The phytotoxin coronatine and methyl jasmonate impact multiple phytohormone pathways in tomato

被引:200
作者
Uppalapati, SR
Ayoubi, P
Weng, H
Palmer, DA
Mitchell, RE
Jones, W
Bender, CL [1 ]
机构
[1] Oklahoma State Univ, Dept Entomol & Plant Pathol, Stillwater, OK 74078 USA
[2] Oklahoma State Univ, Dept Biochem & Mol Biol, Stillwater, OK 74078 USA
[3] Hort & Food Res Inst New Zealand Ltd, Auckland, New Zealand
[4] Hort & Food Res Inst New Zealand Ltd, Palmerston North, New Zealand
关键词
auxin; ethylene; jasmonic acid; octadecanoid; Pseudomonas syringae;
D O I
10.1111/j.1365-313X.2005.02366.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Coronatine (COR) is a phytotoxin produced by several pathovars of Pseudomonas syringae and consists of coronafacic acid (CFA), an analog of methyl jasmonic acid (MeJA), and coronamic acid (CMA), which resembles 1-aminocyclopropane-1-carboxylic acid (ACC), a precursor to ethylene. An understanding of how COR functions, is perceived by different plant tissues, and the extent to which it mimics MeJA remain unclear. In this study, COR and related compounds were examined with respect to structure and function. The results indicate that conjugation of CFA to an amino acid is required for optimal activity in tomato, including chlorosis, changes in chloroplast structure, cell wall thickening, accumulation of proteinase inhibitors, induction of anthocyanins, and root growth inhibition. cDNA microarrays were utilized to understand the molecular processes that are regulated by MeJA, COR, CFA and CMA in tomato leaves. A comparison of COR- and MeJA-regulated transcriptomes revealed that COR regulated 35% of the MeJA-induced genes. There was significant overlap in the number of COR and CFA-regulated genes with CFA impacting the expression of 39.4% of the COR-regulated genes. Taken together, the results of biological assays, ultrastructural studies, and gene expression profiling demonstrate that: (1) the intact COR molecule impacts signaling in tomato via the jasmonic acid, ethylene, and auxin pathways; (2) CMA does not function as a structural analog of ACC; (3) COR has a broader range of functions than either CFA or CMA; and (4) COR and MeJA share similar, but not identical activities and impact multiple phytohormone pathways in tomato.
引用
收藏
页码:201 / 217
页数:17
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