plagiotropicadj.

Brit.

/ˌpleɪdʒɪəˈtrɒpɪk/,

/ˌpleɪdʒɪəˈtrəʊpɪk/, U.S.

/ˌpleɪdʒiəˈtrɑpɪk/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: plagio- comb. form, -tropic comb. form.

Etymology: < plagio- comb. form + -tropic comb. form, after German plagiotrop (J. von Sachs 1882, in Arbeiten Bot. Inst. Würzburg 1879 2 226). N.E.D.(1907) gives only the pronunciation (plēⁱdʒioˌtrǫ·pik) /pleɪdʒɪəʊˈtrɒpɪk/.

Botany.

Designating or relating to a plant part or organ that tends to take up an oblique or horizontal position with relation to the main axis, usually because its own parts react differently to the influence of external stimuli (such as light, gravity, etc.). Contrasted with orthotropic.

ΘΚΠ

the world > plants > part of plant > growth, movement, or curvature of parts > [adjective] > undergoing tropism

geotropic1875

heliotropic1875

paratonic1875

apheliotropic1880

apogeotropic1880

nyctitropic1880

paraheliotropic1880

plagiotropic1882

phototropic1883

selenotropic1883

rheotropic1884

orthotropic1885

thermotropic1885

haptotropic1888

traumatropic1898

plagiotropous1900

aphototropic1903

orthotropous1909

1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 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.

1906 Westm. Gaz. 30 July 2/1 Organs which have their long axes vertical are called orthotropic, and to them are opposed plagiotropic organs.

1929 T. Thomson tr. M. Büsgen 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.

1951 R. C. McLean & W. R. Ivimey-Cook Textbk. Theoret. Bot. I. xxi. 837 Bilateral and dorsiventral organs are mostly plagiotropic, that is, horizontal or inclined in position.

1992 M. Ingrouille Diversity & Evol. Land Plants 41 Plagiotropic shoots act primarily to occupy light space.

Derivatives

plagioˈtropically adv.

ΚΠ

1888 Science 21 Dec. 306/1 Dorsiventral structures act plagiotropically (tending to place their axes obliquely or transverse to the direction of the acting force).

1998 Amer. Jrnl. Bot. 85 1201/2 The temporary axial system of plagiotropically oriented compound leaves acts as a replacement for the ‘missing’ branch system.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	plagiotropic
释义	plagiotropicadj. Brit. /ˌpleɪdʒɪəˈtrɒpɪk/, /ˌpleɪdʒɪəˈtrəʊpɪk/, U.S. /ˌpleɪdʒiəˈtrɑpɪk/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: plagio- comb. form, -tropic comb. form. Etymology: < plagio- comb. form + -tropic comb. form, after German plagiotrop (J. von Sachs 1882, in Arbeiten Bot. Inst. Würzburg 1879 2 226). N.E.D.(1907) gives only the pronunciation (plēⁱdʒioˌtrǫ·pik) /pleɪdʒɪəʊˈtrɒpɪk/. Botany. Designating or relating to a plant part or organ that tends to take up an oblique or horizontal position with relation to the main axis, usually because its own parts react differently to the influence of external stimuli (such as light, gravity, etc.). Contrasted with orthotropic. ΘΚΠ the world > plants > part of plant > growth, movement, or curvature of parts > [adjective] > undergoing tropism geotropic1875 heliotropic1875 paratonic1875 apheliotropic1880 apogeotropic1880 nyctitropic1880 paraheliotropic1880 plagiotropic1882 phototropic1883 selenotropic1883 rheotropic1884 orthotropic1885 thermotropic1885 haptotropic1888 traumatropic1898 plagiotropous1900 aphototropic1903 orthotropous1909 1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 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. 1906 Westm. Gaz. 30 July 2/1 Organs which have their long axes vertical are called orthotropic, and to them are opposed plagiotropic organs. 1929 T. Thomson tr. M. Büsgen 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. 1951 R. C. McLean & W. R. Ivimey-Cook Textbk. Theoret. Bot. I. xxi. 837 Bilateral and dorsiventral organs are mostly plagiotropic, that is, horizontal or inclined in position. 1992 M. Ingrouille Diversity & Evol. Land Plants 41 Plagiotropic shoots act primarily to occupy light space. Derivatives plagioˈtropically adv. ΚΠ 1888 Science 21 Dec. 306/1 Dorsiventral structures act plagiotropically (tending to place their axes obliquely or transverse to the direction of the acting force). 1998 Amer. Jrnl. Bot. 85 1201/2 The temporary axial system of plagiotropically oriented compound leaves acts as a replacement for the ‘missing’ branch system. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < adj.1882
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