We investigated the regeneration of two Bulgarian sweet pepper cultivars (‘Hebar’ and ‘Stryama’) on solid and
liquid culture medium. Liquid cultures were incubated in temporary immersion RITA® airlift bioreactors. During a period
of 60 days, culture in the liquid medium was associated with significantly increased shoot tip growth, number of lateral
shoots, percentage of rooted plants and micropropagation coefficient, with essentially no callus formation. Regenerants
from cultivar ‘Hebar’ exceeded those of cultivar ‘Stryama’ in all measured traits. A coefficient of micropropagation equal
to 5.3 was observed for the superior cultivar. The results of the present study manifest the possible scale up of the micropropagations
of this recalcitrant species, resulting in higher number of vigorous plants within a short period of time.