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

embryo sac n. [after German Embryosack (1835 in the source translated in quot. 1837), itself after French sac embryonnaire (1827 or earlier)] Botany a structure within which a plant embryo develops; spec. (in an angiosperm) a thin-walled sac inside the nucellus of the ovule within which fertilization occurs and which becomes the female gametophyte, containing the zygote and the endosperm nucleus.

ΘΚΠ

the world > plants > part of plant > reproductive part(s) > seed > [noun] > parts of > embryo-sac

embryo sac1837

macrospore1855

megaspore1857

1837 A. Gray tr. A. J. C. Corda in Amer. Jrnl. Sci. 31 321 The connexion of the pollen-tubes with the embryo-sac [Ger. Embryosack] continues for some time after impregnation.

1859 T. Moore Nature-printed Brit. Ferns I. iii. 32 They [sc. the archegonia of a fern] are formed near the centre of the prothallus and at first consist of a single cell..destined to become an embryo-sac.

1936 W. Stiles Introd. Princ. Plant Physiol. xviii. 408 Sterility from impotence results from the failure of either pollen or embryo-sacs to form or develop normally.

2010 D. Hillis et al. Princ. Life (2012) vii. 127/1 In flowering plants the gametophytes are very small: the male gametophyte is the pollen, and the female gametophyte is the embryo sac—a part of the flower.

单词	embryo sac
释义	> as lemmas embryo sac embryo sac n. [after German Embryosack (1835 in the source translated in quot. 1837), itself after French sac embryonnaire (1827 or earlier)] Botany a structure within which a plant embryo develops; spec. (in an angiosperm) a thin-walled sac inside the nucellus of the ovule within which fertilization occurs and which becomes the female gametophyte, containing the zygote and the endosperm nucleus. ΘΚΠ the world > plants > part of plant > reproductive part(s) > seed > [noun] > parts of > embryo-sac embryo sac1837 macrospore1855 megaspore1857 1837 A. Gray tr. A. J. C. Corda in Amer. Jrnl. Sci. 31 321 The connexion of the pollen-tubes with the embryo-sac [Ger. Embryosack] continues for some time after impregnation. 1859 T. Moore Nature-printed Brit. Ferns I. iii. 32 They [sc. the archegonia of a fern] are formed near the centre of the prothallus and at first consist of a single cell..destined to become an embryo-sac. 1936 W. Stiles Introd. Princ. Plant Physiol. xviii. 408 Sterility from impotence results from the failure of either pollen or embryo-sacs to form or develop normally. 2010 D. Hillis et al. Princ. Life (2012) vii. 127/1 In flowering plants the gametophytes are very small: the male gametophyte is the pollen, and the female gametophyte is the embryo sac—a part of the flower. extracted from embryon.adj. < as lemmas
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> as lemmas