Seleção de progênies F4 de cafeeiros utilizando o procedimento REML/BLUP

Abstract

The objective of this research was to select coffee trees progenies in the F4 generation, for to agronomic traits and disease resistance, by the procedure REML/BLUP. The experiment was conducted at the Experimental Farm EPAMIG in Machado - Minas Gerais, the research was carried out with 33 progenies derived from “Icatu” x Catuaí Yellow IAC 62 and IAC 17 and the progenies IAC 5002 and IAC 5010. The experimental design was a square lattice with four replications and evaluations carried out during two years (2010 and 2011). The traits evaluated were: yield (bags.ha-1), production (liters.plant-1), reaction to rust, vegetative vigor, reaction to cercospora and percentage of grains retained in sieve ‘17 and above’. It was found by means of genetic parameters which yield, reaction to rust and sieve ‘17 and above’, the selection from progenies would provide higher gain, and the progenies 2 and 4 showed good performance for all variables. However for production, reaction to cercospora and vegetative vigor, the selection between plants would be more advantageous. It was used 5% of the selection intensity, totaling 72 plants from the individual genetic effect for production and consequently for reaction to cercospora and vegetative vigor. The additive genetic gain predicted with the selection was 16,84, 16,59 and 2,19% for production, reaction to cercospora and vegetative vigor, respectively. It was concluded from this population is possible to obtain superior progenies for resistance to rust and grain from high sieve and the plants selection facilitates the choice of the genetically superior individuals, and maximizing genetic gain per selection cycle