RESUMEN En los últimos años el cultivo de café guatemalteco ha sufrido declinación en su rendimiento como resultado de la roya del café. El uso de cultivares resistentes a esta enfermedad y con potencial para producir cafés con buena calidad de bebida es fundamental para la sustentabilidad del cultivo en el país. El objetivo de este estudio fue analizar el potencial de calidad del grano y el perfil sensorial de genotipos de café Arábica resistentes a la roya, en función de diferentes tiempos de fermentación biológica. El experimento se implementó en julio de 2014, en la finca El Panorama, ubicada en el municipio de San Rafael Pie de La Cuesta, Departamento de San Marcos, Guatemala. Se probaron ocho progenies F5 resistentes a la roya y se utilizaron como controles los cultivares Marsellesa y Bourbon Amarelo. Cada genotipo fue sometido a dos tiempos de fermentación biológica en agua, después del pelado (24 y 72 h). El diseño experimental fue bloques completos al azar con tres repeticiones en un esquema factorial 10 (genotipos) × 2 (tiempos), totalizando 60 unidades experimentales. Se evaluó la calidad, perfil sensorial y granulometría de los tratamientos. Todos los genotipos estudiados resistentes a la roya mostraron potencial para la producción de cafés especiales en Guatemala y una granulometría superior en relación al Bourbon Amarelo. Marsellesa y Bourbon Amarelo obtuvieron puntajes finales más altos y los atributos de sabor, regusto, acidez, cuerpo, equilibrio y en general, fueron más acentuados. El tiempo de fermentación biológica no influyó en la puntuación final del café (pontuación total en el protocolo SCA); sin embargo, hubo un cambio en el perfil sensorial, con énfasis en el cultivar Marsellesa, que aumentó la frecuencia de notas frutales y redujo las notas de caramelo con mayor tiempo de fermentación.

SUMMARY In recent years, the Guatemalan coffee plantations have suffered a decline in its yield as a result of coffee rust. The use of cultivars resistant to this disease and with the potential to produce coffee with good drinking quality is essential for the sustainability of coffee cultivation in the country. The aim of this study was to analyze bean quality potential and the sensory profile of rust-resistant Arabica coffee genotypes as a function of different times of biological fermentation. The experiment was carried out in July 2014, at El Panorama farm, located in the municipality of San Rafael Pie de La Cuesta, Department of San Marcos, Guatemala. Eight rust resistant F5 progenies were tested and cultivars Marsellesa and Bourbon Amarelo were used as controls. Each genotype was subjected to two times of biological fermentation in water, after peeling (24 and 72 h). The experimental design was randomized complete blocks with three replications, in a 10 (genotypes) × 2 (times) factorial scheme, totaling 60 experimental units. The quality, sensory profile and granulometry of the treatments were evaluated. All the rust-resistant genotypes studied showed potential to produce specialty coffees in Guatemala and a superior granulometry in relation to Bourbon Amarelo. Marsellesa and Bourbon Amarelo obtained higher final scores and the attributes flavor, aftertaste, acidity, body, balance and overall were more accentuated. The time of biological fermentation did not influence the final score of the coffee (total score in the SCA protocol); however, there was a change in the sensory profile, with emphasis on cultivar Marsellesa, which increased the frequency of fruity notes and reduced caramel notes with longer fermentation time.

Resumo O objetivo deste trabalho foi selecionar genótipos de Coffea arabica com boa produtividade e potencial de tolerância ao deficit hídrico, além de tentar compreender os mecanismos fisiológicos e anatômicos envolvidos na adaptabilidade desses genótipos ao estresse hídrico. Avaliaramse características fisiológicas, anatômicas e agronômicas de 19 genótipos de C. arabica sob as duas seguintes condições hídricas: irrigação regular e sem irrigação (deficit hídrico no solo). Os genótipos 'IPR 100', 2, 5 e 7 apresentaram características agronômicas, fisiológicas e anatômicas que contribuíram para melhor manutenção do estado hídrico no desenvolvimento inicial do cafeeiro. Com base nesses resultados, esses genótipos são potencialmente tolerantes ao deficit hídrico. Os genótipos 4, 10, 11, 14, 15 e 'Bourbon Amarelo IAC J10' apresentam menor adaptabilidade das estruturas anatômicas em condições de deficit hídrico no solo. Os genótipos de cafeeiro apresentam plasticidade foliar, como a espessura do parênquima paliçádico e esponjoso, e o número, posição, dimensões e mobilidade dos estômatos em condições de deficiência hídrica.

Abstract The objective of this work was to select genotypes of Coffea arabica with good yield and potential tolerance to water deficit, as well as to try to understand the physiological and anatomical mechanisms involved in the adaptability of these genotypes to water stress. The physiological, anatomical, and agronomic traits of 19 genotypes of C. arabica were evaluated under the two following water conditions: regular irrigation and no irrigation (soil water deficit). The 'IPR 100', 2, 5, and 7 genotypes showed agronomic, physiological, and anatomical traits that contributed to a better water status maintenance in the initial development of coffee plants. Based on these results, these genotypes are potentially tolerant to water deficit. The 4, 10, 11, 14, 15, and 'Bourbon Amarelo IAC J10' genotypes show a lower adaptability of the anatomical structures under soil-water deficit conditions. The coffee tree genotypes display leaf plasticity, such as the thickness of palisade and spongy parenchyma, and the number, position, dimensions, and mobility of stomata under water deficit conditions.

Resumo: O objetivo deste trabalho foi avaliar a produtividade e a qualidade sensorial da bebida do café arábica sob a influência de espécies arbóreas cultivadas em diferentes espaçamentos. O ensaio foi instalado em 2012, no município do Santo Antônio do Amparo, no estado de Minas Gerais, Brasil. Um delineamento de blocos ao acaso foi realizado, com quatro repetições e sete tratamentos, conforme a seguir: Coffea arabica Catuaí Vermelho IAC 99 em monocultivo (3,40x0,65 m); e essa cultivar consorciada em dois espaçamentos (9,0x13,6 e 18,0x13,6 m), na linha dos cafeeiros, com mogno-africano (Khaya ivorensis), teca (Tectona grandis), ou cedro-rosa (Acrocarpus fraxinifolius). Nas entrelinhas, foram fixadas três linhas de café, tendo totalizado 13,6 m entre as fileiras arborizadas. A produtividade, a análise sensorial (prova de xícara) e a análise de conteúdo dos atributos sensoriais foram avaliadas nas safras de 2017 e 2018. Os tratamentos e os anos de colheita influenciaram na produtividade. A análise sensorial foi positiva para o consórcio com o mogno-africano e a teca, em 2018. Os atributos sensoriais e as nuances são modificados pelos anos de colheita. Os cafeeiros arábica consorciados com mogno-africano apresentam produtividade superior, independentemente do espaçamento entre as espécies, bem como qualidade sensorial superior na colheita de 2018.

Abstract: The objective of this work was to evaluate the productivity and beverage sensory quality of arabica coffee under the influence of tree species cultivated at different spacings. The experiment was set in 2012, in the municipality of Santo Antônio do Amparo, in the state of Minas Gerais, Brazil. A randomized complete block design was carried out with four replicates and seven treatments, as follows: Catuaí Vermelho IAC 99 Coffea arabica in monoculture (3.40x0.65 m); and this cultivar intercropped at two spacings (9.0x13.6 and 18.0x13.6 m) in the coffee row ‒ either with African mahogany (Khaya ivorensis), teak (Tectona grandis), or pink cedar (Acrocarpus fraxinifolius). Three coffee rows were fixed between rows, totaling 13.6 m between the wooded rows. Productivity, sensory analysis (cup test), and content analysis of sensory attributes were evaluated in the 2017 and 2018 crop years. The treatments and years of harvest influenced productivity. The sensory analysis was positive for coffee intercropped with African mahogany and teak, in 2018. Sensory attributes and nuances are modified by the years of harvest. Arabica coffee plants intercropped with African mahogany show a superior productivity, regardless of the spacing between species, as well as a higher sensory quality in the 2018 harvest.