coleoptile
co·le·op·tile
C0473600 (kō′lē-ŏp′tĭl, kŏl′ē-)coleoptile
(ˌkɒlɪˈɒptaɪl)co•le•op•tile
(ˌkoʊ liˈɒp tɪl, ˌkɒl i-)n.
| 单词 | coleoptile |
| 释义 | coleoptileco·le·op·tileC0473600 (kō′lē-ŏp′tĭl, kŏl′ē-)coleoptile(ˌkɒlɪˈɒptaɪl)co•le•op•tile(ˌkoʊ liˈɒp tɪl, ˌkɒl i-)n. Coleoptilecoleoptile[‚kō·lē′äp·təl]Coleoptilethe first leaf of cereal grasses, which has no blade and consists of a closed tubule. It is colorless, green, or reddish. The coleoptile encloses and protects the young sprout, the plumule, and the growing point of the stem. It penetrates the soil with its hard apex, which then ruptures; causing the grain to sprout. A new leaf emerges from the top of the coleoptile. The coleoptile, which subsequently dries up, apparently is the middle part of the cotyledon. coleoptilecoleoptilea nonchlorophyllous protective covering over the growing shoot (PLUMULE) of young plant seedlings in certain MONOCOTYLEDONS (e.g. oats) that is the first structure to break through the soil into the air after germination. As growth proceeds the coleoptile is ruptured by the first foliage leaf of the enclosed shoot. Oat coleoptiles have been used extensively in experiments with AUXINS. |
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