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<p>Castor crop is known to be tolerant to moderate to high temperature but terminal drought stress accompanied by high temperature during reproductive phase affect its productivity. In this study, a set of promising drought-tolerant castor germplasm lines were evaluated under field conditions to assess their response to temperature variation by staggered sowings (November 2020 and January 2021). There was an increase of 2.7&#xa0;°C in mean temperature between both the sowings. Delayed sowing resulted in reduction in days to flowering, crop duration and seed yield (declined from 120&#xa0;g/plant in November to 84&#xa0;g/plant in January sowing). However, five genotypes (RG 72, RG 82, RG 298, RG 2048, and RG 2797) showed less than 10% yield reduction, indicating their resilience to higher temperature stress. On an average, seed yield decreased by 30% due to delayed sowing of the crop and regression analysis revealed an estimated 11% yield reduction for every 1&#xa0;°C increase in mean temperature. Notably, the anticipated yield loss may have been mitigated by unusually high rainfall during May 2021, which extended the crop’s duration and lowered maximum temperatures. This was reflected in the accumulated growing degree days (GDD), which increased from 834 to 1309 between the two sowing times (a difference of 476 GDD).</p>

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Evaluation of promising drought-tolerant castor genotypes under variable temperature environment

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • P. Lakshmamma,
  • Lakshmi Prayaga,
  • J. Jawaharlal,
  • K. Alivelu,
  • Ratnakumar Pasala

摘要

Castor crop is known to be tolerant to moderate to high temperature but terminal drought stress accompanied by high temperature during reproductive phase affect its productivity. In this study, a set of promising drought-tolerant castor germplasm lines were evaluated under field conditions to assess their response to temperature variation by staggered sowings (November 2020 and January 2021). There was an increase of 2.7 °C in mean temperature between both the sowings. Delayed sowing resulted in reduction in days to flowering, crop duration and seed yield (declined from 120 g/plant in November to 84 g/plant in January sowing). However, five genotypes (RG 72, RG 82, RG 298, RG 2048, and RG 2797) showed less than 10% yield reduction, indicating their resilience to higher temperature stress. On an average, seed yield decreased by 30% due to delayed sowing of the crop and regression analysis revealed an estimated 11% yield reduction for every 1 °C increase in mean temperature. Notably, the anticipated yield loss may have been mitigated by unusually high rainfall during May 2021, which extended the crop’s duration and lowered maximum temperatures. This was reflected in the accumulated growing degree days (GDD), which increased from 834 to 1309 between the two sowing times (a difference of 476 GDD).