Ciência Rural
URI permanente para esta coleçãohttps://thoth.dti.ufv.br/handle/123456789/10366
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Item Selection of Coffea canephora parents from the botanical varieties Conilon and Robusta for the production of intervarietal hybrids(Universidade Federal de Santa Maria, 2018-04) Oliveira, Leilane Nicolino Lamarão de; Rocha, Rodrigo Barros; Ferreira, Fábio Medeiros; Spinelli, Victor Mouzinho; Ramalho, André Rostand; Teixeira, Alexsandro LaraThe objective of this research was to quantify the genetic divergence of potential Coffea canephora parents, with the goal of developing progenies that associate the best traits of the Conilon and Robusta botanical varieties for hybrid vigor expression. Thus, 10 morphological and productive characteristics of 130 clones of Conilon and Robusta botanical varieties and their intervarietal hybrids were evaluated over 2 years. The experiment was conducted in a randomized block design with four replicates of four plants per plot. For selection of parents, the main component analysis was used to associate values with reference points obtained from the average of each botanical variety. The first two principal components allowed for the separation of the botanical varieties representing the variability contained in the original data with 76% for the first year and 69% for the second year. Although, the genotype × years interaction had significant effects, there were minor differences in the grouping from one year to the next, which is associated with the higher repeatability estimates observed in this study. It was observed that crosses with the 16-1-81 I , 9-1-82 L , and 13-1-61 I parents of the botanical variety Robusta and the 167 I , 890 E , and 130 I parents of the Conilon botanical variety presented greater potential for obtaining selection gains.Item Genetic progress with selection of Coffea canephora clones of superior processed coffee yield(Universidade Federal de Santa Maria, 2018-03) Silva, Dulcilene Oliveira da; Ferreira, Fábio Medeiros; Rocha, Rodrigo Barros; Espindula, Marcelo Curitiba; Spinelli, Victor MouzinhoThe aim of this study was to select Coffea canephora clones of superior processed coffee productivity based on the estimates of the genetic parameters and of genetic progress with the plant selection. For this, the production of processed coffee from 130 clones was evalu- ated from 2014 to 2016 in a clonal test, installed in randomized complete blocks with four plants per plot and six replications, spaced 3 × 2m at the experiment station Embrapa Rondônia in the municipality of Ouro Preto do Oeste - RO. The estimation of genetic parameters and predic- tion of genotypic values were performed using REML/BLUP procedure (Restricted Maximum Likelihood/Best Unbiased Linear Prediction). Estimates of the genetic parameters confirmed the predominance of the genetic component in the expression of this trait, indicating the possibil- ity of obtaining gains with the plant selection. Genetic progress of processed coffee productivity from the selection of 10% of the best clones was 49.88%, which is equivalent to an increase in average productivity from 42.57 bags.ha -1 to 66.95 bags.ha -1 . The use of the harmonic mean of the genetic values helped to identify the clones of superior performance, with higher adaptability and stability for the northern region of Brazil.