Intine

Definition

The intine is the inner layer of the pollen grain wall, composed primarily of cellulose and pectin. It plays a crucial role in the protection and germination of pollen grains during fertilization.

5 Must Know Facts For Your Next Test

1. The intine is located beneath the exine, which is the outer layer of the pollen grain wall.
2. It is primarily made up of cellulose and pectin, providing structural support to the pollen grain.
3. During pollen germination, the intine expands to form the pollen tube that facilitates fertilization.
4. Intine structure can vary between different plant species, influencing pollen viability and compatibility.
5. Damage or defects in the intine can hinder successful fertilization by affecting pollen tube formation.

Review Questions

Related terms

exine:

The outer layer of the pollen grain wall, known for its tough and resistant structure.

pollen tube:

A tubular structure produced by germinating pollen grains that allows sperm cells to reach and fertilize an ovule.

cellulose:

A complex carbohydrate that forms a major component of plant cell walls and provides structural support.