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1 Key Laboratory of Agro-Microbial Resource and Application, Ministry of Agriculture/College of Biological Sciences, China Agricultural University, Beijing 100094, China
2 College of Life Science, Henan Agricultural University, Zhengzhou 450002, China
3 Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, 11340 México D. F., Mexico
4 Department of Bioengineering and Biotechnology, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
5 College of Resources and Environmental Science, Sichuan Agricultural University, Yaan 625000, China
Correspondence
Wen Xin Chen
wenxin_chen{at}263.net
A novel Mesorhizobium group associated with Albizia kalkora [Wang et al. (2006), Syst Appl Microbiol 29, 502–517] was further characterized. The seven strains in this group showed similar protein patterns and were different from defined Mesorhizobium species in SDS-PAGE of whole-cell proteins. The representative strain CCBAU 61158T formed a novel Mesorhizobium lineage in phylogenetic analyses of 16S rRNA, atpD, glnII and nifH genes. However, its nodC gene sequence was more similar to that of Rhizobium gallicum R602spT than to those of Mesorhizobium species. DNA–DNA relatedness between CCBAU 61158T and reference strains of defined Mesorhizobium species was lower than 34.1 %. These results indicated that this Mesorhizobium group was a unique genomic species. The subtropical distribution, host origin, PCR-RFLP patterns of 16S rRNA genes, fatty acid profile and a series of phenotypic characteristics could be used as distinctive features of this group. This group is therefore proposed as a novel species, Mesorhizobium albiziae sp. nov., with CCBAU 61158T (=LMG 23507T=USDA 4964T) as the type strain. Strain CCBAU 61158T could form effective nodules on Albizia julibrissin, Glycine max, Leucaena leucocephala and Phaseolus vulgaris.
A dendrogram based on whole-cell protein patterns, an alignment of the insertion within the 16S rRNA genes of the novel strains and results of DNA–DNA hybridization are available as supplementary material with the online version of this paper.
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