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分子遗传学和Aytoniaceae (Marchantiophyta) 形态复杂性的演变
You-Liang Xiang1, Chao Shen2, Wen-Zhang Ma3
1School of Life Science, Guizhou Normal University, Huaxi District, Guiyang 550025, China.
Plants (Basel, Switzerland)
|April 27, 2024
概括
肝的Aytoniaceae家族是单一的,有五个不同的分类被确定. 这项研究重建了它们的进化历史和形态特征,揭示了白时期的分歧事件.
科学领域:
- 植物系统学与进化论
- 瘤学 瘤学是一门学科.
- 分子遗传学分子遗传学
背景情况:
- 艾托尼亚科 (Aytoniaceae) 是一大家族的复杂状肝 (Marchantiopsida),包括大约70个物种,主要分布在温带地区.
- 艾托尼亚科的进化历史和形态发展仍然不完全理解,需要进一步的遗传学研究.
研究的目的:
- 使用分子数据重建Aytoniaceae的系谱.
- 研究家族内部形态特征的演变.
- 为了建立一个时间表,主要clades的分歧事件.
主要方法:
- 用两个叶绿细胞位点 (rbcL和trnL-F) 和一个核核核糖核序列 (26S) 来进行基因组学重建.
- 贝叶斯分子时钟约会以估计分离时间.
- 基于遗传学结果的形态特征进化跟踪.
主要成果:
- 艾托尼亚系被证实是单的,有五个得到良好支持的分类被确定:Asterellopsis-Cryptomitrium,Calasterella,Mannia,Reboulia-Plagiochasma和Asterella.
- 阿斯特雷拉属进一步分为五个类,其中阿斯特雷拉palmeri被确定为Asterellopsis grollei的姐妹.
- 分子时钟的约会表明,分歧事件发生在白纪期间,Asterellopsis大约在84.2万年前分化,Calasterella大约在143万年前起源.
结论:
- 这项研究为Aytoniaceae提供了一个强大的遗传学框架,澄清了家族关系和进化途径.
- 祖先的Aytoniaceae被重建为缺乏伪和赤道开口,在主要上有生殖器官.
- 一个新的亚属,Asterella亚属. 建议Lindenbergianae,而Asterella palmeri则被转移到Asterellopsis.属中.
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