1. Vegetable Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration, 100, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do 55365, Korea
2. Deptartment of vegetable crops, Korea National College of Agriculture and Fisheries, Jeonju-si, Jeollabuk-Do 54874, Korea