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Relationship Between Cold Tolerance and Leaf Structure of the Three Species of Sedum(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2013 02
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Relationship Between Cold Tolerance and Leaf Structure of the Three Species of Sedum
WANG Qian GUAN Xuelian HU Zenghui LU Cunfu LENG Pingsheng
(1College of Landscape Architecture, Beijing University of Agriculture, Beijing 102206, China)
(2College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China)
Sedum cold tolerance microstructure ultrastructure
Q949.751.102 : Q945.78

In order to understand the structure adaptation mechanism of Sedum plant to cold stress, we investigated with light microscope and electronic microscope the leaf structures of wintering Sedum acre, S. spurium cv. coccineum, and S. kamtschaticum subsp. ellacombianum planted in outdoor field of Beijing region. The results showed that there were visible intercellular space and well developed aerenchyma in mesophyll. A lot of mucilage cells were found in the epiderm and around the vascular tissue. The low temperature from autumn (Oct. 12) to winter (Dec. 1), did not influence the thylakoid structure of S. acre, or obviously injured its chloroplasts, while the structure of some chloroplasts in the leaves of the other two Sedum plants was damaged. Especially in the leaves of S. kamtschaticum subsp. ellacombianum, the shape of chloroplast changed from fusiform to spheriform, and the thylakoid were disintegrated. Low temperature also led to decreased starch grains, increased mucilage cells with darkened color, and thickened waxiness layer on the epiderm in all the three sedum plants. The S. acre showed much thicker waxiness layer and more vesicles in vacuole of mesophyll cells than the other two sedum plants. The results suggested that the stronger resistance to cold stress of S. acre may result from its higher stability of chloroplast structure, larger increasing vesicles in vacuole of mesophyll cells, and visibly thicker waxiness layer on the epiderm. Fig 3, Ref 16


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Last Update: 2013-05-03