Question

What are the two major layers of a pollen grain wall and how do they differ in chemical composition? 

   What are the two major layers of a pollen grain wall and how do they differ in chemical composition?
Plant Systematics
Plant Systematics
Michael G. Simpson 2nd Edition
Chapter 12, Problem 13 ↓

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The two major layers of a pollen grain wall are the exine and the intine.  Show more…

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What are the two major layers of a pollen grain wall and how do they differ in chemical composition?
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Key Concepts

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Intine
The intine is the inner layer of the pollen grain wall, composed mainly of pectocellulosic materials such as cellulose and pectin. This layer contrasts with the exine in both its chemical makeup and structural properties, playing a role in the interaction of the pollen with the stigma and facilitating the initial stages of pollen germination.
Exine
The exine is the outer layer of the pollen grain wall, primarily composed of a complex polymer called sporopollenin. Sporopollenin is known for its chemical resilience, making the exine highly resistant to degradation and environmental stresses. Its structure and composition are key in providing the pollen grain with physical protection and longevity.
Pollen Wall Structure
This concept involves the overall architecture of the protective barrier that surrounds the pollen grain. Understanding the structure is crucial for comprehending how different layers contribute to the grain's durability, function, and interaction with the environment.
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