Plant Diversity and Evolution
Research Groups
Group of Wild Plant ScienceStaff
Research Topics
Natural variation and evolution of plants
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Earth is home to over 270,000 known species of plants. This diversity of plants has been shaped mainly through adaptive evolution to various environments, including abiotic as well as biotic ones. We are interested in understanding the global plants’ diversity. We specifically examine mechanisms of adaptive evolution that proceed in natural populations of plants. In addition to such basic research on natural history, we preserve and distribute wild plant seed resources.
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Study on taxonomic reevaluation and conservation of wild plants
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The plant taxonomic systems based on morphology had often disagreed with the molecular phylogenetic trees. Taxonomic reevaluations have advanced based on morphology and molecular phylogeny on family Asparagaceae, Tofieldiaceae, Dioscoreaceae, Cyperaceae, etc.
To conserve local populations of endangered plant species (Rumex nepalensis, etc.) in Okayama and adjacent area, their fluctuation and hybridization (genetic disturbance) have been investigated. For ex-situ conservation, frozen seeds from the local populations have been preserved.
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Genetic Resources of Wild Plants
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About 17,000 frozen seed accessions of 3,500 wild plant species from wild populations are available for scientific studies. Those are not guaranteed for survival rate. Exchanging MTA is needed before using the seeds. An herbarium is also available for studies on weekdays. About 80,000 specimens of 6,000 wild plant species from Japan and other countries have been preserved under APG system. They include various weeds from the world, naturalized plants in Japan, endangered species, plants of Ryukyu, and so on. About 30,000 dried seed specimens are also available. Please mail to junyama@okayama-u.ac.jp to access the genetic resources and herbarium.
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Publication List
- Ikeda H, Suzuki T, Oka Y, Gustafsson LAS, Brochmann C, Mochizuki N, Nagatani A (2021) Divergence in red light responses associated with thermal reversion of PHYTOCHROME B between high- and low-latitude species. New Phytologist. Accepted.
- Ikeda H, Yakubov V, Barkalov V, Sato K, Fujii N (2020) East Asian origin of the widespread alpine snow‐bed herb, Primula cuneifolia (Primulaceae), in the northern Pacific region. Journal of Biogeography. 47.2181-2193.
- Ikeda H, Yakubov V, Barkalov V, Setoguchi H(2018) Postglacial East Asian origin of the alpine shrub Phyllodoce aleutica (Ericaceae) in Beringia. Journal of Biogeography 45.1261-1274.
- Ikeda H, Eidesen P, Barkalov V, Yakubov V, Brochmann C, Setoguchi H (2017) Late Pleistocene origin of the entire circumarctic range of the arctic-alpine plant Kalmia procumbens. Molecular Ecology 26: 5773-5783.
- Takaishi, A., Kozhevnikov, A.E., Kozhevnikova, Z.V., Ikeda, H., Fujii, N. and Soejima, A. Phylogeography of Pulsatilla cernua (Ranunculaceae), a grassland species, in Japan. Ecology and Evolution 9: 7262-7272. (2019. 6.)
- Noda, H., Fuse, S., Yamashita, J., Pooma, R., Poopath, M., Tobe, H. and Tamura, M. N. 2020. A revised infrageneric classification of Old World species of Dioscorea (Dioscoreaceae). Acta Phytotaxonomica et Geobotanica 71(3): 187-199.
DOI: 10.18942/apg.202003 - Noda, H., Yamashita, J., Fuse, S., Pooma, R., Poopath, M., Tobe H. and Tamura, M. N. 2020. A large-scale phylogenetic analysis of Dioscorea (Dioscoreaceae), with reference to character evolution and subgeneric recognition. Acta Phytotaxonomica et Geobotanica 71(2): 103-128.
DOI: 10.18942/apg.201923 - Hada, Y., Enomoto, T., Kariyama, S., Yamashita, J. et al. 2020. Red data book of Okayama prefecture 2020, plants. 368pp. Okayama Pref.
- Shimono, A., Kanbe, H., Nakamura, S., Ueno, S., Yamashita, J. and Asai, M. 2020. Initial invasion of glyphosate-resistant Amaranthus palmeri around grain-import ports in Japan. Plants, People, Planet 2(6): 640-648.
DOI: 10.1002/ppp3.10156 - Oda, J., Fuse, S., Yamashita, J. and Tamura, M. N. 2019. Phylogeny and taxonomy of Carex (Cyperaceae) in Japan I. C. sect. Rarae. Acta Phytotaxonomica et Geobotanica 70(2): 69-85.