| 词汇 | nucellus |
| 释义 | BETA Examples of nucellusnucellus isn’t in the Cambridge Dictionary yet. You can help! After fertilization, the nucellus may develop into the perisperm that feeds the embryo. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The integuments do not enclose the nucellus completely but retain an opening at the apex referred to as the micropyle. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, they fall short of being seeds, since the nucellus, an inner spore-covering layer, does not completely enclose the spore. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The remnants of the megasporangium tissue (the nucellus) surround the megagametophyte. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is fused to the nucellus (central portion of the ovule) only at the base. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The apical part of the nucellus has a lagensotome-like projection, which breaks down to form the pollen chamber. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is the tissue where the integuments and nucellus are joined. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Located opposite from the micropyle is the chalaza where the nucellus is joined to the integuments. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. He describes the standard arrangement in angiospermsthe nucellus joined by the chalaza to the integuments, which surround the nucellus except at the micropyle, through which the pollen tubes enter. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The nucellus is uniseriate, contains a thin-walled seed megaspore, and appears to be connected to the integument towards the chalaza only. The nucellus is 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. In nucellar embryony, the embryo is formed from the diploid nucellus tissue surrounding the embryo sac. From Wikipedia This 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 the nucellus. From Wikipedia This 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 the nucellus. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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