Variabilidade genética em progênies de Campomanesia xanthocarpa Mart. ex O. Berg em viveiro

Kampa, Mariá Bach; Homczinski, Isabel; Roque, Rafael Henrique; Filho, Afonso Figueiredo; Peres, Fabiana Schmidt Bandeira; Tambarussi, Evandro Vagner

doi:10.18671/scifor.v48n125.10

Cited by 19 publications

(6 citation statements)

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“…The greater the environmental influence in the tests (CV e ), the lower the genetic values observed (h 2 a , h 2 w , h 2 m and b ̂) (Table 1), which is consistent with results obtained in studies on other forest species (Menegatti et al 2016, Kampa et al 2020, Corrêa et al 2021, Garuzzo et al 2021. As noted, these estimates may vary according to populations, environments, traits, nature of the traits, age, and estimation methods used (Pires et al 2011).…”

Section: Resultssupporting

confidence: 84%

“…The characterization of the genetic variability of base populations of forest species in the form of progeny tests has been well documented in research carried out under field conditions (Garuzzo et al 2021, Lustri et al 2021, Souza et al 2021. As a way of anticipating this characterization, morphophysiological assessments at the seedling (Kampa et al 2020) and plantlet stages (Menegatti et al 2016, Corrêa et al 2021) have also been conducted. However, the question remains as to whether progenies that stand out phenotypically and genotypically at the plantlet stage also show good phenotypic and genotypic performance at more advanced stages of development, such as the seedling and juvenile stages.…”

Section: Introductionmentioning

confidence: 99%

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Phenotypic and genotypic evaluation of Parkia platycephala families: a proposal for pre-selection

Silva

Farias

Dias

et al. 2023

Crop Breed. Appl. Biotechnol.

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The objective of the study was to determine whether Parkia platycephala families with superior morphophysiological traits perform consistently across four stages of early development (plantlets, seedlings, and juveniles at 34 and 60 months), as a means to assess the possibility of conducting preselection. For 21 morphophysiological traits, the following genetic parameters were estimated: heritability, coefficients of variation (genetic, relative, and environmental), accuracy, genetic and phenotypic correlation, percentage of coincidence (PC) of the best families, effective population size, and inbreeding in three progeny tests conducted under laboratory, nursery, and field conditions. Families of P. platycephala showed significant phenotypic and genotypic differences. The traits evaluated show genetic control. The percentage of coincidence between the best families was more accurate when the selection intensity was greater than 50% (PC ≥ 52%). Based on the evaluated traits, a pre-selection strategy at the juvenile stage for P. platycephala was researched to effectively identify superior families.

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Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Phenotypic and genotypic evaluation of Parkia platycephala families: a proposal for pre-selection

Silva

Farias

Dias

et al. 2023

Crop Breed. Appl. Biotechnol.

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“…The estimates of genetic parameters for the studied traits are shown in Table 1. Days to flowering (DFL), days to fruiting (DFR), green pod weight (GPW), green pod width (GW), green pod length (GPL), green pod thickness (GPT), number of grains per pod (NGP), and green grain thickness (GGT) showed heritability higher than 70%, indicating little effect of the environment and control by genetic variability components, denoting potential for selection (KAMPA et al, 2020). Heritability (h²) expresses the proportion of genetic variance over phenotypic variance (SANTOS et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Genetic parameters and selection indices of cowpea genotypes for green grain production

et al. 2023

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Cowpea is a legume that is grown worldwide and used for different purposes, especially as green grains. However, considering the low availability of cowpea cultivars for green grain production, selecting genotypes that have better traits for this purpose is necessary. In this context, the objective of this study was to estimate genetic parameters and evaluate different selection indices for identifying superior cowpea genotypes and subsidizing cowpea breeding programs focused on green grain production. A field experiment was conducted at the Center of Agricultural Sciences of the Federal University of Ceará (UFC), Ceará, Brazil. The treatments consisted of 42 cowpea genotypes from the Active Germplasm Bank of the UFC. Fourteen traits were used for characterization. The experiment was conducted in an augmented block design with four controls. The data obtained were subjected to analysis of variance, and genetic parameters, correlations, and selection indices were determined. The traits days to flowering (DFL), days to fruiting (DFR), green pod weight (GPW), green pod width (GW), green pod length (GPL), green pod thickness (GPT), number of grains per pod (NGP), and green grain thickness (GGT) showed heritability higher than 70%, indicating that selection in an early generation is favorable. The genetic correlations between the trait pairs DFL×DFR, GPW×GPL, and GW×GGT were higher than the phenotypic and environmental correlations. Genotypes CE-228, CE-688, CE-994, CE-165, CE-796, and BRS-Paraguaçu showed simultaneous superiority for the evaluated traits and are the most appropriate for green grain production.

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“…Populations that exhibit high CV g indicate potential for improvement via genetic gains in the breeding program (Zanata et al, 2010). The main advantage of utilizing the coefficient of variation in trait analysis is to enable the quantification and weighting of the proportion of variation within a population, which exists due to genetic and environmental factors (Kampa et al, 2020). This parameter, along with the h², provides the basis for decision-making to increase forage production within the current P. notatum Flügge breeding program.…”

Section: Discussionmentioning

confidence: 99%

Repeatability and genotypic stability in intraspecific hybrids of Paspalum notatum Flügge

Weiler,

Silveira,

Brunes

et al. 2023

Revista Brasileira De Zootecnia

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The objective of this study was to verify the repeatability of the expression of forage characters in intraspecific hybrids of Paspalum notatum Flügge to aid early selection. Across five harvests, plant height, tiller population density, leaf dry matter, stem dry matter, inflorescence dry matter, total dry matter, and growth habit were quantified for five parents, 189 hybrids, and a commercially available cultivar as a control (n = 195). Analysis of variance, principal components analysis, and structural analysis methods were used to determine the repeatability coefficients. The repeatability coefficients (ρ̂) for all evaluated characteristics generated by the different methods were between 0.05 (ANOVA II) and 0.95 (PCACov). For most of the characteristics studied, repeatability coefficients and determination coefficients were considered high. The repeatability coefficients estimates obtained for the eight characteristics evaluated with the ANOVA I and II methods were almost always lower than those obtained by PCA and structural analysis methods. Based on the covariance matrix, the principal component method generated higher estimates than those produced by ANOVA or structural analysis. Assuming a minimum 80% reliability to verify the relative superiority of the hybrids across all assessed traits, the five harvests proved adequate for selecting the optimal plant materials to advance to the next phase of the breeding program. However, reliable early selection for leaf dry matter, leaf:stem ratio, and total dry matter required a minimum of two harvests. The genetic parameters (h 2 and CVg) showed a favorable scenario for direct selection to increase forage production.

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Variabilidade genética em progênies de Campomanesia xanthocarpa Mart. ex O. Berg em viveiro

Cited by 19 publications

References 0 publications

Phenotypic and genotypic evaluation of Parkia platycephala families: a proposal for pre-selection

Phenotypic and genotypic evaluation of Parkia platycephala families: a proposal for pre-selection

Genetic parameters and selection indices of cowpea genotypes for green grain production

Repeatability and genotypic stability in intraspecific hybrids of Paspalum notatum Flügge

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