能通过韧皮部向下移动的的农药，可以通过叶面用药来防治根部和维管束病虫害，从而避免土壤因子对药剂的影响，可以大大地降低农药的使用成本，提高防治效果。但到目前为止，能通过韧皮部向下输导的杀菌剂的数量相当有限。氨基糖苷类抗生素能被细菌、动物细胞主动吸收，春雷霉素可被烟草叶片主动吸收，通过烟草、水稻叶面向下输导。基于此，本研究以井冈霉素、庆大霉素、春雷霉素等氨基糖苷类农用抗生素为对象，利用激光共聚焦显微技术、荧光示踪技术，探究其在烟草、小麦、蓖麻细植株的吸收、分布、转运规律及机制，为研发经韧皮部向下输导的杀菌剂提供理论基础。

Pesticide which can moves through phloem down to root shows excellent properties on control plant diseases and insect in the roots and in vascular bundle. Phloem transported pesticides, avoiding the influence of soil, reducing the use of pesticide, improve the control effect significantly. But so far, the number of fungicide is quite limited, although in recent years there have been reports of the advent of a new fungicide. Two-way transmission of pesticide research and development is still a very important research area today. Bases on aminoglycoside antibiotics can be actively absorbed by bacteria and animal cells, kasugamycin that sprayed on leaf of tobacco and rice could translocated to the bottom site, tobacco leaf disc can actively uptake kasugamycin, Uptake, translocation and distribution of aminoglycoside antibiotics validamycin, gentamycin and kasugamycin by in tobacco, wheat and ricinus will be studyed with the mainly technology of laser confocal microscopy, fluorescence tracer, preliminary proven its regularity and mechanism, providing theoretical basis for research and development of phloem transported pesticides.