射线组织径向变异及其贮藏功能研究进展

无射线结构是部分植物木质部的显著特征，无射线结构特征可分为永久性无射线或暂时性无射线。对于暂时性无射线结构重新分化射线组织的机制尚不清楚。在射线组织的径向变异及其与环境因子关系、射线组织贮藏物质的径向变异和季节动态等方面的研究，目前还存在不一致的结论。未来对射线组织的精确分离将使单独研究射线组织与环境因子之间的关系、射线组织形成的分子生物学机制成为可能，进而揭示木质部射线组织结构形成与功能过程及其对环境的响应。

Radial Variation and Its Storage Function of Ray Tissue

The raylessness is a typical characteristic in xylem of some plants,which includes temporal and permanent absence of ray tissue.However,the redifferentiation mechanism of the temporal absence ray tissue remains unknown.The inconsistent conclusions are found between the radical variations and the environmental factors,as well as radical and seasonal variations of storage in ray tissue.The accurate separation of ray tissue makes the independent researches on the relations between ray tissue and environmental factors,as well as the molecular biological mechanisms of ray tissue formation possible,and then to reveal the structure formation and function of ray tissue responding to environments.