Growth of pea epicotyl in low magnetic field implication for space research

Negishi, Yoko; Hashimoto, Asako; Tsushima, Miho; Dobrotă, Cristina; Yamashita, Masamichi; Nakamura, Teruko

doi:10.1016/s0273-1177(99)00342-7

Cited by 34 publications

(28 citation statements)

References 9 publications

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“…In meristematic root cells of Pisum sativum, very low magnetic fields (magnetically shielded boxes) induce ultrastructural changes such as accumulation of lipid bodies, development of a lytic compartment (vacuoles, cytosegresomes, paramural bodies), reduction of phytoferritins in plastids, size increase of mitochondria (matrix became electron transparent, reduced cristae), and altered Ca 2+ homeostasis (Belyavskaya 2001). These changes accompany a promotion of epicotyl growth (Negishi et al 1999). Branching of plants is also affected in such shielding experiments (Govorun et al 1992;Zhadin 2001).…”

Section: Plant Growth In Zero and Weak Magnetic Fields (<100 Mt)mentioning

confidence: 99%

Magnetoreception in plants

2005

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This article reviews phenomena of magnetoreception in plants and provides a survey of the relevant literature over the past 80 years. Plants react in a multitude of ways to geomagnetic fields-strong continuous fields as well as alternating magnetic fields. In the past, physiological investigations were pursued in a somewhat unsystematic manner and no biological advantage of any magnetoresponse is immediately obvious. As a result, most studies remain largely on a phenomenological level and are in general characterised by a lack of mechanistic insight, despite the fact that physics provides several theories that serve as paradigms for magnetoreception. Beside ferrimagnetism, which is well proved for bacterial magnetotaxis and for some cases of animal navigation, two further mechanisms for magnetoreception are currently receiving major attention: (1) the "radical-pair mechanism" consisting of the modulation of singlet-triplet interconversion rates of a radical pair by weak magnetic fields, and (2) the "ion cyclotron resonance" mechanism. The latter mechanism centres around the fact that ions should circulate in a plane perpendicular to an external magnetic field with their Lamor frequencies, which can interfere with an alternating electromagnetic field. Both mechanisms provide a theoretical framework for future model-guided investigations in the realm of plant magnetoreception.

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Section: Plant Growth In Zero and Weak Magnetic Fields (<100 Mt)mentioning

confidence: 99%

Magnetoreception in plants

2005

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“…However, it is not completely understood how MF can affect the intermediate reactions in biological systems (Belyavskaya et al, 1992;Negishi et al, 1999).…”

Section: Number Of Explantsmentioning

confidence: 99%

“…Chlorophyll a, b and total chlorophyll content in the leaves of 28-day-old P. tomentosa and P. fortunei tissue cultures exposed to 2.9-4.8 mT MF at various periods delayed . Negishi et al (1999) reported that when Alaska pea epicotyls were grown at conditions where geo-magnetic field was eliminated, epicotyl development was also delayed. In our study, the leaf numbers of P. tomentosa and P. fortunei regenerated in the culture medium were also affected by MF.…”

Section: Number Of Explantsmentioning

confidence: 99%

“…Although various models were proposed for this effect, it was stated that it cannot be explained by a simple hypothesis (Soja et al, 2003). In spite of several studies, the acting mechanism has not been fully clarified (Negishi et al, 1999;Carbonell et al, 2000;Reina and Pascual, 2001). However, MF was shown to improve germination and yield in plants (Celestino et al, 2000;Martinez et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers reported that in an array of MF at the level of 10 )3 -10 )2 Tesla (T), intermediate reactions affect the chemical reactions by influencing the electron-spin positions, demonstrating the presence of a potential for biological consequences (Belyavskaya et al, 1992;Fomicheva et al, 1992). In studies at cell level, RNA and protein synthesis is influenced by the changes in strengths of MF in G 1 phase, and the rate of cell division increased in cells exposed to MF Phirke et al, 1996;Muraji et al, 1998;Negishi et al, 1999;Atak et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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The effect of magnetic field on Paulownia tissue cultures

Yaycili

Alikamanoğlu

2005

Plant Cell Tiss Organ Cult

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In this study, in vitro tissue cultures of Paulownia tomentosa and Paulownia fortunei were prepared and then exposed to a magnetic flow density of 2.9-4.8 mT and 1 m s )1 flow rate for a period of 0, 2.2, 6.6 and 19.8 s. The magnetic field (MF) increased the regeneration capability of Paulownia cultures and shortened the regeneration time. On the 28th day of culture, the positive effect of magnetic field on plant fresh weight, length, number of leaves and chlorophyll content in node explants of P. tomentosa and P. fortunei was observed. It was found that this effect varied with exposure time. When the cultures were exposed to a magnetic field with strength of 2.9-4.8 mT for 19.8 s, the regenerated P. tomentosa and P. fortunei plants dominated the control plants.

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Removal of the local geomagnetic field affects reproductive growth in Arabidopsis

Wei

Lü

et al. 2013

Bioelectromagnetics

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The influence of the geomagnetic field-removed environment on Arabidopsis growth was investigated by cultivation of the plants in a near-null magnetic field and local geomagnetic field (45 µT) for the whole growth period under laboratory conditions. The biomass accumulation of plants in the near-null magnetic field was significantly suppressed at the time when plants were switching from vegetative growth to reproductive growth compared with that of plants grown in the local geomagnetic field, which was caused by a delay in the flowering of plants in the near-null magnetic field. At the early or later growth stage, no significant difference was shown in the biomass accumulation between the plants in the near-null magnetic field and local geomagnetic field. The average number of siliques and the production of seeds per plant in the near-null magnetic field was significantly lower by about 22% and 19%, respectively, than those of control plants. These resulted in a significant reduction of about 20% in the harvest index of plants in the near-null magnetic field compared with that of the controls. These results suggest that the removal of the local geomagnetic field negatively affects the reproductive growth of Arabidopsis, which thus affects the yield and harvest index.

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Growth of pea epicotyl in low magnetic field implication for space research

Cited by 34 publications

References 9 publications

Magnetoreception in plants

Magnetoreception in plants

The effect of magnetic field on Paulownia tissue cultures

Removal of the local geomagnetic field affects reproductive growth in Arabidopsis

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