The latter ultimately divides in the apex of the pollen-tube into two non-motile generative cells.
The pollen-tube is constant because it has proved to be indispensable.
The branches of the stigma are very thin, formed apparently of three rows of cells of hardly greater diameter than pollen-tube.
It is down these style-branches that the pollen-tube passes on its way to the ovules or embryo seeds.
The male-cells are carried to their destination in the tip of the pollen-tube.
The pollen-tube does not penetrate the ovule through the micropyle but enters at the opposite end—the chalaza.
The pollen-tube must penetrate the whole length of each thread of corn-silk in order to reach the ovules.
|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.