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《Agricultural Research in the Arid Areas》 2009-01
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Enhancement of exogenous nitric oxide to maize seedlings' resistance to salt stress

GU Qing-long1,MO Yi-wei2,TU Qing-hua3,LI Yun-he2,HU Yu-lin2,XI Jin-gen2(1.Yangzhou College of Education,Yangzhou,Jiangsu 225009,China;2.South Subtropical Crops Research Institute,Chinese Academy of Tropical Agricultural Sciences,Zhanjiang,Guangdong 524091,China;3.Fuzhou Vocational and Technical College,Fuzhou,Jiangxi 344000,China)  
To investigate whether maize(Zea mays L.)seedlings' tolerance to salt stress could be enhanced by exogenous nitric oxide,stress was made to maize seedlings at 4-leaf stage with 50 mmol/L of NaCl,and meanwhile various content of NO donor sodium nitroprusside(SNP) and NO scavenger CPTIO(2-(4-Carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide potassium salt) were added.The results showed that,with its concentration at 10~100 μmol/L SNP,the NO donor,could increase significantly the content of nitric oxide(NO),chlorophyll and relative water content in leaves,but decreased the super oxidtase redicals generating rate and LOX activities of leaves,meanwhile the content of malondiadehyde(MDA) and relative conductance were reduced but the dry weight of maize seedling was increased,and 40 μmol/L SNP had the most satisfactory effectt,while higher or lower SNP content had no such satisfactory effect.The stress to the growth of maize was accelerated when NO was eliminated by NO scavenger(CPTIO). So it could be concluded that proper content of NO could enhance maize seedlings' resistance to salt stress.While the effect was distinctly different when treated with 10~100 μmol/L NO scavenger CPTIO.These results suggested that the propriety NO content can enhance maize seedlings' resistance to salt stress.
【Fund】: 中央级公益性科研院所基本科研业务专项(2008-05)
【CateGory Index】: S513.01
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