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Inheritance Study for Popping Expansion in Popcorn vs. Flint Corn Genotypes
Author(s) -
Coan Marlon Mathias Dacal,
Pinto Ronald José Barth,
Kuki Maurício Carlos,
Amaral Júnior Antônio Teixeira,
Figueiredo Alex Sandro Torre,
Scapim Carlos Alberto,
Warburton Marilyn
Publication year - 2019
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2019.04.0295
Subject(s) - germplasm , randomized block design , trait , inheritance (genetic algorithm) , biology , mixed model , interaction , zea mays , inbred strain , growing season , microbiology and biotechnology , agronomy , statistics , horticulture , mathematics , gene , genetics , computer science , programming language
Popcorn is a popular snack food with higher economic value compared to field corn varieties of maize ( Zea mays L.), but displays less favorable agronomic performance and greater susceptibility to diseases. The objective of the present work was to study the mode of inheritance of popping expansion (PE) from three different crosses of popcorn × flint corn with a classical model and a mixed model using inbred lines derived from tropical germplasm. The study will investigate if PE is encoded by one or two major genes, a few genes with large effect, or multiple genes of small effect. Four generations (P 1 and P 2 , F 1 , F 2 , BC 1‐Popcorn and BC 1‐Flint ) from each cross were evaluated in field experiments in the main growing season of 2013/2014, in two environments. A randomized complete block design was used, with a nested split‐plot arrangement of treatments with four replicates. Means of the four generations were determined for PE. A weighted least squares analysis of variance based on the generation means method was used to perform joint scaling tests on the data from each generation. Maximum likelihood estimators were used to test the effect of major genes and/or the presence of polygenic loci affecting the trait. Although inheritance studies with plot means can be used to estimate genetic effects, the effect numbers can be overestimated. In the current study, PE in popcorn vs. flint crosses was controlled by a major additive gene in conjunction with polygenic modifiers acting in both additive and dominant fashions. Core Ideas Popping expansion is a trait that exhibits quantitative inheritance. Knowledge about the genetic control will aid in breeding programs. We used contrasting crosses and a maximum likelihood approach for inheritance study. Popping expansion is controlled by additive gene with different modifiers.