Different Action of Auxin-A and of Heter-Auxin (Preliminary Note)

Publisher Website
Google Scholar
Abstract
If growth hormone is unilaterally applied to twice-decapitated Avena coleoptiles a so-called growth substance curvature occurs. If during the time that the plants curve they are exposed uniformly on all sides to light, the growth substance curvature is less in those plants than in controls that are kept in the dark, provided that auxin-a or auxin-b is used as growth hormone. If hetero-auxin is used instead no difference between the curvatures of exposed and of non-exposed plants could be found. If sections of coleoptiles, mesocotyls, etc., from which their growth hormone has been removed, are put with their basal cut surface on agar blocks containing growth substance, enzymes from the sections inactivate some of the hormone in the blocks. If in the block-helero-auxin was present 18 to 30% of the hormone was destroyed; if auxin-a of the same physiological concentration was present in the blocks, 48-64% of the hormone was destroyed under the same conditions.

This publication has 1 reference indexed in Scilit: