Pre-inoculation ozone exposure predisposes oak leaves to attacks by Diplodia corticola and Biscogniauxia mediterranea. (Contributo in atti di convegno)

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  • Pre-inoculation ozone exposure predisposes oak leaves to attacks by Diplodia corticola and Biscogniauxia mediterranea. (Contributo in atti di convegno) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Paoletti E., Anselmi N., Franceschini A. (2006)
    Pre-inoculation ozone exposure predisposes oak leaves to attacks by Diplodia corticola and Biscogniauxia mediterranea.
    in Impacts of Air Pollution and Climate Change on Forest Ecosystems, Riverside, California
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Paoletti E., Anselmi N., Franceschini A. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • IUFRO Research Group 7.01. Forests under Influence of Air Pollution, Climate Change and Urban Development. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • One-year-old cork oak (Quercus suber) and Turkey oak (Quercus cerris) seedlings were exposed to ozone (110 ppb, 5 h d-1, for 30 days) and were inoculated with Diplodia corticola and Biscogniauxia mediterranea, respectively, by spraying a suspension of spores on the leaves. Both fungi are endophytic and may act as weakness parasites, contributing to oak decline. Ozone exposure stimulated leaf attacks after inoculation, despite both oak species were ozone-tolerant. In fact, steady-state gas exchange, leaf waxes and wettability were not significantly affected by ozone. In Q. cerris, O3 altered the structure of stomata, as observed by scanning microscopy, and reduced the leaf relative water content. No hyphal entry through stomata or growth attraction towards stomata was, however, observed. As inoculations were performed in a humid chamber, stomata were likely to be closed. When Q. cerris was inoculated in natural conditions, i.e. in a forest infected by B. mediterranea, O3-exposed seedlings showed a higher number of B. mediterranea isolates than the controls, suggesting that pre-inoculation O3 exposure predisposed Q. cerris leaves to attacks by B. mediterranea independently on stomata. In fact, the hyphae of both fungi were able to enter the leaf directly through the abaxial blade cuticle. Two ways of penetration were observed: gradual embedding into the epicuticular waxes, and production of a hollow in the cuticle at the penetration point. The main cause of the increased leaf injury in O3-exposed seedlings appeared to be the higher germination rate of spores than in control leaves. Increased attacks after O3 exposure may contribute to the oak declines caused by these weakness parasites in Mediterranean ecosystems. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • -Istituto per la Protezione delle Piante, Firenze -Dipartimento Protezione Piante, Università degli Studi della Tuscia, Viterbo -Dipartimento Protezione Piante, Università degli Studi di Sassari (literal)
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  • Pre-inoculation ozone exposure predisposes oak leaves to attacks by Diplodia corticola and Biscogniauxia mediterranea. (literal)
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