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Capacidade combinatória de linhagens de piment o a partir de análise dialélica multivariada = Combining ability of sweet pepper lines by multivariate diallel analysis

Keywords: Capsicum annuum , heterose , efeito gênico , sele o , heterosis , gene effects , selection

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Abstract:

O trabalho teve como objetivo gerar informa es sobre a capacidade combinatória de linhagens de piment o por meio da análise dialélica multivariada. Foram utilizadas 13 linhagens de piment o previamente selecionadas com base na rea o ao mosaico amarelo do piment o, sendo oito linhagens com rea o do tipo resistência e cinco com rea o do tipo suscetibilidade, num dialelo 8 x 5, mais as linhagens parentais. Os 53 tratamentos foram avaliados em estufa em delineamento de blocos casualizados com quatro repeti es, sendo avaliadas a produ o total e precoce de frutos, massa média de frutos e altura de plantas. A partir dessas quatro características foi realizada a análise dialélica univariada e multivariada. A análise dialélica multivariada apresentou resultados semelhantes às análises dialélicas univariadas, com predominancia dos efeitos n o-aditivos. Estimativas favoráveis para CGC ocorreram para as características produ o total e precoce de frutos nas linhagens PIX-031D-188-14-10 e PIM- 013 nos grupos 1 e 2, respectivamente. As linhagens PIX-031D-171-10-10, PIX-031D-188-14-05 e PIM-004 destacaram-se para massa média de frutos e altura de plantas. As estimativas de CEC variaram bastante para as características avaliadas. A utiliza o da análise dialélica multivariada é uma boa op o para escolha de genitores, pois considera vários caracteres simultaneamente. The objective of this work was to obtain information on the combining ability of sweet pepper lines by multivariate diallel analysis. Thirteen sweet pepper lines previously selected based on the reaction of sweet pepper yellow mosaic, being eight lines with resistance reaction and five susceptible lines, were used in a 8x5 partial diallel evaluated with the parental lines. The 53 genotypes were evaluated in greenhouse trials in a randomized blocks design with four replications. The traits total fruit yield, early fruit yield, mean fruit mass and plant height were evaluated. From these four traits, a univariate and multivariate diallel analysis was performed. Multivariate diallel analysis results were similar to those from univariate diallel analyses, with a predominance of non-additive effects. Favorable estimates of the GCA occurred for total fruit yield and early fruit yield in PIX-031D-188- 14-10 and PIM- 013 in groups 1 and 2, respectively. The PIX-031D-171-10-10, PIX-031D-188-14-05 and PIM-004 lines were higher for mean fruit mass and plant height. The SCA estimates varied considerably for the evaluated features. Multivariate diallel analysis is a good option for parental choice, since it consid

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