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Plant function and evolutionary biology
RESEARCH ARTICLE

AtMYB44 positively modulates disease resistance to Pseudomonas syringae through the salicylic acid signalling pathway in Arabidopsis

Baohong Zou A B D , Zhenhua Jia C D , Shuangmei Tian A D , Xiaomeng Wang A , Zhenhua Gou A , Beibei Lü A and Hansong Dong A E
+ Author Affiliations
- Author Affiliations

A State Ministry of Education Key Laboratory of Integrated Management of Crop Pathogens and Insect Pests, Nanjing Agricultural University, Jiangsu, 210095, China.

B Department of Plant Biology, Cornell University, Ithaca, NY 14853, USA.

C Institute of Biology, Hebei Academy of Science, Shijiazhuang, Hebei 050051, China.

D These authors contributed equally to this work.

E Corresponding author. Email: hsdong@njau.edu.cn

Functional Plant Biology 40(3) 304-313 https://doi.org/10.1071/FP12253
Submitted: 26 May 2012  Accepted: 17 October 2012   Published: 19 November 2012

Abstract

Plant MYB transcription factors are implicated in resistance to biotic and abiotic stresses. Here, we demonstrate that an R2-R3 MYB transcription factor, AtMYB44, plays a role in the plant defence response to the bacterial pathogen Pseudomonas syringae pv. tomato DC3000 (PstDC3000). The expression of AtMYB44 was upregulated upon pathogen infection and treatments with defence-related phytohormones. Transgenic plants overexpressing AtMYB44 (35S-Ms) exhibited greater levels of PR1 gene expression, cell death, callose deposition and hydrogen peroxide (H2O2) accumulation in leaves infected with PstDC3000. Consequently, 35S-M lines displayed enhanced resistance to PstDC3000. In contrast, the atmyb44 T-DNA insertion mutant was more susceptible to PstDC3000 and exhibited decreased PR1 gene expression upon infection. Using double mutants constructed via crosses of 35S-M lines with NahG transgenic plants and nonexpressor of pathogenesis-related genes1 mutant (npr11), we demonstrated that the enhanced PR1 gene expression and PstDC3000 resistance in 35S-M plants occur mainly through the salicylic acid signalling pathway.

Additional keywords: defense responses, MYB, pathogens, stress.


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