Drought Tolerance Evaluation and Verification of Fifty Pakchoi (Brassica rapa ssp. chinensis) Varieties under Water Deficit Condition

作者：Jingrui Li, Kumail Abbas, Weihong Wang, Binbin Gong, Lin Wang, Shenglin Hou, Hui Xia, Xiaolei Wu, Li‐Da Chen, Hongbo Gao · 发表于：Agronomy · 年份：2023 · DOI：10.3390/agronomy13082087 · 被引用次数：17 · 研究领域：Plant Stress Responses and Tolerance、Rice Cultivation and Yield Improvement、Plant Micronutrient Interactions and Effects

Reduced available water resources have become the main limiting factor for the production of leafy vegetable, such as pakchoi, which can be effectively addressed by growing water-efficient varieties. Therefore, it is particularly important for evaluation and verification of drought tolerant varieties. In this study, 50 different varieties of pakchoi were detected for their morphological and physiological indicators under both normal-irrigated and water-deficiency environments. Based on systematic analysis of these evaluation indicators using different evaluation methods, the significant indicators were identified and the prediction model was established followed by validation of different drought tolerant of pakchoi varieties. The results showed that considerable differences were observed in all the indicators detected under conditions of water deprivation compared with normal irrigation. Frequency distribution revealed that the indictors sensitivity with significant changes to water-deficient conditions was ordered as follows: aboveground fresh and dry weight, followed by belowground fresh and dry weight, root volume, root length, root activity, and soluble sugar. Correlation analysis showed that each indicator was significantly or extremely significantly associated with other indices, indicating that there is a certain degree of association between the indices. Principal component analysis (PCA) turned 16 indicators into four independent components, with a cumulative contri...