Kinase that phosphorylates myo-inositol to produce multiple myo-inositol monophosphates, Ins(1)P, Ins(3)P, Ins(4)P, Ins(5)P and Ins(6)P. Participates in phytic acid biosynthesis in developing seeds. Phytic acid is the primary storage form of phosphorus in cereal grains and other plant seeds. ATP + myo-inositol = 1D-myo-inositol 3-phosphate + ADP + H(+) Strong reduction in seed phytic acid, and strong increase of inorganic phosphate and myo-inositol levels in seeds. Belongs to the carbohydrate kinase pfkB family.