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Effects of Exogenous NO on NO_3~——N,NH_4~+-N and Soluble Protein Contents and NR Activities in Cucumber Seedlings under NaCl Stress

FAN Huai-fu,GUO Shi-rong~*,DU Chang-xia,JIAO Yan-sheng,LI Na-na,DUAN Jiuju(College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China)  
Nutrient solution hydroponics was adopted to study the effects of exogenous NO on NO_3~——N,NH_4~+-N and soluble protein contents and NR activities in the roots and leaves of cucumber seedlings suffering the stress created with NaCl at 50 mmol·L~(-1).It was shown that with its concentration at 100 μmol·L~(-1) exogenous sodium nitroprusside,the NO donor,could raise the NR activities remarkably,slowed down the NO_3~——N decrease resulting from the salt stress and reduced the excessive NH_4~+-N accumulation and increased the content of soluble proteins,osmosis-regulating substances,in the root and leaves of cucumber seedlings suffering the NaCl stress,thereby abating the injury of salt stress to seedling plants of cucumber.
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