Genetic basis of heterosis explored by simple sequence repeat markers in a random-mated maize population

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
H LuR Bernardo

Abstract

The genetic basis of heterosis in crop plants has not been completely resolved. Our objective in this study was to determine the level of dominance for quantitative trait loci (QTLs) that underlie heterosis in maize (Zea mays L.). An F2 population of an elite maize single cross, LH200 x LH216, was random mated for three generations in an attempt to break up repulsion linkages that might lead to pseudo-overdominance. The population was analyzed with 160 simple-sequence repeat markers. Phenotypic data analyses indicated overdominance for grain yield and partial dominance for plant height, grain moisture and stalk lodging. A total of 28 QTLs were identified for grain yield, 16 for grain moisture, 8 for stalk lodging, and 11 for plant height. For grain yield, 24 QTLs (86%) showed overdominance. In contrast, most of the QTLs for plant height, grain moisture and stalk lodging showed partial to complete dominance. Little epistasis was detected among the QTLs for any of the traits. Our results can be interpreted in one of two ways, or a combination of both: (1) QTLs for grain yield in maize exhibit true overdominance, or (2) QTLs for grain yield show partial to complete dominance, but they are so tightly linked such that three generati...Continue Reading

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Citations

Oct 21, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Robenzon E Lorenzana, Rex Bernardo
Nov 6, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Alexander ThiemannStefan Scholten
Nov 17, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Albrecht E MelchingerXuefei Mi
Nov 17, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Chris C SchönAlbrecht E Melchinger
Nov 26, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Jihua TangJiansheng Li
Sep 29, 2011·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Elisabetta FrascaroliPierangelo Landi
Jan 20, 2009·Molecular Genetics and Genomics : MGG·Giorgio PeaElisabetta Frascaroli
Sep 26, 2008·The Journal of Heredity·Iria Fernández-SilvaAntonio J Monforte
Sep 16, 2008·Genetics·Antonio Augusto Franco GarciaZhao-Bang Zeng
Apr 28, 2006·Proceedings of the National Academy of Sciences of the United States of America·Ruth A Swanson-WagnerPatrick S Schnable
Aug 30, 2006·Proceedings of the National Academy of Sciences of the United States of America·Yaniv SemelDani Zamir
Mar 23, 2012·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Marcio BalestreJúlio Sílvio de Sousa Bueno Filho
Nov 15, 2015·Plant Science : an International Journal of Experimental Plant Biology·Ana Karine MartinezSilvio Salvi
Dec 26, 2006·Trends in Genetics : TIG·Zachary B Lippman, Dani Zamir
Oct 7, 2015·Frontiers in Plant Science·Zhiwu DanYingguo Zhu
Jul 17, 2014·Journal of Applied Genetics·Donghui FuMin Zhang
Mar 24, 2018·Genetics, Selection, Evolution : GSE·Hadi EsfandyariAnders Christian Sørensen
Aug 25, 2015·Natural Computing·Ewa Gajda-ZagórskaDavid Pardo
Jun 15, 2019·Plant Biotechnology Journal·Hongjun LiuXuehui Huang

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