This opening is called the “micropyle,” and allows the pollen tube to enter.
When the pollen grain germinates, the nuclei enter the threadlike growth (this growth is called the pollen tube; see Figure).
Each ovule, which is reached by a pollen tube, swells up and becomes a seed.
It is believed that some chemical influence thus attracts the pollen tube.
And he observed the extension of the embryo-sacs up the style and the union of the pollen tube with the tip of the embryo-sac.
Find there the little hole through which the pollen tube reached the embryo sac.
I spent pretty well the whole day over them, and got three, and several in the pollen tube, not yet quite ripe.
This embryo is the product of fertilization of a germinal vesicle by a pollen tube.
Pollen was assumed to have germinated if the length of the pollen tube exceeded the diameter of the pollen grain.
|pollen tube |
The slender tube that is formed after pollination by division of the tube cell in a pollen grain. The pollen tube penetrates the ovule and releases the male gametes.