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micropyle

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卵孔; 珠孔

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卵孔; 珠孔

WordNet (r) 3.0 (2006) (WordNet)

micropyle
n 1: minute opening in the wall of an ovule through which the
pollen tube enters

The Collaborative International Dictionary of English v.0.48 (gcide)

Micropyle \Mi"cro*pyle\, n. [Micro- Gr. ? gate, orifice: cf.
F. micropyle.] (Biol.)
(a) An opening in the membranes surrounding the ovum, by
which nutrition is assisted and the entrance of the
spermatozoa permitted.
(b) An opening in the outer coat of a seed, through which the
fecundating pollen enters the ovule. -- {Mi*crop"y*lar},
a.
[1913 Webster]

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Micropyle | plant anatomy | Britannica
…tissues, through an opening (micropyle) of the egg, and enters a cell near the micropyle (synergid), in which the two male gametes are discharged The unique feature of this phase of angiosperm development is that two fertilizations occur
Micropyle - an overview | ScienceDirect Topics
The micropyle is the pore or canal within one or more integuments through which (in angiosperms) a pollen tube traverses prior to fertilization (In nonangiospermous seed plants, the micropyle receives pollen grains directly )
Micropyle - Wikipedia
Micropyle (botany) a minute opening in the integument of an ovule of a seed plant
MICROPYLE Definition Meaning - Merriam-Webster
The meaning of MICROPYLE is a minute opening in the integument of an ovule of a seed plant
4. 6. 3: Mature Embryos and Seed Structure - Biology LibreTexts
The micropyle is a small round structure next to the hilum where the pollen tube entered Figure 4 6 3 1: The external structures of a bean seed, an example of a eudicot (7X) The seed coat surrounds the seed There is a round micropyle, where the pollen tube originally entered the ovule
Micropyle (zoology) - Wikipedia
A micropyle is a pore in the membrane covering the ovum, through which a sperm enters Micropyles are also found in sporozoites of some digenetic microorganisms such as Plasmodium at the anterior part of the cell that ultimately leads towards the apical cap
Micropyles: The Tiny Gates in Plant Ovules and Their Role in . . .
The micropyle is located at the chalazal end of the ovule, opposite the funiculus, which connects the ovule to the placenta Its size, shape, and position can vary significantly between different plant species, influencing their reproductive success
micropyle - Encyclopedia. com
micropyle (adj micropylar) A pore in the egg membrane of an insect oocyte, which allows sperm to enter and fertilize the egg
What does micropyle mean? - Definitions. net
A micropyle is a small opening or pore in the outer covering of a plant ovule or a seed, through which a sperm cell can access the egg for fertilization In fish and insect eggs, it is a tiny opening allowing the sperm to enter and fertilize the egg
Micropyle | insect anatomy | Britannica
In some groups the micropyle is at the side, whereas in others it is on the surface away from the substrate The egg passes along the individual oviduct and through the common oviduct to the vagina

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