Genome characteristics of facultatively symbiotic Frankia sp strains reflect host range and host plant biogeography

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Philippe Normand (Author) Other; Pascal Lapierre (Author) Other; Louis S Tisa (Author) Other; Johann Peter Gogarten (Author) Other; Nicole Alloisio (Author) Other; Emilie Bagnarol (Author) Other; Carla A Bassi (Author) Other; Alison M Berry (Author) Other; Derek M Bickhart (Author) Other; Nathalie Choisne (Author) Other; Arnaud Couloux (Author) Other; Benoit Cournoyer (Author) Other; Stephane Cruveiller (Author) Other; Vincent Daubin (Author) Other; Nadia Demange (Author) Other; Maria Pilar Francino (Author) Other; Eugene Goltsman (Author) Other; Ying Huang (Author) Other; Olga R Kopp (Author) Other; Laurent Labarre (Author) Other; Alla Lapidus (Author) Other; Celine Lavire (Author) Other; Joelle Marechal (Author) Other; Michele Martinez (Author) Other; Juliana E Mastronunzio (Author) Other; Beth C Mullin (Author) Other; James Niemann (Author) Other; Pierre Pujic (Author) Other; Tania Rawnsley (Author) Other; Zoe Rouy (Author) Other; Chantal Schenowitz (Author) Other; Anita Sellstedt (Author) Other; Fernando Tavares (Author) FCUP; Jeffrey P Tomkins (Author) Other; David Vallenet (Author) Other; Claudio Valverde (Author) Other; Luis G Wall (Author) Other; Ying Wang (Author) Other; Claudine Medigue (Author) Other; David R Benson (Author) Other

Journal

Title: Genome Research

Vol. 17

Pages: 7-15

ISSN: 1088-9051

Publisher: Cold Spring Harbor Laboratory Press

Indexing

ISI Web of Knowledge - 277 Citations

Scopus - 291 Citations

Scientific classification

FOS: Natural sciences > Biological sciences

Other information

Authenticus ID: P-004-D91

DOI: 10.1101/gr.5798407

Abstract (EN): Soil bacteria that also form mutualistic symbioses in plants encounter two major levels of selection. One occurs during adaptation to and survival in soil, and the other occurs in concert with host plant speciation and adaptation. Actinobacteria from the genus Frankia are facultative symbionts that form N-2-fixing root nodules on diverse and globally distributed angiosperms in the "actinorhizal" symbioses. Three closely related clades of Frankia sp. strains are recognized; members of each clade infect a subset of plants from among eight angiosperm families. We sequenced the genomes from three strains; their sizes varied from 5.43 Mbp for a narrow host range strain (Frankia sp. strain HFPCcl3) to 7.50 Mbp for a medium host range strain (Frankia alni strain ACNl4a) to 9.04 Mbp for a broad host range strain (Frankia sp. strain EANlpec.) This size divergence is the largest yet reported for such closely related soil bacteria (97.8% - 98.9% identity of 16S rRNA genes). The extent of gene deletion, duplication, and acquisition is in concert with the biogeographic history of the symbioses and host plant speciation. Host plant isolation favored genome contraction, whereas host plant diversification favored genome expansion. The results support the idea that major genome expansions as well as reductions can occur in facultative symbiotic soil bacteria as they respond to new environments in the context of their symbioses.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9