Hydathode
Hydathodes or water crevices are a special form of water-separating glands consisting of groups of small, chlorophyll-free cell groups , which are found in numerous plants (mostly covering plants ). They can be used to actively or passively excrete water even at very high humidity. Such a water separation by living cells with energy expenditure is called guttation . There are two types of hydathodes: passive hydathodes, in which guttation takes place via the root pressure , and active hydathodes, in which guttation takes place in the hydathodes themselves with energy consumption.
Hydathodes are often located on the tips of the leaves (e.g. in sweet grasses ), on the teeth of the leaf margin (e.g. in lady's mantle ) or at the end of large leaf veins (e.g. in nasturtiums ). The name is formed from hydato- (nominative hydor ) "water" and hodos (f) "way". A special form of Trichom -Hydathode is the Perldrüse .
swell
- Peter Sitte , Elmar Weiler , Joachim W. Kadereit , Andreas Bresinsky , Christian Körner : Textbook of botany for universities . Founded by Eduard Strasburger . 35th edition. Spektrum Akademischer Verlag, Heidelberg 2002, ISBN 3-8274-1010-X .