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Related Experiment Video

Updated: Jul 27, 2025

Leaf Spray Mass Spectrometry: A Rapid Ambient Ionization Technique to Directly Assess Metabolites from Plant Tissues
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Foliar spray of La

Weifen Chen1,2,3, Gaoxin Liao1,2,3, Feiyang Sun1,2,3

  • 1State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.

Environmental Science and Pollution Research International
|June 9, 2023
PubMed
Summary

Lanthanum oxide nanoparticles (La2O3 NPs) enhance fragrant rice seedling growth. The study found that a 40 mg L-1 concentration of La2O3 NPs significantly increased leaf area and improved plant morphology and physiology under both wet and dry nursery conditions.

Keywords:
Fragrant riceLeaf areaPhotosynthetic pigmentPhysiological parametersRare earth oxide nanoparticles

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Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Nanotechnology

Background:

  • Nanoparticles (NPs) are increasingly utilized in agriculture for plant growth regulation.
  • Lanthanum oxide nanoparticles (La2O3 NPs) show potential in influencing plant development.
  • Understanding La2O3 NPs' impact on rice under different nursery conditions is crucial for yield improvement.

Purpose of the Study:

  • To investigate the effects of La2O3 NPs foliar spray on the morphology and physiology of fragrant rice seedlings.
  • To compare the responses of two fragrant rice cultivars ('Xiangyaxiangzhan' and 'Yuxiangyouzhan') under wet and dry nursery conditions.
  • To determine the optimal concentration of La2O3 NPs for enhancing rice seedling development.

Main Methods:

  • Foliar application of La2O3 NPs at concentrations of 0 mg L-1 (CK), 20 mg L-1 (T1), and 40 mg L-1 (T2) to fragrant rice seedlings.
  • Cultivation of rice seedlings under both wet and dry nursery conditions.
  • Assessment of morphological parameters (e.g., leaf area, dry weight, root-shoot ratio) and physiological parameters (e.g., chlorophyll content, antioxidant properties, nitrogen metabolism enzymes).

Main Results:

  • Seedling-raising method and La2O3 NPs application significantly influenced leaf area in both rice cultivars (P < 0.05).
  • Plant morphological and physiological parameters, including leaf area, specific leaf area, chlorophyll content, antioxidant properties, and nitrogen metabolism enzyme activity, were altered by La2O3 NPs treatment.
  • The T2 concentration (40 mg L-1) of La2O3 NPs proved beneficial, significantly increasing leaf area in rice seedlings under both wet and dry nursery conditions.

Conclusions:

  • La2O3 NPs application, particularly at 40 mg L-1, positively impacts the morphology and physiology of fragrant rice seedlings.
  • The study provides a theoretical foundation for utilizing La2O3 NPs in rice cultivation to enhance seedling strength and potentially improve grain yield.
  • Findings offer valuable references for optimizing nursery management practices in fragrant rice production through nanoparticle application.