Question

What are the two types of pollen nuclear number? Of pollen storage product?

   What are the two types of pollen nuclear number? Of pollen storage product?

Plant Systematics

Plant Systematics

Michael G. Simpson 2nd Edition

Chapter 12, Problem 2

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Haploid refers to the condition where the pollen grains have a single set of chromosomes, which is half the number of chromosomes found in the cells of the plant's body. This is the result of meiosis, a process that reduces the chromosome number in the pollen Show more…

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What are the two types of pollen nuclear number? Of pollen storage product?

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Key Concepts

Trinucleate Pollen

This concept describes pollen grains that are released bearing three nuclei—one vegetative nucleus and two sperm nuclei. In these pollen grains, the generative nucleus has already undergone mitotic division before dispersal. This type is found in many advanced flowering plants and is linked with different timing in gamete formation relative to pollination.

Binucleate Pollen

This concept refers to pollen grains that are discharged with two nuclei. Typically, these grains contain a vegetative nucleus and a generative nucleus; the generative nucleus later divides to form two sperm cells during pollen tube growth. The distinction is important in plant reproductive biology since binucleate pollen indicates that mitosis of the generative nucleus occurs after pollination.

Pollen Storage Products

This concept deals with the endogenous reserve materials stored within pollen grains that support the early stages of pollen tube growth and fertilization. The main types of storage products include carbohydrates, typically in the form of starch, and lipids. These reserves provide the energy and structural components necessary for successful germination and embryo development.

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