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Background <p>The mismatch between the solar spectrum and chlorophyll absorption peaks, combined with magnesium (Mg) and molybdenum (Mo) deficiencies in acidic soils, critically constrains photosynthetic efficiency and crop productivity.</p> Results <p>In this study, a multifunctional nanomaterial with dual-capabilities i.e. spectral-conversion and nutrient-supply—molybdate-intercalated (MoO<sub>4</sub><sup>2−</sup>) and europium (Eu<sup>3+</sup>)-doped layered double hydroxide (MgAlEu-MoO<sub>4</sub><sup>2−</sup>-LDH)—was applied to tobacco (<i>Nicotiana tabacum</i> L.) leaves as a phyllospheric regulator. Material characterization revealed that MgAlEu-MoO<sub>4</sub><sup>2−</sup>-LDH exhibited strong absorption in the ultraviolet region and efficiently converted the absorbed energy into red emissions at 610&#xa0;nm and 706&#xa0;nm, thereby optimizing the leaf-surface light environment. Scanning electron microscopy confirmed its uniform adhesion on the leaf surface. Compared with the control (CK) and the unreacted MgAlEu-MoO<sub>4</sub><sup>2−</sup>-LDH raw material (Raw), MgAlEu-MoO<sub>4</sub><sup>2−</sup>-LDH treatment significantly enhanced plant height, leaf area, net photosynthetic rate (Pn), chlorophyll content, and accumulation of photosynthetic carbon assimilate. The Mg and Mo contents in leaves increased markedly, while malondialdehyde (MDA) levels and antioxidant enzyme activities showed no significant changes, indicating effective nutrient supplementation and no evident phytotoxicity. Mechanism analyses with transcriptomics and metabolomics further revealed that MgAlEu-MoO<sub>4</sub><sup>2−</sup>-LDH upregulated multiple genes involved in photosystem electron transport and reprogrammed the phytohormone network (downregulation of indole-3-acetic acid (IAA) and abscisic acid (ABA), and upregulation of salicylic acid (SA)).</p> Conclusions <p>Collectively, MgAlEu-MoO<sub>4</sub><sup>2−</sup>-LDH acts as a novel phyllospheric nano-regulator that synergistically couples “light-environment optimization” and “nutrient supply” to enhance photosynthetic efficiency and promote crop growth, providing a promising strategy for nanomaterial-driven sustainable agriculture.</p> Graphical abstract <p></p>

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A multifunctional LDH nano-platform enhances tobacco (Nicotiana tabacum L.) photosynthesis through phyllospheric spectral conversion and Mg/Mo nutrition

  • 期刊论文

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  • 发表日期：

    2025年12月28日

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  • Xie Yin,
  • Kai Cai,
  • Lingyu Huang,
  • Chong Wang,
  • Peng Deng,
  • Zhenyu Zhang,
  • Shuang Ming,
  • Mengdie Linghu,
  • Weichang Gao,
  • Wenjie Pan

摘要

Background

The mismatch between the solar spectrum and chlorophyll absorption peaks, combined with magnesium (Mg) and molybdenum (Mo) deficiencies in acidic soils, critically constrains photosynthetic efficiency and crop productivity.

Results

In this study, a multifunctional nanomaterial with dual-capabilities i.e. spectral-conversion and nutrient-supply—molybdate-intercalated (MoO42−) and europium (Eu3+)-doped layered double hydroxide (MgAlEu-MoO42−-LDH)—was applied to tobacco (Nicotiana tabacum L.) leaves as a phyllospheric regulator. Material characterization revealed that MgAlEu-MoO42−-LDH exhibited strong absorption in the ultraviolet region and efficiently converted the absorbed energy into red emissions at 610 nm and 706 nm, thereby optimizing the leaf-surface light environment. Scanning electron microscopy confirmed its uniform adhesion on the leaf surface. Compared with the control (CK) and the unreacted MgAlEu-MoO42−-LDH raw material (Raw), MgAlEu-MoO42−-LDH treatment significantly enhanced plant height, leaf area, net photosynthetic rate (Pn), chlorophyll content, and accumulation of photosynthetic carbon assimilate. The Mg and Mo contents in leaves increased markedly, while malondialdehyde (MDA) levels and antioxidant enzyme activities showed no significant changes, indicating effective nutrient supplementation and no evident phytotoxicity. Mechanism analyses with transcriptomics and metabolomics further revealed that MgAlEu-MoO42−-LDH upregulated multiple genes involved in photosystem electron transport and reprogrammed the phytohormone network (downregulation of indole-3-acetic acid (IAA) and abscisic acid (ABA), and upregulation of salicylic acid (SA)).

Conclusions

Collectively, MgAlEu-MoO42−-LDH acts as a novel phyllospheric nano-regulator that synergistically couples “light-environment optimization” and “nutrient supply” to enhance photosynthetic efficiency and promote crop growth, providing a promising strategy for nanomaterial-driven sustainable agriculture.

Graphical abstract