Plant Systematics and Evolution

, Volume 151, Issue 1–2, pp 1–18 | Cite as

Ultrastructure of the early stages of carposporophyte development in the red algaChondria tenuissima (Rhodomelaceae, Ceramiales)

  • I. Tsekos
  • E. Schnepf


The ultrastructure of the early stages of carposporophyte development in the marine red algaChondria tenuissima has been studied. The diploid carposporophyte grows on the gametophyte. Apical gonimoblast cells develop into diploid carpospores. The basal gonimoblast cells cease to divide and undergo considerable cytoplasmic changes before they become incorporated into the expanding fusion cell. Nucleus and plastids degenerate gradually, while mitochondria remain intact. The smooth endoplasmic reticulum becomes prominent, it seems to produce small vesicles with electron dense contents. Simultaneously, numerous mucilage sacs are formed, presumably from dilating ER cisternae. The contents of the mucilage sacs are secreted by exocytosis. The pit connections between gonimoblast cells flare out. They remain as isolated bodies without connection to a wall after fusion. Secondary pit connections occur between vegetative gametophyte cells and sterile carposporophyte cells. There are three different morphological types of pit connections.

Key Words

Algae Rhodophyceae Ceramiales Rhodomelaceae Chondria. — Carposporophyte development fusion cell gonimoblast cells pit connections 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Alley, C. D., Scott, J. L., 1977: Unusual dictyosome morphology and vesicle formation in tetrasporangia of the marine red algaPolysiphonia denudata. — J. Ultrastruct. Res.58, 289–298.CrossRefPubMedGoogle Scholar
  2. Broadwater, S. T., Scott, J., 1982: Ultrastructure of early development in the female reproductive system ofPolysiphonia harveyi Bailey (Ceramiales, Rhodophyta). — J. Phycol.18, 427–441.CrossRefGoogle Scholar
  3. Chamberlain, A. H. L., Evans, L. V., 1973: Aspects of spore production in the red algaCeramium. — Protoplasma76, 139–159.CrossRefGoogle Scholar
  4. Fritsch, F. E., 1945: The Structure and Reproduction of the Algae2. — Cambridge: Cambridge University Press.Google Scholar
  5. Hommersand, M. H., 1963: The morphology and classification of someCeramiaceae andRhodomelaceae. — Univ. Calif. Publ. Bot.35, 165–366.Google Scholar
  6. Kugrens, P., West, J. A., 1972: Ultrastructure of tetrasporogenesis in the parasitic red algaLevringiella gardneri (Setchell)Kylin. — J. Phycol.8, 370–383.CrossRefGoogle Scholar
  7. Kylin, H., 1928: Entwicklungsgeschichtliche Florideenstudien. — Lunds Univ. Årsskrift. N.F., Avd. 2,84 (4).Google Scholar
  8. Parsons, M., 1975: Morphology and Taxonomy of theDasyaceae and theLophothalieae (Rhodomelaceae) of theRhodophyta. — Aust. J. Bot.23, 549–713.CrossRefGoogle Scholar
  9. Phillips, R. W., 1985–1896: On the development of the cystocarps inRhodomelaceae. — Ann. Bot.9–10.Google Scholar
  10. Pueschel, C. M., 1977: A freeze-etch study of the ultrastructure of red algal pit plugs. — Protoplasma91, 15–30.CrossRefGoogle Scholar
  11. —— 1979: Ultrastructure of tetrasporogenesis inPalmaria palmata (Rhodophyta). — J. Phycol.15, 409–424.CrossRefGoogle Scholar
  12. Reynolds, E. S., 1963: The use of lead citrate at high pH as an electron-opaque stain in electron microscopy. — J. Cell Biol.17, 208–213.CrossRefPubMedGoogle Scholar
  13. Scott, J. L., Dixon, P. S., 1973: Ultrastructure of tetrasporogenesis in the marine red algaPtilota hypnoides. — J. Phycol.9, 29–46.CrossRefGoogle Scholar
  14. Tsekos, I., 1981: Growth and differentiation of the Golgi apparatus and wall formation during carposporogenesis in the red algaGigartina teedii (Roth)Lamour. — J. Cell Sci.52, 71–84.PubMedGoogle Scholar
  15. —— 1983: The ultrastructure of carposporogenesis inGigartina teedii (Roth)Lamour. (Gigartinales, Rhodophyceae): Gonimoblast cells and carpospores. — Flora174, 191–211.Google Scholar
  16. Tsekos, I., Schnepf, E., 1983: The ultrastructure of carposporogenesis inGigartina teedii (Roth)Lamour. (Gigartinales, Rhodophyceae): Auxiliary cell, cystocarpic plant. — Flora173, 81–96.Google Scholar
  17. Wetherbee, R., 1980: Postfertilization development in the red algaPolysiphonia. I. Proliferation of the carposporophyte. — J. Ultrastruct. Res.70, 259–274.CrossRefPubMedGoogle Scholar
  18. Yamanouchi, S., 1906: The life history ofPolysiphonia violacea. — Bot. Gaz.42, 401–449.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • I. Tsekos
    • 1
  • E. Schnepf
    • 2
  1. 1.Botanical InstituteUniversity of ThessalonikiThessalonikiGreece
  2. 2.Zellenlehre, University of HeidelbergHeidelbergFederal Republic of Germany

Personalised recommendations