三种红树根部组织抗氧化酶活性对水淹胁迫的响应

doi:10.11978/2021107

Abstract

Abstract:

Based on the natural distribution of different mangrove populations, Avicennia marina, Aegiceras corniculatum and Bruguiera gymnorrhiza were chosen to be the experimental species that have different resistance of water-logging. The activities of peroxidase (POD), superoxide dismutase (SOD), ascorbate oxidase (APX) and catalase (CAT) in root tissues of three species of mangrove were tested after submerging for 0d, 1d, 3d, 5d, 7d and 14d. Under hypoxia environment, the balances of production and elimination of reactive oxygen species (ROS) would be destroyed and a large amount of ROS were accumulated. The results showed that POD increased with time during the period from 1d to 14d, which may be related to the involvement of scavenging of toxic substances in addition to the elimination of reactive oxygen. The CAT, SOD and APX increased when mangroves encounter the water-logging and then decreased. The enzymes play an important role in eliminating the large amount of ROS in the root tissues of mangrove plants during the early period of the waterlogging stress. There were some differences in the expression quantity of antioxidant enzyme system among the three mangrove plants but the fluctuations are similar. Hierarchical clustering analysis of various enzyme activity indexes indicated that the activity pattern of antioxidant enzyme system in A.marina was different from that in A. corniculatum and B. gymnorrhiza. There was no significant difference in the expression pattern between A. corniculatum and B. gymnorrhiza. The research aims to better understand the physiological mechanism of mangrove to resist waterlogging stress and to provide theoretical foundation for protecting mangrove ecosystem.

Key words: mangrove plants, water-logging stress, antioxidant enzyme system, clustering analysis

CLC Number:

Q945.78

SU Boyu, ZHANG Weishi, WANG Youshao. Response of antioxidant enzyme systems in root tissues of three mangrove species to waterlogging stress[J].Journal of Tropical Oceanography, 2022, 41(6): 35-43.

Figures/Tables 6

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Response of antioxidant enzyme systems in root tissues of three mangrove species to waterlogging stress

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