Protocols for the micropropagation of pineapple cv. Vitória and cv. IAC Fantástico were optimized, as well as the photosynthetic and growth responses of these genotypes in response to changing the in vitro environment. For the two cultivars, treatments were arranged in a completely randomized design, with six repetitions and five plants per repetition, in a sub plots subdivided, made up of light qualities (white and red), types of culture vessels (closed and ventilated) and sucrose concentrations in the growth medium (15 and 30 g L-1). The evaluation was made after 40 days of in vitro culture. Under the conditions of this study there was no photosynthetic carbon assimilation. This non-assimilation was associated with biochemical compromises rather than photochemical efficiency. The presence of sucrose should be the factor responsible for non-CO2 assimilation. The cv. Vitória showed higher growth than the cv. IAC Fantástico due to the higher carbon absorption via sucrose.
'Vitória'; 'IAC Fantástico'; micropropagation; Ananas comosus; ventilation
