Combining Ability for Early-maturity and Yield of Waxy Corn and Sweet Corn Inbred Lines
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Abstract
Estimating combining abilities and heterosis of inbred lines is imperative for selection of early-maturity and high yield of corn hybrids. The objective of this study was to study combining ability of waxy corn and sweet corn for earliness and high yield. The three sweet corn lines (early and moderate maturity) were use as females and crossed to the eight waxy corn lines (early, moderate and late maturity) as males using a North Carolina mating design II mating scheme to generate 24 hybrids. The 11 parental lines and their 24 crosses were evaluated in the dry season 2017-2018. The results of this study showed that the inbred lines 101LTSC-4, 101LTSC-10 and KVMON had negative and significant GCA effect for days to tassel and days to silk. Moreover, inbred lines 101LBW, Y.18 and C.13-1 had positive and significant GCA effect for husk ear weight. The hybrids 101LBW/KV3473, 101LTSC-4/H.NO.2 and 101LTSC-10/H.NO.2 had the early-moderate days to tassel and days to silk but they also had the high husk ear weight and highest positive significant SCA effects and high heterosis for this trait. These results indicated that the inbred lines developed from germplasm source from temperate area had the potential to improve early to moderate-maturity of waxy corn hybrid with high yield.
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