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.
ABSTRACT. Breeding programmes must be improved to accelerate the development of new cultivars due to the commercial importance of passion fruit. This study compared four selection indexes and the REML/BLUP methodology in an assessment of predicted genetic gains in the traits of interest. A total of 81 full-sib progenies derived from the third cycle of recurrent selection were assessed for one harvest in one environment. The experiment was arranged in a randomized complete block design with five plants per plot. The following traits were assessed: number of fruits, total yield, fruit mass, fruit longitudinal diameter, fruit transverse diameter, fruit pulp percentage, shell thickness and content of soluble solids. The Mulamba & Mock index produced the best results for the selection of progenies. The REML/BLUP method was the most efficient and selected progenies with predicted genetic gains better than the selection indexes tested.Keywords: mixed models, Passiflora edulis Sims, predicted genotypic values, simultaneous selection.Predição de ganhos genéticos por índices de seleção e metodologia REML/BLUP em uma população de maracujá-azedo sob seleção recorrente RESUMO. Tendo em vista a importância do cultivo do maracujazeiro, é de grande relevância o aprimoramento dos trabalhos de melhoramento genético a fim de possibilitar com maior rapidez o desenvolvimento de novas cultivares. O objetivo do presente trabalho foi comparar quatro índices de seleção e o método REML/BLUP na avaliação de ganhos genéticos preditos das características de interesse. Foram avaliadas 81 progênies de irmãos-completos, oriundas do terceiro ciclo de seleção recorrente, em uma safra, em um ambiente. O delineamento experimental utilizado foi o de blocos ao acaso com parcelas constituídas por cinco plantas. As características avaliadas foram: número de frutos, produção total, massa do fruto, diâmetro longitudinal do fruto, diâmetro transversal do fruto, porcentagem de polpa do fruto, espessura da casca e teor de sólidos solúveis totais. O índice de seleção de Mulamba & Mock proporcionou os melhores resultados para a seleção das progênies. O método REML/BLUP mostrou-se mais eficiente, tendo selecionado progênies com ganhos genéticos preditos melhores que os dos índices de seleção testados.Palavras-chave: modelos mistos, Passiflora edulis Sims, valores genotípicos preditos, seleção simultânea.
Passion fruit belongs to the family Passifloraceae, and the genus Passiflora is regarded the most economically important. The present study aimed to quantify genetic diversity among progenies of sour passion fruit, in order to define potential heterotic groups, based on morpho-agronomic descriptors, using the Ward-MLM procedure. It is useful for generation advancement in the passion fruit breeding program, via recurrent selection, under development at the Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF). For such, 81 full-sib progenies belonging to the third recurrent selection cycle (C03) were assessed. Twenty-three descriptors were used, five of which were qualitative and 18, quantitative. The quantitative and qualitative variables were analyzed simultaneously using the Ward-MLM procedure for the composition of groups. The likelihood function determined that five was the ideal number of groups. The Ward-MLM classification strategy for morpho-agronomic data analysis allowed the formation of five groups into 26, 5, 15, 16 and 19 progenies. A certain distance was observed for group III, compared to the other groups while groups I, II, IV and V showed approximation. This greater distance of group III compared to the other groups may indicate crosses, aiming at the exploitation of heterosis, for the pyramiding of favorable alleles for traits of interest. The Ward-MLM statistical procedure was a useful tool to detect genetic divergence and group progenies using simultaneously quantitative and qualitative variables.
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