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Methyl jasmonate induced defense responses increase resistance to Fusarium oxysporum f. sp cubense race 4 in banana

文献类型： 外文期刊

作者： Sun, Dequan 1 ; Lu, Xinhua 1 ; Hu, Yulin 1 ; Li, Weiming 1 ; Hong, Keqian 1 ; Mo, Yiwei 2 ; Cahill, David M. 3 ; Xie, Jia 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, South Subtrop Crop Res Inst, Natl Field Genebank Trop Fruits, Zhanjiang 524091, Guangdong, Peoples R China

2.Univ Shaoxing, Sch Life Sci, Shaoxing 312000, Zhejiang, Peoples R China

3.Deakin Univ, Sch Life & Environm Sci, Geelong, Vic 3217, Australia

关键词： Methyl jasmonate;Banana plantlets;Fusarium oxysporum;Resistance responses

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

ISSN： 0304-4238

年卷期： 2013 年 164 卷

页码：

收录情况： SCI

摘要： Fusarium wilt, caused by the fungal pathogen Fusarium oxysporum, is a severe banana (Musa spp.) root disease, currently threatening banana production worldwide. Methyl jasmonate (MeJA) has been recognized for its ability to induce systemic defense against various pathogens. In this study, we treated banana plantlets with 1.5 mM exogenous MeJA. The effects of treatment on the level of chitinase, beta-1,3- glucanase, total phenols (TP), hydrogen peroxide (H2O2), superoxide radicals (O-2(-)), malondialdehyde (MDA), as well as the activities of superoxide dismutase (SOD), peroxidase (POD), polyphenol oxidase (PPO), catalase (CAT) and phenylalanine ammonia-lyase (PAL), plus disease incidence (DI) and disease severity (DS) were investigated. The results demonstrated that MeJA regulated the contents of H2O2 and O-2(-), and decreased MDA in banana roots. Meanwhile, plantlets treated with MeJA exhibited considerably higher chitinase, beta-1,3-glucanase and TP contents, and higher activities of SOD, POD, PPO, CAT and PAL In addition, MeJA treatment dramatically reduced disease incidence (DI) and disease severity (DS) of banana plants compared to control. The higher activities of scavenger antioxidant enzymes account for the reduction of cellular levels of reactive oxygen species (ROS), which is of vital importance for maintaining cell membrane integrity. The accumulation of pathogenesis-related proteins, chitinases and beta-1,3-glucanase, as well as total phenols and PAL activity in the treated roots also indicated that MeJA triggered key enzymes of secondary metabolite biosynthetic pathways, suggesting that MeJA was involved in the activation of a disease-related defense system. (C) 2013 Elsevier B.V. All rights reserved.

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