The Cytokinin-Activated Transcription Factor ARR2 Promotes Plant Immunity via TGA3/NPR1-Dependent Salicylic Acid Signaling in Arabidopsis
SCIE
SCOPUS
- Title
- The Cytokinin-Activated Transcription Factor ARR2 Promotes Plant Immunity via TGA3/NPR1-Dependent Salicylic Acid Signaling in Arabidopsis
- Authors
- Choi, J; Huh, SU; Kojima, M; Sakakibara, H; Paek, KH; Hwang, I
- Date Issued
- 2010-08-17
- Publisher
- CELL PRESS
- Abstract
- 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.
- Keywords
- B RESPONSE REGULATORS; PATHOGEN INTERACTIONS; DISEASE RESISTANCE; MERISTEM ACTIVITY; TRANSDUCTION; DEFENSE; PERCEPTION; STRESS; ROLES; SHOOT
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25318
- DOI
- 10.1016/J.DEVCEL.2010.07.011
- ISSN
- 1534-5807
- Article Type
- Article
- Citation
- DEVELOPMENTAL CELL, vol. 19, no. 2, page. 284 - 295, 2010-08-17
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