1. Department of Biology, Dongguk University, Seoul 100-715, Korea.
2. Division of Applied Plant Sciences, Kangwon National University, Chuncheon 200-701, Korea.
3. Department of Biology, University of Incheon, Incheon 402-749, Korea.
4. Department of Biology, Korea National University of Education, Cheongwon 363-791, Korea.
5. Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Beijing 100094, P. R. China.