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Annals of Botany 70: 277-282, 1992
© 1992 Annals of Botany Company

RESEARCH-ARTICLE

Auxin Effects on Vascular Differentiation in Ostrich Fern

YILUN MA and TAYLOR A. STEEVES

Department of Biology, University of Saskatchewan Saskatoon, Saskatchewan, Canada S7N 0W0

Accepted: 8 April 1992   

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

Auxin, vascular differentiation, stele, shoot apex, Matteuccia struthiopteris


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