El chancro de ramas de olivo: resistencia varietal e impactos ecofisiológicos
2023
Drissi El Bouzaidi, Ahlam
This thesis focuses on branch canker and leprosy diseases in olive trees, caused by different fungi: Botryosphaeriaceae species (Neofusicoccum mediterraneum and Neof. parvum) and Phlyctema vagabunda, respectively. The study evaluates the resistance of 10 Spanish olive cultivars to these pathogens and their ecophysiological impact. Fungal growth was tested under different temperatures (0°C to 40°C) and water potentials (-0.62 MPa to -14.93 MPa). Neof. mediterraneum and Neof. parvum showed maximum growth at 25°C, while P. vagabunda did not grow above 30°C. Adding olive branch powder stimulated Neofusicoccum growth but not P. vagabunda. Field inoculation showed that ‘Gordal sevillana’ was the most susceptible cultivar. Both Neofusicoccum species reduced vegetative growth, stomatal conductance, and leaf water potential but did not affect leaf fluorescence. No correlation was found between canker severity and plant traits. This study is the first to assess the resistance of olive cultivars to branch canker under field conditions.
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