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单词 nucellus
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Examples ofnucellus

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After fertilization, thenucellusmay develop into the perisperm that feeds the embryo.
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The integuments do not enclose thenucelluscompletely but retain an opening at the apex referred to as the micropyle.
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However, they fall short of being seeds, since thenucellus, an inner spore-covering layer, does not completely enclose the spore.
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The remnants of the megasporangium tissue (thenucellus) surround the megagametophyte.
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It is fused to thenucellus(central portion of the ovule) only at the base.
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The apical part of thenucellushas a lagensotome-like projection, which breaks down to form the pollen chamber.
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It is the tissue where the integuments andnucellusare joined.
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Located opposite from the micropyle is the chalaza where thenucellusis joined to the integuments.
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He describes the standard arrangement in angiospermsthenucellusjoined by the chalaza to the integuments, which surround the nucellus except at the micropyle, through which the pollen tubes enter.
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Thenucellusis uniseriate, contains a thin-walled seed megaspore, and appears to be connected to the integument towards the chalaza only.
From theCambridge English Corpus
Thenucellusis poorly preserved but appears uniseriate, and is attached to the integument only at its base, and contains a thin-walled megaspore that lacks developed megagametophyte tissues.
From theCambridge English Corpus
In nucellar embryony, the embryo is formed from the diploidnucellustissue surrounding the embryo sac.
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In gymnosperms, three of the four haploid spores produced in meiosis typically degenerate, leaving one surviving megaspore inside thenucellus.
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As with all seed-plants, the lyginopteridalean ovules had just one functional seed megaspore within thenucellus.
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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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更新时间：2025/2/10 20:55:59