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Nocardiopsis lucentensis and thiourea co-application mitigates arsenic stress through enhanced antioxidant metabolism and lignin accumulation in rice

AbdElgawad, Hamada ; Negi, Pooja ; Zinta, Gaurav ; Mohammed, Afrah E. ; Alotaibi, Modhi O. ; Beemster, Gerrit ; Saleh, Ahmed M. ; Srivastava, Ashish Kumar

The Science of the total environment, 2023-05, Vol.873, p.162295-162295, Article 162295 [Periódico revisado por pares]

Netherlands: Elsevier B.V

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  • Título:
    Nocardiopsis lucentensis and thiourea co-application mitigates arsenic stress through enhanced antioxidant metabolism and lignin accumulation in rice
  • Autor: AbdElgawad, Hamada ; Negi, Pooja ; Zinta, Gaurav ; Mohammed, Afrah E. ; Alotaibi, Modhi O. ; Beemster, Gerrit ; Saleh, Ahmed M. ; Srivastava, Ashish Kumar
  • Assuntos: Actinomycetes ; Antioxidant ; Antioxidants - metabolism ; Arsenic - metabolism ; Arsenic - toxicity ; Heavy metal ; Lignin ; Lignin - metabolism ; Metabolism ; Metallothionins ; Oryza - metabolism ; Oxidative Stress ; Plants - metabolism ; Redox-homeostasis ; Seedlings - metabolism ; Thiourea - metabolism ; Thiourea - pharmacology
  • É parte de: The Science of the total environment, 2023-05, Vol.873, p.162295-162295, Article 162295
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: Arsenic (As) is a group-1 carcinogenic metalloid that threatens global food safety and security, primarily via its phytotoxicity in the staple crop rice. In the present study, ThioAC, the co-application of thiourea (TU, a non-physiological redox regulator) and N. lucentensis (Act, an As-detoxifying actinobacteria), was evaluated as a low-cost approach for alleviating As(III) toxicity in rice. To this end, we phenotyped rice seedlings subjected to 400 mg kg−1 As(III) with/without TU, Act or ThioAC and analyzed their redox status. Under As-stress conditions, ThioAC treatment stabilized photosynthetic performance, as indicated by 78 % higher total chlorophyll accumulation and 81 % higher leaf biomass, compared with those of As-stressed plants. Further, ThioAC improved root lignin levels (2.08-fold) by activating the key enzymes of lignin biosynthesis under As-stress. The extent of reduction in total As under ThioAC (36 %) was significantly higher than TU (26 %) and Act (12 %), compared to those of As-alone treatment, indicating their synergistic interaction. The supplementation of TU and Act activated enzymatic and non-enzymatic antioxidant systems, respectively, with a preference for young (TU) and old (Act) leaves. Additionally, ThioAC activated enzymatic antioxidants, specifically GR (∼3-fold), in a leaf-age specific manner and suppressed ROS-producing enzymes to near-control levels. This coincided with 2-fold higher induction of polyphenols and metallothionins in ThioAC-supplemented plants, resulting in improved antioxidant defence against As-stress. Thus, our findings highlighted ThioAC application as a robust, cost-effective ameliorative strategy, for achieving As-stress mitigation in a sustainable manner. [Display omitted] •ThioAC (thiourea + N. lucentensis) application improved rice As-tolerance by boosting redox homeostasis and root lignification.•ThioAc attenuated cellular antioxidant responses in a leaf-age specific manner.•Young and old leaves are preferentially responsive to thiourea and N. lucentensis-mediated arsenic protection, respectively.•ThioAC offers a possibility to reduce arsenic toxicity in an agricultural context.
  • Editor: Netherlands: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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