Divergência genética em clones superiores de Coffea canephora Pierre ex Froenher em Rondônia

Abstract

The objective of this work was to quantify the genetic divergence of potential C. canephora parents, aiming to develop progenies that associate the best traits of the Conilon and Robusta botanical varieties to the expression of the hybrid vigor. For this, ten morphological and productive characteristics of 130 clones of Conilon and Robusta botanical varieties and their intervarietal hybrids were evaluated over two years, considering an experiment in a randomized block design with four replicates of four plants per plot. For selection of parents, the main components technique was used associated with reference points obtained from the average of each botanical variety. The first two main components allowed the separation of the botanical varieties with a representation of the variability contained in the original data of 76% in the first year and 69% in the second year. Although the significance of the genotype x years interaction was significant, there was little difference 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, 13-1-61I and 11-1-42I parents of the botanical variety Robusta and with the 167I, 890P and 1048I parents of the Conilon botanical variety presented greater potential for obtaining selection gains.