to impose varying heat stress) across two growing seasons. The traits like grain yield (kg m− 2), spike weight (g), thousand grain weight (g), and productive tillers were assessed for stability. We used additive main effects and multiplicative interaction (AMMI) and genotype main effect plus genotype-by-environment interaction (GGE) and identified HD2967, C306, and HD2781 as key stable genotypes across diverse environmental conditions. Further, multi-trait stability index (MTSI) analysis confirmed HD2967 and C306 as the most stable and superior genotypes in terms of overall performance. High N levels (additional 60 kg ha− 1 to 120 kg ha− 1) were found to be the most favourable for genotypes exposed to terminal heat stress under late sown conditions, while for early sown crop, moderate N was the optimal dose. Thus, we identified heat-stable wheat genotypes and demonstrated that additional N fertilization is a necessary adaptive strategy to mitigate the adverse effects of terminal heat stress and sustain productivity.