Navegando por Autor "Spinelli, Victor Mouzinho"

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Contribution of agronomic traits to the coffee yield of Coffea canephora Pierre ex A. Froehner in the western amazon region
(Editora UFLA, 2018-07) Spinelli, Victor Mouzinho; Moraes, Marcos Santana; Alves, Darlan Sanches Barbosa; Rocha, Rodrigo Barros; Ramalho, André Rostand; Teixeira, Alexsandro Lara
The evaluation of morphological characters related to the hulled coffee yield subsidizes the selection of Coffea canephora plants that combine a set of favorable traits. The aim of this study was to evaluate the direct and indirect effects of agronomic traits on the production of hulled coffee to subside the plant selection. To this, nine morphological descriptors were evaluated of 130 clones of the botanical varieties Conilon and Robusta over two crop years in the experimental field of Embrapa, in the municipality of Ouro Preto do Oeste, state of Rondônia (RO). To quantify the genetic variability the path analysis and the Scott Knott cluster test were used. The effect of genotype x year interaction was significant for eight of the nine characteristics analyzed. The genotypes were clustered in three to five classes, subsidizing the establishment of a scale to evaluate the variability of this genetic resource. Pathway analysis indicated that the number of plagiotropic branches and the number of rosettes per productive branch were the traits that exhibited the greatest direct effect on hulled coffee yield. These results show that it is possible to select plants with complementarity traits which favor a higher production of hulled coffee.
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 Mouzinho
The 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.
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 Lara
The 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.