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《Chinese Journal of Applied and Environmental Biology》 2003-01
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ROLES OF MUCILAGE CELLS AND GLYCOPROTEINSAT MESOPHYLL CELL SURFACE IN THE FREEZING TOLERANCE OFA ALPINE PLANT, RHODIOLA ALGIDA VAR. TANGUTICA

LU Cunfu **, CHEN Yuzhen & JIAN Lingcheng 1(College of Biological Sciences and Biotechnology,Beijing Forestry University, Beijing 100083,China)( 1Institute of Botany,Chinese Academy of Sciences, Beijing 100093,China)  
Rhodiola algida var. tangutica,a alpine plant growing at the snowline of Daban Mountain(h alt=4 000 m)on Qinghai Plateau,is freezing tolerant. Its lethal temperature is -26.5 ℃. After acclimatized for 20 d in summer(from July 6 to July 26)of Beijing,the new emerging leaves could only survive above -15.5 ℃. The results by photomicroscope showed that mucilage cells with high proteins and polysaccharide(or may be glycoprotein)content could be found in the leaves,especially around vascular tissues. Furthermore,cytochemical localization of glycoproteins at the mesophyll cell surfaces and in the intercellular spaces of the leaves after stained with Ruthenium Red was observed by electron transmission microscope. However,after summer acclimation in Beijing mucilage cells could not be observed and the thickness of glycoproteins at mesophyll cell surface of new emerging leaves reduced. Spaces around mucilage cells(vascular tissues)and intercellular spaces surrounded by glycoproteins at cell surface might be the primary sites of ice nucleation when the plant was subjected to freezing stress,possibly avoiding ice formation in the cells and protecting them from freezing injury. Plate 1, Fig 2, Ref 20
【Fund】: 国家自然科学基金 (3980 0 1 1 8 30 2 71 0 67);; 霍英东青年教师基金(71 0 30 );; 教育部高等学校骨干教师资助计划项目 (650 530 )资助~~
【CateGory Index】: Q945
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