Selection of progeny from the cross between Icatu and Catuai cultivars

Breeding programs should be dynamic and continuous in order to provide new coffee cultivars with complex resistance factors to be efficient barriers to new physiological races of the fungus H. vastatrix. In this context, the objective of this work was to evaluate the agronomic performance, the resistance to rust and the occurrence of brown eyespot in progenies derived from crosses between Catuaí and Icatu groups in two sites in the State of Minas Gerais. The experiments were carried out on EPAMIG Experimental Farms situated in São Sebastião do Paraíso and Três Pontas, State of Minas Gerais, Brazil. The experimental design was a 6 x 6 lattice square with three replications. The following characteristics were evaluated in the 2009/2010 and 2010/2011crop years in both sites: yield, vegetative vigor, percentage of grain size and response to rust and brown eyespot. Performance of the evaluated progenies for productivity in Três Pontas was higher than in São Sebastião do Paraíso. The progeny 6-47-10 H Hole 3 stood out among the most promising, suggesting good potential for genetic progress in selection. Progenies with resistance to rust were classified.咖啡育种计划需保持动态性与连续性，以培育出具备复合抗性因子的咖啡新品种，使其能作为有效屏障抵御咖啡驼孢锈菌（H. vastatrix）的新生理小种。在此研究背景下，本试验旨在评估巴西米纳斯吉拉斯州两个试验点中，由卡杜艾（Catuaí）群体与伊卡图（Icatu）群体杂交所得后代株系的农艺性能、抗锈性及褐斑病（brown eyespot）发生情况。本试验设于巴西米纳斯吉拉斯州的EPAMIG试验农场，分别位于圣塞巴斯蒂昂-杜帕拉伊索与特雷斯蓬塔斯。试验采用6×6格子方设计，设置3次重复。两个试验点均在2009/2010与2010/2011两个作物年度对以下性状开展调查：产量、营养生长势、籽粒大小占比以及对锈病和褐斑病的抗性表现。供试株系在特雷斯蓬塔斯的产量表现优于圣塞巴斯蒂昂-杜帕拉伊索。株系6-47-10 H Hole 3在所有候选株系中表现突出，表明其在选育过程中具备良好的遗传增益潜力。本研究对具备抗锈性的株系进行了分类。