title: Effects of combined DC and AC magnetic fields on germination of hornwort seeds.
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 B ACV, the directions parallel B ACparallel), and perpendicular B ACperpendicular to the direction of total geomagnetic field (magnetic flux density BG) in the geomagnetic plane (GP). Controls consisted of seeds exposed to zero AC magnetic fields in combination with the DC magnetic field. The B ACV in combination with BG effectively promoted the germination of hornwort seeds when applied at 750 microT (RMS) at 7 Hz or 500 microT (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 microT. The B ACparallel promoted the germination of hornwort seeds more effectively than the B ACperpendicular in combination with BG when 500 and 750 microT at 7 Hz were applied.
authors.affiliation: Department of Electrical and Electronic Engineering, Faculty of Engineering, Ibaraki University, Hitachi, Ibaraki, Japan. kobayasi@ee.ibaraki.ac.jp
authors.forename: Masanori
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Naoya
authors.initials: N
authors.lastname: Soda
authors.forename: Takuya
authors.initials: T
authors.lastname: Miyo
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Ueda
mesh_terms: D004574:Electromagnetic Fields; D004781:Environmental Exposure; D018525:Germination / Q000528:radiation effects*; D006801:Humans; D008027:Light; D008280:Magnetics; D010944:Plants / Q000528:radiation effects*; D012639:Seeds / Q000528:radiation effects*; D013696:Temperature; D014867:Water
chemical_list: D014867:Water