| The morphological structure of roots, stems and leaves of annual Pugionium cornutum (L.) Gaertn in seedling stage,
vigorous growth and growth recession were observed with paraffin method. The results showed that well-developed protective tissue transfusion tissue and aqueous tissues have differentiated in seeding stage. The well-developed transfusion tissue could be found in all organics, but mechanical tissue developed badly in vigorous growth. The roots and stems have well -developed medulla with the fibrovascular tissue, which was the product of abnormal secondary growth and used for storing water and nutrition, in vigorous growth and growth recession. Specialized structures such as epidermis, accessory epidermis, bulliform cell, deep stoma, large substomatic chamber, vessel element and ring-palisade could be found in Pugionium cornutum (L.) Gaertn which adjust to the drought environment in desert. |
