THE EFFECT OF DPC (N,N-DIMETHYL PIPERIDINIUM CHLORIDE) ON THE (CO2)-C-14-ASSIMILATION AND PARTITIONING OF C-14 ASSIMILATES WITHIN THE COTTON PLANTS INTERPLANTED IN A WHEAT STAND

DPC played an important role in regulating the production, translocati on and partitioning of C-14-assimilates in cotton (Gossypium hirsutum L.) plants. Seed soaking with DPC increased the partitioning of cotton assimilates into roots and main stem, and decreased the partitioning into seedling tip which was beneficial for the seedling. After the app earance of a square, spraying with DPC decreased the partitioning of a ssimilates into the main stem, branches and their growing points, and increased the partitioning into reproductive organs and roots. This he lped to avoid or reduce spindling, ensured a steady growth, coordinati on of the relation between vegetative and reproductive organs, and imp roved the development of floral buds. From bloom to boll-setting, spra yings with DPC greatly increased the partitioning of assimilates into reproductive organs and decreased the partioning into vegetative organ s, which was useful for the growth and development of squares and bell s.