Genetic Gains and Selection Advances of the Uenf-14 Popcorn Population

Guimarães, Amanda Gonçalves; Júnior, Antônio Teixeira do Amaral; Lima, Valter Jário de; Leite, Jhean Torres; Scapim, Carlos Alberto; Vivas, Marcelo

doi:10.1590/1983-21252018v31n202rc

Cited by 11 publications

(11 citation statements)

References 14 publications

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“…Based on the proposal of these authors, the CVe for the trait prolificacy was considered high (19.27 to 25.81%), while for mean plant height (3.56 to 8.25%), yield (8.25 to 15.49%) and 100-grain weight (4.82 to 20.04%), the estimates were considered moderate, that is, the lower the CVes values, the better the accuracy of the data, since they indicate the quality of the data and to which extent the environment interferes with the evaluations. A better accuracy of the data in the present research was demonstrated in relation to the previous cycle for the main characteristics; the yield and capacity expansion CVe of 8.88 and 6.50% respectively, already in the eighth cycle in this same order, were 18.52 and 13.81%, as presented by Guimarães et al (2018a).…”

Section: Resultssupporting

confidence: 70%

“…Regarding the mean values obtained in this ninth recurrent selection cycle of the UENF-14 popcorn population (Table 1), compared to the previous cycle, there was a decrease in prolificity by 23.62%, in weight of 100 grains by 2.89% and in yield by 10.73% (GUIMARÃES et al, 2018a). This was expected, since in this study, we used S 1 progenies and, in the previous cycle, full-sibs.…”

Section: Resultsmentioning

confidence: 59%

“…Population traits and genetic parameters in the ninth selection cycle of population The population characteristics, measures of genetic parameters, variability, as well as the environmental effect, and the data quality of the population evaluated are important for breeders. This information assists them in choosing breeding strategies for the selection of superior genotypes and in developing new varieties for producers (GUIMARÃES et al, 2018a). The individual analysis of variance of each environment was carried out and showed homogeneity of residual variancesratio between highest and lowest mean squares of the residue lower than seven (GOMES;GARCIA, 2002) in all characteristics; subsequently, the joint analysis of variance was performed.…”

Section: Resultsmentioning

confidence: 99%

“…The methodology of recurrent selection is the main alternative, consisting of a cyclical process that increases the frequency of favourable alleles, raising the mean of the main traits without exhausting the genetic variability of the population (HALLAUER; MIRANDA FILHO; CARENA, 2010), although it is believed that the gains are no longer significantly increased in the more advanced cycles. The methodology of recurrent selection has already been used in some studies on popcorn (EMATNÉ et al, 2012;FARIA et al, 2008;GUIMARÃES et al, 2018a;LIMA et al, 2018;REIS et al, 2009;VILARINHO et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…Popcorn consumption has increased over the years, which has made it an economically attractive crop to producers (RIBEIRO et al, 2016). The development and release of new popcorn cultivars are essential to reducing the dependence on genotypes from foreign countries and meeting the demand of producers and consumers by offering Freire et al them cultivars and products with the traits of interest (GUIMARÃES et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Amylose content and micromorphology of popcorn progenies with different popping expansion volumes

et al. 2020

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Popcorn (Zea mays var. everta) has a higher commercial value than common maize, in addition to being a popular food among consumers. Today, there is a constant search for cultivars with superior performance for several traits of interest in the case of popcorn, yield and popping expansion. On this basis, this project proposes to characterize progenies of popcorn with different values of expansion capacity regarding chemical composition and micromorphology. Kernels from the fifth cycle (C5) of intrapopulation recurrent selection were evaluated. The progenies were selected based on the popping expansion volume of their kernels. The kernels were quantified for amylose and analyzed for starch granule arrangement and pericarp thickness by scanning electron microscopy. Progenies with low popping expansion volume (0 and 7 mL g-1) showed amylose contents of 21.24 and 20.18%, respectively; a less compact endosperm, with individual starch granules interspaced with empty spaces; and pericarp thickness between 40.94 and 38.99 µm, respectively. By contrast, progenies with high popping expansion volume (30 and 35 mL g-1) showed amylose contents of 23.92 and 26.10%; a vitreous endosperm; more-compact starch granules without empty spaces in between; and pericarp thickness between 107.66 and 107.84 µm. Progenies with higher popping expansion volume exhibited a thicker pericarp, a high amylose percentage and a more-compact endosperm, whereas those with the lower expansion volumes showed a thinner pericarp, a lower amylose percentage and individual starch granules.

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Genomic selection helps accelerate popcorn population breeding

Schwantes

Júnior

Filho³

et al. 2020

Crop Science

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Recurrent selection is a method for developing new popcorn (Zea mays L.) cultivars.We aimed to determine the selection accuracy and genetic gains for different selection strategies: estimates based exclusively on phenotypic data (PhEN), estimates based on phenotypic and genotypic data (PhEN + GEN), and estimates based exclusively on single nucleotide polymorphism (SNP) marker genotyping (GEN). For the GEN strategy, we tested, via simulation, the possibility of reducing the number of SNPs and increasing the training population. The traits evaluated were 100-grain weight, ear height, grain yield, popping expansion, plant height, and popping volume. Field trials were undertaken with 98 S 1 progenies at two locations in an incomplete block design with three replications. The progenies' parents were genotyped with a panel of ∼10,507 SNPs. As predicted by the GEN strategy at different selection intensities, the average annual genetic gain for the different traits were 29.1 and 25.2% higher than those of PhEN and GEN + PhEN for 98 candidates; 148.3 and 140.9% higher for 500; and 187.9 and 179.4% higher for 1,000 selection candidates, respectively. Recurrent genomic selection may result in high genetic gain, provided that: (a) phenotyping is accurate; (b) selection intensity is explored by genotyping several progenies and increasing the number of candidates; (c) genomic selection is used for early selection;and (d) the model is adjusted for a few more cycles of phenotyping. The simulation suggests that desirable values of genetic gain may be obtained by reducing the number of SNPs and increasing the training population size.

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Genetic Gains and Selection Advances of the Uenf-14 Popcorn Population

Cited by 11 publications

References 14 publications

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

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

Amylose content and micromorphology of popcorn progenies with different popping expansion volumes

Genomic selection helps accelerate popcorn population breeding

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