Rott Philippe, Reddy S.L., Marlow Gary C., Royer Monique, Gabriel Dean W.. 2008. A diffusible signal factor modulates albicidin biosynthesis by Xanthomonas albilineans. Phytopathology, 98 (6S), suppl. 136, Résumé, 1 p. 2008 APS Centennial Meeting, Minneapolis, États-Unis, 26 Juillet 2008/30 Juillet 2008.
Liste HCERES des revues (en SHS) : oui
Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie
Résumé : Xanthomonas albilineans produces albicidin, a unique and specific toxin that causes foliar symptoms of sugarcane leaf scald disease. In the related species Xanthomonas campestris pv. campestris, a cluster of genes called rpf (for regulation of pathogenicity factors) is involved in control of various cellular processes. Marker exchange mutants of the rpfF gene in strain XaFL07-1 of X. albilineans from Florida were generated, and the mutants were verified by PCR analysis and by use of an X. campestris diffusible signal factor (DSF) reporter strain. Both albicidin and protease production by these mutants appeared significantly reduced compared to XaFL07-1, suggesting that DSF is involved in regulation of albicidin biosynthesis by X. albilineans. However, sugarcane cultivar CP80-1743, moderately susceptible to leaf scald, exhibited pencil line symptoms indicative of albicidin production on emerging leaves after inoculation of stalks by the decapitation method. Preliminary experiments indicated that at least some rpfF mutants colonized sugarcane stalks less efficiently, both spatially and in intensity, than wild type X. albilineans. Additional inoculation experiments are in progress to assess disease severity caused by rpfF mutants, and to study the role of DSF production in sugarcane stalk colonization by X. albilineans.
Mots-clés Agrovoc : Xanthomonas albilineans, Saccharum officinarum, toxine bactérienne, génétique
Mots-clés complémentaires : Albicidine
Classification Agris : H20 - Maladies des plantes
Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique
Auteurs et affiliations
-
Rott Philippe, CIRAD-BIOS-UMR BGPI (USA)
ORCID: 0000-0001-6085-6159
- Reddy S.L., University of Florida (USA)
- Marlow Gary C., University of Florida (USA)
- Royer Monique, CIRAD-BIOS-UMR BGPI (FRA)
- Gabriel Dean W., University of Florida (USA)
Autres liens de la publication
- Document en bibliothèque
- Localisation du document : CD_BR16001 [(Bibliothèque de Lavalette)]
Source : Cirad - Agritrop (https://agritrop.cirad.fr/548187/)
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