micropyle

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Related to micropyle: embryo sac, synergid, antipodal cells

mi·cro·pyle

(mī′krə-pīl′)

1. Botany A minute opening in the ovule of a seed plant through which the pollen tube usually enters.

2. Zoology A pore in the membrane covering the ovum of some animals through which a spermatozoon can enter.

[micro- + Greek pulē, gate.]

mi′cro·py′lar adj.

micropyle

(ˈmaɪkrəʊˌpaɪl)

1. (Botany) a small opening in the integuments of a plant ovule through which the male gametes pass

2. (Zoology) a small pore in the shell of an insect's eggs through which the sperm passes

[C19: from micro- + Greek pulē gate]

ˌmicroˈpylar adj

mi•cro•pyle

(ˈmaɪ krəˌpaɪl)

n.

1. the surface of the membrane through which sperm is transported to the ovum in fertilization.

2. the opening in a seed plant ovule through which the pollen tube reaches the embryo.

[1815–25; micro- + Greek pýlē gate]

mi`cro•py′lar, adj.

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Noun

micropyle - minute opening in the wall of an ovule through which the pollen tube enters

aperture - a natural opening in something

ovule - a small body that contains the female germ cell of a plant; develops into a seed after fertilization

References in periodicals archive ?

Morphologically, the oocysts are spherical to ovoid and do not present a micropyle.

Prevalence of Caryospora Species (Apicomplexa: Eimeriidae) in Falcons in the United Arab Emirates

Micropyle recorded in the full-grown oocytes (Figure3I).

Ovarian histology and fecundity in the evaluation of the reproduction of the invasive species Serrasalmus marginatus (Characidae) on a neotropical floodplain/Histologia ovariana e fecundidade na avaliacao da reproducao da especie invasora Serrasalmus marginatus (Characidae) em uma planicie de inundacao neotropical

The cubic cells synthesize proteins which are important for the micropyle region whereas prismatic cells are involved in the secretion of substances related to the eggs adhesiveness (Rizzo et al.

Morfologia comparativa de las gonadas de seis especies de peces de la familia Anostomidae (Characiformes: Anostomidae)

A teleost egg is covered with a thick envelope called a chorion, which has a narrow pore designated as a micropyle that helps to avoid polyspermy [15].

Features of Sperm Motility and Circadian Rhythm in Japanese Anchovy (Engraulis japonicus)

Spermatozoa must cross some of the freshly secreted jelly to reach the micropyle of the egg for successful fertilization (von Boletzky 1989).

Egg masses of flying squids (cephalopoda: ommastrephidae)

Identification was based on the morphological features of the oocyst and sporocysts (size, shape and presence or absence of a micropyle or polar cap or oocyst residuum) under the 100 x objective, with the aid of taxonomic keys (Soulsby, 1968; Pellerdy, 1974; Levine, 1985; Coudert, 1992).

Coproscopic Study on Enteric Protozoan Parasites of Goats (Capra hircus L., 1758) in Upper Egypt

The parenchyma cells beneath the epidermis of the ovule in the micropyle end developed into an archesporial cell in late April (Fig.

Microsporogenesis, Megasporogensis and Male and Female Gametophyte Development in Feijoa sellowiana (Myrtaceae)

The micropyle is formed by the two integuments delimiting a narrow opening that is occluded by the nucellar beak (see Figure 4F).

Floral morphology and anatomy of Dalechampia alata Klotzsch ex Baill

Eggs had a 3-leaved micropyle and highly sculptured chorion surface, typical of Lycaenidae (Fig.

New and revised life history of the Florida hairstreak Eumaeus atala (Lepidoptera: Lycaenidae) with notes on its current conservation status

Specific cells, located near the micropyle and functioning as a valve, permit the seeds to dehydrate and enter into equilibrium in a dry environment, and do not allow the absorption of water under humid conditions (BLACK et al.

Physiological immaturity and hydropriming of Parkia nitida miq. seeds with physical dormancy/ Imaturidade fisiologica e condicionamento hidrico de sementes de Parkia nitida miq com dormencia fisica

The ovule is anatropous, presenting micropyle, funicle, inner and outer integument and nucellus in both floral types.

Dioecia funcional y polinizacion por polillas en cabralea canjerana subsp. canjerana (Meliaceae)

The pollen tube enters the opening of the ovule, the micropyle, and reaches the interior of the ovule to undergo spenn release and fertilization (Endress, 1996).