| 释义 |
geotropic, a. Bot.|dʒiːəʊˈtrɒpɪk|
[f. Gr. γεω- geo- + τροπικ-ός, f. τροπή turning.]
Pertaining to, characterized by, or of the nature of, geotropism.
1875Bennett & Dyer Sachs' Bot. 756 Internodes with an upward geotropic curvature. 1880C. & F. Darwin Movem. Pl. 81 As soon as the confluent petioles protrude from the seed they bend down, as they are strongly geotropic, and penetrate the ground. 1881McNab Bot. vi. §266. 147 The main root with the concave side of the bent portion downwards is positively geotropic, the stem with the concave side upwards is negatively geotropic. 1891F. Darwin in Nature 27 Aug. 409 Roots and other positively geotropic organs bend owing to plasticity. 1897Willis Flower. Pl. I. 21 We express this property of the root [to assume its original downward progress in growing when forcibly deflected from its course, e.g. by a stone] by saying that it is positively geotropic.
Hence geoˈtropically adv.
1882F. Darwin in Nature 27 Apr. 616 The central portion of the root..is capable of bending geotropically downwards. 1882Vines Sachs' Bot. 873 Geotropically curved stems and nodes of Grasses. 1891Athenæum 27 June 832/3 The protoplasm of heliotropically and geotropically curving cells and hyphæ. |