藜科植物轴器官的结构多样性初探

植物在长期发展与进化过程中形成了拥有不同形态结构和生殖能力的有机体，形成了从细胞，组织，器官到物种个体形态结构的多样性，通过对我国西北地区藜科23属，42种植物根，茎基和茎轴器官的比较解剖表明，轴器官的结构式样包括：基本结构式样，皮层维管束，同心环状排列的附加维管束，螺旋状排列的附加维管束，内涵韧皮部5种结构式样及过渡类型，附加维管束间的结合组织的类型可分为厚壁木质化型，径向厚壁型和薄壁型3种式样及过渡类型，研究表明黎科植物轴器官在解剖学上表现出结构的多样性，从器官结构多样性的研究层面上可折射出其分类群的物种基因组成和表达的多样性，这种结构多样性是植物在进化中环境和基因共同作用的结果，达到与其生存环境和谐的结构与功能的统一的多样性，也应属生物多样性的范畴。

On structure diversity in the axes of Chenopodiaceae

It results in living organism with different morphology and different reproductive capacity as the evolution of plant species,and results in diversity of the cell,tissue,organ and plant species.Normal structure pattern and anomalous structure pattern occur in the axes by comparative anatomy of 42 species belonging to 23 genera of Chenopodiaceae in the Northwest of China.The stems of 8 species belonging to 6 genera and the roots of genus of Haloxylon (2 species) ,as well as the central cylinder of all species examined,possess normal structure pattern.The other 36 species belonging to 18 genera possess supernumerary vascular cylinder in the axes,which the type includes cortical bundle,supernumerary vascular bundles in concentric pattern,supernumerary bundles in spiral pattern and interxylary phloem pattern.There are three patterns of conjunctive tissue among supernumerary bundles,including the thick walled and lignified type,radial thick walled type and thin walled type.The results show the structure diversity on anatomy in the axes of Chenopodiaceae.The diversity of species structure reflects the genetic diversity,which is the result of the gene and the environment working together.Therefore,the structure diversity is also belonging to biodiversity.