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Differential gene expression in banana roots in response to Fusarium wilt

文献类型： 外文期刊

作者： Wang, Yuguang 1 ; Xia, Qiyu 1 ; Wang, Guihua 2 ; Zhang, He 2 ; Lu, Xuehua 1 ; Sun, Jianbo 1 ; Zhang, Xin 2 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Key Lab Trop Crop Biotechnol, Minist Agr, 4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, 4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China

关键词： banana;differentially expressed genes;flower bud differentiation period;Fusarium oxysporum f. sp cubense;transcriptome sequencing

期刊名称：CANADIAN JOURNAL OF PLANT PATHOLOGY （ 影响因子：2.442； 五年影响因子：1.993 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Banana wilt disease, caused by Fusarium oxysporum f. sp. cubense tropical race 4 (Foc TR4), is a devastating disease in the banana industry. The molecular mechanism underlying the wilt resistance of AAA-type banana cultivars has not been fully characterized. Our objective was to analyse the genes differentially expressed in roots during the time of flower bud differentiation in plants grown in fields infested with Foc TR4. We compared the Foc TR4-tolerant Formosana' banana and the susceptible Brazil' banana. cDNA libraries were constructed from RNA isolated from the roots of both cultivars, and generated approximately 40 million and 35 million high-quality reads, respectively. We mapped 28353810 Formosana' reads and 26917421 Brazil' reads to the banana genome. A search of the NR (non-redundant) database resulted in the annotation of 34408 genes. Additionally, 107 genes were differentially expressed between the two cultivars. Among the 48 differentially expressed genes with known functions, 41 were expressed more highly in Formosana' than in Brazil'. These genes were divided into several categories, including specific resistance mechanism-related enzyme genes and phytoalexin synthesis-related genes. The expression levels of eight genes were validated by a quantitative real-time polymerase chain reaction. Our results indicate that Formosana' may enhance its tolerance to Foc TR4 by increasing the expression of defence-related genes (possibly constitutively). This cultivar also exhibits up-regulated expression of non-specific stress-related genes, which may enhance its overall disease tolerance. This study provides important transcript-level details potentially useful for clarifying the molecular mechanism underlying the disease resistance of Cavendish banana cultivars.

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