Evaluation of Maize Downy Mildew using Spreader Row Technique
2016
Kim, K.H., Dongguk University-Seoul, Seoul, Republic of Korea | Moon, J.C., Kangwon National University, Chuncheon, Republic of Korea | Kim, J.Y., Korea University, Seoul, Republic of Korea | Kim, H.C., Dongguk University-Seoul, Seoul, Republic of Korea | Shin, S., Dongguk University-Seoul, Seoul, Republic of Korea | Song, K., Dongguk University-Seoul, Seoul, Republic of Korea | Baek, S.B., NICS, RDA, Suwon, Republic of Korea | Lee, B.M., Dongguk University-Seoul, Seoul, Republic of Korea
This study was conducted to evaluate maize downy mildew resistance using spreader row technique in Cambodia. A total of forty maize lines were used in this experiment. Seven Korean varieties and seven breeding lines showed high infection rates (80~100%) and highly susceptible (HS) to downy mildew disease in both spring and fall. Also most of nested association mapping (NAM) parent lines were highly susceptible (HS). Meanwhile three inbred lines, Ki3, Ki11, and CML228, showed highly resistant (HR) or resistant (R) in spring and moderately resistant (MR) in fall. These three lines were already known as resistant inbred lines against downy mildew disease. It appears that spreader row technique was suitable for selection of maize downy mildew resistance in Cambodia. The incidence of downy mildew was influenced by weather conditions, especially relative humidity and temperature. Among several inoculation methods to screen for downy mildew resistance, this spreader row technique is effectively and easily used in the field of Southeast Asia.
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