Physiological and biochemical responses to cold stress in sesame (Sesamum indicum L.) during the early growth stage

文献类型： 外文期刊

第一作者： Abbas, Ahmed A.

作者： Abbas, Ahmed A.;Berhe, Muez;Kefale, Habtamu;Zhou, Rong;Zhou, Ting;Li, Huan;Zhang, Yanxin;You, Jun;Wang, Linhai;Abbas, Ahmed A.;Hussien, Somaya A.;Berhe, Muez;Kefale, Habtamu;Guan, Zhongbo;Ojiewo, Chris O.

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关键词： colder climate; low temperature stress; oilseed crop; seed germination; soluble protein

期刊名称：PLANT SOIL AND ENVIRONMENT （ 影响因子：1.8； 五年影响因子：2.2 ）

ISSN： 1214-1178

年卷期： 2025 年 71 卷 5 期

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收录情况： SCI

摘要： Cold stress significantly impacts sesame during its early growth stages, with varying responses observed among different genotypes. Ten genotypes were evaluated for phenotypic response to various temperatures during germination. Cold stress at 10, 12, 14, and 16 degrees C inhibited germination, with zero germination at 10 degrees C. At 14 degrees C, genotypes showed significant germination variation, and it was selected as the threshold temperature for assessing cold tolerance in sesame. Four genotypes were grouped into two, and each group with extreme germination responses (high and low) were selected for further biochemical and physiological studies. Genotypes V5 and V7 exhibited higher cold tolerance, better germination percentage, and seedling parameters under low temperatures, while V8 and V9 showed significant reductions, indicating cold sensitivity. Biochemical analyses revealed that cold-tolerant genotypes had enhanced activities of antioxidant enzymes, including catalase, superoxide dismutase, and peroxidase, as well as higher proline accumulation compared to sensitive genotypes. These antioxidants played a crucial role in mitigating the oxidative stress induced by cold, as evidenced by lower levels of hydrogen peroxide and malondialdehyde in the tolerant genotypes. Cold-tolerant genotypes also accumulated higher soluble sugars and protein levels, contributing to osmotic regulation and membrane stability. The findings highlight the importance of enzymatic and non-enzymatic antioxidants in cold stress tolerance, suggesting these biochemical markers could be used to identify and develop coldresistant sesame cultivars. The results offer valuable insights into the mechanisms underlying cold tolerance and provide a foundation for breeding efforts to improve sesame cold resistance.

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