Compensatory Ability and Defense Mechanism of Chinese Cabbage under High Temperature Stress

doi:10.3969/j.issn.1000-6362.2018.02.006

Abstract

Abstract: Chinese cabbage was taken as experimental material, which were cultured in a climate chamber with 12h/12h photoperiod under 37℃/30℃ for 3d, 6d, and 9d respectively before transferred to normal conditions (25℃/18℃). The samples were then cultured for 9d for recovery. Chinese cabbage cultured constantly under 25℃/18℃ was set as the control. The results showed that the growth of Chinese cabbage was hindered significantly by high temperature. The growth rate was 32.68%, 82.86%, and 100.00% lower than the control after stressed for 3, 6, and 9 days, respectively. The net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) decreased with increased treatment time of high temperature, while malondialdehyde (MDA) and intercellular CO2 concentration (Ci) increased. However, chlorophyll content, soluble protein, and antioxidant enzyme activities increased, which means defense mechanism of Chinese cabbage was motivated. During the recovery phase, the samples treated for 3 days and 6 days both increased in Pn, Gs, and Tr, while decreased in Ci, MDA content, soluble protein, and enzyme activities. The Chinese cabbage cultured under 37℃/30℃ for 3 days exhibited over- compensation during the 6th -9th day of recovery phase, the compensation index was 1.10. Chinese cabbage cultured under 37℃/30℃ for 6 days exhibited under-compensation, while which cultured for 9 days died during the recovery phase. The results indicated that high temperature treatment for more than 3 days can cause irreversible damage to Chinese cabbage. Grey correlation analysis revealed that the Pn, Gs, soluble protein, MDA, and chlorophyll content play key roles in the compensatory growth of Chinese cabbage, which were major driving factors for the compensatory growth of Chinese cabbage.

Key words: Photosynthetic characteristics, Antioxidant enzymes, Chlorophyll content, Grey correlation analysis

HAN Wei, SUN Chen-xi, ZHAO He-li, HU Qi, ZHENG Qing-zhou, SONG Xing-lin. Compensatory Ability and Defense Mechanism of Chinese Cabbage under High Temperature Stress[J]. Chinese Journal of Agrometeorology, 2018, 39(02): 119-128.

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