Genetic parameters and selection of biofortified lettuce genotypes based on selection indices/Parametros geneticos e selecao de genotipos de alface biofortificadas com base em indices de selecao.

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Publisher: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
Document Type: Article
Length: 4,602 words

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Abstract :

HIGHLIGHTS: There is genetic variability in the germplasm of biofortified lettuce. There is a positive genotypic correlation between agronomic traits in biofortified lettuce. Smith-Hazel, Williams, and Mulamba & Mock indices showed good direct gains in biofortified lettuce genotypes. Obtaining biofortified vegetables with an emphasis on lettuce is a tool to improve the nutritional status of the population. Selection indices can maximize the simultaneous selection of good agronomic traits and high carotenoid levels. The objective of this study was to estimate the genetic parameters and efficiency of different indices in selecting genotypes of biofortified lettuce with high concentrations of carotenoids and favorable agronomic traits. Statistical analyses were performed on 91 genotypes belonging to the vegetable germplasm bank of the Federal University of Uberlandia, Brazil. The variables analyzed were the chlorophyll index of the leaves, plant diameter, stem diameter, and number of leaves per plant. The values found for narrow sense heritability (h (2) ) ranged from 89.63% (stem diameter) to 96.05% (chlorophyll), showing a high magnitude. The Smith-Hazel index, sum of ranks by the Mulamba & Mock index, direct and indirect selection, and Williams base index were used to predict the selection gains. A total of 17 individuals were selected using the selection methodologies. The Smith-Hazel, Williams, and Mulamba & Mock indices were efficient in showing good direct gains for the evaluated traits. Thirteen genotypes were selected for all indices presenting suitable agronomic traits, which show promise for advancing generations within the breeding program to obtain biofortified lettuce strains. Keywords: Lactuca sativa L., biofortification, correlation, selection gain A obtencao de vegetais biofortificados, com destaque para a alface, e uma ferramenta para melhorar o estado nutricional da populacao. Os indices de selecao podem maximizar a selecao simultanea de boas caracteristicas agronomicas e altos niveis de carotenoides. O objetivo deste estudo foi estimar os parametros geneticos e a eficiencia de diferentes indices para a selecao de genotipos de alface biofortificados combinados com caracteristicas agronomicas adequadas. As analises estatisticas foram realizadas com 91 genotipos pertencentes ao banco de germoplasma de alface biofortificada da Universidade Federal de Uberlandia. As variaveis analisadas foram: indice de clorofila das folhas, diametro da planta, diametro do caule e numero de folhas por planta. Os valores encontrados para herdabilidade no sentido restrito ([h.sup.-2]) variaram de 89,63% (diametro do caule) a 96,05% (clorofila), apresentando alta magnitude. O indice de Smith-Hazel, a soma de "ranks" de Mulamba & Mock, a selecao direta e indireta e o indice base de Williams foram usados para prever os ganhos de selecao. No total, 17 individuos foram selecionados usando as metodologias de selecao. Os indices de Smith-Hazel, Williams e Mulamba & Mock sao eficientes em mostrar bons ganhos diretos para as caracteristicas avaliadas. Treze genotipos foram selecionados por todos os indices apresentando caracteristicas agronomicas favoraveis, sendo promissores para o avanco de geracao no programa de melhoramento para obter linhagens de alface biofortificadas. Palavras-chave: Lactuca sativa L., biofortificacao, correlacao, ganho de selecao

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Gale Document Number: GALE|A674989396