1. Department of Horticulture, Kangwon National University, Chuncheon 200-701. Korea
2. Department of Medical Biotechnology, Kangwon National University, Chuncheon 200-701, Korea
3. Department of Controlled Agriculture, Kangwon National University, Chuncheon. Korea
4. Department of Plant and Food Sciences, Sangmyung Univ.Cheonan 330-720, Korea