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Postpollination Phenomena in Orchid Flowers. X. Transport and Fate of Auxin

The major portion of indoleacetic acid (IAA-2-14C), applied to stigmas of whole flowers of Angraecum cv Veitchii and Cattleya cv Porcia `Cannizaro,' as well as to excised gynostemia of the latter, is immobilized at the point of application. A limited amount of nonpolar transport occurs. Some of the auxin is conjugated into IAA-aspartate in a process which is inhibited by cycloheximide, suggesting a requirement for de novo protein synthesis. Because the effects of pollination and auxin application spread quickly to floral segments, we suggest that additional substances, from pollen or produced by pollinated flowers, may participate in the regulation of postpollination phenomena in orchid flowers.