濒危药用植物降香檀根瘤的解剖学研究

Anatomy studies on the root nodules of endangered medicinal plants Dalbergia odori fera

采用显微观察法对国家二级保护植物降香檀根瘤的结构进行细胞学研究。结果表明,降香檀的根瘤生长在侧根上,外表金黄色,呈球形或扁球形;根瘤结构由周皮、皮层、维管系统和侵染组织等4部分组成;根瘤菌在皮层中形成多个侵染区域,增大了根瘤的体积,增强了根瘤菌的固氮能力,更利于降香檀植物的生长发育。

The root nodules from medicinal plant Dalbergia odorifera were observed under microscope. The results showed that natural root nodules grew from the laterals only,spherical root nodules were golden brown. The structure of root nodules were composed of periderm, cortex,vascular system and tissue infected. These root nodules infected cortex cells and developed many infected regions which could increase the size of the nodule, enhance the nitrogen fixation capacity of rhizobium and the growth of plant.