Kinase that phosphorylates myo-inositol to produce multiple myo-inositol monophosphates. 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(+) Expressed in roots, leaf blade shoots, leaf sheath shoots and panicles. Strong reduction in seed phytic acid with a molar equivalent increase in inorganic phosphate. Strong increase in myo-inositol levels in seeds. Belongs to the carbohydrate kinase pfkB family.