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Archives of Microbiology

, Volume 103, Issue 1, pp 259–270 | Cite as

The regreening of nitrogen-deficient Chlorella fusca

II. Structural changes during synchronous regreening
  • N. A. Pyliotis
  • D. J. Goodchild
  • L. H. Grimme
Short Communications

Abstract

Chlorella fusca, strain 211-15, cells degreened in a nitrogen-deficient mineral growth medium in the light for 4–6 weeks were regreened for up to 24 hrs in a nitrogen rich medium that leads to synchronous cell division at 24–26 hrs. Structural changes in the plastid membranes during the regreening period were observed by thin section and freeze-fracture electron microscopy. Nitrogen-deficient plastids were found to have non-appressed lamellae, prolamellar body-like membrane aggregations, and only 2 types of freeze-fracture face. At this time no photosynthetic oxygen evolution could be demonstrated. After 6 hrs regreening the plastid lamellae had fused to form bands of appressed lamellae and the four types of freeze-fracture face, described previously, were visible. At this time photosynthetic oxygen evolution could be demonstrated. After 24 hrs regreening the plastids had an appearance typical of normally grown Chlorella and had commenced to divide. Supporting evidence for these developmental stages is presented from isolated chloroplast particle fractions.

An unusual type of cell wall proliferation was observed in the nitrogen-deficient Chlorella cells that resulted in the laying down of several walls, each with a trilaminar component.

Key words

Chlorella N-Deficiency Structure Synchronous-Regreening Chloroplast Structure Freeze-Fracture Cell Wall Prolamellar Body 

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Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • N. A. Pyliotis
    • 1
  • D. J. Goodchild
    • 1
  • L. H. Grimme
    • 2
  1. 1.Division of Plant IndustryCSIROCanberra
  2. 2.Botanisches Institut der Universität Erlangen-NürnbergErlangen

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