Pathogenic variation of Alternaria species associated with leaf blotch and fruit spot of apple in Australia

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• 作者：Dalphy O. C. Harteveld (1)
  Olufemi A. Akinsanmi (1)
  André Drenth (1)
  
• 关键词：Apple ; Alternaria ; Leaf blotch ; Fruit spot ; Pathogenicity ; Aggressiveness
• 刊名：European Journal of Plant Pathology
• 出版年：2014
• 出版时间：August 2014
• 年：2014
• 卷：139
• 期：4
• 页码：789-799
• 全文大小：599 KB
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• 作者单位：Dalphy O. C. Harteveld (1)
  Olufemi A. Akinsanmi (1)
  André Drenth (1)
  
  1. Centre for Plant Science, Queensland Alliance for Agriculture and Food Innovation, University of Queensland, Ecosciences Precinct, GPO 267, Brisbane, QLD, 4001, Australia
  
• ISSN：1573-8469

文摘

Four Alternaria species groups (A. longipes, A. arborescens, A. alternata/A. tenuissima and A. tenuissima/A. mali) are associated with leaf blotch and fruit spot of apple in Australia. There is no information on the variability of pathogenicity among the species and isolates within each species causing leaf blotch or fruit spot. We used a detached leaf assay and an in planta fruit inoculation assay to determine the pathogenicity and virulence of the four Alternaria species. Our results showed that isolates within the same species were not specific to either leaf or fruit tissue and showed great variability in pathogenicity and virulence, indicating cross-pathogenicity, which may be isolate dependent rather than species dependent. Generally, virulence of A. tenuissima and A. alternata isolates on leaf and fruit was higher than other species. Isolates of all species groups were pathogenic on leaves of different cultivars, but pathogenicity on fruit of different cultivars varied among isolates and species. Implications of our findings on prevalence of the diseases in different apple-producing regions in Australia and the development of targeted disease management of the diseases are discussed.