Micropyle

This opening is called the "micropyle," and allows the pollen tube to enter. ❋ Douglas Houghton Campbell (N/A)

* (* Little as a name may actually affect the facts, we ought certainly to confine the name "micropyle" to canals of the egg-membrane, which serve for the entrance of the semen. ❋ Fritz Muller (1859)

The receptive part of the gymnosperm ovule is called the micropyle. ❋ Wikipedia (2009)

For small quantities of seed, cut through the seedcoat opposite the micropyle, or pointed-end of the seed, taking care not to damage the seed embryo. ❋ Unknown (1996)

The seed should be sown 1-2 cm deep with the micropyle pointing downwards; the emerging root is not strongly geotropic and may come up out of the soil if the seed is planted upside down. ❋ Unknown (1996)

To avoid damaging the seed embryo, cut or scrape the seedcoat opposite the micropyle. ❋ Unknown (1996)

A varying number of transverse segment-walls transform it into a pro-embryo -- a cellular row of which the cell nearest the micropyle becomes attached to the apex of the embryo-sac, and thus fixes the position of the developing embryo, while the terminal cell is projected into its cavity. ❋ Various (N/A)

The development of the ovule, which represents the macrosporangium, is very similar to the process in Gymnosperms; when mature it consists of one or two coats surrounding the central nucellus, except at the apex where an opening, the micropyle, is left. ❋ Various (N/A)

-- _A_, ripe ovule of _Monotropa uniflora_, in optical section, × 100. _m_, micropyle. _e_, embryo sac. ❋ Douglas Houghton Campbell (N/A)

Such a method of entrance is styled chalazogamic, in contrast to the porogamic or ordinary method of approach by means of the micropyle. ❋ Various (N/A)

Then when it lies on the stigma it develops a long tube, which passes down the style and through the micropyle of the ovule to the germinal vesicles, one of which is fertilized by what is probably an osmotic transference of nuclear matter. ❋ Various (N/A)

The fertilized egg cell first secretes a membrane, and then divides into a row of cells (_N_) of which the one nearest the micropyle is often much enlarged. ❋ Douglas Houghton Campbell (N/A)

Amici's subsequent (1846) discovery of the entrance of the pollen-tube into the micropyle, fertilizing the female cell which then develops into the embryo. ❋ Various (N/A)

Fertilization: takes place when a spermatozoön enters through the micropyle of an ovum and unites with the cell nucleus: loosely applied like copulation or to its completion. ❋ John. B. Smith (N/A)

In _Casuarina_, _Juglans_ and the order Corylaceae, the pollen-tube does not enter by means of the micropyle, but passing down the ovary wall and through the placenta, enters at the chalazal end of the ovule. ❋ Various (N/A)

At the period of fertilization the embryo-sac lies in close proximity to the opening of the micropyle, into which the pollen-tube has penetrated, the separating cell-wall becomes absorbed, and the male or sperm-cells are ejected into the embryo-sac. ❋ Various (N/A)

The primary root of the embryo in all Angiosperms points towards the micropyle. ❋ Various (N/A)