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.
coffee tree; shading; photosynthesis; water relations
