| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Hybridization in plants is now considered as one of the important factor which
promotes speciation. We examined reticulate evolution in the genus Salix, by investigating phylogenetic relationships among Japanese willow species in the subgenus Vetrix and Chamaetia based on multiple nuclear genes. Phylogenetic network analysis did not support the hypothesis for diploid hybrid speciation of S. hukaoana which had been suspected of being derived from diploid hybrid between S. gracilystyla and S. rorida, although the phylogenetic incongruence in a few loci suggested introgression among them after speciation. In contrast, the other species displayed more complex evolutionary histories including reticulate events, and suggested that reticulate evolution has occurred extensively in the genus Salix.
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