Relationship Between The Potaninia Mongolica Anatomical Structure Of The Vegetative Organ And Its Draught Adaptability

This thesis took the Potaninia mongolica Maxim, for study which is one of endemic plants in Inner Mongolia, taking13sampling points of the overall Potaninia mongolica distribution region. In this thesis, I selected wild Potaninia mongolica of13populations to observe their anatomical structures of roots, stems and leaves using the paraffin method and microscopy method. And I analyzed the Potaninia mongolica’s drought adaptability in those13regions using SPSS software and methods of the membership function method. And I discussed the relationship between the Potaninia mongolica anatomical structure of the vegetative organ and its draught adaptability in different regions. The results showed that:1. The leaves of Potaninia mongolica adapted to the arid habitats by reducing its surface area, covering the epidermal hair with epidermis, thickening and deeper dyeing cell walls, sinking stomata and differentiating into fence-like homalographic surface leaves. Potaninia mongolica roots and stems have well-developed tissue structure, and its periderm is thick and easy to fall off. I found two pieces of specific ring structure in both the secondary structure of its roots and stems. The cells are flat. The cell walls became thicker and stained deeply. They encircled the entire vascular tissue, which is significantly different from other dicots’ secondary structure. I thought they are composite cork layers. And these are specialized organ which Potaninia mongolica produced to adapt the arid habitats. They can prevent Potaninia mongolica from moisture loss, animals, pathogens or erosion damage. Therefore the vegetative organ anatomical structure is adapted to the drought environment.2. Cluster Analysis of13populations Potaninia mongolica:(1)1divided the Potaninia mongolica of13populations into3clusters based on their characteristic indexes of roots anatomical numbers. Cluster1included population No.1and4. Cluster2included population No.3,5.6,7,9,11.12and13. Cluster3included population No.2.8and10.(2)1divided the Potaninia mongolica of13populations into3clusters based on their characteristic indexes of stems anatomical numbers. Cluster1included population No.9. Cluster2included population No.1,6,10and11. Cluster3included population No.2,3,4,5,7,8,12and13.(3) I divided the Potaninia mongolica of13populations into3clusters based on their characteristic indexes of leaves anatomical numbers. Cluster1included population No.10,11,12and13. Cluster2included population No.1,3,4,5,7and8. Cluster3included population No.2,6, and9.3.Comprehensive evaluation of drought resistance for the13Potaninia mongolica populations:No.1population=No.11population>No.9population> No.12population>No.13population>No.6population=No.10population>No.4population=No.5population>No.7population>No.3population>No.8population>No.2population (Groups of equal value have similarity in drought resistant ability)...