Absorption of mineral substances from soil and transport of ions through cellular membranes. Interaction and antagonism of ions

you are: Absorption of mineral substances from soil and transport of ions through cellular membranes

Some ions can influence absorption and transport of other ions. For example, increase of concentration Rb + in an external solution reduces absorption To +, and on the contrary; С1- and Вr- also operate as mutual antagonists. presence Na +, on the contrary, makes insignificant impact on absorption Rb +, but reduces absorption Li +. Apparently, certain groups of ions ' compete ' for specific sites of the carrier localised in a membrane. these sites, obviously, correspond to geometry of competing ions.

Absorption of this or that ion can Sometimes prevent the harmful influences caused by superfluous absorption of other ion. for example, To + and others monovalent kationy tend to reduce viscosity of cytoplasm and to increase fluidity and permeability of membranes whereas bivalent kationy, for example Sa2 +, make opposite impact. Because of such interactions named antagonism of ions, for updating of deficiency of separate mineral substances under plants usually bring mixes of salt solutions, instead of separate salts.