title: Associations among rhizobial chromosomal background, nod genes, and host plants based on the analysis of symbiosis of indigenous rhizobia and wild legumes native to Xinjiang.
abstract: The associations among rhizobia chromosomal background, nodulation genes, legume plants, and geographical regions are very attractive but still unclear. To address this question, we analyzed the interactions among rhizobia rDNA genotypes, nodC genotypes, legume genera, as well as geographical regions in the present study. Complex relationships were observed among them, which may be the genuine nature of their associations. The statistical analyses indicate that legume plant is the key factor shaping both rhizobia genetic and symbiotic diversity. In the most cases of our results, the nodC lineages are clearly associated with rhizobial genomic species, demonstrating that nodulation genes have co-evolved with chromosomal background, though the lateral transfer of nodulation genes occurred in some cases in a minority. Our results also support the hypothesis that the endemic rhizobial populations to a certain geographical area prefer to have a wide spectrum of hosts, which might be an important event for the success of both legumes and rhizobia in an isolated region.
authors.affiliation: State Key Laboratory of Agrobiotechnology, Key laboratory of Agro-Microbial Resource and Application, Ministry of Agriculture, College of Biological Sciences, China Agricultural University, Beijing 100094, China.
authors.forename: Tian Xu
authors.initials: TX
authors.lastname: Han
authors.forename: Chang Fu
authors.initials: CF
authors.lastname: Tian
authors.forename: En Tao
authors.initials: ET
authors.lastname: Wang
authors.forename: Wen Xin
authors.initials: WX
authors.lastname: Chen
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics*; D044822:Biodiversity; D002681:China; D002876:Chromosomes, Bacterial; D004269:DNA, Bacterial / Q000235:genetics; D017753:Ecosystem; D007887:Fabaceae / Q000382:microbiology*; D005798:Genes, Bacterial; D005843:Geography; D017351:N-Acetylglucosaminyltransferases / Q000235:genetics*; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012231:Rhizobium / Q000145:classification / Q000235:genetics*; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D013559:Symbiosis
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S; D017351:N-Acetylglucosaminyltransferases; C060771:NodC protein, Rhizobiales