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*Chul Soo Park
Department of Crop Science and Biotechnology, Chonbuk National University, Jeonju, 561-756, Korea
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Chon-Sik Kang
National Institute of Crop Science, RDA, Suwon 441-857, Korea
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Sun-Hee Woo
Department of Crop Science, Chungbuk National University, Cheongju 361-763, Korea