SummaryThe acid invertase content of t.issue slices from immature internodes of sugar· cane decreases rapidly when glucose is supplied in the bat.hing medium, maximum effectiveness occurring at about O· 03r-I.The extracted enzyme is unst;able in solution at pH values below 5·0, but glucose (0' hI) does not affect stability. The pH of juice was not altered by incubation of tissues in glucose for 8 hr. Treatments which induced fl. sixfold change in invertase content gave no significant changes in protein nitrogen content of the tissue.The effectiveness of a large number of sugars and related compounds in changing the acid invertase content of the tissue has been examined. An interpretation is given in terms of the hypothesis that occupation of a controller site by D.glucose 01' suitable structural analogues regulates synthesis of t,he enzyme.
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