The fundamental question of gravitational biology is how do plants perceive a gravity.
Recent experimental results have demonstrated that Ca second-messenger system has an
essential role in induction of graviresponsiveness. Our data, that stimuli of various nature
cause a rise of hyaloplasm Ca level revealed by means of pyroantimonate method, as well
as complete inhibition of the gravitropism in roots of pea seedlings, provide indirect but
consistent evidence of this role of Ca ions. A possible explaination for these results is that …