RESUMO - INFLUENCE OF DIFFERENT SHADING LEVELS IN PHYSIOLOGICAL BEHAVIOR OF COFFEE CULTIVARS (Coffea arabica L.)ABSTRACT -The objective of this work was to examine the coffee cultivars Acaiá MG 474/19, Catuaí MG 99, Icatu Amarelo MG 3282 and Rubi MG 1192, in relation to parameters such as water potencial, transpiration, leaf surface temperature, stomatic conductance, photosynthesis, internal carbon concentration and PSII photochemical efficiency when submitted to shading levels of 30, 50 and 70% and full sunlight. The evaluations were made in cuttings from these cultivars. The experimental design used was fully randomized with three pots for each treatment. The leaf water potential did not change according to treatments.The photosynthesis, stomatic conductance, transpiration and PSII photochemical efficiency showed significative variations in function of shading levels. INDEX TERMS:Coffee tree, shading, photosynthesis, water relations. INTRODUÇÃOAs cultivares recomendadas para o plantio em escala comercial apresentam elevado potencial econômico, que não tem sido explorado adequadamente pela maior parte dos cafeicultores, e para o estabelecimento e plantio, a escolha adequada é um fator que, sem dúvida, pode afetar mais a produtividade.Apesar do grande número de espécies de café existentes, pouco se sabe sobre o potencial comercial que encerram e seu possível aproveitamento nos planos de melhoramento, sendo os países cafeicultores carentes de estudos comparativos (Fazuoli, 1986).1. Parte da dissertação de mestrado do primeiro autor. 2. Engenheiro Agrônomo, MS em Fisiologia Vegetal,
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