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    Virulence diversity of anthracnose pathogens (Colletotrichum acutatum and C. gloeosporioides complexes) on eight olive cultivars commonly grown in Portugal.

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    Authors
    Talhinhas, Pedro
    Gonçalves, Elsa
    Sreenivasaprasad, Surapareddy
    Oliveira, Helena
    Issue Date
    2015-05
    Subjects
    olive anthracnose
    host-pathogen genotype interactions
    Olea europaea ssp. europaea
    Colletotrichum acutatum
    Colletotrichum gloeosporioides
    Portugal
    
    Metadata
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    Abstract
    Olive anthracnose, caused by Colletotrichum acutatum and C. gloeosporioides species complexes, is a major disease affecting fruits at maturity, causing significant yield losses, and poor fruit and oil quality. Diverse genetic groups, particularly belonging to C. acutatum s.l. have been reported among the pathogens, with recent research proposing these genetic groups as distinct species. In this work, the virulence diversity of isolates representing different populations of C. acutatum s.l. and C. gloeosporioides s.s. was studied using a set of eight olive cultivars. Higher disease severity was produced by isolates belonging to groups A2 and A5 of C. acutatum s.l. (=C. nymphaeae and C. acutatum s.s., respectively) compared to C. gloeosporioides s.s. isolates as well as isolates of C. acutatum s.l. group A4 (=C. godetiae). Anthracnose severity was higher on the cultivars ‘Cobrançosa’, ‘Maçanilha de Tavira’ and ‘Galega Vulgar’ and lower in ‘Azeitoneira’, ‘Blanqueta’, ‘Negrinha de Freixo’ and ‘Picual’, but results indicate the occurrence of isolate × cultivar interactions. Differences in severity could be related to differences in conidia germination and appressoria formation, suggesting that early host-pathogen recognition events can in part explain disease severity under favourable environmental conditions. Overall results revealed the higher virulence and fitness levels of genotypes belonging to certain genetic groups within C. acutatum suggesting their ability to adapt to diverse agro-climatic conditions including specific hosts.
    Citation
    Talhinhas, P., Gonclaves, E., Sreenivasaprasad, S., Oliveira, H. (2015) 'Virulence diversity of anthracnose pathogens (Colletotrichum acutatum and C. gloeosporioides complexes) on eight olive cultivars commonly grown in Portugal'. European Journal of Plant Pathology 142 (1) pp73-83.
    Publisher
    Springer Link
    Journal
    European Journal of Plant Pathology
    URI
    http://hdl.handle.net/10547/576991
    DOI
    10.1007/s10658-014-0590-7
    Additional Links
    http://link.springer.com/article/10.1007%2Fs10658-014-0590-7
    Type
    Article
    Language
    en
    ISSN
    0929-1873
    EISSN
    1573-8469
    Sponsors
    Financial support (SFRH/BPD/88994/2012) by FCT (Fundação para a Ciência e a Tecnologia, Portugal). Dr. M. Whitelaw-Weckert is acknowledged for supplying isolate DAR76921.
    ae974a485f413a2113503eed53cd6c53
    10.1007/s10658-014-0590-7
    Scopus Count
    Collections
    Environmental Science

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