title: Genomic comparison of the endophyte Herbaspirillum seropedicae SmR1 and the phytopathogen Herbaspirillum rubrisubalbicans M1 by suppressive subtractive hybridization and partial genome sequencing.
abstract: Herbaspirillum rubrisubalbicans M1 causes the mottled stripe disease in sugarcane cv. B-4362. Inoculation of this cultivar with Herbaspirillum seropedicae SmR1 does not produce disease symptoms. A comparison of the genomic sequences of these closely related species may permit a better understanding of contrasting phenotype such as endophytic association and pathogenic life style. To achieve this goal, we constructed suppressive subtractive hybridization (SSH) libraries to identify DNA fragments present in one species and absent in the other. In a parallel approach, partial genomic sequence from H. rubrisubalbicans M1 was directly compared in silico with the H. seropedicae SmR1 genome. The genomic differences between the two organisms revealed by SSH suggested that lipopolysaccharide and adhesins are potential molecular factors involved in the different phenotypic behavior. The cluster wss probably involved in cellulose biosynthesis was found in H. rubrisubalbicans M1. Expression of this gene cluster was increased in H. rubrisubalbicans M1 cells attached to the surface of maize root, and knockout of wssD gene led to decrease in maize root surface attachment and endophytic colonization. The production of cellulose could be responsible for the maize attachment pattern of H. rubrisubalbicans M1 that is capable of outcompeting H. seropedicae SmR1.
authors.affiliation: Department of Biochemistry and Molecular Biology, Universidade Federal do Paraná, Curitiba, PR, Brazil. roseadele@ufpr.br
authors.forename: Rose A
authors.initials: RA
authors.lastname: Monteiro
authors.forename: Eduardo
authors.initials: E
authors.lastname: Balsanelli
authors.forename: Thalita
authors.initials: T
authors.lastname: Tuleski
authors.forename: Helison
authors.initials: H
authors.lastname: Faoro
authors.forename: Leonardo M
authors.initials: LM
authors.lastname: Cruz
authors.forename: Roseli
authors.initials: R
authors.lastname: Wassem
authors.forename: Valter A
authors.initials: VA
authors.lastname: de Baura
authors.forename: Michelle Z
authors.initials: MZ
authors.lastname: Tadra-Sfeir
authors.forename: Vinícius
authors.initials: V
authors.lastname: Weiss
authors.forename: Wanderson D
authors.initials: WD
authors.lastname: DaRocha
authors.forename: Marcelo
authors.initials: M
authors.lastname: Muller-Santos
authors.forename: Leda S
authors.initials: LS
authors.lastname: Chubatsu
authors.forename: Luciano F
authors.initials: LF
authors.lastname: Huergo
authors.forename: Fábio O
authors.initials: FO
authors.lastname: Pedrosa
authors.forename: Emanuel M
authors.initials: EM
authors.lastname: de Souza
mesh_terms: D001483:Base Sequence; D023281:Genomics; D042803:Herbaspirillum / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D006824:Hybridization, Genetic; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization / Q000379:methods; D018517:Plant Roots / Q000382:microbiology; D017422:Sequence Analysis, DNA; D003313:Zea mays / Q000382:microbiology