自不相容性等位基因之间的主导性决定了囊类全聚类的交配系统
Tianlin Duan1, Zebin Zhang1,2, Mathieu Genete3
1Department of Ecology and Genetics, Evolutionary Biology Centre, Science for Life Laboratory, Uppsala University, Uppsala, Sweden.
Evolution letters
|August 5, 2024
概括
植物交配系统可以快速转变. 这项研究表明混合体的自我兼容性源于基因优势,这解释了多倍体形成过程中瞬间失去自我不兼容性的原因.
科学领域:
- 植物进化生物学 植物进化生物学
- 遗传学和基因组学 遗传学和基因组学
- 生殖生物学 生殖生物学
背景情况:
- 从外交到自我受精的过渡是植物的主要进化事件,对进化路径产生重大影响.
- 在Brassicaceae中,自我不相容性 (SI) 由S位点控制,涉及SCR和SRK基因以及调节SCR活动并建立主导层次的小型非编码RNA.
- 在Brassicaceae中的多化通常导致自我兼容性 (SC),但SI损失的时间和机制仍然不清楚.
研究的目的:
- 为了调查是否自我不兼容性 (SI) 损失发生在杂交后立即发生或在多化血统后期发生.
- 为了确定S-haplotypes之间的主导相互作用是否解释了多类Brassicaceae中自我相容 (SC) 类型的流行.
- 探索表观遗传调节在控制全聚合体中S-基因组主导地位方面的作用.
主要方法:
- 在自我受精的*Capsella orientalis*和外交的*Capsella grandiflora*之间产生合成双倍体和四倍体杂交.
- 年轻花朵的RNA测序,以量化*SCR*基因的等位基因特异性表达,并推断S-杂型主导.
- 在合成杂交物中评估自主自我授粉成功 (种子组),以确定交配系统表型.
主要成果:
- 合成杂交物中的自我相容性与来自父母血统的遗传S-基因基因之间的相对支配性直接相关.
- 这些发现证实,SI可以在全聚类血统形成时瞬间消失.
- 对S-基因主导的表观遗传调节在全聚类动物的亚基因组之间有效地运作.
结论:
- 自我不相容性 (SI) 的瞬间丧失可以发生在多体植物系的形成过程中,这是由于S-haplotype主导相互作用造成的.
- 支配S-基因主导的表观遗传机制在全聚体中起作用,影响交配系统.
- 了解SI机制提供了对交配系统的共同进化和植物中的形变化的关键见解.
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