Protoplasts isolated from cell cultures ofLithospermum erythrorhizondivided repeatedly and formed callus colonies. Factors that affect protoplast division are the use of glucose as osmoticum, a new plating method with twin layers of agar-liquid medium, and the culture of protoplasts under the osmolarity lower than that in the isolation solution. When the sucrose in the protoplast-culture medium was replaced with glucose, and coconut milk was added to the medium, the frequency of colony formation markedly increased. The culture period required for colony formation also was shortened.
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