Mechanisms of endosperm initiation

Area of Science:

• Plant reproductive biology
• Developmental genetics
• Molecular signaling

Background:

• Endosperm development is vital for seed viability and global food supply.
• Studying early endosperm development in angiosperms is challenging due to its location within the ovule.
• Recent advances utilize mutants, cell-specific markers, and hormone reporters to elucidate these processes.

Purpose of the Study:

• To review recent discoveries in female gametophyte maturation, fertilization, and early endosperm development.
• To focus on the regulation of sexual and autonomous endosperm initiation in Arabidopsis and Hieracium.
• To compare endosperm development mechanisms across different plant groups, including monocots.

Main Methods:

• Review of existing literature on mutants, cell-specific markers, and plant hormone sensing reporters.
• Comparative analysis of endosperm development in Arabidopsis (sexual) and Hieracium (apomictic).
• Examination of molecular pathways involving Polycomb Repressive Complex 2 (PRC2), plant hormones, and transcription factors.

Main Results:

• Polycomb Repressive Complex 2 (PRC2), hormones, and transcription factors regulate fertilization-induced endosperm formation in Arabidopsis.
• Increased auxin and PRC2 inactivation can trigger fertilization-independent endosperm proliferation in Arabidopsis.
• FERTILIZATION-INDEPENDENT ENDOSPERM, AutE, and LOP are essential for autonomous endosperm development in Hieracium.

Conclusions:

• Comparative understanding of early endosperm development cues is essential for crop improvement.
• Exploring fertilization-independent endosperm formation could enhance crop resilience against stress-induced failure.
• Genetic engineering for resilient seed crops can benefit from insights into endosperm development pathways.