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环境压力塑造了棉花土地品种中遗传多样性和祖先的区域模式
Avinash Shrestha1, Maximus A Gudino1, Rosalyn B Angeles-Shim1
1Department of Plant and Soil Science, Davis College of Agricultural Sciences and Natural Resources, Texas Tech University, Lubbock, TX, United States.
Frontiers in plant science
|December 8, 2025
概括
棉花陆地种保留了在化过程中丢失的宝贵遗传多样性. 这些传统的基因库为改善现代棉花的弹性,适应性和纤维特征提供了尚未开发的潜力.
科学领域:
- 遗传学和基因组学 遗传学和基因组学
- 植物育种 植物育种
- 进化生物学 进化生物学
背景情况:
- 高地棉花 (G. hirsutum) 的育种改善了纤维特征,但缩小了其遗传基础.
- 传统的陆地品种可能保留了现代品种中丢失的关键遗传多样性.
- 了解土地品种的多样性是未来作物改进的关键.
研究的目的:
- 在棉花土地品种和品种中描述种群结构,植物遗传关系和选择特征.
- 识别陆地品种内有价值的遗传区域,以便在繁殖计划中潜在使用.
- 为棉花前育种和保护工作提供框架.
主要方法:
- 全基因组SNP基因定型全球面板的棉花地产品种和精英品种.
- 使用STRUCTURE和邻居连接方法进行人口结构分析.
- 基因组扫描用于选择特征 (Tajima的D) 和遗传距离估计 (Nei的,FST).
主要成果:
- 确定了四个祖先种群和九个主要集群,土地种形成了深厚的,区域连贯的血统.
- 在中美洲/中美洲陆地种和现代繁殖系之间观察到强烈的遗传差异.
- 检测到独特的基因组选择特征:在陆地品种中平衡选择/祖先多态性和在品种中选择性扫描,特别是在花期附近的基因.
结论:
- 棉花土地品种拥有独特的遗传资源,包括在现代品种中丢失的地区.
- 这些土地品种是提高棉花弹性,适应性和纤维质量的重要储备.
- 这项研究提供了一个高分辨率的框架,用于在种植G. hirsutum.的前繁殖和保护中利用陆地品种的多样性.
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