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在玉米和相关物种的繁殖障碍的分子进化

Elli Cryan^1,2,3, Garnet Phinney², Arun S Seetharam^4,5

¹Plant Sciences, University of California Davis, Davis, CA 95616, USA.

|May 7, 2025

概括

玉米和茶中的繁殖障碍是由三个位置 (Ga1,Ga2,Tcb1) 控制的. 一个非编码的Ga1等位基因 (ga1-Off) 沉默了这些障碍,揭示了一种新的生殖隔离机制.

科学领域:

植物生殖生物学植物生殖生物学
分子进化是分子进化的过程.
基因组学就是基因组学.

背景情况:

三个位置 - - 酸盐交叉屏障1 (Tcb1),胺基因1 (Ga1) 和Ga2 - - 控制了玉米和酸盐中的生殖屏障.
每个位点都编码了丝和花粉表达的pectin甲基化酶 (PME) 基因,这对于防止杂交至关重要.

研究的目的:

调查游戏原体因子位点的多样性和分子进化.
分析类型多样性,并确定在这些生殖障碍基因中受到积极选择的部位.

主要方法:

使用了一种新的玉米基因组组件 (P8860),具有活跃的Tcb1,Ga1和Ga2位点.
检查了17个物种的52个基因组,以分类类型多样性.
在PME基因中进行多样化选择的确定地点.

主要成果:

超过1200万年前,Ga2复制形成Ga1;Tcb1源于Zea多样化周围的Ga1复制.
在花粉和丝表达的PME中,积极选择的证据.
常见的ga1-Off等位基因,包含三个非编码的PME副本,产生siRNAs,降低Ga1和Tcb1屏障功能.

结论:

该ga1-Off等位基因代表了一种沉默生殖障碍的新机制.
这一发现提供了对海藻中物种界限的演变和维护的见解.

关键词:

游戏生理学因素游戏生理学因素基因组组装组合的基因组.玉米玉米玉米是一种分子进化分子演变.对于花粉来说,这是一个很好的选择.生殖障碍是造成生殖障碍的障碍.siRNA 是一个RNA.沉默器是一种沉默器.这是丝丝.传输比率扭曲的扭曲情况

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