| 释义 |
‖ oogonium Bot.|əʊəʊˈgəʊnɪəm|
Also rarely in anglicized form oogone. Pl. oogonia.
[mod.L., dim. of Gr. *ᾠογόνος egg-layer (cf. ὠογονία laying of eggs).]
1. The female reproductive organ in the Thallophytes or lower Cryptogams, usually a rounded cell or sac containing one or more oospheres.
Usually distinguished from the flask-shaped archegonium of the higher Cryptogams, but sometimes including this.
1867Hogg Microsc. ii. i. 293 Organs similar to those long since discovered by Tulasne in Peronospora, which have been called Oogonia. 1874Cooke Fungi 170 Here, as in the Algæ, the spermatozoids introduce themselves into the cavity of the oogonium, and unite with the gonospheres. 1885Klein Micro-Org. 146 At the end of a mycelial thread a cell grows up into a spherical large ball, the oogonium.
2. Biol. [coined in Ger. as ovogonium (T. Boveri 1892, in Anat. Hefte Abt. II. I. 446): see ovo-.] A primordial female reproductive cell that gives rise to primary oocytes by mitosis.
1895Jrnl. R. Microsc. Soc. 511 The oogonia show a nucleus with few chromatin fragments and a very delicate, but dense linin-framework. 1920L. Doncaster Introd. Study Cytol. v. 61 After a number of divisions..the spermatogonia and oogonia cease to divide and begin to increase considerably in size. At this stage they are called primary spermatocytes..and oocytes. 1940G. A. Baitsell Human Biol. xii. 319 The immature egg or oögonium. 1970Ambrose & Easty Cell Biol. x. 330 In the female the oögonia, corresponding to spermatogonia, give rise to oöcytes. |