Transcriptomics at Maize Embryo/Endosperm Interfaces Identifies a Transcriptionally Distinct Endosperm Subdomain...

Area of Science:

• Plant Biology
• Developmental Biology
• Genomics

Background:

• Seeds are complex structures with multiple genetically distinct tissues.
• Understanding interactions between these tissues, like embryo and endosperm, is challenging due to spatial complexity.
• Maize (Zea mays) kernels offer a model for studying seed development due to their large size.

Purpose of the Study:

• To characterize genome-wide expression profiles at different embryo/endosperm interfaces in maize seeds.
• To identify specific transcriptomic signatures in interface tissues.
• To investigate the role and dynamics of the endosperm adjacent to scutellum (EAS) tissue.

Main Methods:

• Utilized the large maize kernel for spatially accurate transcriptomic analysis.
• Compared gene expression profiles of whole seed compartments with specific interface tissues.
• Analyzed gene expression in wild-type and embryo-specific mutants.

Main Results:

• Identified distinct transcriptomic signatures in the scutellar aleurone layer and the endosperm adjacent to scutellum (EAS).
• The EAS, a novel tissue adjacent to the scutellum, is enriched in transporter genes.
• EAS gene expression is influenced by the presence of the embryo, and EAS cells undergo programmed cell death and replacement.

Conclusions:

• The endosperm adjacent to scutellum (EAS) is a dynamic interface tissue crucial for maize seed development.
• EAS facilitates nutrient transport and interacts with the growing embryo through cell turnover.
• This study provides new insights into intercompartmental communication within developing seeds.