Document Type

Journal Article

Department/Unit

Department of Biology

Title

Calmodulin-binding protein CBP60g is a positive regulator of both disease resistance and drought tolerance in Arabidopsis

Language

English

Abstract

Calmodulin-binding proteins (CBPs) have been known to be involved in both biotic and abiotic stress responses. Recently, two closely related CBPs, Arabidopsis SAR Deficient 1 and CBP60g, were found to belong to a new family of transcription factors that regulate salicylic acid (SA) biosynthesis triggered by microbe-associated molecular patterns. In this study, we found that overexpression of CBP60g in Arabidopsis caused elevated SA accumulation, increased expression of the defense genes, and enhanced resistance to Pseudomonas syringae. In addition to the enhanced defense response, the CBP60g overexpression lines showed hypersensitivity to abscisic acid (ABA) and enhanced tolerance to drought stress. We also found that treatment with ABA and drought stress leads to a higher expression level of the ICS1 gene, which encodes isochorismate synthase, in the CBP60g overexpression lines than in the wild-type control plants. Our results suggest that CBP60g serves as a molecular link that positively regulates ABA-and SA-mediated pathways in plants. Key message Overexpression of CBP60g in Arabidopsis enhanced the defense response, hypersensitivity to abscisic acid and tolerance to drought stress. © 2012 Springer-Verlag.

Keywords

Abscisic acid, Arabidopsis thaliana, CBP60g, Drought tolerance, Overexpression, Salicylic acid

Publication Date

2012

Source Publication Title

Plant Cell Reports

Volume

31

Issue

7

Start Page

1269

End Page

1281

Publisher

Springer Verlag

DOI

10.1007/s00299-012-1247-7

Link to Publisher's Edition

http://dx.doi.org/10.1007/s00299-012-1247-7

ISSN (print)

07217714

ISSN (electronic)

1432203X

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