Quantitative Trait Loci Mapping for Flowering and Yield-related Traits with a Recombinant Inbred Line Population of Maize (Zea mays L.)

초록

In this study, a total of 80 F-7:8 recombinant inbred lines (RIL), derived from a cross between dent corn inbred line, Mo17 and waxy inbred line KW7, were evaluated for 11 flowering and yield-related traits. Correlation analysis was performed among the 11 flowering and yield-related traits. DA showed the highest correlation with DS (0.747**). DS via ASI (0.619**), TC via SC (0.595**), CB via ER (0.535**) showed relatively high correlation coefficients than the other trait combinations. Quantitative trait loci (QTL) and epistatic interactions were detected for 11 flowering and yield-related traits. Our study detected a total of 32 QTLs and 40 epistatic interactions for 11 flowering and yield-related traits. The 15 QTLs were major QTLs which had more than 15% phenotypic variation (16.29 similar to 82.45%). qKT9 had the highest phenotypic variance (82.45%) in marker interval between umc1634 and wx1. The qDS1a and qASI1a were co-located within a region flanked by two adjacent SSR markers on chromosome 1 (umc1354 and bnlg1179) and qDS1b and qASI1b were co-located within a region flanked by two adjacent SSR markers on chromosome 1 (umc1166 and umc1976). In addition, two QTLs, qCB3 and qDA3 shared umc1949 and Two QTL, q10V5 and qDS5 also shared umc2373. Another QTL, qER10 and qASI10 shared umc1645. This tight link supported high correlation of each trait. Finally, these SSR marker pairs are useful selection tools for screening flowering and yield related traits. To perform MAS efficiently, it is important to identify genes or traits on the chromosomal segment linked to the target gene. Thus, the detection and confirmation of loci associated with main agronomic traits presented may provide greater opportunities for maize breeders to improve quality with marker associated selection.

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