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Published on: January 26, 2013
The maize dek1 gene functions in embryonic pattern formation and cell fate specification
Philip W Becraft1, Kejian Li, Nrisingha Dey
1Zoology and Genetics Department, Iowa State University, Ames, IA 50011, USA. becraft@iastate.edu
Development (Cambridge, England)
|October 26, 2002
Summary
The maize defective kernel1 (dek1) gene is crucial for embryonic pattern formation and cell fate specification in both the endosperm and leaf epidermis. Its product controls diverse developmental processes based on cellular context.
Area of Science:
- Plant developmental genetics
- Maize embryogenesis
- Cellular differentiation
Background:
- The maize defective kernel1 (dek1) gene is essential for normal kernel development.
- Mutations in dek1 disrupt embryogenesis, leading to chalky endosperm and lack of aleurone.
- Understanding dek1's function is key to deciphering maize developmental pathways.
Purpose of the Study:
- To investigate the specific roles of dek1 in embryonic pattern formation and cell fate specification.
- To characterize the function of dek1 in leaf epidermis and endosperm development.
- To explore the genetic interaction between dek1 and the crinkly4 (cr4) gene.
Main Methods:
- Analysis of maize mutants with varying dek1 alleles (intermediate and weak).
- Phenotypic characterization of embryos, endosperms, and adult plants.
- Genetic analysis, including double mutant construction (dek1 and cr4).
- Transcript analysis of cr4 in dek1 mutants.
- Genetic mosaic analysis to assess cell autonomy.
Main Results:
- Intermediate dek1 alleles cause embryos lacking a shoot axis.
- Weak dek1 alleles result in mosaic aleurone and deformed plants with abnormal epidermal cells.
- dek1 functions in embryonic pattern formation, leaf epidermis development, and endosperm cell fate.
- dek1 and cr4 exhibit complex genetic interactions (epistasis, additivity, synergy).
- cr4 transcript is present in dek1 mutants, indicating DEK1 does not regulate Cr4 transcript accumulation.
- dek1 phenotype is largely cell-autonomous, suggesting it does not regulate a diffusible ligand for CR4.
Conclusions:
- The dek1 gene product plays context-dependent roles in diverse maize developmental processes.
- dek1 is involved in pattern formation and cell fate specification across multiple tissues.
- DEK1 and CR4 likely function in overlapping but distinct developmental pathways.
- DEK1 does not appear to regulate the CR4 ligand, suggesting a non-ligand-based interaction or parallel pathway.
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