Estimates of repeatability coefficients and optimum number of measures for genetic selection of Cynodon spp

The genus Cynodon includes species that have huge potential to produce high-quality fodder, for grazing and hay production. In perennial forage breeding, selection should be performed based on repeated measurements in the same individual over time, which maximizes the selective efficiency. Thus, the...

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Veröffentlicht in:Euphytica 2020-05, Vol.216 (5), Article 70
Hauptverfasser: Ferreira, Filipe Manoel, de Carvalho Rocha, João Romero do Amaral Santos, Alves, Rodrigo Silva, Elizeu, Arthur Mayrink, Benites, Flávio Rodrigo Gandolfi, de Resende, Marcos Deon Vilela, de Souza Sobrinho, Fausto, Bhering, Leonardo Lopes
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container_title Euphytica
container_volume 216
creator Ferreira, Filipe Manoel
de Carvalho Rocha, João Romero do Amaral Santos
Alves, Rodrigo Silva
Elizeu, Arthur Mayrink
Benites, Flávio Rodrigo Gandolfi
de Resende, Marcos Deon Vilela
de Souza Sobrinho, Fausto
Bhering, Leonardo Lopes
description The genus Cynodon includes species that have huge potential to produce high-quality fodder, for grazing and hay production. In perennial forage breeding, selection should be performed based on repeated measurements in the same individual over time, which maximizes the selective efficiency. Thus, the objectives of this study were to estimate the coefficients of repeatability and optimal number of measures for the genetic selection of Cynodon spp. clones. We evaluated 202 clones, being five checks, during four harvests, in augmented block design. A mixed model methodology (REML/BLUP) was used to estimate the variance components and predict the genotypic values. The repeatability coefficient for plant height, green weight, dry matter, and plant vigor were equal to 0.50, 0.67, 0.25, and 0.73, respectively. The accuracies obtained by performing m repeated measures revealed that 5, 2, 13, and 2 measurements are required to attain an accuracy ≥ 90% in genetic gain from the selection for plant height, green weight, dry matter, and plant vigor, respectively. Furthermore, the efficiency of performing four measurements compared with that of performing only one measurement was 27%, 15%, 51%, and 12% for plant height, green weight, dry matter, and vigor, respectively. In addition, the additive index, adopting a 10% selection intensity, was used in simultaneous selection, leading to desirable genetic gains for plant height, green weight, and plant vigor. In conclusion, the use of the repeatability coefficient suggests performing three measurements to obtain a high accuracy and good efficiency on the selection of superior genotypes of Cynodon spp.
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subjects Agriculture
Agronomy
Biomedical and Life Sciences
Biotechnology
Cloning
Coefficients
Cynodon
Dry matter
Efficiency
Fodder
Forage
Genetic improvement
Genotypes
Horticulture
Life Sciences
Life Sciences & Biomedicine
Optimization
Plant Genetics and Genomics
Plant Pathology
Plant Physiology
Plant Sciences
Reproducibility
Science & Technology
Vigor
Weight
title Estimates of repeatability coefficients and optimum number of measures for genetic selection of Cynodon spp
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