Arabidopsis thalianaplants differentially modulate auxin biosynthesis and transport during defense responses to the necrotrophic pathogenAlternaria brassicicola

• DOI: 10.1111/j.1469-8137.2012.04208.x
• Publication Date: 2012-06-25T15:03:04Z
• Authors: Linlin Qi; Jiao Yan; Yanan Li; Hongling Jiang; Jiaqiang Sun; Qian Chen; Haoxuan Li; Jinfang Chu; Cunyu Yan; Xiaohong Sun; Yuanjie Yu; Changbao Li; Chuanyou Li
• Keywords: Alternaria brassicicola; Oxylipin

• Although the role of auxin in biotrophic pathogenesis has been extensively studied, relatively little is known about its plant resistance to necrotrophs. Arabidopsis thaliana mutants defective different aspects pathway are generally more susceptible than wild-type plants necrotrophic pathogen Alternaria brassicicola. We show that A. brassicicola infection up-regulates biosynthesis and down-regulates transport capacities infected plants, these effects being partially dependent on JA signaling. also together lead an enhanced response host plants. Application IAA MeJA synergistically induces expression defense marker genes PDF1.2 (PLANT DEFENSIN 1.2) HEL (HEVEIN-LIKE), suggesting enhancement JA-dependent signaling may be part auxin-mediated mechanism involved pathogens. Our results provide molecular evidence supporting hypothesis interact positively regulating pathogens activation by contribute