A familiar phenomenon that is observed in the early morning hours is the exudation of drops of liquid from the margins and apices of the leaves of grasses
Fig. 1

Guttation from the tips of barley leaves. (Photograph Courtesy T. W. Weier.)

and other herbaceous plants. This loss of liquid water from uninjured plants is called guttation. Under conditions favorable for rapid water absorption by the roots and unfavorable for transpiration, the development of a pressure within the xylem forces liquid out through hydathodes or special water pores in the leaves. A common procedure in the laboratory to demonstrate this fact is to place a vigorously growing, potted plant in a saturated atmosphere under a bell jar. Guttation will frequently occur within a short time (Fig. 1).


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© Springer-Verlag OHG. Berlin · Göttingen · Heidelberg 1956

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  • C. Ralph Stocking

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