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Coexistent Mediterranean woody species as a driving factor of Phytophthora cinnamomi infectivity and survival

AuthorsGómez, M.C.; González Romero, Mario; Gómez Aparicio, Lorena ; Serrano, María S.
Keywordsolea europaea subsp
Europaea var
Phytophthora interactions
Quercus canariensis
Quercus suber
Soil pathogens
Issue DateMay-2020
PublisherJohn Wiley & Sons
CitationAnnals of Applied Biology (2020) DOI: 10.1111/aab.12599
AbstractThe long-term conservation of Mediterranean mixed oak forests is seriously threatened by the massive mortality of Quercus suber caused by the exotic pathogen Phytophthora cinnamomi. This species frequently grows in mixed forests under natural conditions, but nothing is known about how its level of disease might be altered by the diversity and identity of coexisting neighbours varying in susceptibility to the exotic pathogen. Here we analysed the individual and combined effects of Q. suber and the main coexisting tree species (Quercus canariensis and Olea europaea subsp. europaea var. sylvestris) in mixed forests of southern Spain on the production of infective and survival spores of P. cinnamomi. Through in vitro experiments, it was demonstrated that mixtures of Q. suber and Q. canariensis highly stimulated the production of P. cinnamomi zoospores in comparison with both species in monocultures. Olea europaea did not stimulate zoospore production. Under controlled conditions, the initial and final densities of inoculum in soil planted with monocultures of O. europaea and Q. canariensis did not differ. However, inoculum densities significantly decreased along the experiment in Q. suber mixtures with O. europaea and Q. canariensis. Phytophthora cinnamomi was able to infect and cause root rot symptoms on all tree species, including O. europaea var. sylvestris. We concluded that mixed stands of Q. suber and Q. canariensis are able to stimulate P. cinnamomi infectivity and survival much more than monospecific stands, and consequently under favourable conditions for root disease development, the coexistence of Q. suber and Q. canariensis might exacerbate Mediterranean forests decline. This study also constitutes the first report of O. europaea var. sylvestris as host and inductor of P. cinnamomi sporulation under controlled conditions.
Description10 páginas.- 3 figuras.- referencias
Publisher version (URL)http://dx.doi.org/10.1111/aab.12599
Appears in Collections:(IRNAS) Artículos
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