Rice SPK, a calmodulin-like domain protein kinase, is required for storage product accumulation during seed development: phosphorylation of sucrose synthase is a possible factor. - Asano,T..; Kunieda,N..; Omura,Y..; Ibe,H..; Kawasaki,T..; Takano,M..; Sato,M..; Furuhashi,H..; Mujin,T..; Takaiwa,F..; Wu,C..Y..; Tada,Y..; et al. (Plant Cell, 2002)