The transmitting tissue of style is essential for the pollen tube growth.It involves pollen tube movement and has multiple roles in guidance,nutrition,adhesion.In order to study the pollination effect on the structure of style’s transmitting tissue,we observed the transmitting tissues which were pollinated or nonpollinated during the flowering of Nicotiana tabacum.The results showed that the cell death of transmitting tissue was similar to senescence in the nonpollinated style.However,the transmitting tissue had dramatic changes after pollination:the cells died rapidly.The dynamic changes of nucleus in the both pollination and nonpollination transmitting tissue were in accordance with the above.Overall,there are two different types of the death in transmitting tissue between pollination and nonpollination.