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Peer-reviewedCC BY 4.0Molecules

Photosynthetic and Antioxidant Responses of Lolium perenne to Aluminum Oxide Nanoparticles, Their Supernatant, and Aluminum Chloride Under Acidic Conditions

  • Jorge González-Villagra1
  • Valentina Figueroa2
  • Paz Cárcamo-Fincheira3
  • Marjorie Reyes-Díaz4,5
  • Gonzalo Tortella Fuentes6
  • Adalberto Benavides-Mendoza7
  • Antonio Juárez-Maldonado8
  • Ricardo Tighe-Neira2,9,10
  • Claudio Inostroza-Blancheteau2,9,10,11
11 affiliations
  1. 1Facultad de Ciencias Agrarias, Universidad de Talca, Campus Lircay, Talca 3460000, Chile
  2. 2Departamento de Ciencias Agropecuarias y Acuícolas, Facultad de Recursos Naturales, Universidad Católica de Temuco, Temuco P.O. Box 15-D, Chile
  3. 3Núcleo de Investigación en Biotecnología y Agroinnovación (NIBA), Escuela de Agronomía, Facultad de Medicina Veterinaria y Agronomía, Universidad de Las Américas, Santiago 7500975, Chile
  4. 4Departamento de Ciencias Químicas y Recursos Naturales, Facultad de Ingeniería y Ciencias, Universidad de La Frontera, Temuco P.O. Box 54-D, Chile
  5. 5Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, Temuco P.O. Box 54-D, Chile
  6. 6Centro de Excelencia en Investigación Biotecnológica Aplicada al Medio Ambiente (CIBAMA), Facultad Ingeniería y Ciencias, Universidad de La Frontera, Temuco P.O. Box 54-D, Chile
  7. 7Departamento de Horticultura, Universidad Autónoma Agraria Antonio Narro, Saltillo 25315, Mexico
  8. 8Departamento de Botánica, Universidad Autónoma Agraria Antonio Narro, Saltillo 25315, Mexico
  9. 9Núcleo de Investigación en Producción Alimentaria, Facultad de Recursos Naturales, Universidad Católica de Temuco, Temuco P.O. Box 15-D, Chile
  10. 10Laboratorio de Fisiología y Biotecnología Vegetal, Facultad de Recursos Naturales, Universidad Católica de Temuco, Temuco P.O. Box 15-D, Chile
  11. 11ANID–Millennium Science Initiative Program–Millennium Nucleus in Data Science for Plant Resilience (Phytolearning), Santiago 8370186, Chile
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Abstract

Aluminum oxide nanoparticles (Al2O3 NPs) are frequently incorporated into fertilizers and pesticides. Nevertheless, the effects of Al2O3 NPs on plants growing in acidic soils with elevated aluminum toxicity remain poorly understood. In this context, we evaluated the effects of aluminum oxide nanoparticles (Al2O3 NPs) on photosynthetic activity, gene expression, and antioxidant defense mechanisms in the Lolium perenne genotype Halo-AR1 cultivated in nutrient solution under acidic conditions. Thus, plants were subjected to Al2O3 NPs, Al2O3 NP supernatant, and AlCl3 treatments. Photosynthetic performance was significantly impaired in all treatments, as reflected by reduced CO2 assimilation, stomatal conductance, effective PSII quantum yield of PSII (ΦPSII), and electron transport rate (ETR), with stronger effects in the Al2O3 NP supernatant and AlCl3 treatments. Furthermore, Al2O3 NPs and AlCl3 downregulated the expression of the photosynthesis-related genes psbA and rbcS after 48 h of exposure. Antioxidant activity, total phenols, and flavonoid contents increased in leaves and roots, indicating activation of antioxidant defenses, particularly under Al2O3 NPs and Al2O3 NP supernatant exposure. Overall, the Al2O3 NP supernatant and AlCl3 treatments produced more pronounced effects on photosynthetic performance than the Al2O3 NP suspension under the tested conditions. However, the contributions of particulate and dissolved Al to these responses remain unresolved.

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Cite

BibTeXRIS
BibTeX
@article{gonzalezvillagra2026photosynthetic,
  title = {{Photosynthetic and Antioxidant Responses of Lolium perenne to Aluminum Oxide Nanoparticles, Their Supernatant, and Aluminum Chloride Under Acidic Conditions}},
  author = {Jorge González-Villagra and Valentina Figueroa and Paz Cárcamo-Fincheira and Marjorie Reyes-Díaz and Gonzalo Tortella Fuentes and Adalberto Benavides-Mendoza and Antonio Juárez-Maldonado and Ricardo Tighe-Neira and Claudio Inostroza-Blancheteau},
  journal = {Molecules},
  year = {2026},
  month = oct,
  doi = {10.3390/molecules31203708},
  url = {https://www.mdpi.com/1420-3049/31/20/3708},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Photosynthetic and Antioxidant Responses of Lolium perenne to Aluminum Oxide Nanoparticles, Their Supernatant, and Aluminum Chloride Under Acidic Conditions
AU  - Jorge González-Villagra
AU  - Valentina Figueroa
AU  - Paz Cárcamo-Fincheira
AU  - Marjorie Reyes-Díaz
AU  - Gonzalo Tortella Fuentes
AU  - Adalberto Benavides-Mendoza
AU  - Antonio Juárez-Maldonado
AU  - Ricardo Tighe-Neira
AU  - Claudio Inostroza-Blancheteau
PY  - 2026
DA  - 2026/10/01
JO  - Molecules
DO  - 10.3390/molecules31203708
UR  - https://www.mdpi.com/1420-3049/31/20/3708
AB  - Aluminum oxide nanoparticles (Al2O3 NPs) are frequently incorporated into fertilizers and pesticides. Nevertheless, the effects of Al2O3 NPs on plants growing in acidic soils with elevated aluminum toxicity remain poorly understood. In this context, we evaluated the effects of aluminum oxide nanoparticles (Al2O3 NPs) on photosynthetic activity, gene expression, and antioxidant defense mechanisms in the Lolium perenne genotype Halo-AR1 cultivated in nutrient solution under acidic conditions. Thus, plants were subjected to Al2O3 NPs, Al2O3 NP supernatant, and AlCl3 treatments. Photosynthetic performance was significantly impaired in all treatments, as reflected by reduced CO2 assimilation, stomatal conductance, effective PSII quantum yield of PSII (ΦPSII), and electron transport rate (ETR), with stronger effects in the Al2O3 NP supernatant and AlCl3 treatments. Furthermore, Al2O3 NPs and AlCl3 downregulated the expression of the photosynthesis-related genes psbA and rbcS after 48 h of exposure. Antioxidant activity, total phenols, and flavonoid contents increased in leaves and roots, indicating activation of antioxidant defenses, particularly under Al2O3 NPs and Al2O3 NP supernatant exposure. Overall, the Al2O3 NP supernatant and AlCl3 treatments produced more pronounced effects on photosynthetic performance than the Al2O3 NP suspension under the tested conditions. However, the contributions of particulate and dissolved Al to these responses remain unresolved.
SN  - 1420-3049
ER  -