英语词汇“coleoptile”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

　

单词	coleoptile
释义	coleoptile co·le·op·tile C0473600 (kō′lē-ŏp′tĭl, kŏl′ē-)n. A protective sheath enclosing the shoot tip and embryonic leaves of grasses. [From New Latin coleoptilum : Greek koleon, sheath; see kel- in Indo-European roots + Greek ptilon, plume; see pet- in Indo-European roots.] coleoptile (ˌkɒlɪˈɒptaɪl) n (Botany) a protective sheath around the plumule in grasses[C19: from New Latin coleoptilum, from Greek koleon sheath + ptilon down, soft plumage] co•le•op•tile (ˌkoʊ liˈɒp tɪl, ˌkɒl i-) n. (in grasses) the first leaf above the ground, forming a sheath around the stem tip. [1865–70; < New Latin coleoptilum < Greek koleó(n) sheath + ptílon soft feathers] Translations колеоптиль Coleoptile coleoptile [‚kō·lē′äp·təl] (botany) The first leaf of a monocotyledon seedling. Coleoptile the 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. coleoptile coleoptile a 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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更新时间：2025/3/16 22:06:19