Document Type

Journal Article

Department/Unit

Department of Biology

Title

The Arabidopsis gene SIGMA FACTOR-BINDING PROTEIN 1 plays a role in the salicylate- and jasmonate-mediated defence responses

Language

English

Abstract

The chloroplast-localized SIB1 protein was previously identified by its interaction with SIGMA FACTOR 1 (SIG1), a component of the RNA polymerase machinery responsible for transcription of plastid genes. The physiological function of SIB1 is little known. We found that expression of SIB1 is induced by infection with Pseudomonas syringae, suggesting its possible involvement in the defence response. The sib1 loss-of-function mutation compromises induction of some defence-related genes triggered by pathogen infection and the treatments with salicylic acid (SA) and jasmonic acid (JA), two key signalling molecules in the defence response. Conversely, constitutive over-expression of SIB1 causes the plants to hyper-activate defence-related genes following pathogen infection or the SA and JA treatments, leading to enhanced resistance to infection by P. syringae. SIB1 is a member of the large plant-specific VQ motif-containing protein family, and might act as a link to connect defence signalling with chloroplast function. © 2010 Blackwell Publishing Ltd.

Keywords

Disease resistance, Jasmonic acid, Salicylic acid, SIB1, Sigma factors

Publication Date

2010

Source Publication Title

Plant, Cell and Environment

Volume

33

Issue

5

Start Page

828

End Page

839

Publisher

Wiley

DOI

10.1111/j.1365-3040.2009.02109.x

ISSN (print)

01407791

ISSN (electronic)

13653040

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