| 单词 | cotyledon |
| 释义 | cotyledon noun[C] biologyspecializeduk/ˌkɒt.ɪˈliː.dən/us/ˌkɑː.t̬əˈliː.dən/atypeofleafthat ispartof thedevelopingplantinside aseedand eitherstoresfoodorgrowsfrom theseedtoproducefood 子叶（植物种子胚的叶片，可储藏营养或制造营养）Parts of plants
cotyledon| American Dictionarycotyledon noun[C] us/ˌkɑt·əlˈi·dən/biology atypeofleafthat ispartof thedevelopingplantinside aseedand that eitherstoresfoodorgrowsfrom theseedtoproducefood Examplesofcotyledoncotyledon In four instances, the testa was removed from one end of the seed and the fleshy cotyledons eaten from the centre. From theCambridge English Corpus Although cell size in the cotyledons was not significantly lower in the spaceflight material than in the ground control, the cotyledons contained substantially fewer cells. From theCambridge English Corpus During the period between radicle emergence and hook formation, relations betweencotyledonlength and the time from visible germination were linear. From theCambridge English Corpus Solubility of axis cell walls differed from solubility ofcotyledoncell walls. From theCambridge English Corpus Removal of the cotyledons strongly diminished enzymatic activity in the embryonic axis. From theCambridge English Corpus There is a concomitant increase in protein reserves which progresses in the same wave-like pattern outward from thecotyledon. From theCambridge English Corpus A seedling was considered fully established when two leaves appeared in addition to the green cotyledons. From theCambridge English Corpus Seedlings with emerged cotyledons were monitored and removed each time from the pots. From theCambridge English Corpus In cotyledons, methyl esterification ranged from 25 to 40 mole% and was 31 mole% after desiccation. From theCambridge English Corpus To facilitate equilibration, seed cotyledons were chopped into c. 1 mm3 pieces. From theCambridge English Corpus Prior to acquisition of desiccation tolerance, seeds produced seedlings with either shortened radicle tips, unexpanded hypocotyls or folded cotyledons. From theCambridge English Corpus The seeds are flattened and seedlings are phaneroepigeal with leafy cotyledons. From theCambridge English Corpus Diaspores are gravity dispersed and the seed coat rapidly decays, exposing cotyledons to the immediate environment prior to germination. From theCambridge English Corpus Rather, a stimulus released from thecotyledonis more likely to induce the major cell wall degrading enzyme, endo- mannanase, within the endosperm itself. From theCambridge English Corpus Then embryos were isolated from the endosperm and pericarp by gently pressing the seed at thecotyledonend. From theCambridge English Corpus These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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