ROSHANAK ERFANIAN SALIM1, MAHMOOD ZOKAEI1, AZARNOOSH JAFAREE1, MINA MOHAJER2
1Islamic Azad University, Department of Biology, Iran
2University of Tehran, Faculty of Law, Iran
Several factors have been historically applied by human for improving food production systems. Electric as well as magnetic fields have been recently experimented as a seed treatment. These fields are usually environmental- friendly and affect physiological and biological processes, thereby apply as non chemical manner in agricultural production. The white button mushroom is one the most important commercial mushrooms in the world. The effect of weak, extremely low frequency magnetic field on the mycelia growth of Agaricus bisporus was studied by exposing them to pure continuous sine-wave magnetic field of 12.5, 25 and 50 gauss at 50 HZ. Magnetic field was applied by a coil on PVC tube (radius 10cm, copper wire 1.2 mm, 4000 rounds, about 36kg wire) connected to three roast with an ampere"=meter and daily exposure (hday). The petri dishes were then centreed between the coils. Results of the study showed that the growth of mycelia at early stages of development increased at 12.5 and 25 gauss, while the mycelia growth was retarded at 50 gauss, 50 HZ. In the second part of the experiment, plates which had the Agaricus bisporus spawns exposed to wave magnetic field of 12.5, 25 and 100 gauss and their growth was evaluated by putting spawns in the solid culture at the 25⁰C in the incubator and their growth rate was compared with control after 3 days. The results revealed that growth rate of spawns in 12.5 and 25 gauss were more than control, while the growth rate of spawns in 100 gauss decreased drastically. There was no observable effect of magnetic field on the growth of mycelia. The exact mechanism, however, is unknown yet.
Keywords: Magnetic field, mycelia, white button mushroom