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Genetic parameters and selection indexes in F2 and F2:3 soybean populations
Author(s) -
Silva Carolina Oliveira,
Hamawaki Osvaldo Toshiyuki,
Nogueira Ana Paula Oliveira,
Almeida Myckell Ramos Campos de,
Castro Douglas Goulart,
Marques Fábio Serafim,
Lemes Hamawaki Raphael,
Hamawaki Cristiane Divina Lemes,
Cardoso Gabriela Marques,
Diniz Victor Hugo Rodrigues
Publication year - 2021
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.1002/agj2.20692
Subject(s) - ideotype , selection (genetic algorithm) , heritability , genetic gain , biology , randomized block design , point of delivery , genotype , plant breeding , microbiology and biotechnology , statistics , horticulture , agronomy , genetic variation , mathematics , genetics , cultivar , artificial intelligence , computer science , gene
The evaluation of genetic parameters in early generations select individuals in F 2 and F 2:3 and advancing only progenies with the potential to generate pure productive lines. The objectives of this study were to estimate genetic and phenotypic parameters in F 2 and F 2:3 populations derived from UFUS 7415 and TMG 7161 RR, evaluate different genotype selection strategies, and select progenies to improve agronomic traits. Populations in the F 2 and F 2:3 generations derived from a biparental cross between the parents UFUS 7415 and TMG 7161 RR were evaluated. The genetic parameters of 360 individuals in the F 2 generation and 150 genotypes of each parent were evaluated. Heritability varied from 4.66% for the number of seeds per pod to 86.06% for plant height at flowering. The greatest selection gain was obtained for plant height at flowering (29.68%), related to grain production. In the F 2:3 generation, 145 genotypes were evaluated and their parents, in a randomized block design with two replications. The correlations between characters and the genetic gains obtained by direct and indirect selection and based on the genotype–ideotype distance index and the Mulamba and Mock index of the sum of “ranks” were evaluated. With direct selection, selection gains ranged from –5.34 to 16.19%. The genotype–ideotype distance index showed a total selection gain of 40.49%, while the Mulamba and Mock index of the sum of ranks obtained a total gain of 39.35%. Twenty‐three genotypes were selected for the characters evaluated with both indexes in the F 3 generation.