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Infection, colonisation and sporulation by Pseudocercospora macadamiae on macadamia fruit

Miles, A.K. and Akinsanmi, O.A. and Sutherland, P.W. and Aitken, E.A.B. and Drenth, A. (2009) Infection, colonisation and sporulation by Pseudocercospora macadamiae on macadamia fruit. Australasian Plant Pathology, 38 (1). pp. 36-43.

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Article Link(s): http://dx.doi.org/10.1071/AP08074

Publisher URL: http://www.publish.csiro.au

Abstract

The structures and manner with which Pseudocercospora macadamiae penetrates, colonises and proliferates from the pericarp of macadamia fruit was studied using scanning electron microscopy and fluorescence light microscopy. Germ tubes arising from conidia penetrated open stomata within 20 h of inoculation, without observation of specialised infection structures such as appressoria. Colonisation of the pericarp was intercellular, without observation of specialised intracellular infection structures such as haustoria, and was complete from the epidermis to the mesocarp. The fungus proliferated at the epidermis by the formation of conidiophores and conidia on substomatal and protuberant subepidermal stromata. These structures were not observed on the mesocarp surface. The onset of visual husk spot symptoms coincided with an increase in pathogen biomass on the pericarp surface. The progression of symptoms from tan-coloured spots to larger red-brown lesions coincided with the production of conidiophores from substomatal and protuberant subepidermal stromata. The darker the colour of the husk spot lesion, the more frequently protuberant subepidermal stromata were observed. These findings are discussed in the context of observation of other cercosporoid fungi.

Item Type:Article
Corporate Creators:Horticulture and Forestry Science
Additional Information:© Australasian Plant Pathology Society. © CSIRO Publishing.
Keywords:Histology; Hyphomycete; Proteaceae; citrus greasy spot; leaf spot; Colletotrichum gloeosporioides; husk spot; leaves; disease; penetration; mulberry; growth; fungus.
Subjects:Science > Botany > Cryptogams
Plant culture > Fruit and fruit culture > Nuts
Plant pests and diseases > Individual or types of plants or trees
Plant pests and diseases > Plant pathology
Deposited On:10 Feb 2009 06:34
Last Modified:10 Jun 2011 01:29

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