Open AccessGenomic and phenotypic characterization of a nonpigmented variant of Pantoea vagans biocontrol strain C9‐1 lacking the 530‐kb megaplasmid pPag3
Author(s) -
Smits Theo H.M.,
Rezzonico Fabio,
Pelludat Cosima,
Goesmann Alexander,
Frey Jürg E.,
Duffy Brion
Publication year - 2010
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2010.01994.x
Subject(s) - biology , plasmid , pantoea , auxotrophy , genetics , phenotype , gene , quorum sensing , microbiology and biotechnology , genome , amp resistance , virulence , escherichia coli , 16s ribosomal rna
A 530‐kb megaplasmid pPag3 contributing 10.8% of the total genome of Pantoea vagans biocontrol strain C9‐1 was sequenced. A rare nonpigmented variant C9‐1W was obtained and shown to have lost pPag3, but retained all other plasmids (pPag1, pPag2). Phenotypic characterization of the variant confirmed the function of several annotated genes that may influence ecological fitness and efficacy. Metabolic profiling revealed important plasmid‐based carbon utilization phenotypes. Plasmid loss resulted in thiamine auxotrophy, absence of carotenoid pigmentation, desferrioxamine diffusible siderophore biosynthesis, inherent ampicillin resistance and expression of AI‐1 quorum‐sensing signaling. This confirmed the functional expression of the corresponding genes located on pPag3 in P. vagans .