Arabidopsis 14-3-3 lambda is a positive regulator of RPW8-mediated disease resistance

作者：Yang Xiaohua; Wang Wenming; Coleman Mark; Orgil Undral; Feng Jiayue; Ma Xianfeng; Ferl Robert; Turner John G; Xiao Shunyuan^*

来源：Plant Journal, 2009, 60(3): 539-550.

DOI：10.1111/j.1365-313X.2009.03978.x

• Arabidopsis
• 14-3-3
• RPW8
• 2
• powdery mildew
• resistance
• SA signaling

P>The RPW8 locus from Arabidopsis thaliana Ms-0 includes two functional paralogous genes (RPW8.1 and RPW8.2) and confers broad-spectrum resistance via the salicylic acid-dependent signaling pathway to the biotrophic fungal pathogens Golovinomyces spp. that cause powdery mildew diseases on multiple plant species. To identify proteins involved in regulation of the RPW8 protein function, a yeast two-hybrid screen was performed using RPW8.2 as bait. The 14-3-3 isoform lambda (designated GF14 lambda) was identified as a potential RPW8.2 interactor. The RPW8.2-GF14 lambda interaction was specific and engaged the C-terminal domain of RPW8.2, which was confirmed by pulldown assays. The physiological impact of the interaction was revealed by knocking down GF14 lambda by T-DNA insertion, which compromised basal and RPW8-mediated resistance to powdery mildew. In addition, over-expression of GF14 lambda resulted in hypersensitive response-like cell death and enhanced resistance to powdery mildew via the salicylic acid-dependent signaling pathway. The results from this study suggest that GF14 lambda may positively regulate the RPW8.2 resistance function and play a role in enhancing basal resistance in Arabidopsis.

• 出版日期2009-11