Characterization of rhizosphere fungi from selenium hyperaccumulator and nonhyperaccumulator plants along the eastern Rocky Mountain Front Range

Wangeline, Ami L.; Valdez, Jose Rodolfo; Lindblom, Stormy Dawn; Bowling, Keri L.; Reeves, F. Brent; Pilon-Smits, Elizabeth A. H.

doi:10.3732/ajb.1000369

Cited by 46 publications

(17 citation statements)

References 53 publications

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“…We did not address this, but different nodule [Se] between Se-hyperaccumulators and nonhyperaccumulators could act as a selective force for rhizobial symbionts. Rhizosphere fungal communities from seleniferous soils have been shown to have increased Se tolerance and some may be considered habitat specialists that associate with Se-hyperaccumulators ( Wangeline et al, 2011 ). Tolerance to inorganic Se forms at levels that well-exceed the nodule [Se] in all our specimens have been observed in some rhizobia isolates in vitro ( Kinkle et al, 1994 ).…”

Section: Se Localization and Speciation In Nodules -Selenium Wasmentioning

confidence: 75%

Selenium hyperaccumulation by Astragalus (Fabaceae) does not inhibit root nodule symbiosis

Alford

Pilon-Smits

Fakra

et al. 2012

American J of Botany

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Section: Se Localization and Speciation In Nodules -Selenium Wasmentioning

confidence: 75%

Selenium hyperaccumulation by Astragalus (Fabaceae) does not inhibit root nodule symbiosis

Alford

Pilon-Smits

Fakra

et al. 2012

American J of Botany

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“…The accumulation Se in peripheral tissues of young leaves and reproductive organs may be a strategy to accumulate high concentrations of Se as SeCys 2 [45], [47]–[55]. Also, rhizospheric bacteria may contribute to the high ability to accumulate Se or SeCys 2 in tissues [56], [57]. Further study should be carried out on distinguishment special SeCys 2 synthase or enhancement by rhizospheric microorganisms to explain high SeCys 2 accumulation in C. hupingshanesis .…”

Section: Discussionmentioning

confidence: 99%

A Novel Selenocystine-Accumulating Plant in Selenium-Mine Drainage Area in Enshi, China

Yuan

Zhu²,

Lin

et al. 2013

PLoS ONE

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Plant samples of Cardamine hupingshanesis (Brassicaceae), Ligulariafischeri (Ledeb.) turcz (Steraceae) and their underlying top sediments were collected from selenium (Se) mine drainage areas in Enshi, China. Concentrations of total Se were measured using Hydride Generation-Atomic Fluorescence Spectrometry (HG-AFS) and Se speciation were determined using liquid chromatography/UV irradiation-hydride generation-atomic fluorescence spectrometry (LC-UV-HG-AFS). The results showed that C. hupingshanesis could accumulate Se to 239±201 mg/kg DW in roots, 316±184 mg/kg DW in stems, and 380±323 mg/kg DW in leaves, which identifies it as Se secondary accumulator. Particularly, it could accumulate Se up to 1965±271 mg/kg DW in leaves, 1787±167 mg/kg DW in stem and 4414±3446 mg/kg DW in roots, living near Se mine tailing. Moreover, over 70% of the total Se accumulated in C. hupingshanesis were in the form of selenocystine (SeCys2), increasing with increased total Se concentration in plant, in contrast to selenomethionine (SeMet) in non-accumulators (eg. Arabidopsis) and secondary accumulators (eg. Brassica juncea), and selenomethylcysteine (SeMeCys) in hyperaccumulators (eg. Stanleya pinnata). There is no convincing explanation on SeCys2 accumulation in C. hupingshanesis based on current Se metabolism theory in higher plants, and further study will be needed.

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“…were shown earlier to be 50% inhibited in growth on medium with 50 mg Se kg 21 dry weight, and Se accumulation effectively protected plants against these pathogens (Hanson et al, 2003). In a recent study by Wangeline et al (2011), the growth of an Aspergillus leporis strain isolated from the rhizosphere of a nonhyperaccumulator plant growing in a nonseleniferous habitat was reduced by 50% when exposed to 30 mg Se L…”

Section: Discussionmentioning

confidence: 99%

“…A litter decomposition study conducted on seleniferous soil showed that native A. bisulcatus litter naturally high in Se decomposed faster and harbored higher numbers of microbes and microarthropods than low-Se alfalfa (Medicago sativa) litter collected in the same area . Furthermore, Se-tolerant fungi were isolated from the rhizosphere of hyperaccumulators A. bisulcatus and S. pinnata (Wangeline and Reeves, 2007), and rhizosphere fungi from hyperaccumulators growing on seleniferous soil were significantly more Se tolerant than fungi from nonseleniferous areas (Wangeline et al, 2011).…”

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Selenium Distribution and Speciation in the Hyperaccumulator Astragalus bisulcatus and Associated Ecological Partners

Barillas

Quinn²,

Freeman³

et al. 2012

Plant Physiology

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The goal of this study was to investigate how plant selenium (Se) hyperaccumulation may affect ecological interactions and whether associated partners may affect Se hyperaccumulation. The Se hyperaccumulator Astragalus bisulcatus was collected in its natural seleniferous habitat, and x-ray fluorescence mapping and x-ray absorption near-edge structure spectroscopy were used to characterize Se distribution and speciation in all organs as well as in encountered microbial symbionts and herbivores. Se was present at high levels (704–4,661 mg kg−1 dry weight) in all organs, mainly as organic C-Se-C compounds (i.e. Se bonded to two carbon atoms, e.g. methylselenocysteine). In nodule, root, and stem, up to 34% of Se was found as elemental Se, which was potentially due to microbial activity. In addition to a nitrogen-fixing symbiont, the plants harbored an endophytic fungus that produced elemental Se. Furthermore, two Se-resistant herbivorous moths were discovered on A. bisulcatus, one of which was parasitized by a wasp. Adult moths, larvae, and wasps all accumulated predominantly C-Se-C compounds. In conclusion, hyperaccumulators live in association with a variety of Se-resistant ecological partners. Among these partners, microbial endosymbionts may affect Se speciation in hyperaccumulators. Hyperaccumulators have been shown earlier to negatively affect Se-sensitive ecological partners while apparently offering a niche for Se-resistant partners. Through their positive and negative effects on different ecological partners, hyperaccumulators may influence species composition and Se cycling in seleniferous ecosystems.

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Characterization of rhizosphere fungi from selenium hyperaccumulator and nonhyperaccumulator plants along the eastern Rocky Mountain Front Range

Abstract: Even though Se is a commonly used antifungal agent, these results suggest that rhizosphere fungi from seleniferous habitats have widespread Se tolerance, likely an adaptive advantage in their Se-rich habitat.

Cited by 46 publications

References 53 publications

Selenium hyperaccumulation by Astragalus (Fabaceae) does not inhibit root nodule symbiosis

Selenium hyperaccumulation by Astragalus (Fabaceae) does not inhibit root nodule symbiosis

A Novel Selenocystine-Accumulating Plant in Selenium-Mine Drainage Area in Enshi, China

Selenium Distribution and Speciation in the Hyperaccumulator Astragalus bisulcatus and Associated Ecological Partners

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