Large-scale analysis of combining ability and heterosis for development of hybrid maize breeding strategies using diverse germplasm resources

dc.creatorKanchao Yu
dc.creatorHui Wang
dc.creatorXiaogang Liu
dc.creatorCheng Xu
dc.creatorZhiwei Li
dc.creatorXiaojie Xu
dc.creatorJiacheng Liu
dc.creatorZhenhua Wang
dc.creatorYunbi Xu
dc.date2021-02-04T01:05:13Z
dc.date2021-02-04T01:05:13Z
dc.date2020
dc.date.accessioned2023-07-17T20:06:56Z
dc.date.available2023-07-17T20:06:56Z
dc.identifierhttps://hdl.handle.net/10883/21220
dc.identifier10.3389/fpls.2020.00660
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7513006
dc.descriptionUnderstanding combining ability and heterosis among diverse maize germplasm resources is important for breeding hybrid maize (Zea mays L.). Using 28 temperate and 23 tropical maize inbreds that represent different ecotypes and worldwide diversity of maize germplasm, we first developed a large-scale multiple-hybrid population (MHP) with 724 hybrids, which could be divided into three subsets, 325 temperate diallel hybrids and 136 tropical diallel hybrids generated in Griffing IV, and 263 temperate by tropical hybrids generated in NCD II. All the parental lines and hybrids were evaluated for 11 traits in replicated tests across two locations and three years. Several widely used inbreds showed strong general combining ability (GCA), and their derived hybrids showed strong specific combining ability (SCA). Heterosis is a quantifiable, trait-dependent and environment-specific phenotype, and the response of parental lines and their hybrids to environments resulted in various levels of heterosis. For all the tested traits except plant height and hundred grain weight (HGW), NCD II (temperate × tropical) hybrids showed higher average heterosis than the temperate and tropical diallel hybrids, with higher hybrid performance for ear length, ear diameter, and HGW. Tropical maize germplasm can be used to improve the yield potential for temperate lines. Grain number per row and grain number per ear were two most important traits that determined yield heterosis, which can be used as direct selection criteria for yield heterosis. The hybrids from heterotic groups, Reid × SPT, Reid × LRC, SPT × PA, and Lancaster × LRC, contributed highly significant positive SCA effects and strong heterosis to yield-related traits, and the heterotic patterns identified in this study were potentially useful for commercial maize breeding. Heterosis was more significantly and positively correlated with SCA than GCA, indicating that SCA can be used in heterosis prediction to develop potential hybrids in commercial maize breeding. The results of the present study not only contribute to developing breeding strategies, but also improve targeted breeding efficiency by using both temperate and tropical maize to broaden genetic basis. Large sets of parental lines with available genotypic information can be shared and used in worldwide hybrid breeding programs through an open-source breeding strategy. Potential applications of the reported results in developing hybrid maize breeding strategies were also discussed.
dc.languageEnglish
dc.publisherFrontiers
dc.relationhttps://figshare.com/collections/Large-Scale_Analysis_of_Combining_Ability_and_Heterosis_for_Development_of_Hybrid_Maize_Breeding_Strategies_Using_Diverse_Germplasm_Resources/5001416
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dc.rightsOpen Access
dc.source11
dc.source1664-462X
dc.sourceFrontiers in Plant Science
dc.source660
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectMultiple-Hybrid Population
dc.subjectHeterotic Group
dc.subjectMAIZE
dc.subjectHYBRIDS
dc.subjectHETEROSIS
dc.subjectCOMBINING ABILITY
dc.titleLarge-scale analysis of combining ability and heterosis for development of hybrid maize breeding strategies using diverse germplasm resources
dc.typeArticle
dc.typePublished Version
dc.coverageSwitzerland


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