Abstract
Summary Starch-accumulating calluses originated from the internode tissue of etiolated potato shoot (Solanum tuberosum L. cv. Irish Cobbler) contained near the level of swelling tips of isolated stolons cultured in vitro. Both phosphorylase and soluble starch synthetase activities were higher than those of starch-non accumulating callus cultures which showed no or a little activities of either one or both. On the other hand, endogenous levels of auxin, cytokinin and gibberellin were investigated in starch-accumulating and non accumulating calluses and their original plant tissues. In starch-accumulating calluses, higher auxin activities were detected. Levels of substances inhibiting growth of the dwarf rice plant used for gibberellin assay were lower in starch-accumulating calluses and their mother strain than in the others. The conditions for starch deposition in potato callus cultures are discussed on refering to the previous results with intact and cultured stolons.
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