Abstract
Rhizobia may possess other plant growth-promoting mechanisms besides nitrogen fixation. These mechanisms and the tolerance to different environmental factors, such as metals, may contribute to the use of rhizobia inocula to establish a successful legume-rhizobia symbiosis. Our goal was to characterize a collection of native Portuguese chickpea Mesorhizobium isolates in terms of plant growth-promoting (PGP) traits and tolerance to different metals as well as to investigate whether these characteristics are related to the biogeography of the isolates. The occurrence of six PGP mechanisms and tolerance to five metals were evaluated in 61 chickpea Mesorhizobium isolates previously obtained from distinct provinces in Portugal and assigned to different species clusters. Chickpea microsymbionts show high diversity in terms of PGP traits as well as in their ability to tolerate different metals. All isolates synthesized indoleacetic acid, 50 isolates produced siderophores, 19 isolates solubilized phosphate, 12 isolates displayed acid phosphatase activity, and 22 exhibited cytokinin activity. Most isolates tolerated Zn or Pb but not Ni, Co, or Cu. Several associations between specific PGP mechanisms and the province of origin and species clusters of the isolates were found. Our data suggests that the isolate’s tolerance to metals and ability to solubilize inorganic phosphate and to produce IAA may be responsible for the persistence and distribution of the native Portuguese chickpea Mesorhizobium species. Furthermore, this study revealed several chickpea microsymbionts with potential as PGP rhizobacteria as well as for utilization in phytoremediation strategies.
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Acknowledgements
This work was supported by FEDER Funds through the Operational Programme for Competitiveness Factors—COMPETE and National Funds through FCT-Foundation for Science and Technology under the Project UID/AGR/00115/2013 and Project no. FCOMP-01-0124-FEDER-028316 (PTDC/BIA-EVF/4158/2012), the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 247669, and InAlentejo Project ALENT-07-0262-FEDER-001871. C. Brígido acknowledges a FCT fellowship (SFRH/BPD/94751/2013). B.R. Glick was supported by the Natural Science and Engineering Research Council of Canada.
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Supplementary Fig. 1
Maximum likelihood phylogeny of chickpea mesorhizobia isolates and type strains, based on partial 16S rRNA gene analysis (alignment length 579 bp). Kimura’s two-parameter model with a discrete gamma distribution and invariant sites was used. The three main clusters generated are marked with letters A to C. (JPG 226 kb)
Supplementary Table 1
Results obtained from the Portuguese chickpea mesorhizobia characterization in terms of specific plant growth-promoting traits and tolerance to heavy metals. nd- not determined; Classes of P solubilization: 0- no solubilization; 1-low solubilization; 2- high solubilization. Classes of siderophore production: 0 no production, 1- low production, 2- medium production, 3- high production. (JPG 31 kb)
Supplementary Table 2
Some characteristics of the soils used to obtain chickpea rhizobia isolates [data from 30 and 32]. Classes of soil pH: 1) soils with pH values below 6.5 (acid soils), 2) soils with pH values ranging from 6.5 to 7.4 (neutral soils), 3) soils with pH values above 7.4 (alkaline soils). nd- not determined (JPG 17 kb)
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Brígido, C., Glick, B.R. & Oliveira, S. Survey of Plant Growth-Promoting Mechanisms in Native Portuguese Chickpea Mesorhizobium Isolates. Microb Ecol 73, 900–915 (2017). https://doi.org/10.1007/s00248-016-0891-9
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DOI: https://doi.org/10.1007/s00248-016-0891-9