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Community structure and diversity of endophytic bacteria in seeds of three consecutive generations of Crotalaria pumila growing on metal mine residues

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Abstract

Aims

We investigated the possible transgenerational transfer of bacterial seed endophytes across three consecutive seed generations of Crotalaria pumila growing on a metal mining site in Mexico.

Methods

Seeds were collected during three successive years in the semi-arid region of Zimapan, Mexico. Total communities of seed endophytes were investigated using DNA extraction from surface sterilized seeds and 454 pyrosequencing of the V5-V7 hypervariable regions of the 16S rRNA gene.

Results

The communities consisted of an average of 75 operational taxonomic units (OTUs); richness and diversity did not change across years. Methylobacterium, Staphylococcus, Corynebacterium, Propionibacterium and eight other OTUs constituted >60% of the community in each generation. The microbiome was dominated by Methylobacterium (present in >80% of samples). Functions associated with the microbiome were C and N fixation, oxidative phosphorylation and photosynthesis activity.

Conclusions

The bacterial endophytic communities were similar across three consecutive seed generations. Among the core microbiome Methylobacterium strains were the most abundant and they can contribute to nutrient acquisition, plant growth promotion and stress resilience to their host in metal contaminated mine residues. Identification of the seed microbiome of C. pumila may lead to novel and more efficient inoculants for microbe-assisted phytoremediation.

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Acknowledgements

This research was supported by a BOF-BILA grant from Hasselt University, the Hasselt University Methusalem project 08M03VGRJ and was also part of the CONACYT project PDCPN2013-1-215241.

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Authors and Affiliations

  1. Edaphology, Colegio de Postgraduados Campus Montecillo, Montecillo, Mexico

    Ariadna S. Sánchez-López, Ma. Carmen González-Chávez & Rogelio Carrillo-González

  2. Hasselt University, Centre for Environmental Sciences, Agoralaan Building D, 3590, Diepenbeek, Belgium

    Ariadna S. Sánchez-López, Sofie Thijs, Bram Beckers, Nele Weyens & Jaco Vangronsveld

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  1. Ariadna S. Sánchez-López
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  2. Sofie Thijs
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  3. Bram Beckers
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  5. Nele Weyens
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  6. Rogelio Carrillo-González
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  7. Jaco Vangronsveld
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Correspondence to Jaco Vangronsveld.

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Sánchez-López, A.S., Thijs, S., Beckers, B. et al. Community structure and diversity of endophytic bacteria in seeds of three consecutive generations of Crotalaria pumila growing on metal mine residues. Plant Soil 422, 51–66 (2018). https://doi.org/10.1007/s11104-017-3176-2

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