Effects of salicylic acid on the photosystem 2 of barley seedlings under osmotic stress

被引：20
|
作者：
Luo, M. -H. [1 ,2 ]
Yuan, S. [1 ]
Chen, Y. -E. [1 ]
Liu, W. -J. [1 ]
Du, J. -B. [1 ]
Lei, T. [1 ]
Wang, M. -B. [1 ]
Lin, H. -H. [1 ]
机构：
[1] Sichuan Univ, Key Lab Bioresources & Ecoenvironm, Minist Educ, Coll Life Sci, Chengdu 610064, Peoples R China
[2] Mianyang Normal Univ, Dept Life Sci & Technol, Mianyang 621000, Sichuan, Peoples R China
来源：
BIOLOGIA PLANTARUM | 2009年 / 53卷 / 04期
关键词：
chlorophyll fluorescence; electrolyte leakage; Hordeum vulgare; net photosynthetic rate; reactive oxygen species; stomatal conductance; OXIDATIVE DAMAGE; WHEAT SEEDLINGS; WATER-STRESS; EXPRESSION; DECREASES; RESPONSES; PLANTS; H2O2;
D O I：
10.1007/s10535-009-0120-1
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
The effects of exogenous salicylic acid (SA) on photosystem 2 (PS 2) in barley (Hordeum vulgare L.) seedlings were investigated. SA pretreatment provided protection against subsequent osmotic stress. The highest protective effect of 0.25 mM SA was confirmed by determination of chlorophyll fluorescence, electrolyte leakage, malonyldialdehyde contents, PS 2 mRNAs and proteins. SA pretreatment increased reactive oxygen species (ROS), decreased net photosynthetic rate and stomatal conductance immediately, but prevented ROS accumulation during subsequent osmotic stress by activating antioxidant enzymes. Elimination of H2O2 during SA pretreatment inhibited almost all above mentioned SA effects. Therefore, SA pretreatment enhanced osmotic stress tolerance in barley seedlings mainly through ROS signals, rather than SA itself. The only SA-dependent and ROS-independent effect of exogenous SA on PS 2 was reduction of non-photochemical quenching.
引用
收藏
页码：663 / 669
页数：7
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