Hydrogen peroxide mediates spermidine-induced autophagy to alleviate salt stress in cucumber
文献类型： 外文期刊
作者： Zhang, Yuemei 1 ; Wang, Yu 1 ; Wen, Wenxu 1 ; Shi, Zhengrong 1 ; Gu, Qinsheng 2 ; Ahammed, Golam Jalal 3 ; Cao, Kai 4 ; J 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Hort, Nanjing 210095, Peoples R China
2.Chinese Acad Agr Sci, Zhengzhou Fruit Res Inst, Zhengzhou, Peoples R China
3.Henan Univ Sci & Technol, Coll Forestry, Luoyang, Peoples R China
4.Jiangsu Acad Agr Sci, Inst Agr Facil & Equipment, Key Lab Agr Engn Middle & Lower Reaches Yangtze R, Agr Minist, Nanjing, Peoples R China
5.Nanjing Agr Univ, Suqian Acad Protected Hort, Suqian, Peoples R China
关键词： Autophagy; cucumber; hydrogen peroxide; salt stress; spermidine
期刊名称：AUTOPHAGY （ 影响因子：16.016； 五年影响因子：16.586 ）
ISSN： 1554-8627
年卷期：
页码：
收录情况： SCI
摘要： Autophagy, an evolutionally conserved cellular degradation process, plays critical roles in plant development and stress response. Despite the wealth of information on the vital role of autophagy in responses to environmental stresses, little is known about the regulation of autophagy. In this study, we demonstrated that spermidine (Spd), a kind of polyamine, was involved in the regulation of salt tolerance through activating the expression of ATG (autophagy-related) genes and the formation of autophagosomes in cucumber under salt stress. Furthermore, NADPH oxidase-derived apoplastic H2O2-mediated Spd-induced salt tolerance and autophagy. Exogenous Spd significantly increased the tolerance to salt stress and inhibited the accumulation and ubiquitination of insoluble proteins. Foliar application of Spd promoted the transcript levels of ATG genes and autophagosomes formation. Besides, Spd induced the expression of RBOH (respiratory burst oxidase homolog), and the accumulation of H2O2 both in leaves and roots. However, either pretreatment with dimethylthiourea (DMTU, an H2O2 scavenger) or diphenyleneiodonium chloride (DPI, an inhibitor of NADPH oxidase) reduced Spd-induced accumulation of apoplastic H2O2. Importantly, Spd-induced salt tolerance and autophagy were compromised when plants were pretreated with DMTU or DPI. Furthermore, the silencing of ATG4 and ATG7 reduced Spd-induced salt tolerance and autophagosomes formation. Taken together, these results revealed that RBOH-dependent H2O2 mediated the Spd-induced autophagy and salt tolerance in cucumber.
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