scholarly journals Estimation of genetic parameters and verification of early selection efficiency in baru (Dipteryx alata)

2014 ◽  
Vol 14 (4) ◽  
pp. 238-243 ◽  
Author(s):  
Alisson Moura Santos ◽  
Sebastião Carlos da Silva Rosado ◽  
Adelson Nascimento Oliveira
Keyword(s):  
Genetic Parameters ◽  
Block Design ◽  
Early Selection ◽  
Selection Efficiency ◽  
Narrow Sense Heritability ◽  
Breast Height ◽  
Brazilian Savannah ◽  
Randomized Block Design ◽  
Sib Families ◽  
Dipteryx Alata

This study aimed at verifying the efficiency of early selection, and estimating the genetic parameters in Dipteryx alata. The 66 half-sib families were obtained from three seed provenances at the Brazilian Savannah of the state of Minas Gerais. The experiment was carried out in a randomized block design with 3 replications and 5 plants per plot. Data diameters at breast height (DBH) and total height (TH) were taken at the ages of 64, 125 and 138 months. REML/BLUP methodology was applied in the D. alata different provenances and progenies. Analysis indicated significant genetic variability (P < 0.01) between and within provenances. Both traits, DBH and TH, presented high narrow sense heritability for the ages analyzed. High genetic correlation occurred between DBH and TH traits, and between ages (age-age); thus, it allowed indirect selection, as well as early selection with high genetics gains.

scholarly journals Early selection efficiency for recommendation of Eucalyptus sp.

2020 ◽  
Vol 8 (3) ◽  
pp. 304-315
Author(s):  
Yanca Araujo Frias ◽  
Eliel Alves Ferreira ◽  
Victor Hugo Cruz ◽  
Daniel Pedrosa Alves ◽  
Evandro Pereira Prado ◽  
...  
Keyword(s):  
Plant Height ◽  
Block Design ◽  
Selection Index ◽  
Early Selection ◽  
Direct Selection ◽  
Selection Efficiency ◽  
Breast Height ◽  
Randomized Block Design ◽  
Progeny Tests ◽  
Combined Selection

This paper aims to estimate genetic and phenotypical parameters to assess the viability of early selection in progeny tests of Eucalyptus sp. We analyzed data from experiments conducted in the state of Minas Gerais, Brazil. The evaluated traits were diameter at breast height and plant height in 482 progenies of full sibs under randomized block design, into nine experiments: four of which were assessed at progenies mean level, and five assessed at individuals mean level. It were evaluated the predicted gains with combined selection index under 5, 10 and 20% of selection; the coincidence among selected families in juvenile and adult ages, and the efficiency of early selection. Results indicated that the procedures were efficient in most of the scenarios, and the gains comparable to the direct selection on tree harvest age.

scholarly journals Plant stand failures effect in genetic parameters estimation procedure in Eucalyptus sp.

2020 ◽  
Vol 8 (3) ◽  
pp. 264-276
Author(s):  
Yanca Araujo Frias ◽  
Osmar Gabriel Trigo Marques de Oliveira ◽  
João Victor Tino Dellaqua ◽  
Evandro Pereira Prado ◽  
Paulo Renato Matos Lopes ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Block Design ◽  
Estimation Procedure ◽  
Parameters Estimation ◽  
Forest Genetics ◽  
Breast Height ◽  
Randomized Complete Block Design ◽  
Sib Families ◽  
Plant Stand ◽  
Selective Process

The objective of this work was to verify the influence of the percentage of failures in a forest genetics experiment in the estimation of genetic parameters. The study consisted in the evaluation of two experiments of full‑sib families under randomized complete block design with three replicates conducted in the state of Minas Gerais, Brazil. The experiment I was evaluated in January 2002, with approximately 60 months of age. The experiment II was evaluated in January 2003, with 45 months of age. In both experiments, the evaluations consisted of the measurement of the diameter at breast height and plant height. For all the investigated genetic parameters, an increase in the amplitude of the estimates was verified due to the increase in the number of experimental failures. Variances and negative heritabilities were detected, from 35% of failure, indicating that in such cases, this proportion of failure may be problematic to estimate genetic values, to estimate the gain with the selective process and for make decision.

scholarly journals FEASIBILITY OF EARLY Pinus taeda L. SELECTION TO ASSESS GROWTH VARIABLES IN PROGENY TEST

FLORESTA ◽  
2021 ◽  
Vol 51 (4) ◽  
pp. 937
Author(s):  
Paulo César Flôres Júnior ◽  
Vanessa Ishibashi ◽  
Jorge Luis Monteiro de Matos ◽  
Diego Tyszka Martinez ◽  
Antonio Rioyei Higa
Keyword(s):  
Genetic Correlation ◽  
Genetic Parameters ◽  
Block Design ◽  
Genetic Parameter ◽  
Genetic Correlations ◽  
Critical Factor ◽  
Early Selection ◽  
Parameter Estimates ◽  
Randomized Block Design ◽  
Adult Plants

Forest species breeding programs require a long period-of-time for plants to reach the proper age to enable selecting superior genotypes, which is a critical factor in selection processes. Thus, the aims of the current study are to estimate genetic parameters in juvenile and adult plants (6, 10 and 20 years) in order to investigate genetic correlations between variables at different ages and at certain ages; as well as to determine whether it is possible performing efficient early selection in juvenile plants. The test was implemented in 1997; it comprised 120 progenies and followed a randomized block design, with five repetitions - linear plots comprised 5 plants at 2.5 m x 2.5 m spacing. DBH (cm), H (m) and VOL (m³) of all tested subjects were measured at the age of 6, 10 and 20 years. Variance components, genetic parameters, as well as genetic correlations between variables and between ages were estimated in Selegen REML/BLUP® software. Genetic parameter estimates have shown superiority at 10 years, in comparison to that estimated at 6 and 20 years. Variable ‘DBH’ has shown high genetic correlation to height (H) and volume (VOL), whereas DBH x VOL have shown high genetic correlation (0.98) in 10-year-old plants. With respect to genetic correlation between ages, 10-year-old plants have shown moderate correlation to 6- and 20-year-old plants. Early selection is indicated for 10-year-old plants, in 20-year cycles, since plants at this age have shown higher selection efficiency to predict gains in comparison to adult plants.

scholarly journals Generation Mean Analysis in Cowpea [Vigna unguiculata (L.) Walp.] under Flower Thrips infestation

2018 ◽  
Vol 10 (4) ◽  
pp. 86 ◽  
Author(s):  
Gonné Sobda ◽  
Fonji Maureen Atemkeng ◽  
Ousmane Boukar ◽  
Chistian Fatokun ◽  
Pangirayi Bernard Tongoona ◽  
...  
Keyword(s):  
Block Design ◽  
Generation Mean Analysis ◽  
Flower Number ◽  
Narrow Sense Heritability ◽  
Gene Effects ◽  
Flower Thrips ◽  
Randomized Block Design ◽  
Cowpea Resistance ◽  
Predominant Type ◽  
Screen House

Two sets of six generations (P1, P2, F1, F2, BC1P1, BC1P2) of cowpea were developed from crosses of contrasting inbred lines VYA (susceptible) × SANZI (resistant) and LORI (susceptible) × SANZI (resistant). The aim of this study was to determine the inheritance and elucidate the genetic control of cowpea resistance to thrips. The first set (VYA × SANZI) was evaluated under natural thrips infestation in the field in a completely randomized block design with three replications. The second set (LORI × SANZI) was screened using artificial thrips infestation in the screen house. In each trial, data were recorded on 150 individual plants. These included the score of thrips damages using the scale of one to nine, number of thrips per flower, number of pods per plant, pod weight per plant and grain weight per plant. The generation mean analysis revealed that both additive and non-additive types of gene effects were significant. Dominance × dominance was the most predominant type of gene effects for thrips resistance, suggesting that breeders should delay selection to late generations to allow advancement of as many high-potential recombinants as possible during hybridization. The number of genes that control the expression of number of thrips per flower was three and ranged from three to four, for score of thrips damages. High broad sense and moderate narrow sense heritability were observed ranging from 0.53 to 0.65 and 0.14 to 0.36, respectively for all of the traits measured. 

scholarly journals Genetic parameters and estimated genetic gains in young rubber tree progenies

2013 ◽  
Vol 48 (4) ◽  
pp. 411-416 ◽  
Author(s):  
Cecília Khusala Verardi ◽  
Erivaldo José Scaloppi Junior ◽  
Guilherme Augusto Peres Silva ◽  
Lígia Regina Lima Gouvêa ◽  
Paulo de Souza Gonçalves
Keyword(s):  
Genetic Gain ◽  
Genetic Parameters ◽  
Block Design ◽  
Rubber Tree ◽  
First Year ◽  
Genetic Gains ◽  
Selection Gain ◽  
Randomized Block Design ◽  
Using Data ◽  
Selection Of

The objective of this work was to assess the genetic parameters and to estimate genetic gains in young rubber tree progenies. The experiments were carried out during three years, in a randomized block design, with six replicates and ten plants per plot, in three representative Hevea crop regions of the state of São Paulo, Brazil. Twenty-two progenies were evaluated, from three to five years old, for rubber yield and annual girth growth. Genetic gain was estimated with the multi-effect index (MEI). Selection by progenies means provided greater estimated genetic gain than selection based on individuals, since heritability values of progeny means were greater than the ones of individual heritability, for both evaluated variables, in all the assessment years. The selection of the three best progenies for rubber yield provided a selection gain of 1.28 g per plant. The genetic gains estimated with MEI using data from early assessments (from 3 to 5-year-old) were generally high for annual girth growth and rubber yield. The high genetic gains for annual girth growth in the first year of assessment indicate that progenies can be selected at the beginning of the breeding program. Population effective size was consistent with the three progenies selected, showing that they were not related and that the population genetic variability is ensured. Early selection with the genetic gains estimated by MEI can be made on rubber tree progenies.

scholarly journals DESENVOLVIMENTO INICIAL DE MUDAS DE BARUZEIRO (Dipteryx alata Vog) EM FUNÇÃO DE SUSBTRATOS E LÂMINAS DE IRRIGAÇÃO

Irriga ◽  
2017 ◽  
Vol 22 (2) ◽  
pp. 288-300 ◽  
Author(s):  
Henrique Fonseca Elias de Oliveira ◽  
Cléber Luiz De Souza ◽  
Danilo Vieira Félix ◽  
Leandro Da Silva Fernandes ◽  
Polliany Santos Xavier ◽  
...  
Keyword(s):  
Quality Index ◽  
Dry Matter ◽  
Block Design ◽  
Initial Growth ◽  
Aerial Portion ◽  
Randomized Block Design ◽  
System Length ◽  
E Mail ◽  
Dickson Quality Index ◽  
Dipteryx Alata

DESENVOLVIMENTO INICIAL DE MUDAS DE BARUZEIRO (Dipteryx alata Vog) EM FUNÇÃO DE SUSBTRATOS E LÂMINAS DE IRRIGAÇÃO  HENRIQUE FONSECA ELIAS DE OLIVEIRA1; CLÉBER LUIZ DE SOUZA2; DANILO VIEIRA FÉLIX2; LEANDRO DA SILVA FERNANDES2; POLLIANY SANTOS XAVIER2 E LUCAS MAGALHÃES ALVES2 1Eng. Agrícola, Doutor, Instituto Federal Goiano, GO 154, km 03, CEP 76300-000, Ceres – GO, e-mail: [email protected]ônomo (a), Instituto Federal Goiano, GO 154, km 03, CEP 76300-000, Ceres – GO, e-mail: [email protected], [email protected], [email protected], [email protected], [email protected]  1 RESUMO O presente estudo objetivou avaliar o crescimento inicial de plantas de baruzeiro, sob substratos e lâminas de irrigação e identificar o manejo que resulte em condições ideais para a produção de mudas desta espécie. Foi implantado um experimento no delineamento em blocos ao acaso, com quatro repetições, em parcelas subdivididas no esquema 5 x 4, sendo as parcelas compostas por lâminas de irrigação diárias (6, 8, 10, 12 e 14 mm) e as subparcelas substratos: S1 - 100% Latossolo vermelho; S2 - 50% Latossolo vermelho e 50% Areia; S3 - 45% Latossolo vermelho, 45% Areia e 10% Esterco Bovino Curtido e S4 - Substrato comercial Basaplant®. As características avaliadas foram altura de planta, diâmetro de caule, número de folíolos, comprimento de raiz, massa seca de raiz, massa seca de parte aérea, massa seca de muda, relação das massas secas de raiz e parte aérea e índice de qualidade de Dickson. Aos 200 dias após a semeadura (DAS) o substrato S1 proporcionou maior crescimento e qualidade às plantas de baruzeiro, dado pelo Índice de Qualidade de Dickson (IQD) obtido de 1,05, assim como a lâmina de 14 mm dia-1, a qual obteve IQD igual 0,98, diferindo estatisticamente das demais lâminas avaliadas. Palavras-chave: gotejamento, características produtivas, Índice de Qualidade de Dickson.  OLIVEIRA, H. F. E.; SOUZA, C. L.; FÉLIX, D. V.; FERNANDES L. S.; XAVIER, P. S.; ALVES, L. M.INITIAL DEVELOPMENT OF BARUZEIRO (Dipteryx alata Vog) SEEDLING AS FUNCTION OF SUBSTRATES AND IRRIGATIONS LEVELS  2 ABSTRACT This study aimed to evaluate the initial growth of baruzeiro plants, under substrates and irrigation levels and identify the management that results in ideal conditions for the production of seedlings of this species. The experiment was installed in a randomized block design, with four replications, in split-plot, in the scheme 4 x 5, with plots composed of five daily irrigations levels and four subplots substrates: S1 - 100% OXISOL RED; S2 - 50% OXISOL RED and 50% sand; S3 - 45% OXISOL RED, 45% sand, and 10% of tanned manure and S4 - Commercial Substrate Basaplant. The five daily watering (6, 8, 10, 12 and 14 mm) make up the subplot. The characteristics assessed were plant height, stem diameter, number of leaflets, root system length, dry matter mass of roots, dry matter mass of aerial portion, dry matter  mass of seedling, ratio between roots dry matter mass and aerial portion and seedling quality. At 200 DAS substrate S1 provided greater growth and quality to baruzeiro plants, given by the Dickson Quality Index (DQI) obtained of 1.05, as well as the irrigation depth of 14 mm day-1, once it obtained DQI equal to 0.98, statistically differing from the other irrigation depths assessed. Keywords: drip irrigation, productive characteristics, Dickson Quality Index.

scholarly journals EFICIÊNCIA DE DUAS VARIAÇÕES ESTRUTURAIS DO MÉTODO DE AMOSTRAGEM DE ÁREA FIXA EM PLANTAÇÕES DE Pinus taeda

FLORESTA ◽  
2013 ◽  
Vol 43 (4) ◽  
pp. 621
Author(s):  
João Paulo Druszcz ◽  
Nelson Yoshihiro Nakajima ◽  
Sylvio Pellico Netto ◽  
Sebastião do Amaral Machado ◽  
Nelson Carlos Rosot ◽  
...  
Keyword(s):  
Pinus Taeda ◽  
Relative Efficiency ◽  
Block Design ◽  
Basal Area ◽  
Average Diameter ◽  
Breast Height ◽  
Variable Diameter ◽  
Randomized Block Design ◽  
Fixed Area ◽  
Pinus Taeda L

Este estudo foi conduzido em três diferentes condições de plantações de Pinus taeda L., sem desbastes, com 10, 9 e 7 anos de idade, 2.000 árvores por hectare e diferentes inclinações no terreno, localizados no Estado do Paraná. O objetivo foi avaliar a eficiência do inventário florestal, utilizando-se a amostragem de área fixa com a estrutura de parcela circular (PC) e conglomerado em cruz (CC), através da análise do comportamento quanto às precisões e eficiências relativas nas estimativas das seguintes variáveis: diâmetro médio (cm), número de árvores por ha, área basal (m2/ha) e volume total (m3/ha). Para isso, utilizou-se o delineamento em blocos casualizados com 40 unidades amostrais para a PC e 10 unidades para o CC, sendo este composto por 4 subunidades circulares. Concluiu-se que, para as variáveis diâmetro médio (cm), número de árvores (N/ha), área basal (m2/ha) e volume total (m3/ha), indica-se a utilização do método de área fixa com PC, tendo em vista a maior eficiência no levantamento dessas variáveis.Palavras-chave: Eficiência relativa; precisão; reflorestamento. AbstractStructural efficiency of two variations of method of sampling of fixed area in plantations of Pinus taeda. This study was carried out in three different stands of Pinus taeda L., unthinned and aged 10, 9 and 7 years. The stands have 2.000 trees per hectare and are located in Parana State. The aim was to evaluate the efficiency of inventories using circular plot (PC) and cross cluster (CC) by analyses of behavior towards accuracies and relative efficiencies for estimation of the following variables: average diameter at breast height, number of trees, basal area and total volume per hectare. For this study, it was taken a sample of 40 units to the PC structure and 10 units for the CC structure, which is composed of four circular subunits, and it was used the randomized block design. It was concluded that for the variable diameter (cm), number of trees (ha), basal area (m2/ha) and total volume (m3/ha) it is indicated the use of PC, since its greater efficiency in the survey of these variables.Keywords: Relative efficiency; accuracy; reforestation.

scholarly journals Genetics and expected selection gain for growth traits in Eugenia dysenterica DC. populations

Bragantia ◽  
2009 ◽  
Vol 68 (3) ◽  
pp. 629-637 ◽  
Author(s):  
Ananda Virginia de Aguiar ◽  
Roland Vencovsky ◽  
Lázaro José Chaves ◽  
Mara Fernandes Moura ◽  
Lizz Kezzy de Morais
Keyword(s):  
Genetic Variation ◽  
Genetic Parameters ◽  
Growth Traits ◽  
Block Design ◽  
Genetic Material ◽  
Germplasm Collection ◽  
Seed Orchard ◽  
Seedling Seed Orchard ◽  
Randomized Block Design ◽  
Eugenia Dysenterica

The objective of this study was to estimate genetic parameters of quantitative traits in a living germplasm collection of Eugenia dysenterica. The genetic material consisted of 110 progenies derived from 10 natural Eugenia dysenterica subpopulations sampled in the southeastern region of the state of Goiás. The experiment was established in a complete randomized block design, with 110 treatments, four replications and one tree per plot. The study variables were total height, stem diameter and respective growth rates. After the analysis of variance some genetic parameters were estimated. The levels of genetic variation in the collection were high and the highest proportion was found within subpopulations. Highest coefficients of heritability and genetic variation were observed in subpopulations from the counties Catalão, Três Ranchos, Cristalina and Senador Canedo. Considering the promising expected progress for growth traits, this collection can be converted into an unrogued seedling seed orchard, aiming the production of improved seed.

scholarly journals Genetic parameters and performance of sugarcane families under cold stress in the South of Brazil

2018 ◽  
Vol 53 (5) ◽  
pp. 583-592 ◽  
Author(s):  
Mario Alvaro Aloisio Verissimo ◽  
Ricardo Augusto de Oliveira ◽  
Sérgio Delmar dos Anjos e Silva ◽  
Edelclaiton Daros ◽  
Adílson Härter
Keyword(s):  
Cold Stress ◽  
Genetic Parameters ◽  
Mixed Model ◽  
Block Design ◽  
Genetic Progress ◽  
Incomplete Block Design ◽  
Sib Families ◽  
Heritability Estimates ◽  
And Performance ◽  
South Of Brazil

Abstract: The objective of this work was to estimate the genetic parameters for the performance prediction of sugarcane (Saccharum spp.) families under natural cold stress, in Southern Brazil, and to identify the best combinations of parents aiming at the selection for tolerance to cold. Fifty-three full-sib families were evaluated in an incomplete block design, with five replicates per family, in the municipality of Pelotas, in the state of Rio Grande do Sul, Brazil. Harvest occurred in August 2013, nine months after planting and after cold spells with negative temperatures down to -2.2ºC. Statistical analyses, performed with the mixed model methodology, detected significant differences among families. Heritability estimates among progeny means were higher than those of individual heritability. Estimates of genetic progress for the traits megagrams of stalks per hectare, megagrams of brix per hectare, and number of stalks indicated gains of 93.8, 91.0, and 53.3%, respectively. A set of eight promising families that combine high estimates for yield and cold stress tolerance was obtained.

scholarly journals Study of repeatability and phenotypical stabilization in kale using frequentist, Bayesian and bootstrap resampling approaches

2019 ◽  
Vol 41 (1) ◽  
pp. 42606
Author(s):  
Orlando Gonçalves Brito ◽  
Valter Carvalho de Andrade Júnior ◽  
Alcinei Mistico de Azevedo ◽  
Luan Mateus Silva Donato ◽  
Lidiane Rodrigues Silva ◽  
...  
Keyword(s):  
Genetic Improvement ◽  
Genetic Parameters ◽  
Block Design ◽  
Bootstrap Resampling ◽  
Average Mass ◽  
Estimated Parameters ◽  
Randomized Block Design ◽  
Number Of Leaves ◽  
Bayesian Methodologies ◽  
Selection Of

The aim of this study was to obtain information for the genetic improvement of kale through repeatability and phenotypic stabilization studies and to compare methodologies that represent the reliability of the estimated parameters. Thirty-three half-sib progenies were evaluated in a randomized block design with three replicates and six plants per plot. Eight harvests were evaluated in terms of the yield of fresh leaves, number of shoots, number of leaves and average mass of leaves. Then, a phenotypic repeatability and stabilization study was performed, estimating the genetic parameters σ2a, σ²g, σ²e, and the coefficient of environmental variation and repeatability using the frequentist and Bayesian methodologies. To evaluate the reliability of these estimates, intervals were obtained using the frequentist, Bayesian and bootstrap methods. It was verified that the reliable selection of progenies of half-sib of kale can be achieved in four harvests that were realized between 95 and 170 days after planting. It was observed that the frequentist and Bayesian methodologies are better suited to obtain reliable estimates of the genetic parameters evaluated, as the last one provided smaller amplitudes for the obtained intervals. The bootstrap methodologies are not recommended for phenotypic repeatability and stabilization studies in kale.

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