Identification of heat tolerance and screening of heat tolerance indexes in different Chinese cabbage seedlings

作者：Qiling Shi, Zijun Liu, Wanze Gao, Jing-Sen Yan, Shuai Yuan, Hao Liang, Xiaomeng Zhang, Yin Lu, Shuxing Shen, Jianjun Zhao, Wei Ma, Xiaoxue Sun · 发表于：Scientia Horticulturae · 年份：2023 · DOI：10.1016/j.scienta.2023.112381 · 被引用次数：14 · 研究领域：Greenhouse Technology and Climate Control、Plant responses to elevated CO2、Postharvest Quality and Shelf Life Management

Under the trends of global warming, the high and stable yield of Chinese cabbage has been affected by high temperature and heat damage. Establishing a simple, convenient, effective, and replicable heat tolerance evaluation model for Chinese cabbage is the key to screening and innovating of heat tolerance germplasm resources and to developing new Chinese cabbage varieties. In this experiment, 31 Chinese cabbage varieties were used as experimental materials. By experimentation with normal and artificially high (40 °C) temperatures, 12 seedling physiological indexes were determined. Based on the heat resistance coefficient (y) of every index, the heat resistance of different fast-growing Chinese cabbage varieties was comprehensively evaluated with multivariate analysis. The results showed that high-temperature stress had different effects on each index, and that the correlation between candidate indexes exhibited information overlap and a cross phenomenon. Principal component analysis transformed 12 single indexes of Chinese cabbage seedlings under high-temperature stress into 2 independent comprehensive indexes and generated the comprehensive evaluation value (D value) of heat tolerance for different varieties. On this basis, the evaluation equation for heat resistance in Chinese cabbage was established with the stepwise regression method. Cluster analysis enabled the classification of 31 Chinese cabbage varieties into four categories: extremely heat-resistant, moderately heat ...