Systemic Induction and Role of Mitochondrial Alternative Oxidase and Nitric Oxide in a Compatible Tomato-Tobacco mosaic virus Interaction

被引:78
作者
Fu, Li-Jun [1 ]
Shi, Kai [1 ]
Gu, Min [1 ]
Zhou, Yan-Hong [1 ]
Dong, De-Kun [2 ]
Liang, Wu-Sheng [3 ]
Song, Feng-Ming [3 ]
Yu, Jing-Quan [1 ]
机构
[1] Zhejiang Univ, Dept Hort, Hangzhou 310003, Zhejiang, Peoples R China
[2] Zhejiang Acad Agr Sci, Inst Crop & Nucl Technol Utilizat, Hangzhou, Zhejiang, Peoples R China
[3] Zhejiang Univ, Inst Biotechnol, Dept Plant Protect, Hangzhou 310003, Zhejiang, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
ACID-INDUCED RESISTANCE; SALICYLIC-ACID; ARABIDOPSIS-THALIANA; TRANSGENIC TOBACCO; SIGNALING PATHWAYS; ELECTRON-TRANSPORT; DOWN-REGULATION; NADPH OXIDASE; UP-REGULATION; EXPRESSION;
D O I
10.1094/MPMI-23-1-0039
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The role of mitochondrial alternative oxidase (AOX) and the relationship between AOX and nitric oxide (NO) in virus-induced systemic defense to Tobacco mosaic virus (TMV) were investigated in susceptible tomato (Solanum lycopersicum) plants. TMV inoculation to the lower leaves induced a rapid NO synthesis and AOX activation in upper uninoculated leaves as early as 0.5 day postinoculation. Application of exogenous potassium cyanide (KCN, a cytochrome pathway inhibitor) at nonlethal concentrations and NO donor diethylamine NONOate (DEA/NO) to the upper uninoculated leaves greatly induced accumulation of AOX transcript, reduced TMV viral RNA accumulation, and increased the leaf photochemical quantum yield at photosystem II. Pretreatment with NO scavenger almost completely blocked TMV-induced AOX induction and substantially increased TMV susceptibility. Salicylhydroxamic acid (SHAM, an AOX inhibitor) pretreatment reduced the DEA/NO-induced cyanide-resistant respiration and partially compromised induced resistance to TMV. Conversely, KCN and SHAM pretreatment had very little effect on generation of NO, and pretreatment with NO scavenger did not affect KCN-induced AOX induction and TMV resistance. These results suggest that TMV-induced NO generation acts upstream and mediates AOX induction which, in turn, induces mitochondrial alternative electron transport and triggers systemic basal defense against the viral pathogen.
引用
收藏
页码:39 / 48
页数:10
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