Seleção Recorrente Intrapopulacional Em Maracujazeiro-Azedo via Modelos Mistos

Abstract

RESUMO -o maracujazeiro pertence ao gênero Passiflora, considerado o de maior importância econômica da família Passifloraceae. O objetivo do trabalho foi estimar para o maracujazeiro-azedo parâmetros e valores genotípicos pelo procedimento Reml/BluP em nível de progênie. Foram avaliadas 27 progênies de meiosirmãos oriundas do segundo ciclo de seleção recorrente conduzido na uenF, selecionadas via índice de seleção. as características avaliadas foram: número de frutos por parcela (nF); massa total de frutos por parcela (mTF) e massa média de frutos (mmF). os valores genéticos foram estimados por meio do Software Selegen, utilizando o procedimento Reml/BluP. nas estimativas dos parâmetros genéticos via Reml, as duas características ligadas diretamente à produção e, portanto, consideradas as mais importantes, nF e MTF apresentaram estimativas de herdabilidade média de progênies de 0,395 e 0,439, respectivamente. Na seleção e nas estimativas dos ganhos via BluP, o coeficiente de coincidência revelou concordância do resultado da seleção entre as progênies, mostrando que para as três características avaliadas, as mesmas 8 progênies são superiores para as três características simultaneamente. a metodologia Reml/BluP mostrouse adequada para a avaliação, possibilitando obter estimativas dos parâmetros genéticos e fenotípicos que revelaram a possibilidade de sucesso com a seleção de progênies superiores, com ganhos simultaneamente de 18,02%, 23,08% e 9,65% para NF, MTF e MMF, respectivamente. Termos para indexação: Passiflora edulis Sims, modelos mistos, seleção recorrente. INTRAPOPULATION RECURRENT SELECTION IN SOUR PASSION FRUIT BY MIXED MODELSABSTRACT -Passion fruit belongs to the family Passifloraceae, and the genus Passiflora is regarded the most economically important. The aim of this study was to estimate parameters and genotypic values by REML/ BLUP method in level of progenies. A total of 27 half-sib progenies of the sour passion fruit derived from the second cycle of recurrent selection conducted in UENF, selected by the selection index were evaluated. The characteristics evaluated were: number of fruits (NF), total fruit mass (TFM) and fruit average mass (FAM). Breeding values were estimated by the Software SELEGEN using the procedure REML/BLUP. In the estimates of genetic parameters by REML, both characteristics directly linked to production and thus considered the most important (NF and TFM) showed average heritability estimates of progenies of 0.395 and 0.439, respectively. The selection and BLUP estimates of earnings by the coefficient of coincidence revealed agreement of the results of the selection among the progenies, showing that for all traits the same 8 progenies are superior to the three characteristics simultaneously. The REML/BLUP methodology was adequate for evaluation, allowing to obtain estimates of genetic and phenotypic parameters revealed that the possibility of successful selection of superior progenies, simultaneously with gains of 18.02%, 23.08% and 9.65% for NF, TFM and FAM, respectively.

Selection index based on phenotypic and genotypic values predicted by REML/BLUP in Papaya

“…According to Pinto et al (2013), the association between individual genotypic values obtained by REML/ BLUP and selection index was efficient at selecting individuals above the original population mean. Similarly, Pedrozo et al (2009) emphasized that the use of mixed models contributed to a greater accuracy in selection, and Ferreira et al (2016b) reported that mixed models are recommended for characteristics of low heritability, such as those obtained in the study. The SD values for severity of black-spot on leaves (BSL) and fruits (BSF) obtained by GVP was larger than that obtained by SM, which resulted in a better overall result.…”

“…Furthermore, one way to increase the effectiveness of selection would be to use individual genotypic values, which are additive and have greater accuracy (RAMOS et al, 2014;QUINTAL et al, 2017). These individual genotypic values can be estimated using mixed linear models of the restricted maximum likelihood/ best linear unbiased prediction type (REML/BLUP) (FERREIRA et al, 2016b;RESENDE, 2016).…”

Research Article Novel selection strategy for half-sib families of sour passion fruit <i>Passiflora</i> <i>edulis</i> (Passifloraceae) under recurrent selection

“…Even in the 4 th cycle of recurrent selection, there was still a difference within the evaluated families. Ferreira et al (2016) evaluated the second cycle of recurrent selection of passion fruit of UENF and observed highmagnitude estimates of heritability within families (0.65, 0.78, and 0.67 for NF, PT, and FM, respectively), suggesting that genetic gain was greater within than among families. In this case, selection can be performed among and within families to exploit the variability and increase genetic gains.…”

Non-destructive estimation of leaf area in passion fruit (Passiflora edulis L.)

“…The passion fruit belongs to the genus Passiflora, which is the most important genus in the family of Passifloraceae in the domestic fruit market (Ferreira et al, 2016). Among the species of this genus, the passion fruit (Passiflora edulis L.) is the most commonly grown for commercial purpose in Brazil (Bernacci et al, 2008).…”