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主要夜系的晚白纪起源来自总证据时间树分析
Ixchel S González-Ramírez1,2, Rocío Deanna3, Stacey D Smith3
1University and Jepson Herbaria and Department of Integrative Biology, University of California, Berkeley, CA 94720, USA.
Annals of botany
|March 12, 2026
概括
夜家族 (Solanaceae) 起源于大约9800万年前,比以前的估计要古老得多. 这项研究使用化石和分子数据来完善Solanaceae多样化的进化时间表.
科学领域:
- 植物学 植物学
- 进化生物学 进化生物学
- 古生物学的古生物学
背景情况:
- 夜家族 (Solanaceae) 的进化历史和多样化时间仍然存在争议,其冠冕年龄的估计差异很大.
- 之前的研究由于化石证据有限而面临挑战,这影响了果和烟草等主要品种的多样化速度的解决.
研究的目的:
- 用最近发现的化石和先进的基于模型的遗传学方法,重新评估Solanaceae内部的分歧时间.
- 同时推断进化时间线,并确定关键的化石水果和种子在家族中的家族遗传位置.
主要方法:
- 组建了一个全面的全家族形态数据集 (17个分类,8个连续字符) 对于134个现存和14个化石Solanaceae种类.
- 整合了现存种群的序列数据,并实施了贝叶斯总证据约会分析,在RevBayes.Bayes中使用化石化出生死亡模型.
- 采用了分子和形态进化的时间均和时间异质模型,以解释家族遗传不确定性.
主要成果:
- 据估计,Solanaceae的起源大约在9800万年前,主要的血统分裂发生的时间大约是以前认为的三倍.
- 14种化石种群的家族遗传分类在信心上有所不同,但一个特定的水果化石和一个种子化石得到了强烈的支持.
- 大多数化石,即使是那些没有精确位置的化石,也被自信地分配给Solanaceae中的大果类.
结论:
- 这项研究证明了复杂的模型和精心策划的数据集在解决进化时间和计算族系遗传不确定性的有用性.
- 提出的时间树为未来对Solanaceae的研究提供了强大的时间框架,包括比较基因组学,多样化模式,特征进化和生物地理学.
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