Journal
FUNCTIONAL PLANT BIOLOGY
Volume 40, Issue 3, Pages 304-313Publisher
CSIRO PUBLISHING
DOI: 10.1071/FP12253
Keywords
defense responses; MYB; pathogens; stress
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Funding
- national 973 Plan [2012CB114003]
- National Science Foundation of China [31171830, 31272027]
- National 863 program [2011AA10A205]
- Science Foundation of Hebei Science Academy [12342]
- Key Basic Research Program of Heibei Province [12965518D]
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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-Mlines 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-Mlines with NahG transgenic plants and nonexpressor of pathogenesisrelated genes1 mutant (npr1-1), we demonstrated that the enhanced PR1 gene expression and PstDC3000 resistance in 35S-M plants occur mainly through the salicylic acid signalling pathway.
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