During the germination of the pollen; it imbibes water and ruptures the germ pore. The intine comes out as a pollen tube which transverse the stigma and passes through the cellulose-pectic layer of the walls of papilla. From there it reaches the base; the pollen after traversing through the style reaches the ovary and then passes to the ovule and to the embryo sac. The pollen tube grows through the nucellar tissue and penetrates into the embryo sac. The pollen tube enters through the apical region of the filiform apparatus and reaches the synergids. After reaching the embryo sac the pollen tube discharges all its content into the synergid; then synergids will destroy.
