Resumo -O objetivo deste trabalho foi estimar o coefi ciente de repetibilidade em laranjeiras-doces e o número mínimo de avaliações a serem feitas para a determinação do valor real dos indivíduos. De março a junho de 1999, foram coletadas borbulhas de laranjeiras pé-franco, em fase de produção, em nove municípios do Acre. As borbulhas foram enxertadas sobre porta-enxertos de limoeiro 'Cravo', o que resultou em 54 clones. Esses clones foram avaliados em conjunto com a cultivar Aquiri, recomendada para o Estado. O delineamento experimental foi o de blocos ao acaso, com 55 tratamentos (55 clones), três repetições, com uma planta por parcela. O número total de frutos por planta, a produção de frutos por planta e o peso médio de fruto foram avaliados em 2002, 2003, 2004, 2005, 2006 e 2008. Foram realizadas as análises de variância, de componentes principais e estrutural. A estimativa de repetibilidade para peso médio do fruto demonstrou regularidade na classifi cação dos clones, de um ciclo para outro, e foram necessários cinco ciclos de avaliação para a predição do valor real dos indivíduos, com acurácia de 90%, pelo método dos componentes principais (matriz de co-variância). Apesar de as características número de frutos total por planta e produção de frutos por planta serem infl uenciadas pelo ambiente, oito e nove medições, respectivamente, permitem obter coefi cientes de determinação de 95%.Termos para indexação: Citrus sinensis, análise estrutural, análise multivariada, melhoramento genético, seleção clonal. Estimate of repeatability of traits of sweet orange tree production in Acre, BrazilAbstract -The objective of this study was to estimate the repeatability coeffi cient in sweet orange and the number of repeated measures that should be performed for an effi cient selection of genotypes. From March to June 1999, chips were collected from producing sweet orange seedlings, in nine municipalities of Acre, Brazil, and were grafted on 'Rangpur' lime rootstock, resulting in 54 clones, which were evaluated together with the cultivar Aquiri, recommended for the state. The experiment was carried out in a randomized complete blocks design, with 55 treatments, three replicates and one plant per plot. Fruit number per tree, fruit production per tree and average fruit weight were evaluated in 2002, 2003, 2004, 2005, 2006 and 2008. Analysis of variance, analysis of principal components, and structural analysis were performed. The estimate of repeatability for average fruit weight showed regularity in the ranking of clones, from one cycle to another, and fi ve cycles of assessments were necessary to predict the real value of clones, with accuracy of 90%, when principal components method (matrix of co-variance) was used. Although the number of fruits per plant and fruit yield per plant are infl uenced by the environment, eight and nine measurements, respectively, would achieve determination coeffi cients of 95%.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.