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Effects of combined DC and AC magnetic fields on germination of hornwort seeds
Author(s) -
Kobayashi Masanori,
Soda Naoya,
Miyo Takuya,
Ueda Yoshiro
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.20032
Subject(s) - magnetic field , physics , earth's magnetic field , germination , flux (metallurgy) , magnetic flux , field (mathematics) , biology , botany , mathematics , chemistry , quantum mechanics , organic chemistry , pure mathematics
Abstract Seeds of hornwort ( Cryptotaenia japonica Hassk ) were exposed to sinusoidally time‐varying extremely low frequency (ELF) magnetic fields (AC fields) in combination with the local geomagnetic field (DC field). Exposure lasted 24 h/day for 16 days. Three directions of the AC magnetic fields were considered; the vertical (magnetic flux density $\vec B_{ACV}$ ), the directions parallel ( $\vec B_{AC||}$ ), and perpendicular ( $\vec B_{AC \bot }$ ) to the direction of total geomagnetic field (magnetic flux density $\vec B_G$ ) in the geomagnetic plane (GP). Controls consisted of seeds exposed to zero AC magnetic fields in combination with the DC magnetic field. The $\vec B_{ACV}$ in combination with $\vec B_G$ effectively promoted the germination of hornwort seeds when applied at 750 μT (RMS) at 7 Hz or 500 μT (RMS) at 14 Hz from among the cases of individual frequencies f = 3.5, 7.0, 10.5, 14.0 Hz at 500 and 750 μT. The $\vec B_{AC||}$ promoted the germination of hornwort seeds more effectively than the $\vec B_{AC \bot }$ in combination with $\vec B_G$ when 500 and 750 μT at 7 Hz were applied. Bioelectromagnetics 25:552–559, 2004. © 2004 Wiley‐Liss, Inc.