| 释义 |
rheotropism Zool. and Bot.|riːˈɒtrəpɪz(ə)m, riːəʊˈtrəʊpɪz(ə)m|
[ad. G. rheotropismus (B. Jönsson 1883, in Ber. d. deutsch. bot. Ges. I. 521): see rheo- and tropism.]
The orientation or movement of an animal or plant in response to a current of water.
1887H. E. F. Garnsey tr. A. de Bary's Compar. Morphol. & Biol. Fungi ix. 449 Rheotropism. If a stream of water is made to flow slowly through a moistened porous substratum,..the plasmodia which are vegetating on the moist surface wander in the direction of the stream. 1898[see chemotropism]. 1965B. E. Freeman tr. Vandel's Biospeleol. xxiv. 391 Gammarids show a very strong positive reaction towards running water and swim energetically against it... The name positive rheotropism has been given to this reaction.
So rheotropic |-ˈtrɒpɪk, -ˈtrəʊpɪk| a., exhibiting or pertaining to rheotropism.
1897Ann. Bot. XI. 182 It [sc. the plasmodium] moved with the current, i.e. became negatively rheotropic. 1920A. Arber Water Plants xxii. 282 Stems responded to the stimulus by their own activity and might thus be called positively rheotropic. 1931G. K. Noble Biol. Amphibia xiv. 346 Steinmann..has reinvestigated the problem in tadpoles and newts and would attribute the rheotropic response to compensatory reflexes initiated by the labyrinth. 1968F. R. H. Jones Fish Migration xii. 269 He studied the rheotropic responses of elvers in a circular flume. |