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Updated: Jan 11, 2026

Preparation of Intact Tissue for Microscopic Analysis of the Endosperm Cell Layer in Developing and Mature Arabidopsis Seeds

Preparation of Intact Tissue for Microscopic Analysis of the Endosperm Cell Layer in Developing and Mature Arabidopsis Seeds

Published on: May 16, 2025

Shedding light on autonomous endosperm development.

Jessica da Silva Gava^1,2, Ana Paula Souza Caetano^3,4

¹Postgraduate Program in Plant Biology, Federal University of Mato Grosso, Cuiabá, Mato Grosso, Brazil.

|November 9, 2025

Summary

Seed development in Miconia species reveals a partially cellularized endosperm and a crucial nutritional role for the nucellus. This supports the evolution of autonomous apomixis in flowering plants.

Keywords:

Autonomous apomixis Gametophytic apomixis Melastomataceae Miconia Nucellus Sporophytic apomixis

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Area of Science:

Plant reproductive biology
Angiosperm embryology
Seed development

Background:

Autonomous apomixis, asexual reproduction via seeds, is significant in angiosperm evolution.
Understanding seed development in apomicts is key to understanding their reproductive strategies.
Melastomataceae family offers a model for studying apomixis evolution.

Purpose of the Study:

To conduct a detailed embryological and histochemical analysis of seed development in Miconia crenata (apomict) and Miconia tococa (sexual).
To investigate the nutritional contribution of the endosperm and nucellus during embryogenesis.
To explore the structural basis for autonomous seed development in Melastomataceae.

Main Methods:

Comparative embryological studies of Miconia crenata and Miconia tococa.
Histochemical analysis of seed tissues, focusing on polysaccharide localization.
Microscopic examination of endosperm cellularization and nucellar activity.

Main Results:

Both species exhibit nuclear endosperm, partially cellularized and rapidly consumed by the embryo.
Confirmed partial endosperm cellularization for the first time in Melastomataceae.
Nucellar cells accumulate and mobilize polysaccharides, contributing nutritionally to embryo growth.
Adventitious embryos observed in Miconia crenata near the hypostasis.

Conclusions:

Reduced endosperm nutrition, compensated by the nucellus, may drive autonomous apomixis evolution in Melastomataceae.
This pattern mirrors findings in Asteraceae, suggesting convergent evolution.
Findings enhance understanding of angiosperm reproductive strategies and apomixis.