Archiv für Mikrobiologie

, Volume 79, Issue 4, pp 293–310 | Cite as

Structure and differentiation of the cell wall of Phytophthora palmivora: Cysts, hyphae and sporangia

  • J. Tokunaga
  • S. Bartnicki-Garcia


Walls from cysts, hyphae and sporangia of Phytophthora palmivora consist chiefly (ca. 90% dry wt) of β-glucans with 1,3-, 1,4- and 1,6-links. The glucans are predominatly β-1,3-linked but there are significant differences in the relative proportion of 1,3-, 1,6- and 1,4-linked glucosyl residues among the three wall types. There are also differences in protein content, susceptibility to degradation by various β-glucanases, and surface texture. The isolated cyst wall consists solely of a thin fabric of long, tightly interwoven, randomly oriented microfibrils. Both inner and outer surfaces of the cyst wall are distinctly microfibrillar. The hyphal wall has two different textures; the internal surface is distinctly microfibrillar while the external surface is non-fibrillar. In a germinated cyst, there is a zone of demarcation where the microfibrils of the cyst wall disappear into the smooth outer texture of the germ tube wall. An exo-β-1,3-glucanase preferentially removed the amorphous material of the outer surface of the germ tube leaving exposed a continuous microfibrillar fabric from cyst to hyphal tube. Conceivably, the textural and structural differentiation of the cell wall may play a decisive role in cellular morphogenesis.


Outer Surface Glucan Surface Texture Tube Wall Amorphous Material 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • J. Tokunaga
    • 1
  • S. Bartnicki-Garcia
    • 1
  1. 1.Department of Plant PathologyUniversity of CaliforniaRiversideUSA

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