Weak microwave can alleviate water deficit induced by osmotic stress in wheat seedlings.

Planta · 2009 · Benefit · Low evidence

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BenefitLow evidencePaper 6464

Study snapshot

PublicationPlanta · 2009

Study typeanimal

Reported directionBenefit

Evidence ratingLow

Abstract

The aim of the investigation is to determine the effect of microwave pretreatment of wheat seeds on the resistance of seedlings to osmotic stress. Changes in biophysical, physiological and biochemical characters were measured. The results showed: (1) The magnetic field intensity and seeds temperature increased progressively with microwave pretreatments of 5, 10, 15, 20 s and 25 s compared with controls. Although each microwave pretreatment resulted in an increase in alpha-amylase activity and photon emission intensity, the increase of alpha-amylase activity and photon emission intensity was maximal at a microwave pretreatment of 10 s. (2) Osmotic stress induced by PEG treatment enhanced the concentration of malondialdehyde, while decreasing the activities of nitricoxide synthase, catalase, peroxidase, superoxide dismutase and the concentration of nitric oxide, ascorbic acid, glutathione in the seedlings compared with controls. However, compared to osmotic stress alone, in the seedlings treated with microwave irradiation plus osmotic stress the concentration of malondialdehyde decreased, while the activities of nitricoxide synthase, catalase, peroxidase, superoxide dismutase and the concentration of nitric oxide, ascorbic acid and glutathione increased. These results suggest that a suitable dose of microwave radiation can enhance the capability to eliminate free radicals induced by osmotic stress in wheat seedlings resulting in an increase in resistance to osmotic stress.

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 directionbenefit

Populationwheat seedlings (from pretreated seeds) under PEG-induced osmotic stress

Sample sizeNot supplied

Exposuremicrowave · 5, 10, 15, 20, 25 s pretreatments

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Microwave pretreatment increased magnetic field intensity and seed temperature versus controls, and increased alpha-amylase activity and photon emission intensity (maximal at 10 s). Under PEG-induced osmotic stress, seedlings from microwave-pretreated seeds showed lower malondialdehyde and higher antioxidant-related enzyme activities and antioxidant concentrations compared with osmotic stress alone, suggesting improved resistance to osmotic stress.

Outcomes measured

magnetic field intensity
seed temperature
alpha-amylase activity
photon emission intensity
malondialdehyde concentration
nitric oxide synthase activity
catalase activity
peroxidase activity
superoxide dismutase activity
nitric oxide concentration
ascorbic acid concentration
glutathione concentration
resistance to osmotic stress (water deficit)

Limitations

Frequency and dosimetry (e.g., SAR/power density) not reported in abstract
Sample size not reported in abstract
Plant study; generalizability to humans not applicable

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": "seed pretreatment (microwave irradiation)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "5, 10, 15, 20, 25 s pretreatments"
  },
  "population": "wheat seedlings (from pretreated seeds) under PEG-induced osmotic stress",
  "sample_size": null,
  "outcomes": [
    "magnetic field intensity",
    "seed temperature",
    "alpha-amylase activity",
    "photon emission intensity",
    "malondialdehyde concentration",
    "nitric oxide synthase activity",
    "catalase activity",
    "peroxidase activity",
    "superoxide dismutase activity",
    "nitric oxide concentration",
    "ascorbic acid concentration",
    "glutathione concentration",
    "resistance to osmotic stress (water deficit)"
  ],
  "main_findings": "Microwave pretreatment increased magnetic field intensity and seed temperature versus controls, and increased alpha-amylase activity and photon emission intensity (maximal at 10 s). Under PEG-induced osmotic stress, seedlings from microwave-pretreated seeds showed lower malondialdehyde and higher antioxidant-related enzyme activities and antioxidant concentrations compared with osmotic stress alone, suggesting improved resistance to osmotic stress.",
  "effect_direction": "benefit",
  "limitations": [
    "Frequency and dosimetry (e.g., SAR/power density) not reported in abstract",
    "Sample size not reported in abstract",
    "Plant study; generalizability to humans not applicable"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave pretreatment",
    "wheat seeds",
    "osmotic stress",
    "PEG",
    "malondialdehyde",
    "antioxidant enzymes",
    "nitric oxide",
    "ascorbic acid",
    "glutathione",
    "alpha-amylase",
    "photon emission"
  ],
  "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/s00425-008-0828-8
PubMed: 18841385

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