Infection and colonization of bean leaf by Phaeoisariopsis griseola

Infection and spread of Phaeoisariopsis griseola in the leaf of bean (Phaseolus vulgaris) were investigated by scanning and transmission electron microscopy. Conidia of P. griseola germinated by releasing a germ tube either at one end of the conidia or both ends. The germ‐tube growth followed the co...

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Bibliographic Details
Published in:Plant pathology 2001-02, Vol.50 (1), p.103-110
Main Authors: Monda, E. O., Sanders, F. E., Hick, A.
Format: Article
Language:English
Subjects:
angular leaf spot
Biological and medical sciences
electron microscopy
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Pathology, epidemiology, host-fungus relationships. Damages, economic importance
Phaseolus vulgaris
Phytopathology. Animal pests. Plant and forest protection
spore germination
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Summary:Infection and spread of Phaeoisariopsis griseola in the leaf of bean (Phaseolus vulgaris) were investigated by scanning and transmission electron microscopy. Conidia of P. griseola germinated by releasing a germ tube either at one end of the conidia or both ends. The germ‐tube growth followed the contours of epidermal cells. The fungus entered the leaf through the stomata and grew mainly intercellularly between mesophyll and palisade cells. The chloroplast envelope and plasma membrane of adjacent cells disintegrated, lost structural integrity and dried out. Hyphae did not penetrate host cells. A stroma subsequently formed on the leaf surface. Conidiophores elongated under favourable conditions forming synnemata with conidia at the tips of conidiophores. Conidiophores also emerged through stomata.
ISSN:0032-0862
1365-3059
DOI:10.1046/j.1365-3059.2001.00537.x