Published

2020-05-01

Expected genetic gains from mono trait and indexbased selection in advanced bread wheat (Triticum aestivum L.) populations

Ganancia genética esperada en la selección basada en rasgos únicos e índices en una población avanzada de trigo pan (Triticum aestivum L.)

Keywords:

Drought, Genetic gain, Index, Simultaneous selection, Yield (en)
Sequía, Ganancia genética, Índice, Selección simultánea, Rendimiento (es)

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This study aimed at evaluating the expected gains from selection obtained based upon direct, indirect, and index-based selection in a set of 599 bread wheat lines. The experiment was carried out at the experimental field of INRAA institute, Setif research unit (Algeria), in a Federer augmented block design including three controls. A wide range of genetic variability was observed among lines for the eleven traits assessed. The results indicated that index-based selection and selection based on grain yield expressed higher expected genetic gain than direct and indirect mono-trait-based selection. The best 15 selected lines exhibited higher grain yield than the control varieties, and they were clustered in three groups that contrasted mainly for the flag-leaf area, thousand-kernel weight, biomass, and harvest index. The index-based selection appears as a useful tool for the rapid selection of early filial generations, enriching selected breeding materials with desirable alleles and reducing the number of years required to combine these traits in elite varieties.

Este estudio investigó los beneficios esperados de la selección obtenida en base al índice directo, indirecto y basado en la selección en un conjunto de 599 líneas de trigo panadero. El experimento se llevó a cabo en el campo experimental del instituto INRAA, unidad de investigación de Setif (Argelia), en un diseño de bloques aumentados Federer que incluye tres controles. Se observó un gran rango de variabilidad genética entre las líneas para los once rasgos evaluados. Los resultados indicaron que la selección basada en índices y la selección basada en el rendimiento de grano expresaron una mayor ganancia genética esperada que la selección directa e indirecta basada en rasgos individuales. Las 15 primeras líneas seleccionadas exhibieron un mayor rendimiento de grano que los controles y se agruparon en tres grupos que divergieron de manera eficiente para el área de la hoja bandera, el peso de mil granos, la biomasa, el rendimiento de grano y el índice de cosecha. La selección basada en índices aparece como una herramienta útil para la selección rápida de las primeras generaciones filiales; enriqueciendo materiales de reproducción seleccionados con alelos deseables y reduciendo el número de años necesarios para combinar estos rasgos en variedades de élite.

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