Question

What do nexine and sexine refer to?

    What do nexine and sexine refer to?

Plant Systematics

Plant Systematics

Michael G. Simpson 2nd Edition

Chapter 12, Problem 16

Instant Answer

Solved by Expert Asma Venkitta

06/21/2021

Step 1

Nexine refers to the outer layer of the pollen grain wall. It is composed of a tough and resistant material that helps protect the pollen grain during its dispersal and ensures its survival. The nexine is often sculptured with various patterns and structures Show more…

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Key Concepts

Nexine

Nexine refers to the inner, typically smoother layer of the pollen wall's exine. It provides structural support and protection to the pollen grain and is composed of robust materials that help maintain pollen integrity during its journey from the anther to the stigma.

Sexine

Sexine denotes the outer, often intricately sculptured layer of the pollen wall's exine. This layer exhibits distinctive patterns that can be species-specific, aiding in the recognition and interaction with pollinators, and plays a critical role in the adhesion and dispersal mechanisms associated with successful plant fertilization.

Pollen Wall Structure

The pollen wall is a complex, multi-layered structure designed to safeguard the pollen grain. It typically comprises the exine, which is subdivided into inner layers like the nexine and outer layers like the sexine, and the inner intine layer. Together, these layers contribute to the protective, functional, and interactive properties crucial for plant reproduction.

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