Chloroplast DNA phylogeography of Photinia glabra (Rosaceae) in Japan
Chloroplast DNA phylogeography of Photinia glabra (Rosaceae) in Japan
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DOI：
10.3732/ajb.93.12.1852
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发表时间：
2006-12-01
影响因子：
3
通讯作者：
Murakami, Noriaki
中科院分区：
文献类型：
--
作者：
Aoki, Kyoko;Matsumura, Toshikazu;Murakami, Noriaki
冰川时期的气候变化对植物物种的地理分布产生了重大影响。为了阐明一个分离分布的植物物种的进化历史，我们研究了生长在日本常绿阔叶林中的光石楠（蔷薇科）cpDNA单倍型的地理分布模式。我们在包括Kinki及其周边地区和天草群岛的分离区域在内的地理范围内取样了42个种群的cpDNA。这两个区域都有独特的cpDNA单倍型。此外，AMOVA显示，这些地区之间的差异可以解释总方差的很大一部分（51%,P < 0.001）。这些结果表明，在第四纪冰期，该植物物种过去分裂为两个独立的避难所：九州西南部和近畿，包括周围地区。一个特别有趣的结果是，在天草群岛南部的不相交分布中，遗传细分（Phi(CT)=1.00, P < 0.001）似乎位于来自几乎相邻的岛屿的种群之间，这些岛屿位于大约80至150米宽的球道之间。
Climate changes during glacial periods have had significant effects on the present geographic distribution of plant species. To elucidate the evolutionary history of a plant species with a disjunctive distribution, we investigated the geographic distribution patterns of cpDNA haplotypes in Photinia glabra (Rosaceae) growing in broadleaved evergreen forests in Japan. We examined cpDNA in 42 populations of P. glabra sampled over a geographic range that included Kinki and its surrounding areas and the disjunctive regions in the Amakusa Islands. Both areas had unique cpDNA haplotypes. Moreover, the AMOVA revealed that a large proportion of the total variance (51%, P < 0.001) could be explained by differences among these regions. These results suggest a past fragmentation of this plant species into two separate refugia: southwestern Kyushu and Kinki, including the surrounding area, during the Quaternary glacial periods. A particularly interesting result was that in the southern disjunct distribution in the Amakusa Islands, the genetic subdivision (Phi(CT)=1.00, P < 0.001) appears to lie between the populations from nearly contiguous islands located across a fairway only approximately 80 to 150 m in width.