Speciation process of Salvia isensis (Lamiaceae), a species endemic to serpentine areas in the Ise-Tokai district, Japan, from the viewpoint of the contradictory phylogenetic trees generated from chloroplast and nuclear DNA

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  • Speciation process of Salvia isensis Lamiaceae a species endemic to serpentine areas in the Ise Tokai district Japan from the viewpoint of the contradictory phylogenetic trees generated from chloroplast and nuclear DNA
  • 葉緑体DNAと核DNAから構築した系統樹の矛盾からみた伊勢-東海地方の蛇紋岩地帯の固有種,シマジタムラソウ(シソ科)の種分化過程

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To understand the speciation process of Salvia isensis (Lamiaceae), a species endemic to a special environment (serpentine areas in the Ise-Tokai district, central Honshu, Japan), chloroplast DNA (cpDNA) and nuclear ribosomal DNA (nrDNA) were employed to analyze the phylogenetic relationships of S. isensis with related species in Japan. Allozymic polymorphisms were also used to analyze genetic relationships among Salvia species. A contradiction in the phylogenetic positions of species studied was detected when phylogenetic trees were constructed using cpDNA or nrDNA, i.e., S. isensis was a sister to the other species in phylogenetic trees generated from cpDNA, while S. japonica was a sister to the other species in the case of nrDNA. Genetic relationships between Salvia species estimated from allozymic polymorphisms did not contradict to the topology for nrDNA. Using the present results, the speciation process of S. isensis is discussed with regard to introgressive gene exchanges between related species.

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