种群变异(包括表型变异和遗传变异)及其分化式样是种群遗传学与进化生物学研究的核心内容之一。距离隔离(Isolation by distance, IBD)一直被认为是驱动种群分化的主要因子。近年来,越来越多的研究表明生境异质性引起的局域适应(local adaptation)也会导致种群分化,即适应性隔离(Isolation by adaptation, IBA)o然而,很少有研究同时检验IBD和IBA对种群分化的影响。普通野生稻(Oryza rufipogon Griff.)是亚洲栽培稻的祖先种,广泛分布于亚洲的亚热带与热带区域的相互隔离的湿生或水生环境中,生境中生物因子与非生物因子在种群间存在差异,即生境异质性明显。这种生境异质性是否已导致局部适应性的发生、进而驱动种群分化却没有被研究过。本论文以普通野生稻为对象,通过同质园移栽实验、分子标记检测与高通量测序分析相结合的方法,研究普通野生稻种群表型与遗传变异及分化式样,探讨IBD与IBA在种群分化中的作用,以揭示普通野生稻种群变异分布格局的形成机制。主要结果如下:1)在海南三亚、广东茂名和江苏太仓三地分别建立同质园栽培实验检测了全世界72个种群1102份普...
【英文摘要】
Dissecting the variations in population (including morphological variations and genetic variations) and corresponding divergent patterns is one of the central topics in population genetics and evolutionary biology. Isolation by distance (IBD) was considered to be the main factor driving population divergence. Recently, a bench of researches indicated local adaptation due to heterogeneous habitats would lead to population divergence as well. However, few works had surveyed the combined effects of IBD and DBA...