Journal of Integrative Agriculture ›› 2016, Vol. 15 ›› Issue (12): 2736-2744.DOI: 10.1016/S2095-3119(16)61495-8

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  • 收稿日期:2016-06-05 出版日期:2016-12-01 发布日期:2016-12-02

DNA methylation patterns of banana leaves in response to Fusarium oxysporum f. sp. cubense tropical race 4

LUO Jing-yao, PAN Xiao-lei, PENG Tie-cheng, CHEN Yun-yun, ZHAO Hui, MU Lei, PENG Yun, HE Rui, TANG Hua   

  1. Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Agriculture, Hainan University, Haikou 570228, P.R.China
  • Received:2016-06-05 Online:2016-12-01 Published:2016-12-02
  • Contact: TANG Hua, Mobile: +86-13138915025, E-mail: thtiger@163.com
  • About author:LUO Jing-yao, E-mail: sunney729@163.com
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (30860149 and 31360364), the Joint Support Program from Tropical Crop Breeding Engineering Center of Ministry of Education of China and the Crop Science National Key Disciplines of China (lhxm-2012-2), and the Key Scientific Research Program from Hainan Province, China (ZDZX2013023).

Abstract:     Fusarium wilt of banana, which is caused by Fusarium oxysporum f. sp. cubense tropical race 4 (Foc TR4), is a serious soil-borne fungal disease. Now, the epigenetic molecular pathogenic basis is elusive. In this study, with methylation-sensitive amplification polymorphism (MSAP) technique, DNA methylation was compared between the leaves inoculated with Foc TR4 and the mock-inoculated leaves at different pathogenic stages. With 25 pairs of primers, 1 144 and 1 255 fragments were amplified from the infected and mock-inoculated leaves, respectively. DNA methylation was both changed and the average methylated CCGG sequences were 34.81 and 29.26% for the infected and the mock-inoculated leaves. And DNA hypermethylation and hypomethylation were induced by pathogen infection during all pathogenic stages. Further, 69 polymorphic fragments were sequenced and 29 of them showed sequence similarity to genes with known functions. And RT-PCR results of four genes indicated that their expression patterns were consistent with their methylation patterns. Our results suggest that DNA methylation plays important roles in pathogenic response to Foc TR4 for banana.

Key words: banana ,  Fusarium wilt disease ,  Fusarium oxysporum f. sp. cubense tropical race 4 (Foc TR4) ,  DNA methylation ,  methylation-sensitive amplification polymorphism (MSAP) ,  epigenetics ,  disease defense genes