Impact of Erysiphe alphitoides on transpiration and photosynthesis in Quercus robur leaves - INRA - Institut national de la recherche agronomique Accéder directement au contenu
Article Dans Une Revue European Journal of Plant Pathology Année : 2009

Impact of Erysiphe alphitoides on transpiration and photosynthesis in Quercus robur leaves

Résumé

Oak powdery mildew, (Erysiphe alphitoides) causes one of the most common diseases of oaks. We assessed the impact of this pathogen on photosynthesis and water relations of infected leaves using greenhouse grown oak seedlings. Transpiration of seedling infected by oak powdery mildew was also investigated. Altogether, E. alphitoides had a low impact on host gas exchange whether at leaf or whole plant scale. Maximal stomatal conductance of infected leaves was reduced by 20-30% as compared to healthy controls. Severely infected seedlings did not experience any detectable change of whole plant transpiration. The reduction in net CO 2 assimilation, A n , was less than proportional to the fraction infected leaf area. Powdery mildew reduced both the maximal light driven electron flux (J max) and the apparent maximal carboxylation velocity (Vc max) although Vc max was slightly more impacted than J max. No compensation of the infection occurred in healthy leaves of partly infected seedlings as the reduced photosynthesis in the infected leaves was not paralleled by increased A n levels in the healthy leaves of the seedlings. However, E. alphitoides had a strong impact on leaf lifespan of infected leaves. It is concluded that the moderate effect of E. alphitoides on oak might be related to the small impact on net CO 2 assimilation rates and on tree transpiration; nevertheless, the severe reduction in leaf lifespan of heavily infected leaves may lead to decreased carbon uptake over the growth season.
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Dates et versions

hal-02103659 , version 1 (18-04-2019)

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Mostafa Hajji, Erwin E. Dreyer, Benoit Marçais. Impact of Erysiphe alphitoides on transpiration and photosynthesis in Quercus robur leaves. European Journal of Plant Pathology, 2009, 125 (1), pp.63-72. ⟨10.1007/s10658-009-9458-7⟩. ⟨hal-02103659⟩
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