Auxin Effects on Vascular Differentiation in Ostrich Fern

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Abstract
Surgical experiments have confirmed the capacity of a fern shoot apex to give rise to a mature vascular system in the absence of leaves When the shoot apex of Matteuccia struthiopteris Tod was isolated by vertical incisions and incipient leaf pnmordia were suppressed systematically for more than 5 weeks, a mature siphonostele with reduced diameter and uninterrupted by leaf gaps replaced the normal dictyostele If one or two leaf primordia were allowed to develop, a transitional stele with one or two gaps was formed To test the possible role of the leaf primordia as an auxin source, IAA in anion exchange beads was used to replace the suppressed leaf primordia in experimental apices This treatment resulted in the formation of parenchymatous regions simulating leaf gaps with an increase in stelar diameter This response contrasts with the well known promotion of vascular differentiation by auxin in seed plants

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