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The major portion of indolcacetic acid (Ii\A-2-,.C), applied to stigmas of whole flowers of An•rau11111 cv Veitc~ii and Cot~leya_ cv Por.ci'! 'Cannizaro,' as well as to excised gynostemia of the latter, i~ imm~bilized !lt the point of apphcat1on. A lm11ted amount of nonpolar transport occurs. Some of the auxin 1s conjugated into IAA-aspartate in a process which is inhibited by cycloheximide, suggesting a requirement for de riovo 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.

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