植物遗传学分析表明,选择性物质糖 (Coniothyrium glycines) 代表了一种具有显著形态和遗传变异的单一物种
Rachel A Koch Bach1, Harun M Murithi2,3, Danny Coyne3
1Foreign Disease-Weed Science Research Unit, Agricultural Research Service, United States Department of Agriculture, Fort Detrick, Maryland 21702.
Mycologia
|September 17, 2024
概括
豆红叶斑 (RLB) 是由一种真菌物种,Coniothyrium glycines,尽管遗传多样性造成的. 这种对美国农业构成潜在威胁的病原体,呈现出明显的区域差异.
科学领域:
- 植物病理学 植物病理学
- 菌类学 菌类学是指菌类学.
- 进化生物学是进化的生物学.
背景情况:
- 豆红叶斑 (RLB) 是一种由Coniothyrium glycines引起的叶病,目前仅限于非洲.
- 由于其对美国植物健康的潜在威胁,C. glycines是一种选择性剂.
- 以前的研究表明了显著的分子多样性,这表明多种物种可能会导致RLB.
研究的目的:
- 为了确定多种Coniothyrium是否会导致大豆红叶斑.
- 为了重建C. glycines和相关物种的族系.
- 调查C. glycines.内部的遗传和形态多样性.
主要方法:
- 用四个基因的序列数据进行了家族遗传学分析.
- 包括来自六个非洲国家的33种C. glycines分离物.
- 分离物体的形态表征和祖先范围估计.
主要成果:
- 所有33个分离物形成了一个单一的,得到良好支持的C. glycines. monophyletic血统.
- 确定了六个不同的类型,主要与地理来源相关 (埃塞俄比亚,乌干达,南非).
- 来自埃塞俄比亚的分离物表现出明显的形态 (较大的硬化体,较小的皮cnidia).
- 在四个基因上进行的遗传学分析显示,分类之间没有一致性,证实了单一物种.
- 祖先范围估计表明C. glycines血统起源于非洲南部.
结论:
- 尽管观察到遗传和地理结构,但所有分析的分离物体都代表了一个物种,Coniothyrium glycines.
- 在C. glycines中存在显著的遗传和形态多样性,特别是在埃塞俄比亚的分离物中.
- 据估计,C. glycines的起源是在非洲南部.
- 了解这种多样性对于管理这种高后果的真菌病原体至关重要.
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