transpiration stream


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transpiration stream

the flow of water through a live plant as a result of water loss due to TRANSPIRATION through the leaves.
References in periodicals archive ?
This paper's estimation of sugarcane herbicide bioconcentration relies on several assumptions: degradation in the soil and its metabolism and dilution in the plant are described by first order kinetic equation; the plant uses the water transpiration stream to uptake the herbicide from the soil solution; soil solution herbicide present in concentrations that are available for plant uptake; and the plant distributes the herbicide throughout itself by transpiration.
soil], is the herbicide concentration factor in the transpiration stream in relation to the soil solution, [C.
In plants stomata response to soil drying is mediated by ABA, originating from roots and transported to the shoot via the transpiration stream.
Much of the ABA in the transpiration stream is taken up and metabolized by the mesophyll cells.
The researchers modified genes specifically around the plant's water conducting pipes (xylem) so that salt is removed from the transpiration stream before it gets to the shoot.
It belongs to the basic concept of this theory to consider the transpiration stream to be forced merely by the surface tension of the transpiring menisci in the leaves.
Calcium is usually considered phloem immobile, and its movement in plants generally follows the transpiration stream via the xylem (Hanger, 1979; Hanson, 1983; Kirkby and Pilbeam, 1984; Marschner, 1974, 1986).
The VL/Con treatment may have provided seeds with high levels of Ca by the same apoplastic pathway or via the transpiration stream.
This is the same conclusion as that reached by Grubb (1977) who reported various experiments and observations that showed that transpiration rates were not directly related to the amounts of ions transported, and by Smith (1991) who reviewed the relationship between ion transport and the transpiration stream and concluded that as the rate of flow decreased the concentration in the xylem sap increased, thus maintaining a supply of nutrients to even slowly transpiring leaves.
If no recycling of minerals from tissue to the xylem stream occurred, then x would represent the average mineral concentration in the transpiration stream during the period represented by m and R, and if x were constant, the relationship of m to R would be linear.
If nutrients were taken up passively and moved through the plant in the transpiration stream, then the highest concentrations would be expected in leaf lamina.