옥수수의 응애 저항성에 대한 조합능력과 세대평균분석

Combining Ability and Generation Mean Analysis for Resistance to Mite in Corn

Two-spotted spider mite (Tetranychus urticae K.) can cause severe yield losses in maize (Zea mays L.). Diallel crosses (28 F₁) and generation mean analysis were analyzed to determine the type of resistance to mite. In diallel crosses, Mean square for GCA effects were 8.6 times greater than that of SCA effects. This result indicated that additive gene action is more important than non-additive gene action for mite resistance. In generation mean analysis, the estimates of three parameters showed non significant differences in the two crosses. Additive gene effects [a] were negative, while dominance gene effects [d] were positive in the two crosses. It was observed that additive gene effects were greatly important than dominance gene effects for mite resistance.