Chapter 7 Factors effecting the plant uptake
Chapter 7 Factors effecting the plant uptake
Factors effecting the plant uptake 影响养分吸收的因素主要包括介质中的养分浓度、温 度、光照强度、土壤水分、通气状况、土壤pH值、养分离 子的理化性质、根的代谢活性、苗龄、生育时期植物体内养 分状况等。 The main factors that control plant nutrients uptake as follow: the ion concentration in the nutrients medium, temperature, light, soil water, soil atmosphere, the properties and characteristics of nutrients, plant age and root activity etc
影响养分吸收的因素主要包括介质中的养分浓度、温 度、光照强度、土壤水分、通气状况、土壤pH值、养分离 子的理化性质、根的代谢活性、苗龄、生育时期植物体内养 分状况等。 The main factors that control plant nutrients uptake as follow: the ion concentration in the nutrients medium, temperature, light, soil water, soil atmosphere, the properties and characteristics of nutrients, plant age and root activity etc. Factors effecting the plant uptake
Ion concentration in the nutrient medium 在低浓度范围内,离子的吸收率随介质养分 浓度的提高而上升 在高浓度范围内,离子吸收的选择性较低, 而陪伴离子及蒸腾速率对离子的吸收速率影响较大。 When plant starved are exposed to nutrient solutions with increasing concentration of lacking nutrient, the plot of uptake may be reflected by a Michaelis-menten cure
在低浓度范围内，离子的吸收率随介质养分 浓度的提高而上升. 在高浓度范围内，离子吸收的选择性较低， 而陪伴离子及蒸腾速率对离子的吸收速率影响较大。 When plant starved are exposed to nutrient solutions with increasing concentration of lacking nutrient, the plot of uptake may be reflected by a Michaelis-Menten cure. Ion concentration in the nutrient medium
Figure 12: 86Rb*(K*)Uptake by barley roots at low and high Rbcl or Rb2 SO, Concentration Figure 13: 13NO3: Influx into roots of barley, never before exposed to NO3 2肖星 ,,0,i5,如lio如如布动 0o7。a1a3 Rbcl or Rb2SO4 CoNCENTRAT ION(mH
The effects of interruption of nutrients supply 植物对养分有反馈调节能力。中断某种养分的 供应,往往会促进植物对这一养分的吸收。 Plants which have been starved of particular nutrient may take up the nutrient at a high rate when re-supply the nutrient
植物对养分有反馈调节能力。中断某种养分的 供应，往往会促进植物对这一养分的吸收。 Plants which have been starved of particular nutrient may take up the nutrient at a high rate when re-supply the nutrient. The effects of interruption of nutrients supply
不同供磷状况对大麦各部位含磷量的影响 植物 含磷量(umog干物重) 8天P7天-P+1天+P7天-P+3天+P 地上部49(20)151(61) 412(176) 幼叶26(5)684(141)1647(483) 根系43(24)86(48) 169(94) 括号中的数字为相对值:对照为100,即整个实验期持续供给 150μmol/LP。a:不加磷生长8天。b:不加磷生长7天而后补加磷生长 1天。c:不加磷生长7天天而后补加磷生长3天
植物 含磷量（umol/g 干物重）* 8 天-P 7 天-P+1 天+P b 7 天- P b +3 天+P c 地上部 49(20) 151( 61 ) 412(176) 幼叶 26( 5 ) 684(141) 1647(483) 根系 43(24) 86( 48 ) 169( 94 ) 不同供磷状况对大麦各部位含磷量的影响 *括号中的数字为相对值：对照为1 0 0，即整个实验期持续供给 150µmol/LP。a：不加磷生长8天。b：不加磷生长7天而后补加磷生长 1天。c：不加磷生长7天天而后补加磷生长3天
10 1 0.1 胬0.01 0.001 0.010.1110100100 磷浓度(pmol/L) 外界磷浓度对生长4周的8种植物以及生长24 小时的大麦吸磷速率的影响 生长24小时 生长8周
外界磷浓度对生长4周的8种植物以及生长24 小时的大麦吸磷速率的影响 生长24小时 生长8周 0.001 0.01 0.1 1 10 0.01 0.1 1 10 100 1000 磷浓度（µmol/L） 磷吸收率（ µmol/g根鲜重 × h ）
Compartmentation of ions in plant cell Compartmentation(区隔化) of ions and meta bolites in the cell is important for normal meta bolic status Maitainning the extremely low Ca2+(<1 u M) concentration and high K(100-150mM) in cytosol is necessary. The nutrients concentration in the cytosol is regulated by the compartmentation in vacuolar. The vacuolar is thus a storage site from which the main plant nutrients may be mobilized if required for metabolic purpose
Compartmentation ( 区隔化 ) of ions and metabolites in the cell is important for normal metabolic status. Maitainning the extremely low Ca2+ (<1μM) concentration and high K+ (100-150mM) in cytosol is necessary. The nutrients concentration in the sytosol is regulated by the compartmentation in vacuolar. The vacuolar is thus a storage site from which the main plant nutrients may be mobilized if required for metabolic purpose. Compartmentation of ions in plant cell
stele cortex Ion vacuole Ion cytoplasm 根部声子收的馈控模型
[ion] [ion] vacuole cytoplasm cortex stele 根部离子吸收的反馈调控模型
K concentration in sytosol and vacuole of barley root cells as related to the K concentration in the outer solution Fernando et al. 1992) Outer solution Vacuole(mom) Cytosol(moIm 85 44 21 131
K+ concentration in sytosol and vacuole of barley root cells as related to the K+ concentration in the outer solution (Fernando et al. 1992) Outer solution Vacuole (mol/m3 ) Cytosol (mol/m3 ) 1.2 85 144 0.1 61 140 0.01 21 131