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第一作者:Guohong Albert Wu
第一单位:美国劳伦斯伯克利国家实验室
通讯作者:Daniel S. Rokhsar
Abstract
提出问题:The origin and dispersal of cultivated and wild mandarin and related citrus are poorly understood. 结果1-发现新的柑橘野生种:Here, comparative genome analysis of 69 new east Asian genomes and other mainland Asian citrus reveals a previously unrecognized wild sexual species native to the Ryukyu Islands: C. ryukyuensis sp. nov. 结果2-该野生种通过杂交形成各种新的柑橘物种:The taxonomic complexity of east Asian mandarins then collapses to a satisfying simplicity, accounting for tachibana, shiikuwasha, and other traditional Ryukyuan mandarin types as homoploid hybrid species formed by combining C. ryukyuensis with various mainland mandarins. 结果3-杂交种通过无融合生殖进行快速扩张:These hybrid species reproduce clonally by apomictic seed, a trait shared with oranges, grapefruits, lemons and many cultivated mandarins. 结果4-无融合基因起源追踪:We trace the origin of apomixis alleles in citrus to mangshanyeju wild mandarins, which played a central role in citrus domestication via adaptive wild introgression. 结论:Our results provide a coherent biogeographic framework for understanding the diversity and domestication of mandarin-type citrus through speciation, admixture, and rapid diffusion of apomictic reproduction. 摘 要
目前,我们对于栽培和野生桔子及其近缘柑橘类物种的起源和分布尚不清楚。本文中,作者通过对69个新的东亚桔子基因组和其他大陆亚洲柑橘基因组比较分析,鉴定到了一个不为人知的野生有性生殖物种,天然分布于琉球群岛,命名为C. ryukyuensis sp. nov。东亚桔子的分类复杂程度逐渐降低到一个比较简单的程度,其中像沙糖桔(tachibana)、shiikuwasha以及其他传统的琉球桔子品种都是由C. ryukyuensis和不同的大陆桔子同倍体杂交形成的。这些杂交种通过无融合生殖的种子进行无性繁殖,这一特性与橙子、西柚、柠檬以及很多其它栽培种桔子一样。作者发现,无融合生殖等位基因的起源可以追溯到莽山野桔这一野生桔子中,该野生种通过适应性的野生遗传渐滲在柑橘类物种的驯化过程中发挥核心作用。本文的研究结果为理解桔子类物种通过物种形成、遗传混杂以及无融合生殖的快速扩张所导致的物种多样性和驯化提供了一个清晰的生物地理框架。
通讯作者
** Daniel S. Rokhsar **
研究方向:利用计算基因组学和比较发育生物学,探究动物(及其他真核生物)的起源、演化和多态性。
doi: https://doi.org/10.1038/s41467-021-24653-0
Journal: Nature Communications
Published date: July 26, 2021
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