Proposal of a super trait for the optimum selection of popcorn progenies based on path analysis

Júnior, Antônio Teixeira do Amaral; Santos, Adriano dos; Gerhardt, Ismael Fernando Schegoscheski; Kurosawa, Railan Nascimento; Moreira, Nádia Fernandes; Pereira, Messias Gonzaga; Gravina, Geraldo de Amaral; Silva, F. H. de L.

doi:10.4238/gmr15049309

Cited by 12 publications

(17 citation statements)

References 8 publications

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“…do Amaral Júnior et al. (2016) also observed the weaker environmental influence on the expression of PE than on GY. The low heritability (0.43) obtained for PV can be explained by the fact that this trait is a combination of GY and PE and also incorporates the environmental influence in the expression of two polygenic traits.…”

Section: Discussionmentioning

confidence: 92%

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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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Section: Discussionmentioning

confidence: 92%

“…A challenge faced by popcorn breeding programs is the existence of a low correlation between the two main traits, PE and GY, which hinders simultaneous gains. Under these circumstances, the super‐trait PV can be used in breeding programs to optimize selective gains for the crop (do Amaral Júnior et al., 2016).…”

Section: Methodsmentioning

confidence: 99%

Genomic selection helps accelerate popcorn population breeding

Schwantes

Júnior

Filho³

et al. 2020

Crop Science

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“…Reports in the literature suggest that a larger tassel size and greater number of tassel branches tend to reduce grain yield, due to the reduction in sunlight interception by the flag leaves (self-shading) and competition for photoassimilates by different plant structures [31]. Plant height is frequently positively correlated with grain yield in popcorn [24,41] and maize [17,42]. On the other hand, higher SPAD values reflect an intensified activity of the photosynthetic machinery, particularly under DS [9,36].…”

Section: Discussionmentioning

confidence: 99%

“…Based on simple correlations, SPAD was considered a reliable trait for selection for DS tolerance in maize [9]. In addition, NGR is a trait frequently associated with higher yields [24]. The use of easily measurable and highly responsive traits can increase the efficiency of selection under stress conditions [35].…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the objective of this study was to estimate the effects of direct and indirect influence of agricultural, morphological, physiological and root architecture traits of popcorn genotypes under two water regimes, on the main variable: expanded popcorn volume per hectare (EPV), considered a supertrait, for representing the product of the two main economically important traits of the crop: popping expansion and grain yield [24]. In practice, this research concludes with the indication of secondary characteristics that can be used for the selection of more productive genotypes in dry conditions, that is, more agronomically efficient genotypes in water use [25], favoring the practice of a more sustainable agriculture in the use of water resources.…”

Section: Introductionmentioning

confidence: 99%

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Can Genetic Progress for Drought Tolerance in Popcorn Be Achieved by Indirect Selection?

et al. 2019

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The objective of this study was to estimate the direct and indirect effects of agricultural, morphological, physiological, and root traits of popcorn lines, under two conditions of water supply: full irrigation (FI) and drought stress (DS). A complete randomized block design with three replications was used to evaluate the following traits: expanded popcorn volume per hectare (EPV), 100-grain weight (100GW), mean ear length, mean ear diameter, number of grains per row (NGR), prolificacy (PRO), anthesis to silking interval, tassel length, number of tassel branches, plant height, shoot dry matter, green index (SPAD), and canopy temperature depression (CTD), root angle (RA), tap root volume (TRV), and crown root volume (CRV). Analyses of variance and path analysis, and subsequent partitioning of direct and indirect effects were performed. For the traits EPV, PRO, CTD, RA, CRV and TRV, the genotype x environment interaction was significant. Drought stress had significant effects on EPV (−7.15%), 100GW (−23.52%), SPAD (−29.31%), CTD (87.15%), RA (24.54%), and CRV (44.89%). The traits NGR and SPAD were found to be decisive for the expression of EPV. The exploitation of these traits by indirect selection is expected to induce increments in EPV in environments under DS and FI.

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Proposal of a super trait for increased grain yield, popping expansion, and ear rot resistance in popcorn

de Almeida,

Vivas,

de Souza

et al. 2024

Crop Science

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Fusarium ear rot (FER) is a disease that causes a decrease in grain quality in several popcorn fields in tropical regions. To contribute to the development of popcorn cultivars resistant to FER and superior in the main agronomic traits, the study aimed to compare gains in popping expansion (PE), grain yield (GY), and FER resistance through direct and indirect selection strategies by proposing a new super trait. The study was conducted in Campos dos Goytacazes, RJ. The traits were evaluated in 41 inbred lines from four environments using a randomized block design with four replicates. Six selection strategies and four selection intensities were tested. Direct selection on GY resulted in losses in PE and small gains in FER in the majority of the environments. Positive selection on PE resulted in FER reduction in scenarios of lower selection intensity. Selection by popping volume showed a satisfactory increase in GY and PE but was not effective in FER reduction. Selection by multi‐trait genotype–ideotype distance index resulted in GY increase only in some environments, PE increase in all environments, and FER reduction in all environments under higher selection intensities. The newly developed super trait popping volume without Fusarium (PVwF) showed the possibility of increasing GY (32.90% at 88.8%) and PE (5.10% at 10.20%) while simultaneously reducing FER in all environments and selection intensities (−6.30% at −6.70%). PVwF is an easily executable methodology to help popcorn breeders optimize gains in their programs. The lines L214, L217, L292, and L328 are more suitable for use in mating blocks aimed to develop superior popcorn hybrids.

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Proposal of a super trait for the optimum selection of popcorn progenies based on path analysis

Cited by 12 publications

References 8 publications

Genomic selection helps accelerate popcorn population breeding

Genomic selection helps accelerate popcorn population breeding

Can Genetic Progress for Drought Tolerance in Popcorn Be Achieved by Indirect Selection?

Proposal of a super trait for increased grain yield, popping expansion, and ear rot resistance in popcorn

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