Abstract This study aimed to identify promising arabica coffee genotypes for organic systems. The experiments were arranged in a randomized block design, with 30 genotypes and three replications. The adaptability and stability analysis was carried out using the modified centroid method, considering the mean yield of two biennia (2005/2006 and 2006/2007, 2007/2008 and 2008/2009) in three municipalities (Araponga, Espera Feliz, and Tombos), totaling six environments. Significant genotype x environment interaction was observed for yield, and the municipality of Espera Feliz was the only favorable environment. Genotypes were classified into four of the seven groups proposed by the modified centroid method: maximum general adaptability (I), minimum adaptability (IV), mean general adaptability (V), and mean specific adaptability to favorable environments (VI). Cultivars IBC Palma 1, CatucaíAmarelo24/137, Sabiá 708, and H 518 are widely adapted, stable, productive and suitable for organic farming.

Abstract In breeding programs, understanding the potential of parents should be a way to spend significantly less time and costs to obtain new cultivars. For this, the objective of this study was to estimate the general and specific combining ability of parents aiming common bean breeding for resistance to Fusarium wilt (FW) based on disease severity and reduction in plant growth. Eight common bean genotypes were crossed in a 3 x 5 partial diallel mating scheme to obtain F1 hybrids. The parents and their 15 F1 hybrids were evaluated for severity of Fusarium wilt, area under the disease progress curve, percentage of plant height reduction and plant shoot fresh weight reduction and grain yield. The resistance of common bean to FW is controlled by a few dominant genes. The reduction in plant growth is controlled by a different set of genes that can increase the selection efficiency of parents for common bean breeding.

Este trabalho teve como objetivo comparar a adaptabilidade e estabilidade de cultivares de café quanto à média de produtividade anual e de biênios, pelo método de EBERHART & RUSSEL (1996), e selecionar cultivares de café para o cultivo orgânico em Minas Gerais. Os experimentos foram conduzidos em três locais, em delineamento de blocos casualizados com trinta genótipos e três repetições. Uma análise se baseou na produtividade média anual de quatro colheitas (2005/2006, 2006/2007, 2007/2008 e 2008/2009) com o total de doze ambientes. A outra análise considerou a média de dois biênios (2005/2006 e 2006/2007; 2007/2008 e 2008/2009) com o total de seis ambientes. A análise em que se considerou a média da produtividade do biênio apresentou redução expressiva do coeficiente de variação ambiental. Por isso, foi possível identificar mais cultivares com adaptabilidade e estabilidade para o cultivo orgânico. Conclui-se que a análise de adaptabilidade e estabilidade com base na produtividade de biênio é mais segura para a seleção de cultivares. Considerando essa premissa, as cultivares 'Catucaí Vermelho 36/6', 'Catuaí Vermelho IAC 15' e 'Siriema 842' são indicadas somente para os ambientes favoráveis. As cultivares 'Sabiá 708', 'IBC Palma 1', 'Catucaí Amarelo 24/137', 'Oeiras MG 6851' e as linhagens H518 e H514 são indicadas para o cultivo orgânico em locais com ambientes similares aos avaliados em Minas Gerais.

The aim of this research was to compare the stability and adaptability of coffee cultivars in relation to the average annual yield and to the biannual yield by the method of EBERHART & RUSSELL (1996), and select coffee cultivars for organic cultivation in Minas Gerais. The experiments were conducted at three sites in randomized block design with thirty genotypes and three replications. An analysis was based on the annual average yield of four crops (2005/2006, 2006/2007, 2007/2008 and 2008/2009) resulting in twelve environments. The other analysis considered the average of two biannual (2005/2006 and 2006/2007; 2007/2008 and 2008/2009) with a total of six environments. The analysis in which was considered that average biannual yield enabled a significant reduction in the coefficient of environmental variation. Thus, it was possible to identify cultivars with more adaptability and stability to organic cultivation. It was concluded that the analysis of stability and adaptability based on the biannual yield is more precise for selecting cultivars. Considering this premise the cultivars 'Catucaí Vermelho 36/6', 'Catuaí Vermelho IAC 15' and 'Siriema 842' are promising only for favorable environments. The cultivars 'Sabia 708', 'IBC Palma 1', 'Catucaí Amarelo 24/137', 'Oeiras MG 6851' and the lines H518 and H514, stood out in organic farming in similar environments like the locations evaluated in Minas Gerais.

Neste trabalho, objetivou-se avaliar o potencial genético da população de milho UFV 7 para o melhoramento em Minas Gerais. Foram instalados três experimentos com a população de milho UFV 7, em três regiões de Minas Gerais, na safra 2006/2007. Houve interação genótipos x ambientes para todos os caracteres. Foi verificada variabilidade genética para produtividade de grãos, altura de plantas e altura de espigas na população de milho UFV 7, nas três regiões. Na região Sudeste, a população de milho UFV 7 apresentou as maiores estimativas de parâmetros genéticos. A população UFV 7 apresentou alta produtividade de grãos, 9 112kg ha-1, no Sudeste, média produtividade, 6 510kg ha-1, no Oeste, e baixa, 4 572kg ha-1, na região Central. As estimativas de herdabilidade e CVg/CVe, para produtividade, foram superiores a 60% e 1,00, respectivamente. A produtividade de grãos teve correlação genética significativa e positiva com a altura de planta e altura de espiga, na região Oeste e na Central, e com a prolificidade na região Central e região Sudeste. Conclui-se que a população de milho UFV 7 apresenta potencial para extração de linhagens na região Central; potencial para uso imediato na região Sudeste e para novos ciclos de seleção na região Oeste de Minas Gerais, e a seleção para PG aumenta indiretamente a altura de planta e altura de espiga, nas regiões Oeste e Central.

The objective was to assess the genetic potential of maize population UFV 7 for breeding in Minas Gerais, Brazil. Three experiments were installed with the maize population UFV 7 in the three regions of Minas Gerais, in the harvest of 2006/2007. There was genotype x environment interaction for all characters. It was observed genetic variability for grain yield, plant height and ear height in maize population UFV 7, in the three regions. The Southeast region was where the maize population UFV 7 had the highest parameters. The population UFV 7 presented high grain yield, 9 112kg ha-1 in the Southeast, average grain yield, 6 510kg ha-1 in the West and low, 4 572kg ha-1 in the Central Region. Heritability estimate and CVg / CVe for grain yield were higher than 60% and 1.00, respectively. Grain yield had significant and positive genetic correlation with plant height and ear height, in Western and Central, and the prolificacy in Central and Southeast. For maize population UFV 7 it was conclude that it has potential for extraction of lines in the Central Region; it has the potential for immediate use in the Southeast and for new cycles selection in the Western Region of Minas Gerais. The selection for PG provides an indirect increase in plant height and ear height, in the West and Central.