Identification and Evaluation of Thermotolerance in Broccoli Seedlings Based on a Multi-Trait Phenotyping System

文献类型： 外文期刊

第一作者： Li, Xuaner

作者： Li, Xuaner;Zhao, Yongyu;Xu, Tiemin;Feng, Xigang;Han, Fengqing;Wen, Dongna;Liu, Yumei;Gao, Wenzheng;Li, Zhansheng;Xu, Tiemin;Feng, Xigang;Zhao, Zhiwei

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关键词： broccoli; heat tolerance; physiological indicator; electrical conductivity; seeding

期刊名称：BIOLOGY-BASEL （ 影响因子：3.5； 五年影响因子：4.0 ）

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年卷期： 2025 年 14 卷 8 期

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收录情况： SCI

摘要： To establish a systematic approach for evaluating heat tolerance at the seedling stage in broccoli, we investigated 14 representative cultivars cultivated in China. Physiological indicators' such as electrical conductivity, malondialdehyde, proline, and chlorophyll content were measured before and after heat stress, alongside phenotypic scoring of heat injury, to characterize the differential thermotolerance among genotypes. The results indicated that significant differences (p< 0.05) in heat tolerance at the seedling stage were observed among different broccoli cultivars after heat stress treatment at 40 degrees C. Among them, Yanxiuexhibited the strongest heat tolerance, followed by Meiqing, Naihanyouxiu, Meiao 7172,Feicui 5, Guowang 11, Zheqing 80, Zhongqing 15, Zhongqing 318, Zhongqing 319, andQianghan. Lvxiong 90, Zhongqing 11, and Zhongqing 16 were the least heat tolerant. Pearson's correlation analysis demonstrated that the seedling heat tolerance of different broccoli cultivars was significantly negatively correlated with electrical conductivity, with a correlation coefficient of 0.542 (p< 0.05). In this study, a rapid and robust method for determining the heat resistance response of broccoli was established, providing a scientific basis and technical support for the identification of the heat resistance of new broccoli cultivars and the selection and breeding of heat-tolerant cultivars in China

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