Selection of Coffea canephora parents from the botanical varieties Conilon and Robusta for the production of intervarietal hybrids

Abstract

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 16-1-81I, 9-1-82L, and 13-1-61I parents of the botanical variety Robusta and the 167I, 890E, and 130I parents of the Conilon botanical variety presented greater potential for obtaining selection gains.

Adaptability and stability of Coffea canephora Pierre ex Froehner genotypes in the Western Amazon

“…The high vigor of the hybrids formed through the breeding of genetically divergent parents Moraes et al is a characteristic of this species (OLIVEIRA et al, 2018;MONTAGNON et al, 2008;ROCHA et al, 2014). In 2004 were conducted hybridizations between matrices of the botanical varieties Conilon and Robusta, aiming to obtain plants that associate the best traits of their parent botanical varieties within the hybrid vigor (TEIXEIRA et al, 2017).…”

Selection of conilon coffee clones tolerant to pests and diseases in Minas Gerais

“…The existence of genetic variability and selective potential among the conilon coffee genotypes was also demonstrated in other studies of genetic divergence through multivariate techniques using the mixed model method employed in populations of conilon (Silva et al 2017, Oliveira et al 2018. Ferrão et al (2017) recommend that "Conilon" clonal coffee cultivars be made up of a combination of at least eight different genotypes, although new clonal varieties have been developed by grouping nine to 14 genotypes.…”

Resistance of new Coffea canephora clones to root-knot nematode (Meloidogyne incognita) in the western amazon

“…Seventeen previously selected genotypes (Oliveira et al, 2018b;Spinelli et al, 2018) were evaluated by the following morphological and productive traits: plant height, number of productive plagiotropic branches, distance between rosettes of the plagiotropic branch, number of coffee beans per rosette, number of rosettes per plagiotropic branch, length of plagiotropic branch, length and width of leaves, number of days for fruit ripening and coffee bean size. The genotypic value of production was estimated based on production of hulled coffee using the BLUP (Best Linear Unbiased Prediction) method (Table 1).…”