关于陆地植物生长周期起源的性可变性假设
Susanne S Renner1, Dmitry D Sokoloff2
1Department of Biology, Washington University in Saint Louis, St. Louis, MO 63130, USA.
Current biology : CB
|July 23, 2024
概括
陆地植物代代交替的进化是由一个新的解释.
科学领域:
- 进化生物学 进化生物学
- 植物科学 植物科学
- 发展生物学 发展生物学
背景情况:
- 150年来,陆地植物代代交替的起源一直在争论中.
- 主导假设包括对立性和同源性假设,这些假设在胞体和细胞体代的起源和复杂性上有所不同.
- 之前的假设没有考虑性水平的变化或近期藻类类基因学的见解.
研究的目的:
- 为陆地植物生长周期的进化提出一个新的假设.
- 为了整合结合藻类的发育和繁殖与陆地植物进化的发现.
- 解释不同的胞体和胞体世代的发展.
主要方法:
- 对结合藻类的繁殖周期和 ploidy 水平进行比较分析.
- 重新评估了来自低代沃尼纪莱尼河的植物和罗纪胞体的化石证据.
- 结合藻类的植物遗传定位作为对陆地植物的准生态.
主要成果:
- 结合藻类表现出不稳定的性水平和多样化的繁殖策略,为早期陆地植物进化提供了一个模型.
- 化石证据与对立的假设相矛盾,并支持胞菌的早期复杂性.
- "性不稳定性"假说提出了一个不稳定的周期和类似形态的初始时期,随后是稳定.
结论:
- 祖先的陆地植物状况很可能涉及独立生活的类胞体和具有相似形态的类胞体.
- 性繁殖的稳定,包括伴生体的融合和半分裂的时间,导致了当前的代代交替.
- 持续的胞细胞保留在胞细胞上是一种特定于胞细胞的衍生性质.
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