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<p>Heat stress poses a global challenge to wheat production, necessitating the integration of physio-biochemical and gaseous exchange traits in wheat breeding for sustaining yield production. This study aimed to evaluate the performance of different physio-biochemical traits, their association with grain yield and their yield prediction capacity under heat stressed conditions. An alpha lattice design (ALD) experiment was conducted at CCSHAU, Hisar, with 200 bread wheat RILs under yield potential and heat stressed conditions during 2018–2019. Multispectral indices, physiological, biochemical, and gaseous exchange parameters were recorded at either anthesis or 15&#xa0;days post-anthesis, followed by statistical analysis. Positive correlations were observed between grain yield per plot and traits such as normalized difference vegetation index (NDVI), SPAD chlorophyll units, relative water content (RWC), canopy temperature depression (CTD), stomatal conductance (gs), and photosynthetic rate (A). Conversely, malondialdehyde content (MDA) exhibited a negative association. NDVI 1, gs, total antioxidant activity (TAA) and intrinsic water use efficiency (WUEi) were directly involved in sustaining yield production, whereas carboxylation capacity (Cc), WUEi and WUE (instantaneous) were indirectly involved via photosynthetic rate. RWC, TAA, CTD and SPAD measured at anthesis stage predicted over 33% and 29% of GYP variations in multiple and stepwise regression models respectively. NDVI, gs, A, WUE, Cc and WUEi explained 24% of variance with PC-1 labeled as heat resilience component. The preliminary results were promising and emphasized the potential role of physio-biochemical traits for harnessing heat tolerance. RILs 78 and 194 can be moved further for heat tolerance wheat breeding programs. NDVI 1, RWC and TAA followed by SPAD 1 can be considered as reliable parameters for selecting heat tolerant genotypes, though multi-year validation is necessary.</p>

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Evaluation of physio-biochemical traits in bread wheat RILs for terminal heat stress

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Mandeep Redhu,
  • Vikram Singh,
  • Anita Kumari,
  • Renu Munjal,
  • Somveer Nimbal,
  • Ram Niwas,
  • Shikha Yashveer,
  • Swati Verma,
  • Sonu Langaya,
  • Suman Devi,
  • Mehdi Rahimi

摘要

Heat stress poses a global challenge to wheat production, necessitating the integration of physio-biochemical and gaseous exchange traits in wheat breeding for sustaining yield production. This study aimed to evaluate the performance of different physio-biochemical traits, their association with grain yield and their yield prediction capacity under heat stressed conditions. An alpha lattice design (ALD) experiment was conducted at CCSHAU, Hisar, with 200 bread wheat RILs under yield potential and heat stressed conditions during 2018–2019. Multispectral indices, physiological, biochemical, and gaseous exchange parameters were recorded at either anthesis or 15 days post-anthesis, followed by statistical analysis. Positive correlations were observed between grain yield per plot and traits such as normalized difference vegetation index (NDVI), SPAD chlorophyll units, relative water content (RWC), canopy temperature depression (CTD), stomatal conductance (gs), and photosynthetic rate (A). Conversely, malondialdehyde content (MDA) exhibited a negative association. NDVI 1, gs, total antioxidant activity (TAA) and intrinsic water use efficiency (WUEi) were directly involved in sustaining yield production, whereas carboxylation capacity (Cc), WUEi and WUE (instantaneous) were indirectly involved via photosynthetic rate. RWC, TAA, CTD and SPAD measured at anthesis stage predicted over 33% and 29% of GYP variations in multiple and stepwise regression models respectively. NDVI, gs, A, WUE, Cc and WUEi explained 24% of variance with PC-1 labeled as heat resilience component. The preliminary results were promising and emphasized the potential role of physio-biochemical traits for harnessing heat tolerance. RILs 78 and 194 can be moved further for heat tolerance wheat breeding programs. NDVI 1, RWC and TAA followed by SPAD 1 can be considered as reliable parameters for selecting heat tolerant genotypes, though multi-year validation is necessary.