Hygrochasia
Hygrochasia (from Greek hygro- “moist, wet”, chasis “gap”) is the opening of fruits or fruit bunches after moistening.
Hygrochasia occurs when fruits or fruit clusters open when moistened (rain or dew) and close when dry (e.g. in species of the genera Delosperma , Lithops , Mesembryanthemum , Sedum and Veronica ). The opening movement occurs due to swelling processes in cell walls (hygroscopic movements) and due to the different alignment of the microfibrils. It is mainly found in plants in dry locations.
It is divided into:
- Euhygrochasia : repeated opening and closing, which allows spreading with the help of other mechanisms;
- Hemihygrochasia : repeated stretching and rolling up of ballochoric species that causes dissemination ;
- Pseudohygrochasia : fruits that do not burst with a hygroscopic calyx.
See also
literature
- Eduard Strasburger : Textbook of botany . 36th edition, revised by Andreas Bresinsky, Spektrum Akademischer Verlag, Heidelberg 2008, ISBN 978-3-8274-1455-7 .
- Gerhard Wagenitz : Dictionary of botany. The terms in their historical context. 2nd, expanded edition. Spectrum Academic Publishing House, Heidelberg / Berlin 2003, ISBN 3-8274-1398-2 .
Individual evidence
- ↑ W. Ruhland (Ed.): Handbuch der Pflanzenphysiologie. Volume VII: Physiology of Movements , Part 2, Springer, 1962, ISBN 978-3-642-94853-4 , p. 716 f.
- ↑ Marie Lhotská: contribution to the Termiologie Diasporologie. In: Folia Geobotanica et Phytotaxonomica. Volume 10, Issue 1, 1975, pp. 105-108, doi : 10.1007 / BF02855106 .