Abstract
Leucaena leucocephala was introduced into Panxi, Sichuan, China, in the 1980s and 1990s for afforestation and preventing water loss and soil erosion in this area. The co-introduction of rhizobial symbionts of introduced plants has drawn attention since they may influence local soil communities. We studied the phylogenetic position of the L. leucocephala isolates and assessed if the rhizobia were introduced together with the host to Panxi, Sichuan, China. The glnII and atpD genes of fifteen representative isolates were sequenced and analyzed, and applied multilocus sequence analyses in which the housekeeping genes recA, glnII and atpD were included. Furthermore, we estimated the within species diversity directly with 23S rDNA and IGS RFLP and indirectly through phenotypic analysis of forty L. leucocephala isolates. The isolates represented seven species and 38 diversified strains in the genera Ensifer, Mesorhizobium, Bradyrhizobium and Rhizobium. The within species diversity of the Ensifer isolates was large, proposing a potential to occupy novel niches. There was not conclusive evidence to show that any of the strains would have been co-introduced with L. leucocephala. On the contrary, we came to a conclusion that the possible introduction should not be inferred from sequence data alone.
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This research was supported by National Natural Science Foundation of China (31070004) and Science and Technology Support Project of Sichuan Province of China (2012RZ0018).
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Kai Wei Xu and Petri Penttinen contributed equally to this work.
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Xu, K.W., Penttinen, P., Chen, Y.X. et al. Polyphasic characterization of rhizobia isolated from Leucaena leucocephala from Panxi, China. World J Microbiol Biotechnol 29, 2303–2315 (2013). https://doi.org/10.1007/s11274-013-1396-z
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DOI: https://doi.org/10.1007/s11274-013-1396-z