megagametophyten.

Brit.

/ˌmɛɡəɡəˈmiːtə(ʊ)fʌɪt/,

/ˌmɛɡəˈɡamᵻtəfʌɪt/, U.S.

/ˌmɛɡəɡəˈmidəˌfaɪt/

Origin: Formed within English, by compounding. Etymons: mega- comb. form, gametophyte n.

Etymology: < mega- comb. form + gametophyte n.. Compare earlier microgametophyte n., macrogametophyte n.

Botany.

A gametophyte that develops from a megaspore; a female gametophyte.

ΘΚΠ

the world > plants > part of plant > reproductive part(s) > spore or sporule > cryptogam or plant having spores > [noun] > types of

acrogen1834

endophyte1835

oophore1875

zygophyte1885

oophyte1886

microgametophyte1907

megagametophyte1915

macrogametophyte1931

1915 Ann. Missouri Bot. Garden 2 111 Here we set off those plants in which both generations are mostly holophytic and independent of one another, the megagametophyte still containing chlorophyll.

1933 Amer. Jrnl. Bot. 20 217 (heading) Morphology of the megagametophyte and the embryo sporophyte of Isoetes lithophila.

1957 Encycl. Brit. XI. 25/2 As the megagametophyte enlarges, the nucellar tissue between the exposed ends of the pollen tubes and the megagametophyte breaks down completely.

1964 H. J. Dittmer Phylogeny & Form in Plant Kingdom xxi. 487 A single megagametophyte may contain several archegonia with ripe eggs.

1989 Nature 16 Feb. 645/2 Among the 34 seeds present in the Hamilton cone there are cellular megagametophytes in six, and well developed embryos..in four.

Derivatives

megagametoˈphytic adj.

ΚΠ

1929 Amer. Jrnl. Bot. 16 596 I have..invariably found 7n chromosomes in megagametophytic nuclei.

1950 Bot. Gaz. 111 225/1 Excised embryos grown without light on a medium composed of autoclaved megagametophytic tissue and agar developed no chlorophyll.

1993 Plant Molecular Biol. 21 709 A cDNA library was made from poly(A)⁺ RNA isolated from developing Douglas fir (Pseudotsuga menziesii) embryo and megagametophytic tissue.

This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022).

单词	megagametophyte
释义	megagametophyten. Brit. /ˌmɛɡəɡəˈmiːtə(ʊ)fʌɪt/, /ˌmɛɡəˈɡamᵻtəfʌɪt/, U.S. /ˌmɛɡəɡəˈmidəˌfaɪt/ Origin: Formed within English, by compounding. Etymons: mega- comb. form, gametophyte n. Etymology: < mega- comb. form + gametophyte n.. Compare earlier microgametophyte n., macrogametophyte n. Botany. A gametophyte that develops from a megaspore; a female gametophyte. ΘΚΠ the world > plants > part of plant > reproductive part(s) > spore or sporule > cryptogam or plant having spores > [noun] > types of acrogen1834 endophyte1835 oophore1875 zygophyte1885 oophyte1886 microgametophyte1907 megagametophyte1915 macrogametophyte1931 1915 Ann. Missouri Bot. Garden 2 111 Here we set off those plants in which both generations are mostly holophytic and independent of one another, the megagametophyte still containing chlorophyll. 1933 Amer. Jrnl. Bot. 20 217 (heading) Morphology of the megagametophyte and the embryo sporophyte of Isoetes lithophila. 1957 Encycl. Brit. XI. 25/2 As the megagametophyte enlarges, the nucellar tissue between the exposed ends of the pollen tubes and the megagametophyte breaks down completely. 1964 H. J. Dittmer Phylogeny & Form in Plant Kingdom xxi. 487 A single megagametophyte may contain several archegonia with ripe eggs. 1989 Nature 16 Feb. 645/2 Among the 34 seeds present in the Hamilton cone there are cellular megagametophytes in six, and well developed embryos..in four. Derivatives megagametoˈphytic adj. ΚΠ 1929 Amer. Jrnl. Bot. 16 596 I have..invariably found 7n chromosomes in megagametophytic nuclei. 1950 Bot. Gaz. 111 225/1 Excised embryos grown without light on a medium composed of autoclaved megagametophytic tissue and agar developed no chlorophyll. 1993 Plant Molecular Biol. 21 709 A cDNA library was made from poly(A)⁺ RNA isolated from developing Douglas fir (Pseudotsuga menziesii) embryo and megagametophytic tissue. This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022). < n.1915
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