1. Department of Food Science and Nutrition, Kyungpook National University, Daegu 702-701, Republic of Korea.
2. Division of Plant Biosciences, Kyungpook National University, Daegu 702-701, Republic of Korea. Corresponding author. Phone: +82-53-950-5713. Fax: +82-53-950-6880. E-mail: leesc@knu.ac.kr