Comparative Structure Study On Two Species Of Rosaceae Plants Living In Songnen Plain

Paraffin section technique and light microscopy were used to investigate the anatomy of twoRosaceae plants living in different ecosystem in Baicheng city and Changchun city, including stem,petioles,leaves of Pyrus ussuriensis Maxim. and Padus racemosa (Linn.) Gilib. .The results show that the plants living in Baicheng city evolve various saline-alkali resistant structure,and different plant can use different way for adapt same or similar ecosystem.The plants living in Baicheng city have respectively some salt-resistant and alkali-resistant structural characters, epidermis with corticleand,epidermal hair, well-developed palisade tissue, Crystal,and so on. P. ussuriensis has corticleand on the epidermal,it decrease transpiration and protect from microorganism.There finds much interstitial space among cells of P. racemosa,the interstitial space forms after mesoglea of cell is dissolved, and turns into the aerenchyma, oxygen that is inhaled from stoma is effectively reserved in the aerenchyma, meets demand of plant. Various crystal exists in petioles of P. racemosa living in Baicheng city. Forming crystaL associate in antidotal action of plant. Crystal exists in cells,can chang cell osmotic pressure, raise water absorption and moistureresisting powder.Also crystal collect too much salt ions in the plant ,that can avoid poison. There are epidermal hairs at the vein of P. racemosa and the petiole of P. ussuriensis .The epidermal hair protect plant from strong light ,decrease transpiration and reflect lightExperiment results of comparative structure study of two species of Rosaceae plants in two ecosystem effectively proves that two species of plant living in salted environment Baicheng city for adapting saline-alkali stress, evolve different saline-alkali stress structure.