Anatomy studies on the root nodules of endangered medicinal plants Dalbergia odorifera
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.