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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (09): 1710-1715.doi: 10.3724/SP.J.1006.2012.01710


Modulation of Exogenous Nitric Oxide on Photosystem II Functions in Wheat Seedlings under Drought Stress

SHAO Rui-Xin1,2,XIN Long-Fei1,YANG Qing-Hua1,SHANG-GUAN Zhou-Ping2,*   

  1. 1 Agronomy College of Henan Agriculture University / Key Laboratory of Physiology, Ecology and Genetic Improvement of Food Crops in Henan Province, Zhengzhou 450002, China; 2 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, 712100, China
  • Received:2011-12-21 Revised:2012-04-20 Online:2012-09-12 Published:2012-07-03
  • Contact: 上官周平, E-mail: shangguan@ms.iswc.ac.cn

Abstract: Nitric oxide (NO) has emerged as a key molecule involving in tolerating various abiotic stresses that induce physiological responses in plants. To characterize the role of NO in tolerance of photosystem II (PSII) to drought stress induced by polyethylene glycol (PEG), we used sodium nitroprusside (SNP) of 0.1 mmol L-1as exogenous NO donor to study the biologically protective effects of NO at a low concentration on PSII functions in wheat (Triticum aestivum L.) seedlings hydroponically grown under -0.5 MPa PEG stress. Under drought stress, SNP supplement increased the water potential (Ψw) and chlorophyll content, maintained favorable status of electron transport (ФPSII and Fm/Fo) and potential high activity of PSII reaction centers (Fv/Fo) on the first and third days of treatment. The open proportion of PSII reaction centers (qP) and absorbed-light allocation to photochemical reaction(Pr)were higher in the treatment of SNP supplement under drought stress than in only PEG treatment. SNP alleviated drought-induced inhibition to absorbed-energy conversion of open PSII (Fv′/Fm′), safely dissipating excessive light energy in PSII reaction centers. Therefore, NO could modulate the PSII functions in photosynthesis of wheatseedlings hydroponically exposed to PEG stress.

Key words: Nitric oxide, PSII functions, Chlorophyll content, Wheat, Drought stress

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