Journal Title
Title of Journal: Australasian Plant Pathol
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Abbravation: Australasian Plant Pathology
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Publisher
Springer Netherlands
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Authors: N P Ranathunge O Mongkolporn R Ford P W J Taylor
Publish Date: 2012/07/09
Volume: 41, Issue: 5, Pages: 463-473
Abstract
The disease cycle of the chili Capsicum annuum anthracnose fungus Colletotrichum truncatum formerly C capsici was elucidated from a study of infection and colonization of seed leaves and fruit Microscopic observations of detached leaves and fruit inoculated with a virulent pathotype F83B revealed direct cuticle penetration and intramural endophytic and necrotrophic phases of colonization Seedling and fruit ripening stages were very susceptible to infection with the pathogen causing pre and postemergence damage and postharvest fruit rot Furthermore a quiescent stage following leaf infection during the vegetative phase of plant growth served as a potential primary inoculum source for fruit infection Leaf epidermal cells of the resistant C chinense PBC932 expressed a strong hypersensitive response 48 h after infection HAI to both highly virulent F83B and less virulent BRIP 26974 pathotypes Infected cells had thickened cell walls cytoplasm aggregation and high levels of reactive oxygen species produced 12 HAI In contrast the infected epidermal cells of the susceptible C annuum cultivar Bangchang showed necrosis and rapid cell death after infection by either pathotype Knowledge of the disease cycle of C truncatum will be helpful in understanding the behaviour of the pathogen in chili fields which will lead to more efficient application of control measures
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