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Effects of pH and salinity stress on photosynthesis and antioxidant system of Sargassum thunbergii
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Affiliation:

College of Fisheries and Life Science, Shanghai Ocean University;Yellow Sea Fisheries Research Institute,Yellow Sea Fisheries Research Institute,Yellow Sea Fisheries Research Institute,Yellow Sea Fisheries Research Institute,Yellow Sea Fisheries Research Institute,Yellow Sea Fisheries Research Institute,College of Fisheries and Life Science, Shanghai Ocean University;Yellow Sea Fisheries Research Institute

Clc Number:

Q945；S917.3

Fund Project:

The National High Technology Research and Development Program of China (863 Program)

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    Abstract:

    In this study, a liquid-phase oxygen electrode system and an antioxidant enzymes kit were used to determine the photosynthetic characteristics and antioxidant system of Sargassum thunbergii at various pH and salinities. The net photosynthetic rates (Pn), pigment content, maleic dialdehyde (MDA) content and antioxidant enzymes activity of S. thunbergii were investigated. The major results included: (1) Pn rapidly decreased at pH 6.0 and pH 9.5 for 24 h, which were remarkably significant (P<0.05) compared with that of the control (pH 8.5) for 48 h. (2) Both superoxide dismutase (SOD) and catalase (CAT) activity increased significantly (P<0.05) at pH 9.5 for 48 h. And MDA content firstly increased, then decreased at pH 9.5 for 48 h. Compared with that of control (salinity 31), Pn decreased significantly (P<0.05) at salinity 15 for 24 h and at salinity 25 or salinity 20 for 48 h. However, Pn had some rise at salinity 25, 20 and 15 for 72h. (4) MDA content increased significantly (P<0.05) at first 24 h and then rapidly decreased at salinity 20. And both SOD and CAT activity increased significantly (P<0.05) at salinity 20 from 24 h to 48 h. MDA content increased significantly (P<0.05) with SOD, CAT activity relatively low at salinity 15 after 72 h. Above results indicated that photosynthetic capacity of S. thunbergii was inhibited at pH 6.0 and pH 9.5. S. thunbergii was damaged by reactive oxygen species (ROS) under strong alkaline stress. Antioxidant enzymes eliminated ROS readily at salinity over 15, but had low activity at salinity 15. In a word, these results revealed the change of photosynthetic capacity and provided reference for the regulating mechanism of antioxidant system response under adversity stress.

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马兴宇,刘福利,梁洲瑞,王飞久,孙修涛,汪文俊,凌晶宇. pH与盐度胁迫对鼠尾藻光合作用及抗氧化系统的影响[J].上海海洋大学学报,2014,23(2):208-214.
MA Xing-yu, LIU Fu-li, LIANG Zhou-rui, WANG Fei-jiu, SUN Xiu-tao, WANG Wen-jun, LING Jing-yu. Effects of pH and salinity stress on photosynthesis and antioxidant system of Sargassum thunbergii[J]. Journal of Shanghai Ocean University,2014,23(2):208-214.

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History
  • Received:October 13,2013
  • Revised:December 23,2013
  • Adopted:January 02,2014
  • Online: March 19,2014
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