Symplast共质体 and apoplast,质外体 However, in practice it is probably only the outermost cells of the epidermis(including root hairs)and cortex which take up nutrients because of the depletion zones. Thus, by the time that the outermost cells have removed ions from the apoplastic solution, the concentration in the cell wall of inner cells of the cortex must be very low
• However, in practice it is probably only the outermost cells of the epidermis (including root hairs) and cortex which take up nutrients because of the depletion zones. Thus, by the time that the outermost cells have removed ions from the apoplastic solution, the concentration in the cell wall of inner cells of the cortex must be very low
Chloride(Cl-) Measurement of electrochemical gradients in cell profiles across the Potassium(*+) root show that uptake of K Low Outside Epidermis Endodermis Nonxylem Xylem cells may be active olution so or passive, but the final transfer into the xyle passive CI- into cell is active. but i oot tissues passive into xylem
• Measurement of electrochemical gradients in cell profiles across the r o o t s h o w t h a t uptake of K+ into cells may be active or passive, but the final transfer into t h e x y l e m i s passive. • CI - into c e ll is a c t i v e , b u t i s passive into xylem
The short distance transports of nutrients N、P、K,Mg等养分主要以质流的方 式通过共质体( symplast)途径运输;运输 过程中,有部分养分进入液胞( Vacuole); Ca、Si、Na、Fe(?)主要通过质 外体( apoplast)途径运输 Ca在运输过程中容易被细胞壁上的 负电荷吸附
N、P、K, Mg等养分主要以质流的方 式通过共质体(symplast)途径运输；运输 过程中，有部分养分进入液胞(Vacuole)； Ca、Si、Na、Fe（？）主要通过质 外体(poplast)途径运输。 Ca 在运输过程中容易被细胞壁上的 负电荷吸附。 The short distance transports of nutrients
The relationships of potassium content in tissue with K concentration is cytosol and vacuolar l50 125 Cytosol 75 Vacuole 0 5075100125150175 Tissue K(mM)
Cytosol Vacuole The relationships of potassium content in tissue with K concentration is cytosol and vacuolar
The effects of supplying Ca concentration on the Ca content and growth of dicotyls and monocotyledons (Loneragan Ca concentration 0.8 2.5 10 100 1000 (mM) Relative growth rate rye 43 100 94 94 93 tomato 3 19 52 100 80 Ca content(mg/g DM) rye 0.6 0.7 1.5 3.7 10.8 tomato 2.1 1.3 3.0 12.9 24.0
The effects of supplying Ca concentration on the Ca content and growth of dicotyls and monocotyledons （Loneragan） Ca concentration （mM） 0.8 2.5 10 100 1000 Relative growth rate rye 43 100 94 94 93 tomato 3 19 52 100 80 Ca content（mg/g DM） rye 0.6 0.7 1.5 3.7 10.8 tomato 2.1 1.3 3.0 12.9 24.0