Chapter 2 Plant nutrients uptake and transport Mechanisms
Chapter 2 Plant nutrients uptake and transport Mechanisms
Nutrient uptake steps nutrient ------------------ ■■■■■■■■■■ ■■■■I Movement through soil Cell wall Cell membrane ■■■■幅 unloading vascular tissue Cell to cell transport (plasmodesmata
Nutrient uptake steps nut Movement through soil Cell wall Cell membrane unloading vascular tissue Cell to cell transport nutrient (plasmodesmata )
THE CELL WALL Before traversing the plasma membrane(p. m), ions must first cross bulk flow of soil solution couls the cell wall and contact the p The theoretically carry inorganic ions into the cell wall and through the apoplastic athway. the thickness of a cell wall is in the range of 500 to 1000 nm it is orous
THE CELL WALL • Before traversing the plasma membrane (p.m.), ions must first cross the cell wall and contact the p.m. The bulk flow of soil solution could theoretically carry inorganic ions into the cell wall and through the apoplastic pathway. The thickness of a cell wall is in the range of 500 to 1000 nm. It is porous
表1-13一些物质的颗粒直径(毫微米nm) 分子或 水化离 分子或 颗粒离子晶子直径/秘离子晶水化离 体直径 体直径子直径 葡萄糖089 Mq2013092 0190.60Ca2+0.20088 K 027053 cr- 0.36050 NH40.30054NO30.41 Compared to cell walls(500-1000nm) the nutrient ions or molecular are very small
表1-13一些物质的颗粒直径（毫微米nm） 颗粒 分子或 离子晶 体直径 水化离 子直径 颗粒 分子或 离子晶 体直径 水化离 子直径 葡萄糖 0.89 Mg2+ 0.13 0.92 Na + 0.19 0.60 Ca2+ 0.20 0.88 K + 0.27 0.53 CI- 0.36 0.50 NH4 + 0.30 0.54 NO3 - 0.41 Compared to cell walls(500-1000nm), the nutrient ions or molecular are very small
ce|lwa!(细胞壁) The cell wall of parenchyma cells(if 壁细胞) is made up of a middle lamella (M.L.)(胞间薄层), which separated the daughter cells after cell division, and the primary wall(初生壁) which was deposited on to the m l
Cell wall (细胞壁） • The cell wall of parenchyma cells(薄 壁细胞) is made up of a middle lamella (M.L.)(胞间薄层), which separated the daughter cells after cell division, and the primary wall(初生壁） which was deposited on to the M.L