文献类型：期刊文献

英文题名：CELLULAR CHANGES OF TRACHEIDS AND RAY PARENCHYMA CELLS FROM CAMBIUM TO HEARTWOOD IN CUNNINGHAMIA LANCEOLATA

作者：Song, K.[1] Liu, B.[1] Jiang, X.[1] Yin, Y.[1]

第一作者：Song, K.

通信作者：Yin, Y[1]

机构：[1]Chinese Acad Forestry, Chinese Res Inst Wood Ind, Wood Anat & Utilizat Dept, Beijing 100091, Peoples R China

年份：2011

卷号：23

期号：4

起止页码：478-487

外文期刊名：JOURNAL OF TROPICAL FOREST SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000296938400019)】；

基金：This work was financially supported by the project of the Chinese National Natural Science Foundation (No. 30972303) and the project of the Chinese Academy of Forestry (No. CAFYBB2007016). The technical help from M Xu from the Chinese Research Institute of Wood Industry, Chinese Academy of Forestry is gratefully acknowledged. We thank E Bergstrom from the Royal Institute of Technology, Sweden, for her comments on the manuscript.

语种：英文

外文关键词：Ultrastructural features; cell wall; protoplasm; heartwood formation; xylem ray cells

摘要：SONG K, LIU B, JIANG X & YIN Y. 2011. Cellular changes of tracheids and ray parenchyma cells from cambium to heartwood in Cunninghamia lanceolata. Cellular changes of the cell wall and protoplasm in tracheids and ray parenchyma cells during heartwood formation were investigated in a 26-year-old Cunninghamia lanceolata at micro- and ultrastructure levels. Cell morphological and ultrastructural features changed significantly from the cambium to inner heartwood. In the cambial zone, the thickness of fusiform and ray cell walls were thin and their radial walls were much thicker than tangential walls. Fusiform cells were highly vacuolated with the protoplasm confined to the periphery of cell lumen. At the time of wood cell differentiation, differentiating xylem mother cells began to lose the protoplasm. Concomitantly, their walls thickened and showed characteristically distinct wall layers. In comparison, ray cell walls appeared as typical polylamellate structure and had thinner walls than the tracheids. Tracheids completed their differentiation and left hollow dead tracheary elements to decline into sapwood, while the xylem ray cells remained alive. The ray cells contained cell protoplasm, although the amount, shape and size altered when shifting towards intermediate wood. Subsequently, the ray cells disintegrated their protoplasm, including the nuclei, organelles and reserve materials, which marked the formation of heartwood.