期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 65, 期 2, 页码 595-607出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ert404
关键词
Cross-tolerance; hydrogen peroxide; mitogen-activated protein kinase; reactive oxygen species; Respiratory burst oxidase homologue 1; signal transduction; Solanum lycopersicum
资金
- National Basic Research Program of China [2009CB119000]
- National Natural Science Foundation of China [31372109, 30972033]
H2O2 and mitogen-activated protein kinase (MAPK) cascades play important functions in plant stress responses, but their roles in acclimation response remain unclear. This study examined the functions of H2O2 and MPK1/2 in acclimation-induced cross-tolerance in tomato plants. Mild cold, paraquat, and drought as acclimation stimuli enhanced tolerance to more severe subsequent chilling, photooxidative, and drought stresses. Acclimation-induced cross-tolerance was associated with increased transcript levels of RBOH1 and stress- and defence-related genes, elevated apoplastic H2O2 accumulation, increased activity of NADPH oxidase and antioxidant enzymes, reduced glutathione redox state, and activation of MPK1/2 in tomato. Virus-induced gene silencing of RBOH1, MPK1, and MPK2 or MPK1/2 all compromised acclimation-induced cross-tolerance and associated stress responses. Taken together, these results strongly suggest that acclimation-induced cross-tolerance is largely attributed to RBOH1-dependent H2O2 production at the apoplast, which may subsequently activate MPK1/2 to induce stress responses.
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