Abstract
The influence of the exogenous polyamines: putrescine, spermidine and spermine, on the frequency of protoplast divisions for 2 genotypes of sugar beet (Beta vulgaris L.) was analyzed. Protoplasts were cultured by the agarose disk method on Saunders and Doley medium supplemented with either hormones or polyamines, or hormones combined with polyamines. The latter supplement led to a statistically significant increase in plating efficiency. The improvement in division index was caused mainly by spermine.
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