单词 nucellus 释义 BETA

Examples ofnucellus

Dictionary> Examples ofnucellusnucellusisn’t in the Cambridge Dictionary yet. You can help!Add a definitionAfter fertilization, thenucellusmay develop into the perisperm that feeds the embryo.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.The integuments do not enclose thenucelluscompletely but retain an opening at the apex referred to as the micropyle.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.However, they fall short of being seeds, since thenucellus, an inner spore-covering layer, does not completely enclose the spore.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.The remnants of the megasporangium tissue (thenucellus) surround the megagametophyte.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.It is fused to thenucellus(central portion of the ovule) only at the base.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.The apical part of thenucellushas a lagensotome-like projection, which breaks down to form the pollen chamber.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.It is the tissue where the integuments andnucellusare joined.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.Located opposite from the micropyle is the chalaza where thenucellusis joined to the integuments.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.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.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.Thenucellusis uniseriate, contains a thin-walled seed megaspore, and appears to be connected to the integument towards the chalaza only.From theCambridge English CorpusThenucellusis 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 CorpusIn nucellar embryony, the embryo is formed from the diploidnucellustissue surrounding the embryo sac.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.In gymnosperms, three of the four haploid spores produced in meiosis typically degenerate, leaving one surviving megaspore inside thenucellus.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.As with all seed-plants, the lyginopteridalean ovules had just one functional seed megaspore within thenucellus.FromWikipediaThis example is from Wikipedia and may be reused under a CC BY-SA license.

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