| 单词 |
propagule |
| 释义 |
propagule Bot.|prəʊˈpægjʊl|
[ad. mod.L. propāgul-um, dim. of L. propāgo a shoot laid down in layering, a runner.]
1. See quot. rare.
1858Mayne Expos. Lex., Propagulum, Bot. Applied by Willdenow to the round corpuscles which are solitary or agglomerated upon the surface of the thallus of the Lichenes: a propagule.
2. A seed, spore, or other product of a plant which is disseminated to form a new individual; also, occasionally used as a name for the products of asexual reproduction in certain lower animals. Hence proˈpagular a., of or pertaining to a propagule.
1905F. E. Clements Res. Methods Ecol. iv. 241 Dormant seeds and propagules are abundant. 1959New Biol. XXVIII. 80 Extrinsic barriers between breeding populations..effectively prevent or check gene flow because they are not crossed by adults, or by seeds, pollen, or other ‘propagules’. 1965Bell & Coombe tr. Strasburger's Textbk. Bot. 204 Propagules may consist of single cells (spores), groups of cells (gemmae), or entire organs or complexes of organs (bulbils). 1967Oceanogr. & Marine Biol. V. 494 Several hydroids are particularly adapted..to ensure asexual reproduction by means of propagular stolons whose brittle and curved extremities can catch a neighbouring leaf. 1969New Scientist 20 Nov. 402/1 Any fungal propagules landing on its surface will be killed. 1974New Phytologist LXXIII. 981 Wallace pointed out that the small propagules of Compositae..allowed that family to gain an early footing on islands. 1977Nature 3 Nov. 48/2, I report here that the marine red alga Centroceras produces missile-shaped propagules which are carried away by ocean currents. |
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