Yong, Jean W.H
- Department of Biosystems and Technology, Swedish University of Agricultural Sciences
Abstract
This study investigated the physiological and molecular responses of rice genotype '9311' to Cd stress and the mitigating effects of silicon oxide nanoparticles (SiO NPs). Cd exposure severely hindered plant growth, chlorophyll content, photosynthesis, and Cd accumulation. However, SiO NPs supplementation, particularly the SiONP100 treatment, significantly alleviated Cd-induced toxicity, mitigating the adverse effects on plant growth while maintaining chlorophyll content and photosynthetic attributes. The SiONP100 treatment also reduced Cd accumulation, indicating a preference for Si uptake in genotype 9311. Complex interactions among Cd, Si, Mg, Ca, and K were uncovered, with fluctuations in MDA and H2O2 contents. Distinct morphological changes in stomatal aperture and mesophyll cell structures were observed, including changes in starch granules, grana thylakoids, and osmophilic plastoglobuli. Moreover, following SiONP100 supplementation, genotype 9311 increased peroxidase, superoxide dismutase, and catalase activities by 56%, 44%, and 53% in shoots and 62%, 49%, and 65% in roots, respectively, indicating a robust defense mechanism against Cd stress. Notably, OsNramp5, OsHMA3, OsSOD-Cu/Zn, OsCATA, OsCATB, and OsAPX1 showed significant expression after SiO NPs treatment, suggesting potential Cd translocation within rice tissues. Overall, SiO NPs supplementation holds promise for enhancing Cd tolerance in rice plants while maintaining essential physiological functions.
Keywords
Antioxidants; Cadmium; Genetic mechanism; Rice; Sustainable agriculture; Silicon
Published in
Ecotoxicology and Environmental Safety
2023, volume: 268, article number: 115699
SLU Authors
Global goals (SDG)
SDG2 Zero hunger
SDG6 Clean water and sanitation
SDG11 Sustainable cities and communities
UKÄ Subject classification
Environmental Sciences
Agricultural Science
Publication identifier
- DOI: https://doi.org/10.1016/j.ecoenv.2023.115699
Permanent link to this page (URI)
https://res.slu.se/id/publ/126767