Primary cell wall 细胞壁的结构 Gluey pectin layer The Structure of Cell Wall Secondly ll. 胞间层/层 middle lamella- a pectin layer between cells 初生壁 primary cell wall young cells and cells in actively growing areas(25% Primary walls Middle: cellulose. hemicellulose lamella pectins, and glycoproteins) Pectin-rich cell corner 次生壁 secondary cell wall some cells stop growing (cellulose as a main component up to 25% lignin
细胞壁的结构 The Structure of Cell Wall • 胞间层 /中层 middle lamella—— a pectin layer between cells • 初生壁 primary cell wall—— young cells and cells in actively growing areas (<25% cellulose, hemicellulose, pectins, and glycoproteins) • 次生壁 secondary cell wall—— some cells stop growing (cellulose as a main component, up to 25% lignin)
Figure 3.6A A small portion of a cell wall of the green alga Chaetomorpha melagonium, showing how cellulose microfibrils are laid own. Each microfibril is composed of numerous molecules of cellulose, x24, 000 (Electon micmgraph courtesy Eva Frei and R D. Preston)
具三层结构 细胞壁的结构 的次生壁 Three-layered 2 secondary wall 胞间层 Middle lamella Primary初生壁 wall
细胞壁的结构 胞间层 初生壁 具三层结构 的次生壁
植物细胞次生壁的组成与结构 纹孔 胞间层 (e) LAMELLA/3ENbN具三层结构的次生壁 PRIMARY WALI 初生壁 MACROFIBRI MICROFIBRIL MICELI 大纤丝 微纤丝 微团 (a) MOLECULE 微团 纤维素分子
纹孔 胞间层 具三层结构的次生壁 初生壁 大纤丝 微纤丝 微团 纤维素分子 微团 植物细胞次生壁的组成与结构
mary wall layered p19 secondary wall 345cH22H 三层的次生壁 HC CH。OH 4出3 大纤丝 macrofibril two B ucose res du 微纤丝 microfibril 纤维素分子 ce lulose molecules 纤维细胞 ls微团
大纤丝 微纤丝 微团 纤维素分子 三层的次生壁 纤维细胞