| 释义 |
ectotrophic, a. Bot.|ˈɛktəʊtrɒfɪk|
[ad. G. ectotrophisch (A. B. Frank Lehrb. d. Pflanzenphysiologie (1890) II. 135), f. ecto- + trophic a.]
Chiefly of Mycorrhiza: forming a tissue on the surface of roots. Opp. to endotrophic a.
1899[see endotrophic a.]. [ 1903H. C. Porter tr. Strasburger's Text-bk. Bot. (ed. 2) i. ii. 209 The fungal hyphæ are sometimes present..within the cells... In other cases the fungus surrounds the young roots with a dense investment of interwoven hyphæ. The former arrangement is spoken of as endotrophic, the latter as exotrophic [later edd. ectotrophic] mycorhiza. ]1926Tansley & Chipp Study of Vegetation ix. 158 Ectotrophic [fungi]..are found..mainly as a mantle around the rootlets of trees. 1938Weaver & Clements Plant Ecology (ed. 2) xi. 329 If the fungal mycelium occurs on the outside of the root and between its cells..the mycorrhiza is ectotrophic (i.e., nourished outside). 1959New Scientist 24 Sept. 528/2 The well-defined ectotrophic mycorrhizas of certain forest trees, and the more variable endotrophic condition of the majority of plants. |