Exogenous Silicon Mediates Alleviation of Cadmium Stress by Promoting Photosynthetic Activity and Activities of Antioxidative Enzymes in Rice

文献类型： 外文期刊

第一作者： Ai, Shaoying

作者： Ai, Shaoying;Li, Yichun;Wang, Yanhong;Tang, Mingdeng;Li, Linfeng;Ai, Shaoying;Li, Yichun;Wang, Yanhong;Tang, Mingdeng;Li, Linfeng;Ai, Shaoying;Li, Yichun;Wang, Yanhong;Tang, Mingdeng

作者机构：

关键词： Cadmium; Silicon; Rice; Photosynthesis; Oxidative stress; Antioxidative enzymes

期刊名称：JOURNAL OF PLANT GROWTH REGULATION （ 影响因子：4.169； 五年影响因子：4.038 ）

ISSN： 0721-7595

年卷期： 2018 年 37 卷 2 期

页码：

收录情况： SCI

摘要： We examined the role of silicon (Si) in alleviating cadmium (Cd) toxicity effects on photosynthesis and antioxidant homeostasis in rice. Rice (Oryza sativa L.) was planted in an aged field soil in a pot experiment, with or without exogenous Si. Brown rice Cd concentration decreased with Si addition, and the lowest value occurred at 4 g kg(-1) Si. Si application significantly improved photosynthesis by increasing the photosynthesis rate, intercellular CO2 concentration, and transpiration efficiency. Although minimal fluorescence (F (0)) changed only slightly, a significant increase was observed in variable fluorescence (F (v)), maximal fluorescence (F (m)), F (v)/F (m), and F (v)/F (0) with 4 g kg(-1) Si. Furthermore, exogenous Si markedly lowered oxidative stress by increasing superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase activities and reducing Cd-induced malondialdehyde and ROS accumulation. However, excessive sodium silicate could cause salt stress, which could trigger excessive reactive oxygen species production, causing oxidative damage. Our results confirmed that exogenous Si application mitigates the negative effects of Cd stress in rice by promoting photosynthetic and antioxidative enzyme activities. The photosynthetic and chlorophyll fluorescence parameters can be used to determine the sufficiency of Si treatment for recovery from Cd-stress in rice and production of rice with low Cd-accumulation.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序