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Combined Dominance and Additive Gene Effects in Trait Inheritance of Drought-Stressed and Full Irrigated Popcorn

Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias (CCTA), Universidade Estadual do Norte Fluminense Darcy Ribeiro—UENF, Campos dos Goytacazes 28013-602, Brazil
Empresa Brasileira de Pesquisa Agropecuária, Centro Nacional de Pesquisa de Milho e Sorgo, Sete Lagoas 35701-970, Brazil
Author to whom correspondence should be addressed.
Agronomy 2019, 9(12), 782;
Received: 8 October 2019 / Revised: 15 November 2019 / Accepted: 19 November 2019 / Published: 21 November 2019
(This article belongs to the Section Crop Breeding and Genetics)
To define breeding strategies, the understanding of trait inheritance is critical. The objective of this study was to determine the inheritance of popcorn under different water regimes. To this end, Hayman’s diallel methodology was used, with 8 parents and 28 hybrids. The experiment was carried out under well-watered conditions (WW) and water stress (WS). For popping expansion (PE) under both water regimes, the effects of complete dominance and greater importance of the components associated with the dominance effects were observed. In contrast, the number of dominant genes was zero and the determination coefficient in the narrow sense was >50%; additive effects were also present. For the number of grains per row (GR), ear length (EL), and grain yield (GY) under WS and WW conditions, the dominance effects were the most relevant, and the mean degree of dominance with overdominance effects and greatest relevance of the components associated with this effect were also observed. The same breeding methods can be applied under the studied WS and WW conditions. Exploiting heterosis for GY and related components is a promising way to adapt popcorn to WS. To be able to capitalize on additive and dominance effects, a reciprocal recurrent selection is recommended. View Full-Text
Keywords: diallel; Hayman; drought tolerance; dominance; additivity diallel; Hayman; drought tolerance; dominance; additivity
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Lima, V.J.; Amaral Júnior, A.T.; Kamphorst, S.H.; Bispo, R.B.; Leite, J.T.; Santos, T.O.; Schmitt, K.F.M.; Chaves, M.M.; Oliveira, U.A.; Santos, P.H.A.D.; Gonçalves, G.M.B.; Khan, S.; Guimarães, L.J.M. Combined Dominance and Additive Gene Effects in Trait Inheritance of Drought-Stressed and Full Irrigated Popcorn. Agronomy 2019, 9, 782.

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