Selenium hyperaccumulators harbor a diverse endophytic bacterial community characterized by high selenium resistance and plant growth promoting properties

Frontiers in Plant Science
Martina Sura-de JongElizabeth A H Pilon-Smits

Abstract

Selenium (Se)-rich plants may be used to provide dietary Se to humans and livestock, and also to clean up Se-polluted soils or waters. This study focused on endophytic bacteria of plants that hyperaccumulate selenium (Se) to 0.5-1% of dry weight. Terminal restriction fragment length polymorphism (T-RFLP) analysis was used to compare the diversity of endophytic bacteria of hyperaccumulators Stanleya pinnata (Brassicaceae) and Astragalus bisulcatus (Fabaceae) with those from related non-accumulators Physaria bellii (Brassicaceae) and Medicago sativa (Fabaceae) collected on the same, seleniferous site. Hyperaccumulators and non-accumulators showed equal T-RF diversity. Parsimony analysis showed that T-RFs from individuals of the same species were more similar to each other than to those from other species, regardless of plant Se content or spatial proximity. Cultivable endophytes from hyperaccumulators S. pinnata and A. bisulcatus were further identified and characterized. The 66 bacterial morphotypes were shown by MS MALDI-TOF Biotyper analysis and 16S rRNA gene sequencing to include strains of Bacillus, Pseudomonas, Pantoea, Staphylococcus, Paenibacillus, Advenella, Arthrobacter, and Variovorax. Most isolates were highly resista...Continue Reading

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Jan 1, 2016·Annals of Botany·Philip J White
May 10, 2016·Industrial Biotechnology·Lauren K Redfern, Claudia K Gunsch
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Jul 3, 2019·Plants·Elizabeth A H Pilon-Smits
May 8, 2020·Journal of Fungi·Yuanming YeChu Wu
Feb 9, 2017·Journal of Environmental Quality·Michela Schiavon, Elizabeth A H Pilon-Smits
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Oct 8, 2021·Bulletin of Environmental Contamination and Toxicology·Zhen WangFei Pang
Sep 4, 2021·Metallomics : Integrated Biometal Science·Dandan YangXiaohu Zhao

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Methods Mentioned

BETA
atomic emission spectrometry
PCR
restriction digest
the

Software Mentioned

MICA3
GeneMapper
MS Excel
MALDI Biotyper
CANOCO
PAUP

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