Combined endophytic inoculants enhance nickel phytoextraction from serpentine soil in the hyperaccumulator Noccaea caerulescens

Frontiers in Plant Science
Giovanna VisioliAnna Maria Sanangelantoni

Abstract

This study assesses the effects of specific bacterial endophytes on the phytoextraction capacity of the Ni-hyperaccumulator Noccaea caerulescens, spontaneously growing in a serpentine soil environment. Five metal-tolerant endophytes had already been selected for their high Ni tolerance (6 mM) and plant growth promoting ability. Here we demonstrate that individual bacterial inoculation is ineffective in enhancing Ni translocation and growth of N. caerulescens in serpentine soil, except for specific strains Ncr-1 and Ncr-8, belonging to the Arthrobacter and Microbacterium genera, which showed the highest indole acetic acid production and 1-aminocyclopropane-1-carboxylic acid-deaminase activity. Ncr-1 and Ncr-8 co-inoculation was even more efficient in promoting plant growth, soil Ni removal, and translocation of Ni, together with that of Fe, Co, and Cu. Bacteria of both strains densely colonized the root surfaces and intercellular spaces of leaf epidermal tissue. These two bacterial strains also turned out to stimulate root length, shoot biomass, and Ni uptake in Arabidopsis thaliana grown in MS agar medium supplemented with Ni. It is concluded that adaptation of N. caerulescens in highly Ni-contaminated serpentine soil can be en...Continue Reading

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Oct 4, 2014·Chemosphere·Giovanna VisioliAnna Maria Sanangelantoni
Feb 25, 2015·Frontiers in Plant Science·Giovanna VisioliAnna M Sanangelantoni
May 20, 2015·Micron : the International Research and Review Journal for Microscopy·Monica MattarozziMaria Careri

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Citations

Jan 14, 2017·Analytical and Bioanalytical Chemistry·Monica MattarozziGiovanna Visioli
Jul 25, 2019·International Journal of Molecular Sciences·Giovanni DalCorsoAntonella Furini
Jul 15, 2021·Environmental Science and Pollution Research International·Omima M El-MahdyAsmaa M Mogazy
Feb 18, 2020·Ecotoxicology and Environmental Safety·Junjie DuYongning Wu

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