Combined Selection in Backcross Population of Papaya(Carica papaya L.)by the Mixed Model Methodology
作者机构：Laboratory of Plant BreedingCentre for Agricultural Sciences and TechnologyNorth Fluminense State University(UENF)Campos dos GoytacazesBrazil Caliman Agrícola S.A.LinharesBrazil
出 版 物：《American Journal of Plant Sciences》 (美国植物学期刊（英文）)
年 卷 期：2014年第5卷第20期
页 面：2973-2983页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
基 金：the Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro(FAPERJ)for providing the Master’s scholarship the Empresa Caliman Agrícola S/A(Caliman)for the financial and logistical support
主 题：Papaya Tree Backcross Selection Index Mixed Model REML/BLUP
摘 要：The selection of superior genotypes based on the simultaneous response to several characteristics of agronomic importance is a key strategy to overcome the scarcity of available varieties of papaya. This study aimed to apply the combined selection by using distinct selection indexes based on both the genetic values obtained by the REML/BLUP methodology and the real measured values to select agronomically superior genotypes of papaya within backcross progenies. The combined selection was carried out based on genetic and phenotypic values, original and standardized, multiplied by the agronomic weights. The results of the analysis of genetic parameters indicate that the evaluated progenies have expressive genetic variability for the considered traits, and that there are real possibilities of genetic progress with the selection. Among the analyzed indexes, the one based on standardized genetic value presented greater consistency in the ranking of genetic material, demonstrating the advantage of data standardization. Five progenies belonging to the BC1 generation, and five to the BC3 generation were selected using this index. A total of 27 plants ag-ronomically superior were selected within the top five progenies and recommended for generation advance, 23 being selected by combined selection and 4 using the direct selection for the four mainly characters in papaya breeding program: production, pulp and fruit firmness and soluble solids. Beyond the selection of superior genotypes for the development of future inbred lines, this study also allowed defining the best strategy to apply the combined selection in papaya using pre-dicted breeding values obtained by BLUP. This strategy may allow higher accuracy in the selection process, thus increasing the chances of success of the breeding programs.
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