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Microwave treatment of eight seconds protects cells of Isatis indigotica from enhanced UV-B radiation lesions.

Photochemistry and photobiology · 2006 · Benefit · Low evidence

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BenefitLow evidencePaper 6433

Seeds pretreated with microwave radiation for 8 seconds (2450 MHz; wavelength 125 mm; power density 1.26 mW mm(-2)) showed enhanced resistance to subsequent UV-B exposure in 10-day-old seedlings, with lower MDA and higher AsA and UV-B-absorbing compounds, inc…

Study snapshot

PublicationPhotochemistry and photobiology · 2006
Study typeanimal
Reported directionBenefit
Evidence ratingLow

Abstract

To determine the role of microwaves in the stress resistance of plants to enhanced ultraviolet-B (UV-B) radiation, Isatis indigotica Fort. seeds were subjected to microwave radiation for 8 s (wavelength 125 mm, power density 1.26 mW mm(-2), 2450 MHz). Afterwards they were cultivated in plastic pots in an artificial-glass greenhouse maintained at 25 degrees C, 70% relative humidity, and 400 micromol mol(-1) CO2, under visible-light conditions of 1500 micromol m(-2) s(-1) for 8 h day(-1). When the seedlings were 10 days old, they were subjected to 10.08 kJ m(-2) UV-B (PAR: 220 micromol m(-2) s(-1)) radiation for 8 days. Changes in a number of physiological and biochemical characteristics and in the thermal decomposition enthalpy of biomass were measured and used as indicators of the protective capacity of microwave radiation in this experiment. Our results revealed that microwave pretreatment of seeds enhanced UV-B stress resistance in the seedlings by decreasing the concentration of malondialdehyde (MDA) and increasing the concentration of ascorbic acid (AsA) and UV-B-absorbing compounds, increasing the activities of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD), and increasing the energy accumulation of photosynthesis. All these results suggest that microwave radiation enhances plant metabolism and results in increased UV-B stress resistance. This is the first investigation reporting the use of microwave pretreatment to protect the cells of Isatis indigotica from UV-B-induced lesions.

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
PopulationIsatis indigotica Fort. seeds/seedlings (plant)
Sample sizeNot supplied
Exposuremicrowave · 2450 MHz · 8 s
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Seeds pretreated with microwave radiation for 8 seconds (2450 MHz; wavelength 125 mm; power density 1.26 mW mm(-2)) showed enhanced resistance to subsequent UV-B exposure in 10-day-old seedlings, with lower MDA and higher AsA and UV-B-absorbing compounds, increased CAT/POD/SOD activities, and increased photosynthesis energy accumulation.

Outcomes measured

  • UV-B stress resistance indicators
  • malondialdehyde (MDA) concentration
  • ascorbic acid (AsA) concentration
  • UV-B-absorbing compounds
  • catalase (CAT) activity
  • peroxidase (POD) activity
  • superoxide dismutase (SOD) activity
  • photosynthesis energy accumulation
  • thermal decomposition enthalpy of biomass

Limitations

  • Sample size not reported in abstract
  • Study conducted in a controlled greenhouse setting on a plant species; generalizability to other organisms not addressed in abstract
  • Exposure metric reported as power density; SAR not provided
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": "other",
    "frequency_mhz": 2450,
    "sar_wkg": null,
    "duration": "8 s"
  },
  "population": "Isatis indigotica Fort. seeds/seedlings (plant)",
  "sample_size": null,
  "outcomes": [
    "UV-B stress resistance indicators",
    "malondialdehyde (MDA) concentration",
    "ascorbic acid (AsA) concentration",
    "UV-B-absorbing compounds",
    "catalase (CAT) activity",
    "peroxidase (POD) activity",
    "superoxide dismutase (SOD) activity",
    "photosynthesis energy accumulation",
    "thermal decomposition enthalpy of biomass"
  ],
  "main_findings": "Seeds pretreated with microwave radiation for 8 seconds (2450 MHz; wavelength 125 mm; power density 1.26 mW mm(-2)) showed enhanced resistance to subsequent UV-B exposure in 10-day-old seedlings, with lower MDA and higher AsA and UV-B-absorbing compounds, increased CAT/POD/SOD activities, and increased photosynthesis energy accumulation.",
  "effect_direction": "benefit",
  "limitations": [
    "Sample size not reported in abstract",
    "Study conducted in a controlled greenhouse setting on a plant species; generalizability to other organisms not addressed in abstract",
    "Exposure metric reported as power density; SAR not provided"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave pretreatment",
    "2450 MHz",
    "Isatis indigotica",
    "UV-B radiation",
    "oxidative stress",
    "antioxidant enzymes",
    "malondialdehyde",
    "ascorbic acid",
    "photosynthesis"
  ],
  "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: 10.1562/2005-06-29-ra-595
PubMed: 16613505

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