石山棕营养器官的解剖结构特征

研究了石山棕营养器官的解剖结构,结果表明,石山棕营养器官具有发达的保护组织、输导组织、光合组织和机械组织。主要表现为:叶表皮角质膜发达,复表皮富含丹宁,栅栏组织发达(2.5层);根原生木质部束数多(31原),导管和筛管多,大量的薄壁细胞的细胞壁在根成熟后转化为机械组织;茎、叶柄和叶脉的木质部、韧皮部发达,维管束鞘细胞层次多并高度次生木化加厚,茎、叶柄具较多纤维;根、茎的栓化层发达。石山棕的营养器官具有良好的适应干旱、高温、瘦瘠的岩溶石山环境的生态结构,

Study on anatomical structure of Guihaia argyrata

Anatomical structure of Guihaia argyrata had been studied. The results showed that the cuticle of the leaf was thick,the cells of the multiple epidermis had plentiful tannin, the average of palisade's layer was 2.5, the root had 31 protoxylems and great number of vessels and sieves, more than half of all parenchymas in the root became mechanical tissue after the root had grown, the bundles in the stem,petiole and the vein had developed xylem,phloem and bundle sheath,and the cells of the bundle sheath were several layers and had thick secondary wall, there were many libres in the stem and the petiole, the phellems of the stem and the root were thick.Guihaia argyrata had very excellent ecological structures,such as very developed protective tissue,photosynthesis tissue,conducting tissue and mechanical tissue to adapt to the drought,high temperature and unproductive karst environment.