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Positional cues specify and maintain aleurone cell fate in maize endosperm development.
P W Becraft1, Y Asuncion-Crabb
1Zoology and Genetics Department, Iowa State University, Ames, IA 50011, USA. becraft@iastate.edu
Development (Cambridge, England)
|August 23, 2000
Summary
Maize aleurone cell fate is determined by positional cues and the Dek1 gene, which is essential for responding to these signals. Cell fate is not fixed and can change late in development, revealing a hierarchy of gene functions.
Area of Science:
- Plant genetics
- Developmental biology
- Maize endosperm development
Background:
- Aleurone cells in maize endosperm are crucial for nutrient storage.
- Understanding the genetic control of aleurone development is key to crop improvement.
Purpose of the Study:
- To investigate the genetic basis of maize aleurone cell fate specification.
- To identify genes and mechanisms regulating aleurone differentiation.
Main Methods:
- Genetic analysis using maize mutants (dek1).
- Cell lineage tracing with genetic markers (C1, wx1).
- Induction of mutations (transposon, Ds-induced chromosome breakage).
Main Results:
- Aleurone and starchy endosperm share a common lineage, suggesting positional cues specify fate.
- dek1 mutants block aleurone formation, with peripheral cells differentiating as starchy endosperm.
- Loss-of-function in Dek1 allows fate changes late in development, indicating cell fate plasticity.
Conclusions:
- Positional cues are necessary to specify and maintain aleurone fate.
- Dek1 function is required for responding to positional cues.
- A gene hierarchy regulates aleurone cell fate specification and differentiation, linked to endosperm pattern formation.