Genotypic superiority of Psidium Guajava S1 families using mixed modeling for truncated and simultaneous selection

Abstract

The purpose of this study was to conduct selection, genetic parameter estimation, and prediction of genetic values for 18 S 1 families of guava trees using mixed model methodology and simultaneous selection of traits by means of the additive selection index, multiplicative selection index, and mean rank adapted from Mulamba. All families analyzed were obtained by means of self-fertilization of superior genotypes (full siblings) from the genetic breeding program of guava trees at the Universidade Estadual do Norte Fluminense. An experimental randomized block design with 18 S 1 families, three replicates, and ten plants per plot was used. A total of 540 genotypes (individual plants) of guava tree were evaluated. Genetic parameter estimation and selection of the best genotypes based on the genetic value were performed using the statistical procedure, from the Selegen-REML/BLUP program. The analyses of the additive selection index, multiplicative selection index, and the sum of rank adapted from Mulamba were also performed under the Selegen program. During the evaluation by the individual BLUPs, families 1, 12, 4, 6, and 8 contributed to most of the genotypes selected for the traits under evaluation, suggesting their significant potential to generate high quality and high yield genotypes. In the selection indexes via mixed models, the multiplicative index showed higher values for genetic gains (74 %), followed by the mean rank index adapted from Mulamba (19 %), and the additive index (2 %).

Strategies and Practical Aspects in Guava (Psidium Guajava L.) Breeding: 12 Years of Experiments

“…The other population of individuals resulting from self-pollination was evaluated to identify superior individuals via truncation selection (Ambrósio et al, 2021). To determine whether inbreeding depression occurred, a study of inbreeding depression based on seed attributes using S0, S1, and S2 families is being developed (in progress).…”

Phenomics approaches: genetic diversity and variance components in a S2 guava family by seed traits

“…In the accelerated aging test, seeds are subjected to high temperature and humidity conditions, which cause stress, before being taken to the germination test (Marcos Filho 1999). It should be noted that the S 1 genotypes, which were self-pollinated to obtain these individuals, underwent a process of evaluation of agronomic attributes (Ambrósio et al 2021), with emphasis given to their selection, aiming at fixing superior agronomic traits. Group 2 showed the highest means for the variables of germination percentage (GP) and histogram: HSL: hue: minimum index (H3).…”

Genetic Parameters, Prediction of Gains and Intraspecific Hybrid Selection of Paspalum notatum Flügge for Forage Using REML/BLUP

“…The plant breeding process is time consuming, expensive and laborious due to the prolonged period of experimental evaluation and selection of superior genotypes before commercialization [27,28]. Therefore, the adoption of more robust and efficient statistical methodologies is essential to guide the process of genetic gain, especially in perennial species [29].…”