植物蔗糖合成的分子机制

Manipulation of Sucrose Synthesis in Transgenic Plants

高等植物中 ,光合同化产物主要是以蔗糖的形式从源向库运输的。近十几年来 ,随着生物技术的发展 ,许多与碳水同化产物代谢有关的基因已经被分离 ,同时多种植物遗传转化体系的建立使在植物中改变基因活性成为现实 ,对转基因植株的生理生化分析进一步增加了植物中对碳水同化产物合成、分配、运输以及利用等方面的认识。本文就CO2 固定 ,同化产物分配 ,蔗糖合成三个方面介绍近年来利用基因工程对植物源活性调控及改善的研究进展。

Sucrose is the main form of assimilated carbon to be transported from“source”to “sink” tissues in higher plants.During last decade,many genes involved in carbonhydrate metabolism have been isolated,and the development of efficient transformation system for most crop plants has allowed the creation of transgenic plants that are altered by the activity of individual genes.The physiological analysis of these transgenic plants greatly increases our understanding of the processes of photoassimilates biosynthesis,partitioning,translocation,and allocation in higher plants.This review aims to focus on the current knowledge in the area of the CO -2 fixation,partitioning,and sucrose biosynthesis,and the improvement of source strength by molecular technology. ;