Transport in xylem

The main result of Section 3.3 was that a flux of water occurs from a cell M to Mo when the difference in the proto-osmotic potential AVi — AVy = AV(li .) between the two favors a flux of from Mq to M. Equation (23) may be more conveniently written as 

If the transport unit is placed horizontally then M can develop a pressure difference 

In general, given any source of water S i) at a given set of values, p, Kh, and Kk and at a difference of height h i), then a plant cell (/) connected to this source of water by a generalized transport system, will cause a water influx 

Variations in the value of K(HK) of the leaves are expected due to the problem of pH regulation in the mesophyll cells discussed in Section 2.4. Around midday F(HK) of the leaves would fall and reduce the rate of uptake of water by these cells. However, the K -antiport system of the 

One mode of transport not covered by Eq. (33) is that via the Jamin chains. It is possible that between two water columns of these chains there is a thin film of electrolyte adhering to the walls of the xylem conduits by electrostatic forces of the electrical double layers. counterflux 

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