[Effects of lanthanum on root membrane permeability and nutrient contents in root exudate of rice].
This study showed that when lanthanum was in lower concentration (< or = 50 microg x ml(-1)), the membrane permeability of rice root was stabilized by decreasing the electrolyte exosmosis, and the contents of K+, Ca2+, P and H+ in root exudate were lower than the control; while the concentration of La3+ was in the range of 100-400 microg x ml(-1), the electrolyte exosmosis was reduced in the first 6 hours, and then significantly increased. When the concentration of La3+ was over 500 microg x ml(-1), the electrolyte exosmosis was continuously enlarged because of the destruction of the membrane. Under this condition, K+, Ca2+, P and H+ in root exudate were higher than the control. It could be concluded that the concentration of 50 microg x ml(-1) La3+ was safe to rice growing.
Gao
Hongjian
H
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. ghj7155@sina.com
Chang
Jiang
J
Zhang
Zili
Z
Jiang
Xin
X
Zhao
Zhenhua
Z
D002118:Calcium / Q000378:metabolism; D002463:Cell Membrane Permeability / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D017136:Ion Transport / Q000187:drug effects; D007811:Lanthanum / Q000494:pharmacology*; D012275:Oryza / Q000254:growth & development / Q000378:metabolism*; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism; D011522:Protons
D011522:Protons; D007811:Lanthanum; D011188:Potassium; D002118:Calcium