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Systemic acquired resistance in Cavendish banana induced by infection with an incompatible strain of Fusarium oxysporum f. sp cubense

文献类型： 外文期刊

作者： Wu, Yuanli 1 ; Yi, Ganjun 1 ; Peng, Xinxiang 3 ; Huang, Bingzhi 1 ; Liu, Ee 3 ; Zhang, Jianjun 3 ;

作者机构： 1.Guangdong Acad Agr Sci, Fruit Tree Res Inst, Guangzhou 510640, Guangdong, Peoples R China

2.Minist Agr, Key Lab South Subtrop Fruit Biol & Genet Resourc, Beijing, Peoples R China

3.South China Agr Univ, Coll Life Sci, Guangzhou 510642, Guangdong, Peoples R China

关键词： Fusarium wilt;Induced resistance;NPR1;PR gene;Salicylic acid

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.549； 五年影响因子：4.164 ）

ISSN： 0176-1617

年卷期： 2013 年 170 卷 11 期

页码：

收录情况： SCI

摘要： Fusarium wilt of banana is caused by the soil-borne fungus Fusarium oxysporum f. sp. cubense (Foc). The fact that there are no economically viable biological, chemical, or cultural measures of controlling the disease in an infected field leads to search for alternative strategies involving activation of the plant's innate defense system. The mechanisms underlying systemic acquired resistance (SAR) are much less understood in monocots than in dicots. Since systemic protection of plants by attenuated or avirulent pathogens is a typical SAR response, the establishment of a biologically induced SAR model in banana is helpful to investigate the mechanism of SAR to Fusarium wilt. This paper described one such model using incompatible Foc race 1 to induce resistance against Foc tropical race 4 in an in vitro pathosystem. Consistent with the observation that the SAR provided the highest level of protection when the time interval between primary infection and challenge inoculation was 10 d, the activities of defense-related enzymes such as phenylalanine ammonia lyase (PAL, EC 4.3.1.5), peroxidase (POD, EC 1.11.1.7), polyphenol oxidase (PPO, EC 1.14.18.1), and superoxide dismutase (SOD, EC 1.15.1.1) in systemic tissues also reached the maximum level and were 2.00-2.43 times higher than that of the corresponding controls on the tenth day. The total salicylic acid (SA) content in roots of banana plantlets increased from about 1 to more than 5 mu g g(-1) FW after the second leaf being inoculated with Foc race 1. The systemic up-regulation of MaNPR1A and MaNPR1B was followed by the second up-regulation of PR-1 and PR-3. Although SA and jasmonic acid (JA)/ethylene (ET) signaling are mostly antagonistic, systemic expression of PR genes regulated by different signaling pathways were simultaneously up-regulated after primary infection, indicating that both pathways are involved in the activation of the SAR. (C) 2013 Elsevier GmbH. All rights reserved.

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