Abstract:

Sucrose, the major product of photosynthesis in autotrophic organs, is the main transport form of carbohydrate from sites of primary assimilation to heterotrophic tissues in many plant species. During the process of transporting source from organs to sink organs, sucrose transporters (SUTs) are thought to play an important role in both loading and unloading processes. In this paper, the theroy of ‘sourse-flow-sink’ in plants and the isolation of sucrose transporter gene were firstly introduced. Then the functions of sucrose transporter were described during sucrose transporting from source to sink, in turn the relationship of sucrose transporter and agronomic traits were discussed. Furthermore, sucrose transporter could effect plant growth and development. Totally, the path of sucrose translocation mediated by sucrose transporter was summarized. However, there were still some questions in the trans-membrane transport process.