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Articles

Extracellular Hydrolysis of Starch in Sugarcane Cell Suspensions ^1,2

^a Department of Physiology and Biochemistry, Experiment Station, Hawaiian Sugar Planters' Association, Honolulu, Hawaii 96822

Evidence is presented for the increased excretion of amylolytic enzymes into a sugarcane cell culture medium when starch was substituted for sucrose as an energy source. The excretion was further enhanced by the inclusion of 1 µM gibberellic acid in the nutrient medium. The growth rate of the cells increased after they became adapted to starch relative to cells grown on sucrose, but the rate of amylolytic enzyme excretion remained unaltered. Amylolytic enzymes in the medium included -amylase but the identity of one or more other enzymes related to starch hydrolysis remains in doubt.

² Published with the approval of the Director as Paper No. 272 in the Journal Series of the Experiment Station, Hawaiian Sugar Planters' Association.