Detection of polysaccharides and ultrastructural modification of the photobiont cell wall produced by two arginase isolectins from Xanthoria parietina

Morphological and structural studies carried out in Xanthoria parietina reveal some fungal mechanisms to regulate both growth and development of the phycobiont as well as the number of photobiont cells present in the holobiont. This regulation is performed by phenolic acids and glycosylenzymes. An u...

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Bibliographic Details
Published in:Journal of Plant Research 1998-06, Vol.111 (1102), p.191-197
Main Authors: del Carmen Molina, M. (Universidad Complutense, Madrid (Spain)), Bajon, C, Sauvanet, A, Robert, D, Vicente, C
Format: Article
Language:English
Subjects:
ARGINASA
ARGINASE
CELL WALLS
LICHEN
LICHENES
LIQUENES
PARED CELULAR
PAROI CELLULAIRE
POLISACARIDOS
POLYHOLOSIDE
POLYSACCHARIDES
ULTRAESTRUCTURA
ULTRASTRUCTURE
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Summary:Morphological and structural studies carried out in Xanthoria parietina reveal some fungal mechanisms to regulate both growth and development of the phycobiont as well as the number of photobiont cells present in the holobiont. This regulation is performed by phenolic acids and glycosylenzymes. An ultrastructural analysis using the polysaccharide detection technique PATAg shows that plasmolysis of cells occur when freshly isolated phycobiont are incubated with two arginase lectins (ABP, algal binding protein and SA, secreted arginase), with development of large cytoplasmic vesicles filled with amorphous polysaccharides that are exocyted to the periplasmic space. Finally, membranes of organelles and plasma membrane are altered and the cell wall is broken. The results presented here provide evidence of a possible fungus-to-algal action as deduced from the hemiparasitic symbiosis theory
ISSN:0918-9440
1618-0860
DOI:10.1007/bf02512169