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花苜蓿小尺度空间遗传结构研究

Fine-scale genetic structure of Medicago ruthenica Trautv.

  • 摘要: 以花苜蓿(Medicago ruthenica Trautv.)为材料,在内蒙古克什克腾旗建立两个25 m×50 m的样方(山谷YF1和山坡YF2),采集该范围内的所有个体,利用8对SSR分子标记对其遗传变异特性进行分析。结果显示,克什克腾旗花苜蓿居群遗传多样性较高。两个居群个体的空间自相关分析结果表明,9 m内的个体间为非随机邻近交配,且在同距离范围内,山谷居群的个体间遗传相似性更低,推测此区域可能是历史和地理因素塑造了花苜蓿丰富的遗传多样性,两个小尺度空间格局的个体间基因流模式主要受地形影响。

     

    Abstract: We established two quadrats (25 m×50 m) in a valley (YF1) and on a hillside (YF2) in Keshiketeng Banner, Inner Mongolia. We sampled all Medicago ruthenica Trautv. individuals in the quadrats by fine-scale methods and characterized their genetic variation using eight pairs of simple sequence repeat (SSR) primers. We found that M. ruthenica had a high level of genetic diversity. Based on spatial autocorrelation, the individuals showed non-random adjacent mating at an interval of 9 m. At the same interval, we found lower genetic similarity in the YF1 population than in the YF2 population. Thus, we inferred that the rich genetic diversity of M. ruthenica might be shaped by historical and geographic factors in this area, with topography impacting gene flow patterns between the two fine-scale populations.

     

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