27
Nov
2005

Nonthermal microwave radiations affect the hypersensitive response of tobacco to tobacco mosaic virus

//www.buergerwelle.de/pdf/italy.pdf

Betti L, Trebbi G, Lazzarato L, Brizzi M, Calzoni GL, Marinelli F, Nani D, Borghini F.

Department of Agro-Environmental Science and Technology, Faculty of Agriculture, Bologna University, Italy.

OBJECTIVES: The aim of the present study was to evaluate the effects of nonthermal extremely high-frequency microwave radiations in a plant-based bioassay, represented by tobacco plants reacting to tobacco mosaic virus with a hypersensitive response leading to the appearance of necrotic lesions at the infection sites.

DESIGN: This study was performed blind and different experimental protocols on tobacco plants inoculated with tobacco mosaic virus were used.

BIO-OBJECTS: Tobacco plants (Nicotiana tabacum L. cultivar Samsun) carrying the resistance gene N against tobacco mosaic virus.

INTERVENTIONS: Tobacco plants or leaf disks were either directly or indirectly (water-mediated) irradiated using a medical device, designed for microwave resonance therapy. It produces nonthermal weak-intensity extremely high-frequency radiations, either modulated at extremely low frequency or in continuous flux of waves, coupled with a nonthermal red/near-infrared radiation. Outcome measurements: The working variable was the number of hypersensitive lesions per leaf disk.

RESULTS: Both direct and indirect nonthermal microwave radiations led to significant effects on the hypersensitive response of tobacco plants: modulated radiations generally induced a resistance increase, whereas a continuous flux of waves induced a resistance decrease with direct treatments only.

CONCLUSIONS: Nonthermal microwave radiations are effective on the hypersensitive response of tobacco to tobacco mosaic virus and their low-frequency modulation seems to be more bioactive than the continuous-flux of waves, particularly in the indirect water-mediated treatments.

MeSH Terms:

* Biological Assay
* Microwaves*
* Plant Diseases*/virology
* Plant Leaves/radiation effects*
* Plant Leaves/virology
* Research Support, Non-U.S. Gov't
* Tobacco/radiation effects*
* Tobacco/virology
* Tobacco Mosaic Virus/immunology
* Tobacco Mosaic Virus/radiation effects*


PMID: 15673988 [PubMed - indexed for MEDLINE]

//www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=15673988&dopt=Citation


Informant: Iris Atzmon
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