Plant Physiology Preview
Published on March 9, 2007; 10.1104/pp.107.096842
OPEN ACCESS ARTICLE
Received February 4, 2007
Accepted March 1, 2007
Nitric Oxide Synthase Cmediated Nitric Oxide Is Associated with Salt Tolerance in Arabidopsis
Min-Gui Zhao , Qiu-Ying Tian , and Wen-Hao Zhang *
Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, P. R. China
* Corresponding author; email: whzhang{at}ibcas.ac.cn.
Nitric oxide (NO) has emerged as a key molecule involved in many physiological processes in plants. To characterize roles of NO in tolerance of Arabidopsis to salt stress, effect of NaCl on Arabidopsis thaliana wild-type and mutant (Atnoa1) plants with an impaired in vivo NOS activity and a reduced endogenous NO level was investigated. Atnoa1 mutant plants displayed a greater Na+/K+ ratio in shoots than wild-type plants due to enhanced accumulation of Na+ and reduced accumulation of K+ when exposed to NaCl. Germination of Atnoa1 seeds was more sensitive to NaCl than that of wild-type seeds, and wild-type plants exhibited higher survival rates than Atnoa1 plants when grown under salt stress. Atnoa1 plants had higher levels of H2O2 than wild-type plants under both control and salt stress, suggesting that Atnoa1 is more vulnerable to salt and oxidative stress than wild-type plants. Treatments of wild-type plants with NOS inhibitor and NO scavenger reduced endogenous NO levels and enhanced NaCl-induced increase in Na+/K+ ratio. Exposure of wild-type plants to NaCl inhibited NOS activity and reduced quantity of NOA1 protein, leading to a decrease in endogenous NO levels measured by NO-specific fluorescent probe. Treatment of Atnoa1 plants with NO donor sodium nitroprusside attenuated the NaCl-induced increase in Na+/K+ ratio. Therefore these findings provide direct evidence in support of that disruption of NOS-dependent NO production is associated with salt tolerance in Arabidopsis.
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