Summary
At the apex of the protonema ofDryopteris varia, a club-shaped papilla is differentiated after the protonema was segmented into six or seven cells in the normal development. If the sporeling is reared in medium containing IAA, formation of the apical papilla is much accelerated to take place at two- or three-cell stage when the concentration of IAA is 1 to 0.01 ppm. But if it is reared in a medium of a higher concentration of IAA, 10 to 100 ppm, the same apex differentiates a rhizoid. That is to say, it depends upon quantitative relations of auxin as to whether the apex of protonema forms a papilla or a rhizoid.
Similar content being viewed by others
Literature
Kato, Y., 1957: Experimental studies on rhizoid-differentiation of certain ferns. Phyton (Argentina)9, 25–40.
Leopold, A. C., and K. V. Thimann, 1949: The effect of auxin on flower initiation. Amer. J. Bot.36, 342–348.
Olson, R. A., and A. G. DuBuy, 1937: The role of growth substances in the polarity and morphogenesis inFucus. Amer. J. Bot.24, 611–615.
Warmke, H. E., and L. Warmke, 1950: The role of auxin in the differentiation of root and shoot-primordia from root cuttings ofTaraxacum andCichorium. Amer. J. Bot.37, 272–280.
Whitaker, D. M., 1940: Physical factors of growth. Growth, Suppl. 75–90.
Author information
Authors and Affiliations
Additional information
With 3 Figures
Rights and permissions
About this article
Cite this article
Nakazawa, S. Morphogenesis of the fern protonema. Protoplasma 52, 1–4 (1959). https://doi.org/10.1007/BF02665680
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02665680