| 释义 |
paraheliotropic, a. Bot.|ˌpærəhiːlɪəʊˈtrɒpɪk|
[f. Gr. παρα- aside + ἥλιος sun + -τροπος turning + -ic: cf. heliotropic.]
Of leaves: Turning their edges in the direction of incident light.
1880C. & F. Darwin Movem. Pl. 419 The leaves of some plants when exposed to an intense and injurious amount of light direct themselves, by rising or sinking or twisting, so as to be less intensely illuminated. Such movements have sometimes been called diurnal sleep... They might be called paraheliotropic. 1881Darwin in Nature XXIII. 409/2 With several species of Hedychium, a widely-different paraheliotropic movement occurs. |