Seed priming with nano-silica effectively ameliorates chromium toxicity in Brassica napus

Plant yield is severely hampered by chromium (Cr) toxicity, affirming the urgent need to develop strategies to suppress its phyto-accumulation. Silicon dioxide nanoparticles (SiO2 NPs) have emerged as a provider of sustainable crop production and resistance to abiotic stress. But, the mechanisms by...

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Published in:Journal of hazardous materials 2023-09, Vol.458, p.131906-131906, Article 131906
Main Authors: Ulhassan, Zaid, Yang, Su, He, Di, Khan, Ali Raza, Salam, Abdul, Azhar, Wardah, Muhammad, Sajid, Ali, Skhawat, Hamid, Yasir, Khan, Imran, Sheteiwy, Mohamed Salah, Zhou, Weijun
Format: Article
Language:English
Subjects:
Antioxidants defense system
Heavy metals stress
Nanotechnology
Oilseed crops
Oxidative stress
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Summary:Plant yield is severely hampered by chromium (Cr) toxicity, affirming the urgent need to develop strategies to suppress its phyto-accumulation. Silicon dioxide nanoparticles (SiO2 NPs) have emerged as a provider of sustainable crop production and resistance to abiotic stress. But, the mechanisms by which seed-primed SiO2 NPs palliate Cr-accumulation and its toxic impacts in Brassica napus L. tissues remains poorly understood. To address this gap, present study examined the protective efficacy of seed priming with SiO2 NPs (400 mg/L) in relieving the Cr (200 µM) phytotoxicity mainly in B. napus seedlings. Results delineated that SiO2 NPs significantly declined the accumulation of Cr (38.7/35.9%), MDA (25.9/29.1%), H2O2 (27.04/36.9%) and O2• (30.02/34.7%) contents in leaves/roots, enhanced the nutrients acquisition, leading to improved photosynthetic performance and better plant growth. SiO2 NPs boosted the plant immunity by upregulating the transcripts of antioxidant (SOD, CAT, APX, GR) or defense-related genes (PAL, CAD, PPO, PAO and MT-1), GSH (assists Cr-vacuolar sequestration), and modifying the subcellular distribution (enhances Cr-proportion in cell wall), thereby confer tolerance to ultrastructural damages under Cr stress. Our first evidence to establish the Cr-detoxification by seed-primed SiO2 NPs in B. napus, indicated the potential of SiO2 NPs as stress-reducing agent for crops grown in Cr-contaminated areas. [Display omitted] ●Notable SiO2 NPs localization in seed tissues labeled with PDMPO (Si-florescent marker).●Seed-primed SiO2 NPs reduces Cr-accumulation and raises plant growth and biomass.●Under Cr stress, SiO2 NPs enhances nutrients uptake and photosynthetic efficiency.●SiO2 NPs restricts Cr-aided oxidative damages and activates antioxidants defense system.●SiO2 NPs regulates Cr-subcellular distribution and protects ultra-cellular structures.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2023.131906