Karyotype Stability and Unbiased Fractionation in the Paleo-Allotetraploid Cucurbita Genomes

文献类型： 外文期刊

第一作者： Sun, Honghe

作者： Sun, Honghe;Zhang, Guoyu;Guo, Shaogui;Ren, Yi;Zhang, Jie;Zhang, Haiying;Gong, Guoyi;Jia, Zhangcai;Zhang, Fan;Tian, Jiaxing;Li, Haizhen;Xu, Yong;Sun, Honghe;Wu, Shan;Jiao, Chen;Fei, Zhangjun;Lucas, William J.;Doyle, Jeff J.;Fei, Zhangjun

作者机构：

关键词： Cucurbita maxima;Cucurbita moschata;paleo-allotetraploid;karyotype stability;unbiased fractionation;allele-specific expression

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2017 年 10 卷 10 期

页码：

收录情况： SCI

摘要： The Cucurbita genus contains several economically important species in the Cucurbitaceae family. Here, we report high-quality genome sequences of C. maxima and C. moschata and provide evidence supporting an allotetraploidization event in Cucurbita. We are able to partition the genome into two homoeologous subgenomes based on different genetic distances to melon, cucumber, and watermelon in the Benincaseae tribe. We estimate that the two diploid progenitors successively diverged from Benincaseae around 31 and 26 million years ago (Mya), respectively, and the allotetraploidization happened at some point between 26 Mya and 3 Mya, the estimated date when C. maxima and C. moschata diverged. The subgenomes have largely maintained the chromosome structures of their diploid progenitors. Such long-term karyotype stability after polyploidization has not been commonly observed in plant polyploids. The two subgenomes have retained similar numbers of genes, and neither subgenome is globally dominant in gene expression. Allele-specific expression analysis in the C. maxima x C. moschata interspecific F-1 hybrid and their two parents indicates the predominance of trans-regulatory effects underlying expression divergence of the parents, and detects transgressive gene expression changes in the hybrid correlated with heterosis in important agronomic traits. Our study provides insights into polyploid genome evolution and valuable resources for genetic improvement of cucurbit crops.

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