Infection of Stylosanthes guianensis and S. scabra by Colletotrichum gloeosporioides

Penetration and postpenetration development were investigated quantitatively and qualitatively by light and scanning electron microscopy. Penetration commenced by 24 hr after inoculation on most interactions and continued until at least 96 hr on some. The overall level of penetration was very low (9...

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Bibliographic Details
Published in:Phytopathology 1990-09, Vol.80 (9), p.837-842
Main Authors: Ogle, H.J. (University of Queensland, St. Lucia, QLD, Australia), Gowanlock, D.H, Irwin, J.A.G
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
ECOLOGIA
ECOLOGIE
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
GENOTIPOS
GENOTYPE
GLOMERELLA CINGULATA
INDICE DE CRECIMIENTO
INFECCION
INFECTION
MICELIO
MYCELIUM
Pathology, epidemiology, host-fungus relationships. Damages, economic importance
PATHOTYPE
PATOTIPOS
Phytopathology. Animal pests. Plant and forest protection
RELACIONES HUESPED PARASITO
RELATION HOTE PARASITE
STYLOSANTHES
STYLOSANTHES GUIANENSIS
TAUX DE CROISSANCE
VARIEDADES
VARIETE
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Summary:Penetration and postpenetration development were investigated quantitatively and qualitatively by light and scanning electron microscopy. Penetration commenced by 24 hr after inoculation on most interactions and continued until at least 96 hr on some. The overall level of penetration was very low (9%). After penetration, a vesicle formed within the epidermal cell beneath the appressorium. In compatible interactions, this cell plus two to four adjacent cells were usually filled with hyphae before the fungus spread intra- and intercellularly into the mesophyll. "Runner" hyphae emerged from the epidermal cells to grow subcuticularly or, more often, superficially, initiating new infections without the formation of appressoria. In incompatible interactions, colonies ceased growth, increased in size very slowly or apparently decreased in size. Most infections were restricted to one cell. No "runner" hyphae were observed. Host cell response to infection varied from the deposition of apposition layers on the inner surface of the epidermal cell wall or the aggregation of granular cytoplasm beneath an appressorium to browning of the cell wall and contents
ISSN:0031-949X
1943-7684
DOI:10.1094/Phyto-80-837