1. Resistance of olive tree to Spilocaea oleagina is mediated by the synthesis of phenolic compounds
- Author
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Aabidine, A. Z. E., Baissac, Y., Abdelmajid Moukhli, Jay-Allemand, C., Khadari, B., Modafar, C. E., Université Cadi Ayyad [Marrakech] (UCA), Université Montpellier 2 - Sciences et Techniques (UM2), Institut national de la recherche agronomique [Maroc] (INRA Maroc), Développement et amélioration des plantes (UMR DAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Recherche Agronomique (INRA)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)
- Subjects
résistance aux maladies ,OLIVE TREE ,SPILOCAEA OLEAGINA ,RESISTANCE ,MULTIFACTORIAL PHENOLICS ,MOROCCO ,OLIVIER ,OLEA EUROPEA ,TAVELURE DE L'OLIVIER ,MALADIE EN OEIL DE PAON ,afrique ,composé phénolique ,food and beverages ,pays méditerranéen ,croisement ,enzyme ,maroc ,[SDV.IDA]Life Sciences [q-bio]/Food engineering ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,génotype - Abstract
E-mail Addresses: elmodafar@fstg-marrakech.ac.ma Publication Inra prise en compte dans l'analyse bibliométrique des publications scientifiques mondiales sur les Fruits, les Légumes et la Pomme de terre. Période 2000-2012. http://prodinra.inra.fr/record/256699; International audience; To understand the resistance of the olive tree to the leaf-spot disease caused by Spilocaea oleagina, the constitutive and postinfectional synthesis phenolic compounds of the leaves were analyzed by HPLC in 110 genotypes F1 (susceptible cultivar “Picholine marocaine” x resistant cultivar “Picholine du Languedoc”) presenting of the differential behaviours to this disease (highly resistant, resistant, intermediate, susceptible & highly susceptible genotypes). The HPLC analysis distinguished 15 majors phenolic compounds according to their chromatographic and spectral characteristics into five phenolic families (hydroxycinnamic derivatives, flavonoids, verbascoside derivatives, tyrosol derivatives, oleuropein derivatives). No qualitative difference was observed between cultivars. Principal components analysis (PCA) highlighted three multifactorial components distinguishing the various genotypes according to their behaviour to the disease. These components were determined by the postinfectional contents of oleuropein and rutin and by the constitutive contents of tyrosol and its derivatives. The tyrosol and its derivatives were associated with constitutive resistance, whereas the oleuropein and rutin were associated with induced resistance. These results suggest that the activity ratio of the enzymes implied in various biosynthesis ways of these phenolic compounds and/or the expression rate of the corresponding genes would be at the origin of the resistance degree of olive tree to S. oleagina.