- Council member, Japanese Society of Chromosome Science (2001- 2006)
- Committee member of International Conference of 'Evolutionary Botany of Certain Plant-Groups of the East Eurasian Floristic Element Related to Japanese Flora on the Basis of Chromosomes'(2004, Hiroshima)
- Committee member of 4th International Conference of Carnivorous Plant (2001, Tokyo).
- Committee member of 1st Annual Meeting, Japanese Society for Plant Systematics (2001, Tokyo).