Transpiration stream
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In plants, the transpiration stream is the uninterrupted stream of water which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate at the air/apoplast-interface of the substomatal cavity. It is driven in part by capillary forces, but much more by the difference in water potential between the soil and the substomatal cavity, which on is turn can be regulated through stomatal closure or opening. It allows for plants to efficiently transport water up to their highest body organs, regulate the temperature of stem and leaves during heat-generating photosynthesis and it allows for upstream signalling such as the dispersal of an apoplastic alkalinization during local oxidative stress.
[edit] References
- Felle HH, Herrmann A, Hückelhoven R, Kogel K-H (2005) Root-to-shoot signalling: apoplastic alkalinization, a general stress response and defence factor in barley (Hordeum vulgare). Protoplasma 227, 17 - 24.
- Salibury F, Ross C (1991) Plant Physiology. Brooks Cole, pp 682, ISBN 0-534-15162-0.
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