1 Department of Horticultural Science, College of Industrial Sciences, Kongju National University, 1 Daehoe-ri, Yesan-kun, Chungnam, 340-720, Korea.
2 Department of Genetic Engineering, Dong-A University, Busan 604-714, Korea.
3 Department of Crop Science, College of Agriculture and Life Sciences, Chungnam National University, 99 Daehangno, Yuseong-gu, Daejeon, 305-764, Korea.