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Evidence for factors regulating transfer cell-specific expression in maize endosperm.
Plant Molecular Biology
|December 22, 1999
Summary
Researchers identified three genes (BETL-2 to -4) crucial for solute transfer in maize basal endosperm. These genes are coordinately regulated during development, suggesting a specific mechanism for nutrient transport.
Area of Science:
- Plant Molecular Biology
- Genetics
- Biochemistry
Background:
- Maize basal endosperm cells facilitate solute transfer.
- Specific genes are involved in this specialized function.
Purpose of the Study:
- To isolate and characterize genes expressed in the maize basal endosperm transfer layer (BETL).
- To investigate the regulation and function of these BETL genes.
Main Methods:
- Differential hybridization to identify BETL genes.
- Sequence analysis of coding and promoter regions.
- Electrophoretic mobility shift assays (EMSA) to study DNA-binding activities.
Main Results:
- Three novel genes (BETL-2 to -4) were identified, encoding small, secreted, cysteine-rich polypeptides.
- BETL genes are coordinately expressed during early and mid-endosperm development.
- A conserved microsatellite repeat in BETL promoters binds common DNA-binding activities.
Conclusions:
- BETL genes are specifically regulated in maize basal endosperm cells.
- A model for the coordinate regulation of BETL genes involving shared DNA-binding factors is proposed.
- These findings contribute to understanding nutrient transport mechanisms in plants.