作为Brassica和亲属 (Brassiceae部落) 的分类学分类标记物,中多多多多多多多多多多
Shawn K Thomas1,2, R Shawn Abrahams3, Daniel Robert Kick4,5
1Division of Biological Sciences, University of Missouri, Columbia, MO 65211, USA.
Annals of botany
|August 2, 2025
概括
布拉西卡氏族不分享古老的全基因组三倍化 (WGT) 事件,称为Br-α WGT. 这一发现需要对Brassiceae部落进行分类学修订,以澄清末作物的进化.
科学领域:
- 植物基因组学 植物基因组学
- 进化生物学是进化的生物学.
- 人类遗传学 是一个学科.
背景情况:
- 全基因组复制 (WGD) 在开花植物中很常见.
- 据假设,Brassicaceae家族,包括Brassica作物,共享一个古老的 mesohexaploidy (Br-α WGT).
- 这个群体内的Br-α WGT的确切基因范围以前是未定义的.
研究的目的:
- 确定Br-α WGT.的遗传学界限和进化时间.
- 为了澄清Brassicaceae家族的进化历史,特别是Brassiceae部落.
- 根据基因组证据,为布拉西氏族提出修订后的分类学.
主要方法:
- 遗传学分析被用来重建进化关系.
- 对迄今为止的关键进化事件进行了分歧时间估计.
- 进行了塑体和核基因组的比较分析,以评估WGT模式.
主要成果:
- 遗传学分析揭示了塑树和核树的相互矛盾信号,这些信号归因于多体化和网状物进化.
- 布拉西系 (Brassiceae) 部落在塑体和核细胞系中被证实为单体.
- 发现B-α WGT不是整个布拉西氏族共享的;排除的属包括Orychophragmus和Sinalliaria.
- 估计Br-α WGT发生在1210万年前至1070万年前之间.
结论:
- Br-α WGT 不是目前定义的整个布拉西系的特征.
- 建议对Brassiceae部落进行新的分类学修订,基于Br-α WGT的存在或不存在.
- 这种基于基因组的分类提供了一个比以前基于形态的系统更稳定的分类学框架.
- 这些发现解决了长期存在的分类学模两可,并阐明了末作物及其亲属的进化历史.
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