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The Angiosperm Life Cycle

The Angiosperm Life Cycle

Plants have a life cycle split between two multicellular stages: a haploid stage—with cells containing one set of chromosomes—and a diploid stage—with cells containing two sets of chromosomes. The haploid stage is the gamete-producing gametophyte, and the diploid stage is the spore-producing sporophyte.

Epigenetic Regulation

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...

Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

Morphogenesis

Morphogenesis

Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.

Seed Structure and Early Development of the Sporophyte

Seed Structure and Early Development of the Sporophyte

Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.

Genomic Imprinting and Inheritance

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...

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Epigenetic Modifications during Angiosperm Gametogenesis.

Zoë Migicovsky¹, Igor Kovalchuk

¹Department of Biological Sciences, University of Lethbridge Lethbridge, AB, Canada.

Frontiers in Plant Science

|May 31, 2012

Summary

This summary is machine-generated.

Angiosperm gametes use DNA methylation and histone modifications for epigenetic control. This process silences transposable elements (TEs) and differentiates cells, ensuring proper development after fertilization.

Keywords:

DNA methylation epigenetic modifications genomic imprinting histone modifications plant gametogenesis transposon reactivation

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Area of Science:

Plant reproductive biology
Epigenetics
Molecular genetics

Background:

Angiosperms lack a distinct germline, forming gametes from gametophyte initials.
Gametogenesis involves DNA methylation and histone modifications, crucial epigenetic regulatory mechanisms.
Transposable elements (TEs) are mobile genetic elements that require epigenetic control.

Purpose of the Study:

To investigate the role of DNA methylation and histone modifications in angiosperm gametogenesis.
To understand how epigenetic mechanisms regulate transposable element (TE) expression during gamete formation.
To explore the potential differentiation roles of histone variants in female gametes.

Main Methods:

Analysis of DNA methylation patterns in vegetative nucleus (VN) and central cell nuclei (CCN).
Investigation of small interfering RNA (siRNA) production and transport.
Examination of histone variant accumulation, specifically HTR10, in mature sperm and female gametes.

Main Results:

DNA demethylation in VN and CCN leads to transposable element (TE) expression.
siRNAs produced in response to TE expression may move to sperm and egg cells (EC) to enforce silencing.
Histone variant HTR10 accumulates in mature sperm and is replaced post-fertilization.
Distinct histone isoforms are present in female EC and CCN, suggesting a role in differentiation.

Conclusions:

Epigenetic modifications, including DNA demethylation and histone changes, are vital for angiosperm gametogenesis.
The siRNA pathway plays a role in silencing TEs during gamete development.
Histone variations contribute to the differentiation of female gametic components.