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<p>Field pea is an important cool-season legume that often exposed to terminal high temperatures under late-sown conditions. Sensor-guided measurements of chlorophyll (CHL), flavonoids (FLAV), anthocyanins (ANTH), and nitrogen balance index (NBI) across varying temperature regimes provide valuable insights into plant adaptive responses. This study aimed to assess genotypic variability and pigment dynamics in field pea under three sowing conditions—timely-sown (NSE), late-sown (27&#xa0;days, LSE-I), very late-sown (54&#xa0;days, LSE-II)—to assess the significance of plant pigments in ensuring yield stability under high-temperature stress. Late-sown conditions (LSE-I, LSE-II) exposed crops to elevated temperatures during flowering (+ 2.5 to 4.0&#xa0;°C) and reproductive phases (+ 4.9 to + 6.4&#xa0;°C) compared to NSE. Notably, late-sown crops exhibited higher CHL (25–39%) and NBI (32–46%) during pod development compared to NSE, while prominent decline in CHL and NBI from flowering to pod development was observed only in NSE and LSE-I. Changes in FLAV from flowering to pod development were positive under LSE-II (+ 8%) but negative under NSE (–12%). Biomass and plant height showed significant correlations with CHL during flowering. Stepwise regression revealed significant associations of FLAV and NBI with yield under high-temperature conditions. In general, high-temperature tolerant genotypes exhibited lower CHL and NBI values with reduced sensitivity of these indices to temperature fluctuations compared to susceptible genotypes. Significant genotypic variation was observed for pigment traits, and superior lines demonstrating higher ‘mean versus stability’ were identified. These findings underscore that sensor-derived estimations of leaf pigments could serve as valuable functional traits for enhancing heat tolerance in field pea.</p>

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High-Temperature Sensitivity of Plant Pigments and Their Significance in Breeding for Heat-Tolerant Field Pea (Pisum sativum L.)

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Ashok Kumar Parihar,
  • Kali Krishna Hazra,
  • Amrit Lamichaney,
  • Abhishek Bohra,
  • Anil Kumar Singh,
  • Raj Kumar Mishra,
  • Anup Chandra,
  • Ummed Singh,
  • Girish Prasad Dixit

摘要

Field pea is an important cool-season legume that often exposed to terminal high temperatures under late-sown conditions. Sensor-guided measurements of chlorophyll (CHL), flavonoids (FLAV), anthocyanins (ANTH), and nitrogen balance index (NBI) across varying temperature regimes provide valuable insights into plant adaptive responses. This study aimed to assess genotypic variability and pigment dynamics in field pea under three sowing conditions—timely-sown (NSE), late-sown (27 days, LSE-I), very late-sown (54 days, LSE-II)—to assess the significance of plant pigments in ensuring yield stability under high-temperature stress. Late-sown conditions (LSE-I, LSE-II) exposed crops to elevated temperatures during flowering (+ 2.5 to 4.0 °C) and reproductive phases (+ 4.9 to + 6.4 °C) compared to NSE. Notably, late-sown crops exhibited higher CHL (25–39%) and NBI (32–46%) during pod development compared to NSE, while prominent decline in CHL and NBI from flowering to pod development was observed only in NSE and LSE-I. Changes in FLAV from flowering to pod development were positive under LSE-II (+ 8%) but negative under NSE (–12%). Biomass and plant height showed significant correlations with CHL during flowering. Stepwise regression revealed significant associations of FLAV and NBI with yield under high-temperature conditions. In general, high-temperature tolerant genotypes exhibited lower CHL and NBI values with reduced sensitivity of these indices to temperature fluctuations compared to susceptible genotypes. Significant genotypic variation was observed for pigment traits, and superior lines demonstrating higher ‘mean versus stability’ were identified. These findings underscore that sensor-derived estimations of leaf pigments could serve as valuable functional traits for enhancing heat tolerance in field pea.