Incongruence between Morphological and Molecular Traits in Populations of Viola violacea (Violaceae) in Yamagata Prefecture, Northern Honshu, Japan

概要

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Viola violacea is a morphologically variable and widely distributed species in Japan. Viola violacea var. violacea, distributed in western Japan, has narrowly ovate to widely lanceolate leaves, while V. violacea var. makinoi has lanceolate to narrowly lanceolate leaves and occurs in eastern Japan, but some populations of V. violacea var. violacea populations have been recorded in eastern Japan. Although the nature of these populations is obscure. We sought to uncover the origin of the disjunct V. violacea var. violacea-like populations in Yamagata Prefecture, Tohoku district by comparing leaf morphology, nuclear ribosomal DNA (nrDNA) ITS, and the trnL-trnF intergenic region of the chloroplast DNA (cpDNA). The leaf morphology of V. violacea var. violacea-like plants in Yamagata was identical to V. violacea var. violacea elsewhere, but the nrDNA ITS sequences of the Yamagata plants were more similar to V. violacea var. makinoi. This clear difference was not found in the cpDNA trnL-trnF region. The incongruity between leaf morphology and molecular traits may be due to V. violacea var. violacea populations that are more closely related to V. violacea var. makinoi or to intraspecific hybridization. To confirm these hypotheses, more extensive study is needed.
日本植物分類学会の論文
2013-04-05