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Title: A Transcriptional Regulator of the LuxR-UhpA Family, FlcA, Controls Flocculation and Wheat Root Surface Colonization by 'Azospirillum brasilense' Sp7
Contributor(s): Pereg, Lily  (author); Paquelin, Annick (author); Gounon, Pierre (author); Kennedy, Ivan R (author); Elmerich, Claudine (author)
Publication Date: 1998
DOI: 10.1094/MPMI.1998.11.3.177
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Abstract: Genetic complementation of a spontaneous mutant, impaired in flocculation, Congo red binding, and colonization of root surface, led to the identification of a new regulatory gene in 'Azospirillum brasilense' Sp7, designated 'flcA'. The deduced amino acid sequence of 'flcA' shared high similarity with a family of transcriptional activators of the LuxR-UhpA family. The most significant match was with the AgmR protein, an activator for glycerol metabolism in 'Pseudomonas aeruginosa'. Derivatives of Sp7 resulting from site-directed Tn5 mutagenesis in the 'flcA' coding sequence were constructed by marker exchange. Characterization of the resulting mutant strains showed that 'flcA' controls the production of capsular polysaccharides, the flocculation process in culture, and the colonization of the root surface of wheat. This study provides new information on the genetic control of the mechanism of plant root colonization by 'Azospirillum'.
Publication Type: Journal Article
Source of Publication: Molecular Plant-Microbe Interactions, 11(3), p. 177-187
Publisher: American Phytopathological Society
Place of Publication: United States of America
ISSN: 1943-7706
Field of Research (FOR): 060503 Microbial Genetics
060111 Signal Transduction
060504 Microbial Ecology
Socio-Economic Objective (SEO): 829899 Environmentally Sustainable Plant Production not elsewhere classified
970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
970106 Expanding Knowledge in the Biological Sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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