title: Identification of heterotic loci associated with grain yield and its components using two CSSL test populations in maize.
abstract: Heterosis has widely been used to increase grain yield and quality. In this study, the genetic basis of heterosis on grain yield and its main components in maize were examined over 2 years in two locations in two test populations constructed from a set of 184 chromosome segment substitution lines (CSSLs) and two inbred lines (Zheng58 and Xun9058). Of the 169 heterotic loci (HL) associated with grain yield and its five components identified in CSSL × Zheng58 and CSSL × Xun9058 test populations, only 25 HL were detected in both populations. The comparison of quantitative trait loci (QTLs) detected in the CSSL population with HL detected in the two test populations revealed that only 15.46% and 17.35% of the HL in the given populations respectively, shared the same chromosomal regions as that of the corresponding QTLs and showed dominant effects as well as pleiotropism with additive and dominant effects. In addition, most of the HL (74.23% and 74.49%) had overdominant effects. These results suggest that overdominance is the main contributor to the effects of heterosis on grain yield and its components in maize, and different HL are associated with heterosis for different traits in different hybrids.
authors.affiliation: College of Agriculture and Biotechnology, Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China.|Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.
authors.forename: Hongqiu
authors.initials: H
authors.lastname: Wang
authors.affiliation: Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.
authors.forename: Xiangge
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.
authors.forename: Huili
authors.initials: H
authors.lastname: Yang
authors.affiliation: Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Liu
authors.affiliation: Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.
authors.forename: Huimin
authors.initials: H
authors.lastname: Li
authors.affiliation: Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.
authors.forename: Weihua
authors.initials: W
authors.lastname: Li
authors.affiliation: Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Fu
authors.affiliation: Key Laboratory of Wheat and Maize Crops Science, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, China.|Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou, 434023, China.
authors.forename: Jihua
authors.initials: J
authors.lastname: Tang
authors.affiliation: College of Agriculture and Biotechnology, Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China.
authors.forename: Dingming
authors.initials: D
authors.lastname: Kang
mesh_terms: D002678:Chimera / Q000235:genetics* / Q000254:growth & development; D006823:Hybrid Vigor / Q000502:physiology*; D040641:Quantitative Trait Loci; D012639:Seeds / Q000235:genetics* / Q000254:growth & development; D003313:Zea mays / Q000235:genetics* / Q000254:growth & development