Estimates of genetic parameters for physic nut traits based in the germplasm two years evaluation

Laviola, Bruno Galvêas; Alves, Alexandre Alonso; Gurgel, F. de L.; Rosado, Tatiana Barbosa; Rocha, Rodrigo Barros; Albrecht, J. C.

doi:10.1590/s0103-84782012000300008

Cited by 36 publications

(32 citation statements)

References 8 publications

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“…Estimates of CVe higher than 20% for the productive traits possibly occurred due to the existence of variation within each accession, being similar to those reported in other studies with Jatropha, including this population (Laviola et al, 2010). 2 h estimates obtained for the traits PH12, PH40, CPR40, GY and OY are considered moderate (>50%), and are in accordance with the results reported by Laviola et al (2010Laviola et al ( , 2012b. Peixoto et al (2016), who evaluated productive traits in Jatropha, verified genetic variability between Jatropha accessions of the germplasm bank of EMBRAPA Agroenergy, and in this way, it is possible to obtain gain from selection on these traits.…”

Section: Anova and Estimates Of Genetic Parameterssupporting

confidence: 90%

Path analysis and canonical correlations for indirect selection of Jatropha genotypes with higher oil yield

et al. 2017

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ABSTRACT. Jatropha is a species with great potential for biodiesel production, and the knowledge on how the main agronomic traits are correlated will contribute to its improvement. Therefore, the objectives of this study were to estimate the genetic parameters of the traits: plant height at 12 and 40 months, canopy projection on the row at 12 and 40 months, canopy projection between the row at 12 and 40 months, number of branches at 40 months, grain yield, and oil yield; to verify the existence of phenotypic correlation between these traits; to verify the influence of the morphological traits on oil yield by means of path analysis; and to evaluate the relationship between the productive traits in Jatropha and the morphological traits measured at different ages. Sixty-seven half-sib families were evaluated using a completely randomized block design with two replications and five plants per plot. Analysis of variance was used to estimate the genetic value. Phenotypic correlations were given by the Pearson correlation between traits. For the canonical correlation analysis, two groups of traits were established: group I, consisting of traits of economic importance for the culture, and group II, consisting of morphological traits. Path analysis was carried out considering oil yield as the main dependent variable. Genetic variability was observed among Jatropha families. Productive traits can be indirectly selected via morphological traits due to the correlation between these two groups of traits. Therefore, canonical correlations and path analysis are two strategies that may be useful in Jatrophabreeding program when the objective is to select productive traits via morphological traits.

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Section: Anova and Estimates Of Genetic Parameterssupporting

confidence: 90%

Path analysis and canonical correlations for indirect selection of Jatropha genotypes with higher oil yield

et al. 2017

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“…In this research, high ȓ gg are reported (> 0.60), according to the classification of Resende (2002), for PH, SD, CPB, and CPR (Table 2), indicating that the progenies maintain relative superiority over the years (at least two measurements for SD). Results for these characteristics at similar magnitudes were also observed by Laviola et al (2012), who evaluated 110 Jatropha genotypes for two years. However, low estimates (< 0.30) were obtained for MHG, NB and GY, which suggests the need for a large number of measurements to achieve a satisfactory determination value.…”

Section: Resultssupporting

confidence: 72%

<b>Parental selection in diallel crosses of <i>Jatropha curcas</i> using mixed models

et al. 2018

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ABSTRACT. Diallel crosses in an unbalanced scheme were carried out in Jatropha to (i) evaluate the additive and non-additive genetic components; (ii) select parents through the general combining ability; (iii) estimate the specific combining ability used in the crosses; and (iv) verify the existence of the maternal effect and inbreeding depression. The experiment was carried out in a complete diallel scheme with four progenitors, unbalanced for the number of crosses. The experimental design consisted of a randomized block, with 5 replications and 3 plants per plot. The following characteristics were evaluated: stem diameter (SD), number of branches (NB), plant height (PH), canopy projection on the row (CPR), canopy projection between rows (CPB), mass of hundred grains (MHG) and grain yield (GY). Estimates of variances were obtained using the method of restricted maximum likelihood, while breeding values were estimated by the best linear unbiased prediction. It was concluded that the additive effect was predominant in the genetic control for SD, CPR, and CPB; the dominance effect was predominant for PH, NB, and GY; there was a cytoplasmic effect and nuclear genes of the female parent for all evaluated traits; parents 107 and 190 are promising for reducing the size and increasing the grain yield; there was inbreeding depression for SD and GY; and the favorable crosses for increasing GY were 190x107 and 190x190.Keywords: combining ability, REML, BLUP, plant breeding.Seleção de genitores em cruzamentos dialélicos em Jatropha curcas usando modelos mistos RESUMO. Cruzamentos dialélicos em esquema desbalanceado foram realizados em Jatropha para: (i) avaliar os componentes genéticos aditivos e não aditivos; (ii) selecionar genitores por meio da capacidade geral de combinação; (iii) estimar a capacidade especifica de cada cruzamento; (iv) verificar a existência de efeito materno e depressão endogâmica. O experimento foi conduzido em um arranjo dialelo completo com quatro genitores, desbalanceado para o número de cruzamentos. Foi utilizado um delineamento em blocos casualizados com 5 repetições e 3 plantas por parcela. As seguintes características foram avaliadas: diâmtro do caule (DC), número de ramos (NR), altura de plantas (AP), projeção da copa nas linhas (PCL), projeção da copa emtre linhas (PCE), e produtividade (P). As estimativas de variâncias foram obtidas utilizando o método da máxima verossimilhança restrita, e os valores genéticos foram estimados pelo melhor preditor linear não viesado. Concluiu-se que: O efeito aditivo foi predominante no controle genético para DC, PCL e PCE; o efeito de dominância foi predominante para AP, NR e P; existe efeito citoplasmático e genes nucleares do genitor feminino para todos os caracteres avaliados; os genitores 107 e 190 são os mais promissores para redução do porte e aumento na produtividade de grãos; existe depressão por endogamia para DC e P, e os cruzamentos favoráveis para incremento em P foram 190x107 e 190x190.Palavras-chave: capacidade de combinação, REML, BLUP, melh...

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“…Resultados similares foram obtidos em outros trabalhos com a cultura do pinhão-manso (Laviola et al 2012(Laviola et al , 2014Everson et al 2013;Brasileiro et al 2013;Wani et al 2012).…”

Section: Resultsunclassified

Contribuição de caracteres agronômicos para a produtividade de grãos em pinhão-manso

et al. 2015

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Resumo: O conhecimento da associação entre os caracteres que compõem a produtividade é importante para a seleção de plantas superiores, principalmente para garantir que o ganho genético ocorra para os diversos caracteres favoráveis. No pinhão-manso, a produtividade de grãos é o principal alvo do programa de melhoramento, porém existem outros caracteres importantes que impactam na produção. Diante desse contexto, o objetivo deste trabalho foi estimar, por meio de análise de trilha, os efeitos diretos e indiretos de caracteres vegetativos sobre a produtividade de grãos de pinhão-manso. Aos 18 meses após o plantio, foram mensurados os caracteres altura de plantas, diâmetro do caule, número de ramos por planta, projeção da copa na linha, projeção da copa na entrelinha e produtividade de grãos. Foram estimadas as correlações fenotípicas entre os caracteres avaliados, sendo essas correlações desdobradas, por meio da análise de trilha, em efeitos diretos e indiretos, considerando-se o caráter produtividade de grãos como a variável dependente principal. Observou-se que 76% da variação em produtividade foi explicada pelas variáveis explicativas, valor este superior ao observado em outros estudos e adequado para explorar os ganhos com a seleção direta e indireta em pinhão-manso. Os caracteres diâmetro do caule, massa de cem sementes e projeção da copa na entrelinha influenciam diretamente a produtividade de grãos, sendo indicados para seleção direta, assim como para a seleção indireta de progênies superiores de pinhão-manso para produtividade de grãos.Palavras-chave: análise de trilha, correlações, efeitos diretos e indiretos, Jatropha curcas. AbstRAct:The knowledge of the association between traits of production is important for selecting superior plants and mainly to ensure that the genetic gain occurs for many favorable traits. In physic nut, grain yield is the main goal of the breeding program, but there are other important traits that have an impact on production.On such background, the aim of this study was to estimate, using path analysis, direct and indirect effects of vegetative traits on the grain yield of physic nut. At 18 months after planting, the traits plant height, stem diameter, number of branches per plant, plant canopy projection on the line, plant canopy projection between rows and grain yield were measured. Phenotypic correlations among traits were estimated and unfolded in direct and indirect effects through path analysis, considering the grain yield as the main dependent variable. It was observed that 76% of the variation in yield was explained by the explanatory variables; this value is higher than those observed in other studies and appropriate to explore the gains from direct and indirect selection on physic nut. Stem diameter, weight of 100 seeds and canopy projection between rows directly influence the grain yield, being suitable for direct as well as indirect selection of physic nut superior progenies for grain yield.

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Estimates of genetic parameters for physic nut traits based in the germplasm two years evaluation

Abstract: In spite of increasingly widespread interest in planting physic nut, breeding efforts are still in its infancy. In that context, an important resource recently established aiming

Cited by 36 publications

References 8 publications

Path analysis and canonical correlations for indirect selection of Jatropha genotypes with higher oil yield

Path analysis and canonical correlations for indirect selection of Jatropha genotypes with higher oil yield

<b>Parental selection in diallel crosses of <i>Jatropha curcas</i> using mixed models

Contribuição de caracteres agronômicos para a produtividade de grãos em pinhão-manso

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