Abstract
Friable calli were obtained fromAchillea millefolium L. hypocotyls, in Gamborg B5 medium, supplemented with 1.5mg.1−1 2,4-D / 0.1mg.1−1 Kin, and used for the production of cell suspension cultures in the same liquid medium. The growth pattern of the cultures was determined in permanent light or dark conditions and with different inoculum densities, basal media, growth regulators and sucrose concentrations. Different sources and nitrogen amounts were assayed to study the effect on yarrow cell growth. The conditions found to be optimal for growth of yarrow cell suspension cultures were: 70g (f.w.).1−1 of initial inoculum in Gamborg B5 medium, supplemented with 1.5mg. 1−1 2,4-D / 0.1mg.1−1 Kin, NO3−/NH4+ (30/lmM), and 2% sucrose, in darkness. In these culture conditions the cell suspensions showed a doubling time of 35–40h.
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