Process for in vitro micropropagation of plant material of a species of eucalyptus comprising the steps of multiplication and elongation of shoots developed from plant seedlings by the temporary immersion method, comprising: (a) In the step of multiplication of the shoots, the material to be propagated is spread on a suitable support in a first container (vegetative propagation container) and is subjected to management of temporary immersion in a liquid nutrient medium from a second container (storage container of liquid medium), which is supplemented inside the plant containers with air injection and carbon dioxide enrichment and photosynthetically active radiation by way of light-emitting diode lamps, said management comprising alternated periods of immersion and rest, wherein said carbon dioxide enrichment is in the concentration of 800-1000 micromole CO 2 per mole of air and said photosynthetically active radiation is in the intensity of 20-30 umol/m 2 /s; (b) In the step of shoots elongation, the propagation material is subjected to management of temporary immersion, preferably employing the same nutrient medium and the same conditions of operation in the bioreactor, according to step (a), wherein said photosynthetically active radiation is in the intensity of 40-60 μmol/m 2 /s, said management comprising of alternated periods of immersion and rest, wherein said method in said step (b) (elongation), said immersion periods are significantly shorter and said rest periods are longer compared with the periods of immersion and rest, respectively, in step (a) (of multiplication); wherein said immersion period in step (a) is a maximum of 3 minutes and said rest period is at most 4 hours; wherein said immersion period in step (b) is a maximum of 60 seconds and said rest period is at most 6 hours. (a) In the step of multiplication of the shoots, the material to be propagated is spread on a suitable support in a first container (vegetative propagation container) and is subjected to management of temporary immersion in a liquid nutrient medium from a second container (storage container of liquid medium), which is supplemented inside the plant containers with air injection and carbon dioxide enrichment and photosynthetically active radiation by way of light-emitting diode lamps, said management comprising alternated periods of immersion and rest, wherein said carbon dioxide enrichment is in the concentration of 800-1000 micromole CO 2 per mole of air and said photosynthetically active radiation is in the intensity of 20-30 umol/m 2 /s; (b) In the step of shoots elongation, the propagation material is subjected to management of temporary immersion, preferably employing the same nutrient medium and the same conditions of operation in the bioreactor, according to step (a), wherein said photosynthetically active radiation is in the intensity of 40-60 μmol/m 2 /s, said management comprising of alternated periods of immersion and rest, wherein said method in said step (b) (elongation), said immersion periods are significantly shorter and said rest periods are longer compared with the periods of immersion and rest, respectively, in step (a) (of multiplication); wherein said immersion period in step (a) is a maximum of 3 minutes and said rest period is at most 4 hours; wherein said immersion period in step (b) is a maximum of 60 seconds and said rest period is at most 6 hours.