Amino acid changes during sunflower infection by the necrotrophic fungus B. cinerea
2009
Dulermo, Thierry | Bligny, Richard | Gout, Elisabeth | Cotton, Pascale | Laboratoire de Génomique Fonctionnelle des Champignons Pathogènes des Plantes (UMR Microbiologie) ; Université de Lyon | Laboratoire de physiologie cellulaire végétale (LPCV) ; Université Joseph Fourier - Grenoble 1 (UJF)-Institut National de la Recherche Agronomique (INRA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG) ; Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Addendum to: Dulermo T, Rascle C, Chinnici G, Gout E, Bligny R, Cotton P. Dynamic carbon transfer during pathogenesis of sunflower by the necrotrophic Fungus Botrytis cinerea: from plant hexoses to mannitol. New Phytol (2009) 183(4): 1149-1162
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Afficher plus [+] Moins [-]anglais. Metabolic changes that occur in host tissues during a necrotrophic plant/fungal interaction have been poorly investigated. Whereas carbon metabolism reprogramming and photosynthesis disturbances have been studied,1 data on plant amino acids stores during infection are scarce. Here we report an analysis of sunflower cotyledon amino acid content during infection with the necrotrophic fungus Botrytis cinerea, by using 13C-NMR spectroscopy. A rapid disappearance of plant amino acids was observed, most probably due to fungal assimilation. In order to explore amino acid changes due to host reaction, we investigated the amino acid content in healthy and invaded region of infected leaves. During the course of infection, glutamate and total amino acid stores were affected at distance in the non invaded region. Glutamate depletion was correlated to an enhanced sunflower glutamate dehydrogenase (GDH) transcription level in the area invaded by pathogen. Our data suggest that glutamate could be transferred to the invaded region to supply nitrogen. Such a strategy could delay cell death, and consequently disturb fungal progression in plant tissues.
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