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<p>Carrot (<i>Daucus carota</i> L.) is widely known for its nutritional composition but its growth and development are severely affected by heat stress. The study was executed to identify the mechanisms underlying the carrot plants’ ability to tolerate heat stress to mitigate challenges imposed by climate change. Eight carrot genotypes including PC-100, PC-ABR, PC-CPUR and, PC-DJAL (tolerant) and PC-163, Desi Red, CCJ-2 and, PC-172 (sensitive) were grown under early (heat stress) and main (control) conditions. PC-100 demonstrated heat tolerance in terms of yield and yield-contributing traits in the field, followed by PC-DJAL, PC-ABR, and PC-CPUR. Genotypes PC-CPUR and PC-100 depicted highest chlorophyll content during both the seasons. Superoxide dismutase (SOD) was found to be maximum in the roots and leaves of PC-100 during both the seasons. Heat stress activated Asada-Halliwell pathway in PC-100, PC-CPUR, and PC-ABR revealing higher activities of ascorbate peroxidase (APX) and glutathione reductase (GR) alongwith higher Reduced/Oxidised glutathione content (GSH/GSSG ratio). These genotypes were negatively correlated with Hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) content while showed positive correlation with carrot yield. PC-ABR, another tolerant genotype depicted more than 2.2 folds increase in CAT activity during heat stress. PC-100, PC-ABR, PC-CPUR and PC-DJAL showed higher proline and glycine betaine contents during both seasons. These carrot genotypes displaying tolerant behaviour in response to heat stress may be exploited by plant breeders to develop improved thermotolerant varieties.</p>

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Heat-stress induced changes in morphological and biochemical parameters of carrot (Daucus carota L.) genotypes

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Kamaljeet Kaur,
  • Ruma Devi,
  • Tarsem Singh Dhillon,
  • Rachana D. Bhardwaj

摘要

Carrot (Daucus carota L.) is widely known for its nutritional composition but its growth and development are severely affected by heat stress. The study was executed to identify the mechanisms underlying the carrot plants’ ability to tolerate heat stress to mitigate challenges imposed by climate change. Eight carrot genotypes including PC-100, PC-ABR, PC-CPUR and, PC-DJAL (tolerant) and PC-163, Desi Red, CCJ-2 and, PC-172 (sensitive) were grown under early (heat stress) and main (control) conditions. PC-100 demonstrated heat tolerance in terms of yield and yield-contributing traits in the field, followed by PC-DJAL, PC-ABR, and PC-CPUR. Genotypes PC-CPUR and PC-100 depicted highest chlorophyll content during both the seasons. Superoxide dismutase (SOD) was found to be maximum in the roots and leaves of PC-100 during both the seasons. Heat stress activated Asada-Halliwell pathway in PC-100, PC-CPUR, and PC-ABR revealing higher activities of ascorbate peroxidase (APX) and glutathione reductase (GR) alongwith higher Reduced/Oxidised glutathione content (GSH/GSSG ratio). These genotypes were negatively correlated with Hydrogen peroxide (H2O2) content while showed positive correlation with carrot yield. PC-ABR, another tolerant genotype depicted more than 2.2 folds increase in CAT activity during heat stress. PC-100, PC-ABR, PC-CPUR and PC-DJAL showed higher proline and glycine betaine contents during both seasons. These carrot genotypes displaying tolerant behaviour in response to heat stress may be exploited by plant breeders to develop improved thermotolerant varieties.