广东海洋大学学报2017，Vol.37Issue(4)：34-40,7.DOI:10.3969/j.issn.1673-9159.2017.04.006
Hg-Cd复合胁迫对卵叶喜盐草光合色素和丙二醛含量及抗氧化酶活性的影响
Effects of Hg and Cd Combined Stress on Photosynthetic Pigments, Malondialdehyde Content and Antioxidant Enzyme Activities of Halophila ovalis
摘要
Abstract
Halophila ovalis is one main kind species of seagrass beds in coastal sea of South China. This study tried to explain the effects of Hg-Cd combined stress on the photosynthetic pigment content, malondialdehyde (MDA) content and the activities of SOD, POD and CAT of Halophila ovalis. The results showed that Hg-Cd combined stress had significant effect on the contents of chlorophyll a, chlorophyll b and carotenoid in the leaves of Halophila ovalis (P <0.05). When the combined concentration of Hg-Cd was more than 0.005 and 0.100 mg·L-1 (P <0.05), with concentration of Hg-Cd increment, the content of chlorophyll a and b was significantly decreased, and the photosynthesis of Halophila ovalis was inhibited. The content of MDA was increased by 41.5% when the concentration of Hg-Cd stress was 0.005 and 0.100 mg·L-1, respectively. The effects of Hg-Cd also had significant stress on the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (P <0.05). The activity of SOD decreased with the concentration gradient increasing. The activity of SOD was significantly decreased when the combined concentration of Hg-Cd was more than 0.01 and 0.2 mg·L-1, respectively. The activity of POD and CAT increased to the maximum after the concentration of Hg-Cd was more than 0.010 and 0.200 mg·L-1, respectively, which was 12.4% higher than that of the control group 22.8%. When the combined concentration of Hg-Cd was more than 0.015 and 0.300 mg·L-1, POD and CAT activities began to decline, and to the lowest at last. In general, the concentration of Hg-Cd combined stress was more than 0.005 and 0.100 mg·L-1, which resulted in decrease of photosynthetic content and antioxidant enzyme activity of Halophila ovalis.关键词
卵叶喜盐草/Hg/Cd/复合胁迫/光合色素/丙二醛/抗氧化酶活性Key words
Halophila ovalis/Hg/Cd/combined stress/photosynthetic pigments/malondialdehyde/antioxidant enzyme activity分类
农业科技引用本文复制引用
罗娅,黄翔鹄,李长玲..Hg-Cd复合胁迫对卵叶喜盐草光合色素和丙二醛含量及抗氧化酶活性的影响[J].广东海洋大学学报,2017,37(4):34-40,7.基金项目
广东省科技计划项目(2013B051000081) （2013B051000081）
