The Role of the Cell Wall as A Signal In Mycorrhizal Associations

Bonfante, Paola

doi:10.1007/978-3-642-73154-9_16

Cited by 57 publications

(27 citation statements)

References 24 publications

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“…Possible mechanisms by which the host controls the fungus are unknown; prior to infection the liverwort cells are apparently identical. In vascular plant endomycorrhizas, the fungus only occurs in unsuberized tissues (Gianitiazzi-Pearson, 1984) and the host wall is thought to have a major role in the control of funga' growth (Bonfante-Fasolo, 1987). A different fungus restriction mechanism must be operative in the thalli of Conocephalum since all the cells here are unsuberized.…”

Section: I S C U S S I O Nmentioning

confidence: 99%

Cytology and development of a mycorrhiza‐like infection in the gametophyte of Conocephalum conicum (L.) Dum. (Marchantiales, Hepatophyta)

Ligrone¹,

Lopes²

1989

New Phytologist

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SUMMARYAn aseptate fungus associated with the gametopbyte of the hepatic Conocephalum conicum (L.) Dum. was studied by light and electron microscopy. The fungus forms a highly branched mycelium external to the plant. Fungal hyphae colonize the smooth-walled rhizoids, through which they pass into the gametophvte parenchyn-ia of the niidrib. The fungus in the parenchyma is entirely intracellular. Vesicles are found in rhizoids and a few ventral layers of parenchyma cells. Prominent arbuscules develop in more internal cells from lateral branches of infecting hyphae that spread from cell to cell. Infected host cells show cytoplasmic proliferation, especially of ribosotnes, plastids and mitochondria. The arbuscules eventually degenerate leaving clumps of collapsed hyphae. Reinfection "f cells with degenerate arbuscules was not observed. The ultrastructural and developmental characteristics of the fungus and its high cytological compatibility with the host are indicative of a well integrated symbiotic association similar to the vesicular-arbuscular mycorrhizas of higher plants.

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Section: I S C U S S I O Nmentioning

confidence: 99%

Cytology and development of a mycorrhiza‐like infection in the gametophyte of Conocephalum conicum (L.) Dum. (Marchantiales, Hepatophyta)

Ligrone¹,

Lopes²

1989

New Phytologist

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“…The ultrastructure of the fungus cell wall changes dramatically after penetrating the plant root, the macromolecular chitin organization changing from fibrillar in the external fungal wall to amorphous in the arbuscular fungal wall. Signals molecules may activate particular genes, products of which lead to new cell components and new enzymatic activities (Bonfante-Fasolo, 1988). All these observations suggest that different proteins may be synthesized to carry out these activities during mycorrhiza formation.…”

Section: Introductionmentioning

confidence: 99%

Comparison of protein patterns in non‐mycorrhizal and vesicular–arbuscular mycorrhizal roots of red clover

1993

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SUMMARYA comparison of the protein content and patterns in root extracts from non-mycorrhizal and vesicular-arbuscular mycorrhizal [Glomus mosseae (Nicol. et Gerd.) Gerd. et Trappe] red clover {Trifolium pratense L.) has been made. Soluble protein content was higher in mycorrhizal than in non-mycorrhizal roots. After separation by DEAEcellulose chromatography and electrophoretic analysis, several additional polypeptides appeared in mycorrhizal extracts. In addition, it seems that one of the additional proteins was a plant-induced superoxide dismutase isozyme.

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“…Attachment has been found in a large number of mutualistic bacterial symbioses, such as Azospirillum-wheat (Eyers et al, 1988;Michiels, Vanderleyden & Van Gool, 1989), Pseudomonas-corn (Vesper, 1987) and Rhizobium-legume (Long, 1989). Specific attachment of fungal spores to their host surface has been demonstrated in mycorrhizal (Duddridge, 1986;Bonfante-Fasolo, 1988), in fungal hyperparasitic (Manocha & Chen, 1990), and in pathogenic associations (Hamer et al, 1988;Boyer & Charest, 1989). In all cases investigated, the role of extracellular matrices and sheaths in the processes of adhesion has been demonstrated or at least postulated (Manocha & Chen, 1991;Michiels, Croes & Vanderleyden, 1991).…”

Section: Introductionmentioning

confidence: 99%

Differential attachment by conidia of the endophyte, Discula umbrinella (Berk. & Br.) Morelet, to host and non‐host surfaces

Toti

Viret

Chapela³

et al. 1992

New Phytologist

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SUMMARYDiflFerential attachment of conidia to leaves of different species (host and non-host) has been observed in the endophytic fungus, Discula umbrinella (Berk. & Br.) Morelet, a deuteromycete known to cause occasional epidemics of anthracnose in beech stands. On beech leaves, attachment gradually increased over 24 h and reached a maximum after 16-24 h; there were small differences in attachment between conidia suspended in water and those in HEPES buffer. The range of variation of results obtained with conidia suspended in HEPES was smaller but the adhesion was clearly enhanced. The adhesion of conidia to the host surface was highest at pH 5, and decreased with increasing pH. Heat and chemical treatments significantly reduced attachment. Two factors (or groups of factors) are likely to be involved in the recognition process. The first is heat-labile, the second one could be a non-protein molecule present on the conidial surface and actively recognized by the host. The physiological similarity between endophytes and other symbionts is briefly discussed.

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The Role of the Cell Wall as A Signal In Mycorrhizal Associations

Cited by 57 publications

References 24 publications

Cytology and development of a mycorrhiza‐like infection in the gametophyte of Conocephalum conicum (L.) Dum. (Marchantiales, Hepatophyta)

Cytology and development of a mycorrhiza‐like infection in the gametophyte of Conocephalum conicum (L.) Dum. (Marchantiales, Hepatophyta)

Comparison of protein patterns in non‐mycorrhizal and vesicular–arbuscular mycorrhizal roots of red clover

Differential attachment by conidia of the endophyte, Discula umbrinella (Berk. & Br.) Morelet, to host and non‐host surfaces

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