1Department of Environmental Horticulture, The University of Seoul, Jeonnong-dong 90, Dongdaemun-gu, Seoul 130–743, South Korea.
2Phygen Inc., Bongmyeong-dong 692-6, Yuseong-gu, Daejeon 305-301, South Korea.
3Bioenergy Crop Research Center, National Institute of Crop Science, RDA, Muan, Jeonnam 534-833, South Korea.
4Department of Horticulture, Daegu University, Jillyang, Gyeongsan 712-714, South Korea.
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