Effects of magnetic flux density and direction of the magnetic field on growth and CO2 exchange rate of potato plantlets in vitro

摘要

Potato plantlets (Solanum tuberosum cv. Benimaru) were cultured in vitro for 20 days on a 10 ml MS agar medium under a magnetic flux density of 0 (control), 2, 4 or 6 mT in both upward and downward directions of magnetic field. Air temperature in the head space of the test tubes and photosynthetic flux density on the culture shelf were 25deg 1℃ and 38molm-2s-1, respectively. A magnetic flux density of around 4 mT had beneficial effects, regardless of the direction of magnetic field, on the growthpromotion and enhancement of CO2 uptake of potato plantlets in vitro. The direction of magnetic field at the magnetic flux densities tested had no effects on the growth and CO2 exchange rate.