The Comparative Studies On Anatomy Of Cornus Alba Linn. Under Two Different Ecosystems

Paraffin section technique and light microscopy were used to investigate the anatomy of Cornus alba Linn. living in ecosystem-xeric and humid environment in Changchun city, including petioles and vanes. The results show that Cornus alba Linn. living batter in humid environment and have the structure adapt to it.Xeromorphic Cornus alba Linn. collected in the campus of Northeast Normal University have the typical pile type of Cornus alba Linn. which have lots of T-shaped piles on the leaf epidermis. This type can protect and reduce humidity evaporation. Meanwhile, plants can be protect to avoid ambustion by the hard light with more epidermal hairs. And so does more cuticles cells. The leaves are thicker while the aerenchyma are not as derdeveloped as the plants living in humid environment in Jilin Agricultural University. The results show that Cornus alba Linn. change its structure to adapt to the dry and oxygen-poor environment. The vanes and petioles colored red when dyed, which means fibration and are different than the hygrophyte. Cornus alba Linn. living in Jilin Agricultural University have the typical humid-structure. They have few T-shaped piles on the leaf epidermis which are hard to see under the light microscopy. It seems like retrogressive in humid environment. Pore-reducing, big gap and no sink. Vanes are huge and thin, have aerenchyma while palisade tissue almost retrogressived. Petioles magnify and with two ply collenchymas, which are the behavior of Cornus alba Linn. to absorbing more moisture and light to adapt to humid environment. This is a huge difference with the plants living in Northeast Normal University.Using biometrical method to study mathematical statistics of the length of T-shaped piles on the leaf epidermis, diameter of vanes main vein and petioles, and so on. The results show that all the dates mentioned above have the relationship with environment. Three groups each of thirty dates show that Cornus alba Linn. living in humid environment have few epidermal hairs, thinner vanes main vein and thicker petioles.Experiment results of comparative structure study of vanes and petioles of Cornus alba Linn. living in two ecosystem effectively prove that the plants living in different environments developed different structures. Cornus alba Linn. adapted to humid environment with plenty light. The experiment results show that environment can directly influence on the structure, structure can also adjust the function so as to adapt to different environments.Experiment results found the structural botany evidence for Cornus alba Linn.and offered the first hand materials of Cornus alba Linn. living great in Changchun by way of botany. Doing some basic work of urban beautification, environmental renovation, development and utilization economy value of Cornus alba Linn. for drug in Changchun.