Far-red light irradiation of intact corn seedlings affects mitochondrial and calmodulin-dependent microsomal Ca2+ transport

Microsomal fractions isolated from coleoptiles of dark or far-red light grown corn show ATP-dependent Ca²⁺ accumulation. The microsomal transport from dark but not from far-red light grown tissue could be stimulated by calmodulin. Ca²⁺ accumulation into mitochondria from coleoptiles of far-red light grown corn in also inhibited as compared to the dark controls. Light irradiation of isolated microsomes and mitochondria had no effect on either Ca²⁺ uptake nor efflux.