文献类型： 外文期刊

作者： Zhang Gu-wen ¹ ; Xu Sheng-chun ¹ ; Hu Qi-zan ¹ ; Mao Wei-hua ² ; Gong Ya-ming ¹ ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Vegetable, Hangzhou 310021, Zhejiang, Peoples R China

2.Zhejiang Univ, Ctr Anal & Measurement, Hangzhou 310029, Peoples R China

关键词： NaCl stress;oxidative damage;putrescine;salt-tolerance;vegetable soybean

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2014 年 13 卷 2 期

页码：

收录情况： SCI

摘要： Polyamines play important roles in plant tolerance to environmental stress. With the aim of investigating the possible involvement of putrescine (Put) in salt-tolerance mechanisms in vegetable soybean roots, exogenous Put (10 mmol L-1) and its biosynthetic inhibitor D-arginine (D-Arg) (0.5 mmol L-1) were added to nutrient solution when vegetable soybean (Glycine max L. cv. Huning 95-1) seedlings were exposed to 100 mmol L(-1)sodium chloride (NaCl). The results showed that Put ameliorated but D-Arg aggravated the detrimental effects of NaCl on plant growth and biomass production. Under NaCl stress, levels of free, soluble conjugated and insoluble bound types of Put in roots of vegetable soybean were reduced, whereas those of free, soluble conjugated, and insoluble bound types of spermidine (Spd) and spermine (Spm) were increased. Exogenous Put eliminated the decrease in Put but promoted the increase of Spd and Spm. However, these changes could be reversed by D-Arg. Under NaCl stress, activities of arginine decarboxylase (ADC), S-adenosylmethionine decarboxylase (SAMDC), diamine oxidase (DAO), and polyamine oxidase (PAO) were induced, with exogenous Put promoting and D-Arg reversing these changes. Furthermore, NaCl stress decreased activities of antioxidant enzymes. Exogenous Put alleviated but D-Arg exaggerated these effects of NaCl stress, resulting in the same changes in membrane damage and reactive oxygen species (ROS) production. These results indicated that Put plays a positive role in vegetable soybean roots by activating antioxidant enzymes and thereby attenuating oxidative damage.