Ultrastructural study on the stylar transmitting tissue in Japanese pear

Summary The stylar transmitting tissue in the mature pistil of the Japanese pear consists of its component cells and intercellular heterogeneous secretions. The cytoplasm of the periplasmic region contains two different organelles that are characteristic of floral bud development. One of these is the vesicle, which is derived from rough ER and transferred to the periplasmic region of the cell during an early stage of the floral bud. The other one is the lipid droplet, which reacts to polysaccharidic staining and is seen throughout floral bud development. The lipid droplets are closely associated with the Golgi bodies and seem to be dissolved in the vacuole. The materials found in the vacuoles appear to diffuse and pass through the cell walls as intercellular substances.