The Dependence of Auxin-induced Growth on Auxin-independent Metabolic Changes in Slices of Storage Tissue

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Abstract
Potato and Jerusalem artichoke slices were incubated in auxin (NAA) from the time of cutting, together with lithium ion or chloral, either of which suppresses the respiratory changes which normally follow slicing. Auxin-induced growth was thereby prevented. Lithium ion or chloral were found also to inhibit enlargement independently of their effect on respiratory development when administered after the completion of the respiratory rise. When chloral was added with auxin in the first 24 hours and the slices then removed to auxin alone, an additional incubation period, equivalent in duration to the time required for the development of the induced respiration, was necessary before significant auxin induced growth occurred. When disks in auxin were treated with chloral for 24 hours after the completion of the respiratory rise, growth resumed with no observable delay when the tissue was transferred to auxin. On the basis of the foregoing observations and related experiments it was concluded that auxin-mediated growth depends upon the induced respiration.
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