文献类型： 外文期刊

作者： Tun, Win ¹ ; Yoon, Jinmi ² ; Vo, Kieu Thi Xuan ¹ ; Cho, Lae-Hyeon ² ; Hoang, Trung Viet ¹ ; Peng, Xin ³ ; Kim, Eui-Jung ¹ ; Win, Kay Tha Ye Soe ¹ ; Lee, Sang-Won ¹ ; Jung, Ki-Hong ¹ ; Jeon, Jong-Seong ¹ ; An, Gynheung ¹ ;

作者机构： 1.Kyung Hee Univ, Grad Sch Green Bio Sci, Yongin, South Korea

2.Pusan Natl Univ, Dept Plant Biosci, Miryang, South Korea

3.Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou, Peoples R China

关键词： Magnaporthe oryzae; OsPR10a; OsWRKY7; rice; sucrose

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2023 年 14 卷

页码：

收录情况： SCI

摘要： Sucrose controls various developmental and metabolic processes in plants. It also functions as a signaling molecule in the synthesis of carbohydrates, storage proteins, and anthocyanins, as well as in floral induction and defense response. We found that sucrose preferentially induced OsWRKY7, whereas other sugars (such as mannitol, glucose, fructose, galactose, and maltose) did not have the same effect. A hexokinase inhibitor mannoheptulose did not block the effect of sucrose, which is consequently thought to function directly. MG132 inhibited sucrose induction, suggesting that a repressor upstream of OsWRKY7 is degraded by the 26S proteasome pathway. The 3-kb promoter sequence of OsWRKY7 was preferentially induced by sucrose in the luciferase system. Knockout mutants of OsWRKY7 were more sensitive to the rice blast fungus Magnaporthe oryzae, whereas the overexpression of OsWRKY7 enhanced the resistance, indicating that this gene is a positive regulator in the plant defense against this pathogen. The luciferase activity driven by the OsPR10a promoter was induced by OsWRKY7 and this transcription factor bound to the promoter region of OsPR10a, suggesting that OsWRKY7 directly controls the expression of OsPR10a. We conclude that sucrose promotes the transcript level of OsWRKY7, thereby increasing the expression of OsPR10a for the defense response in rice.