Response of Pinus sylvestris L. needles to electromagnetic fields. Cytological and ultrastructural aspects

Selga, Tūrs; Selga, M.

doi:10.1016/0048-9697(95)04921-5

Cited by 30 publications

(17 citation statements)

References 10 publications

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“…However, significant abnormalities have been detected in plants as diverse as pine trees (Selaga and Selaga 1996) and duckweed (Magone 1996) following exposure to pulsed radiation from radar installations, and there is no reason to believe that the mechanism by which they are perceived is significantly different from that in animals. It is widely accepted that continuous unmodulated radio waves are of too high a frequency to give biological effects but they do become effective when pulsed or amplitude modulated at a low frequency.…”

Section: How Do Modulated Radio Waves Give Their Effects?mentioning

confidence: 97%

“…They include changes in the motility of diatoms (McLeod et al 1987), changes in the germination and seedling growth of radish (Smith et al 1993), stimulation of root growth in maize (Muraji et al 1998) and cress (Stenz et al 1998) and cytological changes with faster resin production and senescence in mature pine trees (Selaga and Selaga 1996). Effects are most apparent at low frequencies (below a few thousand Hz) and much of the research work has concentrated on the extremely low frequency range, especially around 60 Hz, which is the frequency of domestic electricity supplies in the USA.…”

Section: Phenomenologymentioning

confidence: 99%

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Effects of Electrical and Electromagnetic Fields on Plants and Related Topics

Goldsworthy¹

2006

Plant Electrophysiology

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Anyone reading this book cannot fail to realize the importance of self-generated electric fields and currents in the energetics and control of metabolism in plants. We should therefore not be too surprised to find that externally applied fields also have effects. In this chapter, I will describe a few of the more significant findings from over a century of research and try to explain and sometimes reinterpret them in the light of more modern knowledge. The work is divided into three sections. Section 1 is on the non-polar effects of DC fields, where the effects are not related to the direction of the field. It ranges from responses to massive electric fields, such as those found in thunderstorms, to the effects of much weaker ones on the growth and differentiation of tissue cultures. Section 2 is on the polar effects of DC fields, where the direction of the response is related to the direction of the field and includes effects on polar growth and tropisms. Section 3 is on the effects of time-varying and alternating electromagnetic fields, where I will present evidence that a simple change in membrane stability can account for virtually all of the hitherto mysterious biological effects of weak electromagnetic radiation. Non-polar effects of DC electric fields High voltage natural fields and the rise and fall of electroculture PhenomenologyWork on the effects of electrical fields on plants goes back several centuries, but the first person to carry out large scale experiments was Karl Lemström, who was a Professor of Physics at Helsinki. He had paid several visits to the Arctic, and was surprised how green and healthy the vegetation looked, despite the low light and temperature. He wondered whether this might be due to the weak electric currents carried through the atmosphere by air ions from the aurora borealis. His suspicions were confirmed when he looked at

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Section: How Do Modulated Radio Waves Give Their Effects?mentioning

confidence: 97%

Section: Phenomenologymentioning

confidence: 99%

Effects of Electrical and Electromagnetic Fields on Plants and Related Topics

Goldsworthy¹

2006

Plant Electrophysiology

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“…Plastoglobules are subcompartments of thylakoids, containing enzymes that participate in lipid metabolic pathways. It is well documented that under biotic and abiotic stress conditions, the size, as well as the number of plastoglobules increase [62,63]. In watermelon plants, the transport of NPs from the leaves through the stem and into the roots could be traced [64].…”

Section: Ultrastructure Of Organs Of Plants Treated With Npsmentioning

confidence: 99%

The Effect of Silver and Copper Nanoparticles on the Condition of English Oak (Quercus robur L.) Seedlings in a Container Nursery Experiment

Olchowik

Bzdyk

Studnicki

et al. 2017

Forests

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Some studies indicate that metal nanoparticles can be used in plant cultivation as fungicides and growth stimulators. The aim of this study was to evaluate the effect of silver (AgNPs) and copper nanoparticles (CuNPs) on the growth parameters, on the extent of leaves infected by powdery mildew and on spontaneous ectomycorrhizal colonization of English oak (Quercus robur L.) seedlings growing in containers. Nanoparticles were applied to foliage four times during one vegetation season, at four concentrations: 0, 5, 25 and 50 ppm. The adsorption of NPs to leaves was observed by microscopical imaging (TEM). The tested concentrations of AgNPs and CuNPs did not have any significant effect on the growth parameters of the oak seedlings. TEM results showed disturbances in the shape of plastids, plastoglobules and the starch content of oak leaves treated with 50 ppm Cu-and AgNPs, while no changes in the ultrastructure of stems and roots of oak plants treated with NPs were observed. No significant difference in powdery mildew disease intensity was observed after NP foliar app lication. Four ectomycorrhizal taxa were detected on oak roots (Sphaerosporella brunnea, Thelephora terrestris, Paxillus involutus and Laccaria proxima). Oak seedlings treated (foliar) with CuNPs and AgNPs at 25 ppm were characterised by the highest degree of mycorrhization (respectively, 37.1% and 37.5%) among all treatments including the control treatment. None of the tested NPs manifested phytotoxicity in the examined Q. robur seedlings under container nursery conditions.

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“…Most of them were done during 1960s with the expectation of improving germination by electric fields, but the results varied depending on plant species, strength, and direction of the field [Jonas, 1952;Nelson and Walker, 1961]. Recently, Schmutz et al [1996] investigated the effect of long term exposure of young spruce and beech trees to 2450 MHz microwave radiation, while a group of different authors studied the effect of pulsed radiofrequency EMF from the Skrunda Radio Location Station on Spirodela polyrhiza [Magone, 1996] and pine trees [Balodis et al, 1996;Selga and Selga, 1996]. The effect of higher frequencies ($10 GHz) on the growth of cyanobacteria Nostoc and Spirulina platensis was also studied [Banik et al, 2003].…”

Section: Introductionmentioning

confidence: 97%

Influence of 400, 900, and 1900 MHz electromagnetic fields on Lemna minor growth and peroxidase activity

Tkalec

Malarić

Pevalek-Kozlina

2005

Bioelectromagnetics

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Increased use of radio and microwave frequencies requires investigations of their effects on living organisms. Duckweed (Lemna minor L.) has been commonly used as a model plant for environmental monitoring. In the present study, duckweed growth and peroxidase activity was evaluated after exposure in a Gigahertz Transversal Electromagnetic (GTEM) cell to electric fields of frequencies 400, 900, and 1900 MHz. The growth of plants exposed for 2 h to the 23 V/m electric field of 900 MHz significantly decreased in comparison with the control, while an electric field of the same strength but at 400 MHz did not have such effect. A modulated field at 900 MHz strongly inhibited the growth, while at 400 MHz modulation did not influence the growth significantly. At both frequencies a longer exposure mostly decreased the growth and the highest electric field (390 V/m) strongly inhibited the growth. Exposure of plants to lower field strength (10 V/m) for 14 h caused significant decrease at 400 and 1900 MHz while 900 MHz did not influence the growth. Peroxidase activity in exposed plants varied, depending on the exposure characteristics. Observed changes were mostly small, except in plants exposed for 2 h to 41 V/m at 900 MHz where a significant increase (41%) was found. Our results suggest that investigated electromagnetic fields (EMFs) might influence plant growth and, to some extent, peroxidase activity. However, the effects of EMFs strongly depended on the characteristics of the field exposure.

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Response of Pinus sylvestris L. needles to electromagnetic fields. Cytological and ultrastructural aspects

Cited by 30 publications

References 10 publications

Effects of Electrical and Electromagnetic Fields on Plants and Related Topics

Effects of Electrical and Electromagnetic Fields on Plants and Related Topics

The Effect of Silver and Copper Nanoparticles on the Condition of English Oak (Quercus robur L.) Seedlings in a Container Nursery Experiment

Influence of 400, 900, and 1900 MHz electromagnetic fields on Lemna minor growth and peroxidase activity

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