Genetic parameters and selection of genotypes in rapeseed (Brassica napus) populations segregants by REML/BLUP in the Brazilian Cerrado.
2025
CANDIDO, W. dos S. | LAVIOLA, B. G. | GUIMARÃES, C. G. | RODRIGUES, E. V. | NUNES, V. R. | CAMARGO, J. P. de P. A. | WILLAME DOS SANTOS CANDIDO, UNIVERSIDADE FEDERAL DE SANTA CATARINA; BRUNO GALVEAS LAVIOLA, CNPAE; CÍNTIA GONÇALVES GUIMARÃES, UNIVERSIDADE FEDERAL DOS VALES DO JEQUITINHONHA E MUCURI; ERINA VITÓRIO RODRIGUES, UNIVERSIDADE DE BRASÍLIA; VITOR RODRIGUES NUNES; JOÃO PEDRO DE PAULA AIRES CAMARGO.
The objective of this study was to estimate genetic parameters in rapeseed populations, as well as to select individuals and families in populations with the potential for developing lines. Four experiments were conducted in the experimental field of Embrapa in 2022, evaluating populations of F2 progenies. We used a randomized block design for the experiments. Evaluations were carried out 110-120 days after planting. The traits were assessed: silique length (SL), number of siliques per plant (NSP), 1000-seed weight (W1000S), and yield (SY). Estimations of genetic parameters and the selection of individuals were carried out using the REML/BLUP method. The genetic gain through selection was estimated using the Mulamba and Mock index. Significant differences were observed among genotypes across all populations only for the NSP trait. For the W1000S and SY traits, significant differences were also found in the evaluated populations, except in the NACE-D and NACE-50 populations, respectively. However, for SL, no significant differences among genotypes were observed in the evaluated populations. The heritability ranged from 21.99% for the W1000S trait to 78.29% for NSP, in the NACE-D and NACE-61 populations, respectively. Genetic gains were high for SY and NSP in all populations, indicating that these genotypes exhibited high means for the traits. Most superior genotypes originated from the NACE-D (24.15%) and NACE-61 (22%) populations. This suggests that selection within these populations contributes to developing promising lines. The information from this study contributes to the efficiency of breeding programs conducted under tropical conditions.
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