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Genetic Analyses for Yield Components and Heterosis in Maize Elite Inbred Lines
옥수수 유망 자식계통들에 대한 잡종강세 및 수량관련 형질의 유전분석
Korean J. Breed. Sci. 2015;47(4):345-356
Published online December 31, 2015
© 2015 Korean Society of Breeding Science.

Jong Yeol Park1,2, Su Yeon Woo1, Kyu Jin Sa1, and Ju Kyong Lee1*

1Division of Bio-resource Sciences, College of Agriculture and Life Science, Kangwon National University, Chuncheon 24341, Korea2Maize Experiment Station, Kangwon Agricultural Research and Extension Services, Hongcheon 25160, Korea
1강원대학교 농업생명과학대학 생물자원과학부, 2강원도 농업기술원 옥수수연구소
Grain yield, agronomic traits, and correlation between genetic distance of 36 F1 hybrids produced by half-diallel crosses using nine maize inbred lines were analyzed. In the analyses of F1 hybrids and their mid-parent heterosis (MPH) for agronomic traits, grain yield showed highest MPH value of 156%. One-hundred kernel weight showed the lowest value of 7%. In addition, when genetic distance based on agronomic traits was estimated, parental inbred lines did not agree with their own pedigree. Therefore it had the limitation to estimate genetic distance using agronomic traits. In this study, 92 SSR markers were used to calculate genetic distance at DNA level. However we did not confirm their own pedigree of nine parental inbred lines. There was no correlation between grain yield and SSR markers. Therefore molecular marker selection was conducted in relation with grain yield by the step-by-step method using 92 SSR markers. The selected nine SSR markers showed a significant positive correlation (r2=0.703**) between grain yield and SSR markers. The correlations between the selected SSR markers and agronomic traits of ear length, ear width, plant height, and ear height were particularly showed positively correlated. The nine SSR markers selected in this study would help predicting heterosis and planning crosses for hybrids in maize breeding programs.
Keywords : Maize, Agronomic traits, F1 hybrid, Cross combination, SSR marker

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