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Genetic Diversity in FUB Genes of Fusarium oxysporum f. sp. cubense Suggests Horizontal Gene Transfer

文献类型： 外文期刊

作者： Liu, Siwen 1 ; Wu, Bo 2 ; Lv, Shuxia 3 ; Shen, Zongzhuan 4 ; Li, Rong 4 ; Yi, Ganjun 2 ; Li, Chunyu 2 ; Guo, Xiuwu 1 ;

作者机构： 1.Shenyang Agr Univ, Coll Hort, Shenyang, Liaoning, Peoples R China

2.Guangdong Acad Agr Sci, Key Lab South Subtrop Fruit Biol & Genet Resource, Key Lab Trop & Subtrop Fruit Tree Res Guangdong P, Minist Agr,Inst Fruit Tree Res, Guangzhou, Guangdong, Peoples R China

3.Shenyang Agr Univ, Coll Biosci & Biotechnol, Shenyang, Liaoning, Peoples R China

4.Nanjing Agr Univ, Jiangsu Key Lab Solid Organ Waste Utilizat, Key Lab Plant Nutr & Fertilizat Low Middle Reache, Minist Agr,Coll Resources & Environm Sci, Nanjing, Jiangsu, Peoples R China

关键词： Panama disease; Fusarium oxysporum f. sp. cubense; fusaric acid; horizontal gene transfer; phylogeny

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2019 年 10 卷

页码：

收录情况： SCI

摘要： Fusaric acid (FA) is an important secondary metabolite of many Fusarium species and involved in the wilt symptoms caused in banana by Fusarium oxysporum f. sp. cubense (Foc). To investigate the evolution characteristics of the 12 Foc FA biosynthetic genes (FUB), coding sequences of the 12 FUB genes and three housekeeping genes, EF-1 alpha/RPB1/RPB2 (translation elongation factor-1 alpha/RNA polymerase II subunit I/RNA polymerase II subunit II), were subjected to genetic diversity analysis, phylogenetic analysis, recombination detection, and selective pressure analysis. The results of selective pressure analysis showed that the 15 genes were mainly subjected to negative selection. However, a significantly higher number of silent mutations, which could not be simply explained by selective pressure difference, were observed in the 12 FUB genes in Foc than in the three housekeeping genes. Infraspecies phylogeny and recombination detection analysis showed that significantly more horizontal gene transfer (HGT) events (normalized) had occurred in the FUB genes than in the three housekeeping genes. In addition, many of these events involved outgroup isolates and significantly increased the genetic diversity of FUB genes in Foc. The infraspecies phylogenetic analysis suggested that the polyphyletic phylogeny proposed for Foc requires further discussion, and the divergence of race 1, race 4, and the common ancestor of several F. oxysporum (Fo) isolates pathogenic to nonbanana plants should have diverged over a short period. Finally, our results suggest that the FUB genes in Fo should have benefited from HGT to gain a relatively high genetic diversity to respond to different host plants and environments despite mainly being subject to negative selection.

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