Response of Young Nerium Oleander Plants to Long-Term Non-Ionizing Radiation

Planta · 2020 · Mixed · Low evidence

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MixedLow evidencePaper 1472

Study snapshot

PublicationPlanta · 2020

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

Response of Young Nerium Oleander Plants to Long-Term Non-Ionizing Radiation Aikaterina L Stefi, Konstantina Mitsigiorgi, Dido Vassilacopoulou, Nikolaos S Christodoulakis. Response of Young Nerium Oleander Plants to Long-Term Non-Ionizing Radiation. Planta. 2020 May 27;251(6):108. doi: 10.1007/s00425-020-03405-2. Abstract Although exposure to low frequency electromagnetic radiation is harmful to plants, LF-EM irradiated Nerium oleander seedlings exhibited enhanced development and growth, probably taking advantage of defined structural leaf deformations. Currently, evidence supports the undesirable, often destructive impact of low frequency electromagnetic (LF-EM) radiation on plants. The response of plants to LF-EM radiation often entails induction in the biosynthesis of secondary metabolites, a subject matter that is well documented. Nerium oleander is a Mediterranean plant species, which evolved remarkable resistance to various environmental stress conditions. In the current investigation, cultivated N. oleander plants, following their long-term exposure to LF- EM radiation, exhibited major structural modifications as the flattening of crypts, the elimination of trichomes and the reduction of the layers of the epidermal cells. These changes co-existed with an oxidative stress response manifested by a significant increase in reactive oxygen species at both the roots and the above ground parts, a decline in the absorbance of light by photosynthetic pigments and the substantially increased biosynthesis of L-Dopa decarboxylase (DDC), an enzyme catalyzing the production of secondary metabolites that alleviate stress. The exposed plants exhibited greater primary plant productivity, despite a manifested photosynthetic pigment limitation and the severe oxidative stress. This unique response of N. oleander to severe abiotic stress conditions may be owed to the advantage offered by a structural change consistent to an easier diffusion of CO2 within the leaves. A major plant response to an emerging "pollutant" was documented. pubmed.ncbi.nlm.nih.gov

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeanimal

Effect directionmixed

PopulationCultivated young Nerium oleander (seedlings/plants)

Sample sizeNot supplied

ExposureELF · long-term

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

After long-term exposure to low-frequency electromagnetic (LF-EM) radiation, Nerium oleander plants showed major leaf structural modifications and an oxidative stress response (increased reactive oxygen species), along with reduced light absorbance by photosynthetic pigments and increased biosynthesis of DDC. Despite pigment limitation and severe oxidative stress, exposed plants exhibited enhanced development/growth and greater primary productivity.

Outcomes measured

Plant development and growth
Leaf structural modifications (flattening of crypts, elimination of trichomes, reduced epidermal cell layers)
Oxidative stress / reactive oxygen species (roots and above-ground parts)
Photosynthetic pigment light absorbance
Biosynthesis of L-Dopa decarboxylase (DDC) / secondary metabolites
Primary plant productivity
CO2 diffusion within leaves (proposed mechanism)

Limitations

Exposure parameters (e.g., exact frequency, field strength, and exposure setup) not provided in the abstract
Sample size not reported in the abstract
Mechanistic explanation (easier CO2 diffusion) is presented as a possible interpretation

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "long-term"
  },
  "population": "Cultivated young Nerium oleander (seedlings/plants)",
  "sample_size": null,
  "outcomes": [
    "Plant development and growth",
    "Leaf structural modifications (flattening of crypts, elimination of trichomes, reduced epidermal cell layers)",
    "Oxidative stress / reactive oxygen species (roots and above-ground parts)",
    "Photosynthetic pigment light absorbance",
    "Biosynthesis of L-Dopa decarboxylase (DDC) / secondary metabolites",
    "Primary plant productivity",
    "CO2 diffusion within leaves (proposed mechanism)"
  ],
  "main_findings": "After long-term exposure to low-frequency electromagnetic (LF-EM) radiation, Nerium oleander plants showed major leaf structural modifications and an oxidative stress response (increased reactive oxygen species), along with reduced light absorbance by photosynthetic pigments and increased biosynthesis of DDC. Despite pigment limitation and severe oxidative stress, exposed plants exhibited enhanced development/growth and greater primary productivity.",
  "effect_direction": "mixed",
  "limitations": [
    "Exposure parameters (e.g., exact frequency, field strength, and exposure setup) not provided in the abstract",
    "Sample size not reported in the abstract",
    "Mechanistic explanation (easier CO2 diffusion) is presented as a possible interpretation"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "Nerium oleander",
    "low frequency electromagnetic radiation",
    "LF-EM",
    "non-ionizing radiation",
    "oxidative stress",
    "reactive oxygen species",
    "photosynthetic pigments",
    "secondary metabolites",
    "L-Dopa decarboxylase",
    "leaf anatomy",
    "plant productivity"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1007/s00425-020-03405-2
PubMed: 32462472

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