Penicillium species associated with preharvest wet core rot in south africa and their pathogenicity on apple

Simple item page
dc.contributor.authorVan Der Walt L.
dc.contributor.authorSpotts R.A.
dc.contributor.authorVisagie C.M.
dc.contributor.authorJacobs K.
dc.contributor.authorSmit F.J.
dc.contributor.authorMcLeod A.
dc.date.accessioned2011-05-15T16:02:14Z
dc.date.available2011-05-15T16:02:14Z
dc.date.issued2010
dc.description.abstractSymptoms associated with the core region of apple fruits (Malus domestica) can be classified as moldy core (MC), wet core rot (WCR), and dry core rot (DCR). Infections leading to WCR are thought to occur primarily postharvest, although in South Africa preharvest symptoms also have been reported. The first aim of this study was to investigate the causative agent(s) of preharvest WCR by isolating fungi from eight internal positions in asymptomatic, MC, WCR, and DCR fruits. Secondly, the pathogenicity and virulence of all Penicillium isolates were investigated using three apple fruit inoculation methods: surface wounding, deep wounding, and nonwounding. Isolation of fungi from WCR fruits showed that Penicillium was the predominant fungal genus from most isolation positions including the lesion area. Penicillium ramulosum was the predominant species isolated from all fruits. However, in WCR fruits, the incidence (58%) of P. ramulosum was much higher than in MC (6%), DCR (7%), or asymptomatic (7%) fruits. Less frequently isolated Penicillium species included P. expansum and a few other species. Pathogenicity testing using the nonwounding method was best at discriminating highly virulent isolates. P. expansum was the most virulent species, followed by a putative new Penicillium species with closest sequence similarity to P. dendriticum. P. ramulosum isolates, although showing varying degrees of virulence, all had low virulence, causing only small lesions in wounded apple fruits. © 2010 The American Phytopathological Society.
dc.description.versionArticle
dc.identifier.citationPlant Disease
dc.identifier.citation94
dc.identifier.citation6
dc.identifier.issn1912917
dc.identifier.other10.1094/PDIS-94-6-0666
dc.identifier.urihttp://hdl.handle.net/10019.1/12374
dc.subjectApple fruits
dc.subjectCausative agents
dc.subjectCore region
dc.subjectFungal genera
dc.subjectMalus domestica
dc.subjectPostharvest
dc.subjectSequence similarity
dc.subjectSmall lesions
dc.subjectSouth Africa
dc.subjectFungi
dc.subjectFruits
dc.subjectFungi
dc.subjectMalus x domestica
dc.subjectPenicillium
dc.subjectPenicillium dendriticum
dc.subjectPenicillium expansum
dc.titlePenicillium species associated with preharvest wet core rot in south africa and their pathogenicity on apple
dc.typeArticle
Files
Collections
Stellenbosch University - Scopus Publications