Abstract
1. Indoleacetic or β-naphthoxyacetic acid in lanolin brought about depletion of starch in tomato cuttings kept 6 days in darkness in a mineral nutrient containing sucrose. Similar cuttings, not treated, still had an abundance of starch after 6 days in darkness. 2. Cuttings in media containing maltose, levulose, dextrose, or lactose in place of sucrose responded in the same way to β-naphthoxyacetic or indoleacetic acid. Nitrogen-deficient plants also showed a depletion of starch when treated with the growth substances. 3. Starch was deposited in the root caps of primordia which resulted from treatment with the growth substance. 4. Digestion of starch was inhibited in thin sections by aqueous solutions of 0.02 or 0.002 per cent indoleacetic acid, while depletion of starch occurred rapidly in the controls. Lower concentrations of indoleacetic acid were ineffective. On the other hand, 0.02 per cent indoleacetic acid in aqueous solution accelerated the hydrolysis of starch in intact stems.
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