Effect of recurrent selection on the variability of the UENF-14 popcorn population

Ribeiro, Rodrigo Moreira; Júnior, Antônio Teixeira do Amaral; Pena, Guilherme Ferreira; Vivas, Marcelo; Kurosawa, Railan Nascimento; Gonçalves, Leandro Simões Azeredo

doi:10.1590/1984-70332016v16n2a19

Cited by 22 publications

(28 citation statements)

References 17 publications

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“…Heritability estimates for popcorn were 0.81, 0.91 and 0.84, and for field corn were 0.90, 0.88, and 0.82 for Year 1, Year 2, and combined, respectively. These values are congruent with previous reports that popping expansion is consistent across environments and has moderate to high heritability, ranging from 0.68 to 0.90 (Robbins and Ashman, 1984; Pereira and do Amaral Júnior, 2001; Freitas Júnior et al, 2009; Ribeiro et al, 2016). Genotypic variance for popping expansion estimated within each subgroup was much smaller than when estimated for the complete set of lines (Table 1), indicating that much of the genetic variation for popping expansion occurs between popcorn and field corn lines, with less variation within each group.…”

Section: Resultssupporting

confidence: 92%

Genomic‐Wide Association Study of Popping Expansion in Tropical Popcorn and Field Corn Germplasm

Senhorinho¹,

Coan²,

Marino

et al. 2019

Crop Science

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Popcorn is a popular snack food with higher grain value compared with “field corn” maize (Zea mays L.). In general, popcorn germplasm is less improved than common maize cultivars, with less favorable agronomic performance and greater susceptibility to pests, diseases, and lodging, especially in tropical environments. One approach to expanding and improving popcorn germplasm is to introduce favorable alleles for agronomic performance from field corn. If markers tagging quantitative trait loci (QTLs) associated with popping expansion were identified, they could be selected with markers to maintain popping expansion in breeding populations derived from crosses between field and popcorn germplasm. The objectives of this study were to identify single nucleotide polymorphism (SNP) markers and putative candidate genes associated with higher popping expansion in a diverse sample of popcorn and field corns relevant to Brazilian breeding programs. We applied a comprehensive genome‐wide association study (GWAS) for popping expansion, using 165,089 SNP markers in 183 inbred lines with 2 yr of trial data. Four SNPs were significantly associated with popping expansion, three of which were colocalized to previously reported meta‐QTLs, and one that was novel. Annotated genes closely linked to the associated SNPs were identified with functions related with starch content, which plays an important role in popping expansion quality. If these associations can be validated independently, they can be useful for breeders to select agronomically superior genotypes with greater popping expansion.

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Section: Resultssupporting

confidence: 92%

Genomic‐Wide Association Study of Popping Expansion in Tropical Popcorn and Field Corn Germplasm

Senhorinho¹,

Coan²,

Marino

et al. 2019

Crop Science

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“…Additive variance predominated in all crosses with little contribution of dominance to the genetic variance (Tables 4 and 5), which is expected for PE (Scapim et al, 2006;da Silva et al, 2010). Broad and narrow-sense heritabilities ranged from moderate to high estimations (Table 6) and similar to previous studies (Pereira and Amaral Júnior, 2001;Freitas Júnior et al, 2009;Ribeiro et al, 2016). These results also highlight the importance of additive effect on PE.…”

Section: Resultssupporting

confidence: 89%

Inheritance Study for Popping Expansion in Popcorn vs. Flint Corn Genotypes

Coan¹,

Pinto²,

Kuki³

et al. 2019

Agronomy Journal

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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 (P1 and P2, F1, F2, BC1‐Popcorn and BC1‐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.

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“…These results indicate that even with the use of different progeny strategies (full-sibs, S 1 and halfsibs), there was an increase in allele frequencies for the traits of interest, with greater adaptability to counties in the north and northwest of the State of Rio de Janeiro. This progress has been described by Ribeiro et al (2016) and Guimarães et al (2018b). While the first authors investigated cumulative gains in GY and PE based on phenotypic responses in the same study population over seven cycles (C0-C6), the latter authors used microsatellite molecular markers (EST-SSRs), inferring an increase in favourable alleles over nine selection cycles (C0-C8), which may be related to the main traits of interest.…”

Section: Genetic Progress In the Selection Cycles Of Population Uenf-14mentioning

confidence: 99%

Genetic Gains in the Popcorn Population Uenf-14: Developing the Ninth Generation of Intrapopulation Recurrent Selection

et al. 2019

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The occurrence of negative correlations between grain yield (GY) and popping expansion (PE) in popcorn complicates the selection process. In an attempt to overcome this inconvenience, we proposed the use of the importance characteristic volume per popcorn per hectare (PV). The objectives of this study were to develop the ninth cycle of the UENF-14 popcorn population, to estimate the direct and indirect effects of PV and to verify the genetic progress among all selective cycles. We obtained and evaluated 200 inbred progenies in randomised blocks arranged in replicates within sets, with nine sets consisting of 25 progenies and one set with all previous eight cycles with three replicates. The average height of the plants, prolificacy, 100-grain weight, grain yield, grain popping expansion and volume per popcorn per hectare were evaluated. Track analysis was performed to determine the direct and indirect effects, and the Mulamba and Mock selection index was calculated for the selection of the 40 superior progenies. There was genetic variability among progenies in all evaluated traits, with a cause-and-effect relationship between PV with GY and PE, allowing simultaneous gains with indirect selection. The selection of the best progenies was more effective when using arbitrarily assigned weights, which provided higher predicted gains for PV (20.73%). The means obtained in all cycles indicated increases, demonstrating the efficiency of using continuous recurrent selection in popcorn breeding programs.

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Effect of recurrent selection on the variability of the UENF-14 popcorn population

Cited by 22 publications

References 17 publications

Genomic‐Wide Association Study of Popping Expansion in Tropical Popcorn and Field Corn Germplasm

Genomic‐Wide Association Study of Popping Expansion in Tropical Popcorn and Field Corn Germplasm

Inheritance Study for Popping Expansion in Popcorn vs. Flint Corn Genotypes

Genetic Gains in the Popcorn Population Uenf-14: Developing the Ninth Generation of Intrapopulation Recurrent Selection

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