The Cytokinin-Activated Transcription Factor ARR2 Promotes Plant Immunity via TGA3/NPR1-Dependent Salicylic Acid Signaling in Arabidopsis
- Authors
- Choi, Jaemyung; Huh, Sung Un; Kojima, Mikiko; Sakakibara, Hitoshi; Paek, Kyung-Hee; Hwang, Ildoo
- Issue Date
- 17-8월-2010
- Publisher
- CELL PRESS
- Keywords
- Devbio; Molimmuno
- Citation
- DEVELOPMENTAL CELL, v.19, no.2, pp.284 - 295
- Indexed
- SCIE
SCOPUS
- Journal Title
- DEVELOPMENTAL CELL
- Volume
- 19
- Number
- 2
- Start Page
- 284
- End Page
- 295
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/115872
- DOI
- 10.1016/j.devcel.2010.07.011
- ISSN
- 1534-5807
- 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.
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Collections - College of Life Sciences and Biotechnology > Division of Life Sciences > 1. Journal Articles
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