Capacidade de combinação em sete populações de melancia

Ferreira, M. A. J. F.; Braz, Leila Trevisan; Queiróz, M. A. de; Churata-Masca, M G C; Vencovsky, Roland

doi:10.1590/s0100-204x2002000700010

Cited by 15 publications

(9 citation statements)

References 4 publications

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“…A CGC é atribuída a efeitos aditivos sendo que é importante o seu conhecimento em programas de melhoramento para a indicação e seleção de genitores (MAKANDA et al, 2010). A CEC está relacionada aos efeitos gênicos não-aditivos, que caracteriza a diferença das combinações híbridas em relação ao comportamento médio dos genitores (FERREIRA et al, 2002), o que contribui para a indicação da melhor combinação híbrida.…”

Section: Introductionunclassified

Capacidade combinatória e efeito recíproco em características agronômicas do feijão

et al. 2012

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ResumoO objetivo deste trabalho foi avaliar a capacidade geral de combinação dos genitores envolvidos nos cruzamentos e a capacidade específica de combinação dos híbridos, bem como o efeito recíproco em relação as características agronômicas em feijoeiro. Inicialmente foram realizados os cruzamentos dialélicos, intercruzando os seis genitores: Xan 159, Pérola, BAF 63, IPR Uirapuru, BRS Supremo, BRS Valente, gerando trinta e seis combinações. As sementes F 1 juntamente com os genitores foram levadas a campo em delineamento inteiramente casualizado com duas repetições, sendo que cada planta foi considerada uma unidade de observação, em que ocorre número desigual de plantas nas diferentes combinações híbridas. As plantas foram avaliadas quanto aos seis caracteres (ciclo, estatura de planta, inserção do primeiro legume, diâmetro do caule, número de legumes por planta e número de grãos por legume), sendo posteriormente realizadas as análises estatísticas utilizando o Método I de Griffing. Em relação à capacidade geral de combinação a cultivar Pérola é considerada promissora para o Planalto Catarinense. Com base na capacidade específica as melhores combinações foram Xan 159 x BRS Supremo, Xan 159 x BRS Valente, Pérola x BAF 63, BAF 63 x IPR Uirapuru e BAF 63 x BRS Valente. Os valores para o efeito recíproco também foram significativos indicando que existe a presença de efeito citoplasmático e de genes nucleares do genitor feminino nos caracteres avaliados. O genótipo indicado como um bom genitor feminino e masculino com base no efeito recíproco é o acesso BAF 63, quando se deseja aumentar EST e NLP. A linhagem Xan 159 foi promissora quando utilizada como genitor feminino para incrementar Ciclo, EST, IPL, DC, NLP e NGL. As cultivares BRS Valente e IPR Uirapuru são indicadas como genitores masculinos para proporcionar um aumento do Ciclo, EST, IPL, DC, NLP e NGL. Palavras-chave: Dialelo desbalanceado, dialell05SAS, Phaseolus vulgaris L AbstractThe objective of this study was to evaluate the general combining ability of parents involved in crosses, and specific combining ability of hybrids, as well as reciprocal effect on six agronomic traits in common

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Section: Introductionunclassified

Capacidade combinatória e efeito recíproco em características agronômicas do feijão

et al. 2012

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“…The general combining ability (GCA) is related to additive effects, representing the average parental performance in hybrid combinations, while the specific ability (SCA) is related to non-additive effects, traitizing the deviations of hybrid combinations from the average parental performance. The GCA allows the identification of parents with higher frequency of favorable alleles, while the SCA indicates the most promising hybrid combinations (Ferreira et al 2002, Valério et al 2009). In addition, the diallel scheme helps analyze the nature and magnitude of gene effects that control traits of economic importance.…”

Section: Introductionmentioning

confidence: 99%

Diallel analysis of yield and quality traits of melon fruits

Barros¹,

Nunes

Queiróz

et al. 2011

Crop Breed. Appl. Biotechnol.

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The purpose of this study was to estimate the general and specific combining ability of melon hybrids to identify the best combinations. Six parents and their respective hybrids were evaluated in a complete randomized block design with three replications. The following traits were assessed: total number of fruits, average fruit weight, yield, longitudinal diameter, transversal diameter, flesh thickness, internal cavity size, flesh firmness, and soluble solids. The traits total fruit number, yield, flesh firmness and soluble solids content are controlled by additive and non-additive effects, while average fruit weight, longitudinal diameter, flesh thickness, internal cavity size are controlled by additive effects. The most appropriate crosses for breeding of Cantaloupe, Honey dew, Piel del sapo, Meloa and Amarelo melon are, respectively: Gold Mine x Hy Mark, AF-646 x AF-1749, Meloa x Rochedo and AF-646 x Rochedo.

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“…Xiao et al (1996) demonstrated that the close relationship between genetic diversity of hybrids performance and heterosis in rice (Orzya sativa L. iaponica and Orzya sativa L. indica). There is general agreement that GCA and associated heterotic effects are important determinates of parental choice during hybrid melon development (Ferreira et al 2002;Souza et al 2002). Moreover, heterosis, as a function of performance, is often related to degree of genetic relatedness [i.e., genetic distance (GD)] and is dramatically influenced by growing environment.…”

Section: Introductionmentioning

confidence: 99%

Performance of melon hybrids derived from parents of diverse geographic Origins

Luan

Sheng

Wang³

et al. 2010

Euphytica

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Genetic relatedness and phenotype are important factors that govern the expression of heterosis in hybrid progeny of many cross-pollinating plant species. Since this relationship is important but not well understood in melon (Cucumis melo L.), one monoecious and two andromonoecious melon lines of diverse Chinese [Peoples Republic of China (PRC)] origin were crossed to the andromonoecious U.S. Western Shipping market type 'Top Mark' (TM) and the andromonoecious, highly branched line H-16 to determine parental combining ability and heterosis for five yield component traits in three test environments [open-field (USA), and energy-saving (PRC) and plastic greenhouses (PRC)]. Random amplified polymorphic DNA (RAPD)-and simple sequence repeat (SSR)-based genetic distances (GD) among and between parents (5) and their hybrids (6) were calculated and compared to phenotypic trait values. These germplasms were evaluated for lateral branch number (LBN), days to 50% flower (DF), fruit number and weight per plant, and fruit length:diameter (L:D) ratio in each of three test environments. General combining ability was significant for all characters, except for L:D in all locations, and LBN and DF in the plastic greenhouse environment. Both descriptors of difference (genetic marker and phenotype) were discriminatory, and provided similar assessments of relationships among parents and hybrids. Although dramatic performance differences were detected between parents and among F 1 hybrid progeny, a strong relationship between GD and heterotic effects was not consistently detected.

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Capacidade de combinação em sete populações de melancia

Cited by 15 publications

References 4 publications

Capacidade combinatória e efeito recíproco em características agronômicas do feijão

Capacidade combinatória e efeito recíproco em características agronômicas do feijão

Diallel analysis of yield and quality traits of melon fruits

Performance of melon hybrids derived from parents of diverse geographic Origins

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