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Effects of a 60 Hz magnetic field on photosynthetic CO 2 uptake and early growth of radish seedlings
Author(s) -
Yano Akira,
Ohashi Yoshiaki,
Hirasaki Tomoyuki,
Fujiwara Kazuhiro
Publication year - 2004
Publication title -
bioelectromagnetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.435
H-Index - 81
eISSN - 1521-186X
pISSN - 0197-8462
DOI - 10.1002/bem.20036
Subject(s) - raphanus , germination , photosynthesis , horticulture , dry weight , cotyledon , botany , zoology , biology , chemistry
Photosynthetic CO 2 uptake rate and early growth parameters of radish Raphanus sativus L. seedlings exposed to an extremely low frequency magnetic field (ELF MF) were investigated. Radish seedlings were exposed to a 60 Hz, 50 μT rms (root mean square) sinusoidal magnetic field (MF) and a parallel 48 μT static MF for 6 or 15 d immediately after germination. Control seedlings were exposed to the ambient MF but not the ELF MF. The CO 2 uptake rate of ELF MF exposed seedlings on day 5 and later was lower than that of the control seedlings. The dry weight and the cotyledon area of ELF MF exposed seedlings on day 6 and the fresh weight, the dry weight and the leaf area of ELF MF exposed seedlings on day 15 were significantly lower than those of the control seedlings, respectively. In another experiment, radish seedlings were grown without ELF MF exposure for 14 d immediately after germination, and then exposed to the ELF MF for about 2 h, and the photosynthetic CO 2 uptake rate was measured during the short term ELF MF exposure. The CO 2 uptake rate of the same seedlings was subsequently measured in the ambient MF (control) without the ELF MF. There was no difference in the CO 2 uptake rate of seedlings exposed to the ELF MF or the ambient MF. These results indicate that continuous exposure to 60 Hz, 50 μT rms sinusoidal MF with a parallel 48 μT static MF affects the early growth of radish seedlings, but the effect is not so severe that modification of photosynthetic CO 2 uptake can be observed during short term MF exposure. Bioelectromagnetics 25:572–581, 2004. © 2004 Wiley‐Liss, Inc.