What is the Difference Between Exine and Intine?

The main difference between exine and intine is their location and composition within a pollen grain. A pollen grain is a male gametophyte responsible for plant reproduction. It consists of two main layers: the exine and the intine.

Exine:

• The outermost layer of the pollen grain.
• Composed of sporopollenin, a highly resistant polymer made up of phenolics, carotenoids, phenylpropanoids, and fatty acids.
• Functions as a protective layer for the pollen grain, safeguarding the reproductive cells inside from injury or harsh environmental conditions.

Intine:

• The inner layer of the pollen grain, located next to the exine.
• Composed of pectin and cellulose.
• Plays a crucial role in the maturation of pollen grain and germination of the pollen tube.

In summary, exine is the outer, protective layer of a pollen grain, while intine is the inner layer that helps in the development and germination of the pollen grain.

Comparative Table: Exine vs Intine

The main difference between exine and intine is their location and composition within a pollen grain. Here is a table summarizing their differences:

Exine is the outermost layer of the pollen grain, made up of sporopollenin, which is a highly resistant polymer that protects the reproductive cells inside from injury or harsh environmental conditions. On the other hand, intine is the inner layer of the pollen grain, made up of pectin and cellulose, and it plays a crucial role in the maturation of pollen grain and germination of the pollen tube.