An actinomycete strain of **Nocardiopsis lucentensis** reduces arsenic toxicity in barley and maize
| Autor: | Dalal Hussien M. Alkhalifah, Wael N. Hozzein, Yasser M. Hassan, Walid Abuelsoud, Rafat Zrieq, Gerrit T.S. Beemster, Hamada AbdElgawad, Gaurav Zinta, Sébastjen Schoenaers |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element Metal toxicity 02 engineering and technology 010501 environmental sciences 01 natural sciences Plant Roots Zea mays Arsenic chemistry.chemical_compound Environmental Chemistry Metallothionein Soil Pollutants Waste Management and Disposal Biology 0105 earth and related environmental sciences 021110 strategic defence & security studies Arsenic toxicity Chemistry fungi Arsenate food and beverages Hordeum Nocardiopsis Hydrogen Peroxide Pollution Actinobacteria Horticulture Bioaccumulation Shoot Phytochelatin |
| Zdroj: | Journal of hazardous materials |
| ISSN: | 0304-3894 |
| Popis: | Accumulation of arsenic in plant tissues poses a substantial threat to global crop yields. The use of plant growth-promoting bacterial strains to mitigate heavy metal toxicity has been illustrated before. However, its potential to reduce plant arsenic uptake and toxicity has not been investigated to date. Here, we describe the identification and characterization of a Nocardiopsis lucentensis strain isolated from heavy metal contaminated soil. Inoculation with this bioactive actinomycete strain decreased arsenic root and shoot bioaccumulation in both C3 and C4 crop species namely barley and maize. Upon arsenate treatment, N. lucentensis S5 stimulated root citric acid production and the plant’s innate detoxification capacity in a species-specific manner. In addition, this specific strain promoted biomass gain, despite substantial tissue arsenic levels. Detoxification (metallothionein, phytochelatin, glutathione-S-transferase levels) was upregulated in arsenate-exposed shoot and roots, and this response was further enhanced upon S5 supplementation, particularly in barley and maize roots. Compared to barley, maize plants were more tolerant to arsenate-induced oxidative stress (less H2O2 and lipid peroxidation levels). However, barley plants invested more in antioxidative capacity induction (ascorbate-glutathione turnover) to mitigate arsenic oxidative stress, which was strongly enhanced by S5. We quantify and mechanistically discuss the physiological and biochemical basis of N. lucentensis-mediated plant biomass recovery on arsenate polluted soils. Our findings substantiate the potential applicability of a bactoremediation strategy to mitigate arsenic-induced yield loss in crops. |
| Databáze: | OpenAIRE |
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