- KOREAN
- P-ISSN2287-8327
- E-ISSN2288-1220
- SCOPUS, KCI
ISSN : 2287-8327
Fine-scale initiation of non-native Robinia pseudoacacia riparian forests along the Chikumagawa River in central Japan
Taizo Hogetsu (Graduate School of Agricultural and Life Sciences,University of Tokyo)
Abstract
Robinia pseudoacacia has become invasively naturalized in Japan. We investigated the role of sexual reproduction in thedevelopment of R. pseudoacacia riparian forests along the Chikumagawa River in Japan, by using five chloroplast (cpSSR)and seven nuclear (nSSR) markers. We identified eight chloroplast haplotypes and 147 nuclear genotypes from 619 R. pseudoacacia trees sampled in three plots (Plots A, B, and C) and along two line transects (Lines D and E). CpSSR analysesshowed that multiple maternal lines were distributed along the river, and that some haplotypes from different populationsoverlapped. In addition, while Plots A and B were separated by a short distance, only these two plots exhibitedgenetic differentiation in the haplotypes. In the nSSR analysis, all pairwise FST values among the three plots were significantlydifferent from zero. Kinship analysis based on nSSR markers revealed that kinship connected many individuals toanother individual from the same plot. These results indicate that seed dispersal near to mother trees contributes to thefine-scale genetic structure of R. pseudoacacia riparian forests. Our results indicate that sexual reproduction, in additionto asexual reproduction, is a major contributor to the fine-scale formation of R. pseudoacacia forests.
- keywords
- exotic tree species, invasion, riparian forest, Robinia pseudoacacia, sexual reproduction
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