The Cytokinin-Activated Transcription Factor ARR2 Promotes Plant Immunity via TGA3/NPR1-Dependent Salicylic Acid Signaling in Arabidopsis

被引：356

作者：

Choi, Jaemyung ^{[1
]}

Huh, Sung Un ^{[2
]}

Kojima, Mikiko ^{[3
]}

Sakakibara, Hitoshi ^{[3
]}

Paek, Kyung-Hee ^{[2
]}

Hwang, Ildoo ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Dept Life Sci, Pohang 790784, South Korea

[2] Korea Univ, Plant Signaling Network Res Ctr, Sch Life Sci & Biotechnol, Seoul 136701, South Korea

[3] Inst Phys & Chem Res, RIKEN, Plant Sci Ctr, Yokohama, Kanagawa 2300045, Japan

来源：

DEVELOPMENTAL CELL | 2010年 / 19卷 / 02期

关键词：

B RESPONSE REGULATORS; RESISTANCE; TRANSDUCTION; MERISTEM; ROLES; SHOOT; SA; PHOSPHORYLATION; BIOSYNTHESIS; PERCEPTION;

D O I：

10.1016/j.devcel.2010.07.011

中图分类号：

Q2 [细胞生物学];

学科分类号：

071009 ; 090102 ;

摘要：

Cytokinins affect plant immunity to various pathogens; however, the mechanisms coupling plant-derived cytokinins to pathogen responses have been elusive. Here, we found that plant-derived cytokinins promote resistance of Arabidopsis to Pseudomonas syringae pv. tomato DC3000 (Pst). Modulated cytokinin levels or signaling activity in CKX- or IPT-overexpressing plants or in ahk2 ahk3 mutants correlated with altered resistance. In fact, the cytokinin-activated transcription factor ARR2 contributes specifically to Pst resistance. The salicylic acid (SA) response factor TGA3 binds ARR2, and mutation of TGA-binding cis-elements in the Pr1 promoter abolished cytokinin- and ARR2-dependent Pr1 activation. Cytokinin treatment did not increase pathogen resistance in tga3 plants, as the cytokinin-dependent induction of Pr1 was eliminated. Moreover, SA signaling enhanced binding of ARR2/TGA3 to the Pr1 promoter. Taken together, these results show that cytokinins modulate the SA signaling to augment resistance against Pst, a process in which the interaction between TGA3 and ARR2 is important.

引用

页码：284 / 295

页数：12

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