Plant Systematics and Evolution

, Volume 176, Issue 1–2, pp 35–51 | Cite as

Acid phosphatase activity during spore differentiation of the red algaeGigartina teedii andChondria tenuissima

  • I. Tsekos
  • E. Schnepf
Article

Abstract

The acid phosphatase activity during carposporogenesis inGigartina and tetrasporogenesis inChondria was studied using the Gomori technique. During the first steps of gonimoblast maturation ofGigartina, portions of cytoplasm are ensheathed by ER cisternae with acid phosphatase activity, giving rise to autolysosomal concentric membrane bodies. In a similar way large mucilage sacs are severed. They extrude their contents in a kind of exocytosis. Multivesicular bodies, concentrically arranged cisternae and extracytoplasmic compartments, each with acid phosphatase activity, remain in young carpospores for some time, probably as remnants of the autophagocytotic and exocytotic events. The Golgi apparatus is poorly developed in gonimoblast cells and young carpospores. It becomes a prominent cell component in maturing carpospores and then participates in cell wall formation. Only some of the dictyosomal cisternae contain acid phosphatase; these are irregularly distributed in the dictyosome. — In pre- and postmeiotic tetraspore mother cells ofChondria massive lead deposits are found in the dictyosomes and in adjacent Golgi vesicles. Finer lead precipitates occur in ER cisternae, especially in those which are sequestering starch-grain-containing portions of the cytoplasm to give rise to autolysosomes. During cell cleavage, the dictyosomes aggregate. They become devoid of acid phosphatase activity with the exception of vesicles at the trans face. Later, Golgi stacks associate and have common, Gomori positively reacting, narrow cisternae at the cis face. The Golgi apparatus derived “cored vesicles” do not contain lead precipitates whereas the Golgi cisternae in the final stage of tetrasporogenesis show acid phosphatase activity. Variations in acid phosphatase distribution are explained in the light of current models of membrane flow.

Key words

Algae Rhodophyta Gigartina teedii Chondria tenuissima Acid phosphatase localization autolysomes gonimoblast and carpospore development tetrasporogenesis spore ultrastructure Golgi apparatus 

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • I. Tsekos
    • 1
  • E. Schnepf
    • 2
  1. 1.Institute of BotanyUniversity of ThessalonikiThessalonikiGreece
  2. 2.Lehrstuhl für Zellenlehre, Fakultät für BiologieUniversität HeidelbergHeidelbergGermany

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