Although gravitropism has been studied for many decades, many questions on plant
gravitropism, including the participation of Ca2+ ions in graviperception and signal
transduction, remain open and require new experiments. We have studied gravistimulation
and root gravitropism in the presence of the weak, alternating magnetic field that consisted
of a sinusoidal frequency of 32Hz inside a μ-metal shield. We discovered that this field
changes normally positively gravitropic cress root to exhibit negative gravitropism. Because …