Genomic insights into the recent chromosome reduction of autopolyploid sugarcane Saccharum spontaneum

文献类型： 外文期刊

第一作者： Zhang, Qing

作者： Zhang, Qing;Qi, Yiying;Pan, Haoran;Tang, Haibao;Wang, Gang;Wang, Yongjun;Lin, Lianyu;Li, Zhen;Li, Yihan;Wang, Tianyou;Ma, Panpan;Dou, Meijie;Wang, Yibin;Wang, Hengbo;Zhang, Xingtan;Deng, Zuhu;Xu, Jingsheng;Zhang, Jisen;Hua, Xiuting;Yu, Fan;Yu, Zehuai;Chen, Baoshan;Zhang, Muqing;Huang, Yongji;Sun, Zongyi;Wang, Yuntong;Liu, Xinlong;Wang, Maojun;Wang, Jianping;Yang, Qinghui;Liu, ZhongJian;Ming, Ray

作者机构：

期刊名称：NATURE GENETICS （ 影响因子：41.307； 五年影响因子：39.321 ）

ISSN： 1061-4036

年卷期： 2022 年 54 卷 6 期

页码：

收录情况： SCI

摘要： Saccharum spontaneum is a founding Saccharum species and exhibits wide variation in ploidy levels. We have assembled a high-quality autopolyploid genome of S. spontaneum Np-X (2n = 4x = 40) into 40 pseudochromosomes across 10 homologous groups, that better elucidates recent chromosome reduction and polyploidization that occurred circa 1.5 million years ago (Mya). One paleo-duplicated chromosomal pair in Saccharum, NpChr5 and NpChr8, underwent fission followed by fusion accompanied by centromeric split around 0.80 Mya. We inferred that Np-X, with x = 10, most likely represents the ancestral karyotype, from which x = 9 and x = 8 evolved. Resequencing of 102 S. spontaneum accessions revealed that S. spontaneum originated in northern India from an x = 10 ancestor, which then radiated into four major groups across the Indian subcontinent, China, and Southeast Asia. Our study suggests new directions for accelerating sugarcane improvement and expands our knowledge of the evolution of autopolyploids. A high-quality autopolyploid genome of Saccharum spontaneum accession Np-X and resequencing of 102 accessions provide insights into the recent chromosome reduction and polyploidization in Saccharum.

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