Past and present dynamics of sorghum and pearl millet diversity in Mount Kenya region

Crop populations in smallholder farming systems are shaped by the interaction of biological, ecological and social processes, occurring on different spatiotemporal scales. Understanding these dynamics is fundamental for the conservation of crop genetic resources. In this paper we investigated the processes involved in sorghum and pearl millet diversity dynamics on Mount Kenya. Surveys were conducted in ten sites distributed along two elevation transects and occupied by six ethnolinguistic groups. Varieties of both species grown in each site were inventoried and characterized using SSR markers. Genetic diversity was analyzed using both individual and population based approaches. Surveys of seed lot sources allowed characterizing seed-mediated gene flow. Past sorghum diffusion dynamics were explored by comparing Mount Kenya sorghum diversity with that of the African continent. The absence of structure in pearl millet genetic diversity indicated common ancestry and/or important pollen and ...小农户耕作体系中的作物种群，受不同时空尺度下生物、生态与社会过程的交互作用共同塑造。明晰此类动态变化，对于作物遗传资源的保护而言至关重要。本研究针对肯尼亚山地区高粱与珍珠粟的多样性动态相关过程展开探究。研究沿两条海拔样带布设了10个采样点，覆盖6个民族语言群体的聚居区。针对各采样点种植的两种作物品种开展了编目，并利用简单序列重复（Simple Sequence Repeat, SSR）标记进行特征分析。研究同时采用基于个体与基于种群的分析方法，对遗传多样性展开解析。通过对种子批次来源的调查，明确了种子介导的基因流特征。通过将肯尼亚山地区的高粱多样性与非洲大陆整体的高粱多样性进行对比，探究了历史上高粱的扩散动态。珍珠粟遗传多样性未呈现群体结构，这表明其具有共同的祖先，或是存在频繁的花粉介导以及……