| 释义 |
plagiotropic, a. Bot.|pleɪdʒɪəʊˈtrɒpɪk|
[a. G. plagiotrop (J. von Sachs 1879, in Arbeiten Bot. Inst. Würzburg II. 227) f. plagio- + Gr. τροπικός inclined, f. τρόπος turning.]
Said of members or organs of plants, the two halves of which react differently to the influences of light, gravitation, and other external forces, and which therefore take up an oblique position: opp. to orthotropic. Hence plagioˈtropically adv.; plagiˈotropism, the condition or character of being plagiotropic.
1882Vines tr. Sachs Bot. App. 954 Sachs points out..that most monosymmetrical or bilaterally symmetrical organs present..dorsal and ventral halves..of different internal structure... When this is the case the two halves react differently to external forces (light, gravity, etc.) and the organ is, according to his terminology, plagiotropic,..some polysymmetrical organs are plagiotropic also. 1886― Physiol. Plants 502 The plagiotropism of dorsiventral organs, such as shoots and leaves,..is the resultant expression of the effect of light and of gravity upon them, promoted, in many cases, by their own weight. 1929T. Thomson tr. Büsgen's Struct. & Life Forest Trees i. 44 Much less simple to understand are the conditions which determine the position of ‘plagiotropic’ organs, i.e. those which grow inclined to the main axis. 1951McLean & Ivimey-Cook Textbk. Theoret. Bot. I. xxi. 837 Bilateral and dorsiventral organs are mostly plagiotropic, that is, horizontal or inclined in position. |