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Fungal development and plant response in detached onion allium cepa onion bulb scales and leaves inoculated with botrytis allii botrytis cinerea botrytis fabae and botrytis squamosa



Fungal development and plant response in detached onion allium cepa onion bulb scales and leaves inoculated with botrytis allii botrytis cinerea botrytis fabae and botrytis squamosa



Plant Pathology (Oxford) 33(3): 401-410



Fungal development and plant responses were examined in detached leaves and mid-bulb scales of A. cepa. Following inoculation with suspensions of 105 conidia/ml distilled water B. squamosa consistently produced spreading lesions in leaves and bulb scales. B. allii produced spreading lesions at most sites in bulbs but was very inconsistent in its infection of leaves; lesions were often confined to inoculation sites. Limited lesions were usually produced by B. cinerea but B. fabae failed to produce symptoms at most sites. Extensive colonization by B. allii and B. squamosa required rapid penetration and totally necrotrophic fungal growth. During development of a spreading lesion, plant cell walls became very swollen around intramural hyphae and wall swelling appeared to precede epidermal cell death. Resistance to colonization was due to poor germination, failure to produce distinct infection hyphae (associated with accumulation of deposits of granular reaction material [RM] in underlying live cells) or restriction of infection hyphae among small groups of dead cells (limited lesion formation). Only B. fabae germinated poorly, and germ-tubes produced often failed to attempt penetration but grew over the leaf or bulb scale surface. Reducing numbers of conidia increased the frequency of sites associated with RM accumulation; granular deposits being particularly common at sites inoculated with low numbers of B. allii conidia. EM reveled that RM granules were osmiophilic aggregates formed between the plasma membrane and epidermal cell wall. In the absence of RM, growth of avirulent species was restricted with the swollen walls of dead epidermal cells. Results are compared with those from studies on tulip and broad bean leaves.

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Accession: 005494798

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