Abstract
Experiments were conducted to study the susceptibility to infection by two fungal pathogens, Cryphonectria parasitica or Phomopsis spp. of undisturbed holm oaks (Quercus ilex) and the resprout from the stump of trees after excision of the shoot. Leaf gas-exchange and chlorophyll a fluorescence were recorded on plants growing in natural conditions for two years, as markers of dis- ease progress at the first stages of infection. In infected plants, pathogen-induced stomatal closure limited photosynthesis an d increased contribution of energy dissipating processes protecting PSII integrity, as shown by higher non-photochemical quenchin g (NPQ). Excision treatment reduced susceptibility to infection and favoured water availability in resprouts, which showed higher gas- exchange rates. Quercus ilex / Cryphonectria parasitica /Phomopsis spp. / gas-exchange / chlorophyll fluorescence
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