Relationship between carotenoid content and low-light-tolerance or chilling- and low-light-tolerance of pepper varieties | 弱光或低温弱光下辣椒叶片类胡萝卜素含量与品种耐性的关系

Chinese. 【目的】揭示弱光和低温弱光下辣椒叶片类胡萝卜素含量的变化规律,及其与品种耐弱光性或耐低温弱光性的关系,为辣椒种质耐性鉴定筛选适宜的指标和方法。【方法】以已知耐弱光性和耐低温弱光性的12个辣椒品种为试材,动态测定弱光和低温弱光下叶片类胡萝卜素含量,研究类胡萝卜素含量的变化规律及其与品种耐性的相关性。【结果】28℃/18℃、100 μmol?m-2?s-1弱光处理或15℃/5℃、100 μmol?m-2?s-1低温弱光处理均使辣椒叶片的类胡萝卜素含量逐渐降低,且低温弱光处理的降低幅度大于弱光处理的。28℃/18℃、100 μmol?m-2?s-1弱光处理5、10、15和20 d叶片的类胡萝卜素含量与辣椒耐弱光性综合隶属函数值均呈极显著正相关;15℃/5℃、100 μmol?m-2?s-1低温弱光处理10、15和20 d叶片的类胡萝卜素含量与辣椒耐低温弱光性综合隶属函数值呈显著负相关。【结论】弱光或低温弱光下辣椒叶片类胡萝卜素含量可以作为品种耐弱光性及耐低温弱光性的鉴定指标。弱光下辣椒叶片的类胡萝卜素含量越高,品种的耐弱光性越强;低温弱光下辣椒叶片的类胡萝卜素含量越低,品种的耐低温弱光性越强。

English. 【Objective】 Several correlations between the changes of carotenoid content and the tolerance of pepper seedlings under low light or low light with low temperature stress were studied. The objective of this study is to screen suitable indexes for evaluating low light- tolerance or chilling- and low light-tolerance of pepper seedlings.【Method】The correlations between the carotenoid content at different times and the tolerance of 12 pepper varieties (expressed as the averaged subordinate function values) under low light or low light with low temperature stress were studied by using correlation analysis. 【Result】 The carotenoid contents in pepper leaves decreased both under 28℃/18℃, 100 μmol?m-2?s-1 PFD stress and under 15℃/5℃, 100 μmol?m-2?s-1 PFD stress, and the carotenoid contents were more smaller in pepper leaves treated under low light with low temperature stress than in those treated under only low light stress. There were strong positive correlations between the averaged subordinate function values and the carotenoid contents in pepper leaves treated under 28℃/18℃, 100 μmol?m-2?s-1 PFD stress for 5, 10, 15, and 20 days. Significant negative correlations existed between the averaged subordinate function values and the carotenoid contents in pepper leaves treated under 15℃/5℃, 100 μmol?m-2?s-1 PFD stress for 10, 15, and 20 days. 【Conclusion】 It was suggested that carotenoid content in pepper leaves treated under 28℃/18℃, 100 μmol?m-2?s-1 PFD stress for 5, 10, 15, and 20 days or 15℃/5℃, 100 μmol?m-2?s-1 PFD stress for 10, 15, and 20 days could be used as good indicators for identification and screening low light- tolerant or chilling- and low light- tolerant pepper varieties. The higher the carotenoid content, the higher tolerance to low light stress. On the contrary, the higher the carotenoid content, the lower tolerance to low light with low temperature stress.