Martins, L.D., Rodrigues, W.P., Martins, M.Q., Tomaz, M.A., Campostrini, E., Partelli, F.L., Semedo, J.N., Fortunato, A.S., Colwell, F., Pais, I.P., Scotti-Campos, P., Rodrigues, A.P., Leitão, A.E., Maia, R., Máguas, C., Ribeiro-Barros, A.I., Ghini, R., Lidon, F.C., DaMatta, F.M. & Ramalho, J.C. (2015) Prolonged exposure to elevated [CO2] promotes the growth of Coffea arabica L. and Coffea canephora Pierre ex Froehner plants. Proceedings do IX Simpósio de Pesquisa dos Cafés do Brasil.
The aim of this study was to evaluate the impact of long-term increased atmospheric [CO2] on the vegetative growth of plants of C. arabica L. and C. canephora Pierre ex Froehner for about one year.. It was used a completely randomized split-plot design, in which the plot consisted of levels of [CO2] atmospheric (380 and 700 μL CO2 L -1 ) and the subplot the coffee two genotypes (C. arabica cv. IPR 108 and C. canephora cv. Conilon Clone 153), with five replicates; to standardize all values have been described in percentage. The results showed that the plants of both genotypes showed similar vegetative growth under 380 or 700 μL CO2 L -1 up to 90 days. Thereafter a higher vegetative vigor was observed in plants grown exposed to 700 μL CO2 L -1 , as reflected in increases in leaf area and number, as well as in the number of plagiotropic branches (but not in plant height). These results can be explained, at least partly, because of the source-sink relationship has been maintained in this condition, based in the evidence that there was a higher carbohydrate production (source) and also higher growth of vegetative parts (sink), indicating that the [CO2] enhancement has functioned as a “C-fertilization”.