Genetic diversity of fragmented populations of Polygala reinii (Polygalaceae), a perennial herb endemic to Japan
Genetic diversity of fragmented populations of Polygala reinii (Polygalaceae), a perennial herb endemic to Japan
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DOI：
10.1007/s10265-004-0167-1
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发表时间：
2004-08
影响因子：
2.8
通讯作者：
M. Nakagawa
中科院分区：
文献类型：
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作者：
M. Nakagawa
对日本本州中部特有的多年生草本植物远志(Polygala Reinii)14个居群10个等位酶座位的遗传变异进行了分析。种内(P=80.0，A=3.10，HE=0.303)和种群内(P=42.1，A=1.6 1，HE=0.163)的遗传变异水平明显高于其他特有植物或短命多年生草本植物的平均值。居群间的遗传分化也很高(Gst=0.404)。遗传距离表型图倾向于显示种群的聚集性，反映了物种范围的碎片化。主成分分析显示了同样的趋势，东海地区、Kii半岛和Kinki北部地区的三组人口也是如此。群体间基因流动水平与地理距离呈负相关(r=−0.745，P<；0.0001)。这些结果表明INP群体间的基因流动有限。Reinii，可能是由于地理上的孤立伴随着零散的分布。另一方面，还发现了日本海和太平洋两侧的地理分异。Reinii，表明冰后迁徙对该物种遗传结构的建立的影响。
Genetic variation at 10 allozyme loci was analyzed in 14 populations ofPolygala reinii(Polygalaceae), a perennial herb endemic to central Honshu, Japan, with a fragmented geographical distribution. The levels of genetic variation within species (P=80.0,A=3.10,HE=0.303) and within populations (P=42.1,A=1.61,HE=0.163) were considerably higher than the mean for other endemic plants or short-lived perennial herbs. Genetic differentiation among populations was also high (GST=0.404). The genetic distance phenogram tended to show a clustering of the populations reflecting the fragmentation of the species range. A principal component analysis revealed the same tendency, as well as three groupings of populations in the Tokai district, on the Kii Peninsula and in the northern Kinki district. A negative correlation was obtained between the levels of gene flow and geographical distance among the populations (r=−0.745,P<0.0001). These results indicated limited gene flow among populations inP. reinii, presumably due to the geographical isolation accompanying the fragmented distribution. On the other hand, the geographical differentiation between the Japan Sea and Pacific Ocean sides was found inP. reinii, suggesting the influence of postglacial migration on the establishment of the genetic structure of this species.