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Highly purified plasma membranes were isolated by aqueous two phase partitioning methods from rice (Oryza sativa) seedling roots. The effects of lanthanum chloride (LaCl 3) on the activities of redox system of plasma membranes were studied. The reduction rate of K 3Fe(CN) 6 and the oxidation rate of NADH by plasma membranes are stimulated by LaCl 3 below the concentration of 40 μmol·L -1 , but are reduced by above the concentration of 40 μmol·L -1 . The optimal concentration of LaCl 3 is around 40 μmol·L -1 where the activity of redox system approachs to the maximum. And the possible effects of LaCl 3 on the absorption of iron element by rice seedling were discussed.
Highly purified plasma membranes were isolated by aqueous two phase partitioning methods from rice (Oryza sativa) seedling roots. The effects of lanthanum chloride (LaCl 3) on the activities of redox system of plasma membranes were studied. The reduction rate of K 3Fe (CN ) 6 and the oxidation rate of NADH by plasma membranes are stimulated by LaCl 3 below the concentration of 40 μmol·L -1, but are reduced by the concentration of 40 μmol·L -1. The optimal concentration of LaCl 3 is around 40 μmol·L -1 where the activity of redox system approachs to the maximum. And the possible effects of LaCl 3 on the absorption of iron element by rice seedling were discussed.