“…This effect may have been due to the direct result of higher rates of CO 2 assimilation and stomatal conductance in tissue culture raised plants (Cameron et al, 1985). The superiority of in vitro male sterile Zinnia elegans plants over their seed-derived counterparts has also been demonstrated (Rogers et al, 1992). They also found that in vitro produced plants initiated flowers approximately three weeks earlier, with more plants with smaller head size as compared to seedderived plants.…”