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Heterochronic mutations affecting shoot development in maize.

R S Poethig1

  • 1Plant Science Institute, Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6018.

Genetics
|August 1, 1988
PubMed
Summary

Three maize mutations, Teopod 1 (Tp1), Teopod 2 (Tp2), and Teopod 3 (Tp3), prolong juvenile development, altering plant architecture and reproductive structures. These gain-of-function mutations impact maize development by extending vegetative growth phases.

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Area of Science:

  • Plant genetics
  • Developmental biology
  • Maize genetics

Background:

  • Teopod 1 (Tp1), Teopod 2 (Tp2), and Teopod 3 (Tp3) are semidominant mutations in maize.
  • These mutations significantly affect both vegetative and reproductive development.

Purpose of the Study:

  • To analyze the developmental effects of Tp1, Tp2, and Tp3 mutations in maize.
  • To investigate the genetic basis and expression patterns of these Teopod mutations.
  • To explore the implications of heterochrony in plant development.

Main Methods:

  • Phenotypic analysis of maize mutants across different inbred backgrounds.
  • Genetic analysis of mutation expression with varying doses of wild-type alleles.
  • Comparative study of Tp1, Tp2, and Tp3 phenotypes.

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Main Results:

  • All three mutations increase vegetative phytomers, tillering, and prop roots, while decreasing leaf and internode size.
  • Mutations transform reproductive structures into vegetative ones, indicating prolonged juvenile development.
  • Tp1 and Tp2 are gain-of-function mutations with similar phenotypes, while Tp3 has less extreme effects and a different expression pattern across inbred lines.

Conclusions:

  • The Teopod mutations result in a heterochronic phenotype, characterized by the prolonged expression of juvenile vegetative programs overlapping with reproductive development.
  • Tp1 and Tp2 control related but distinct functions, as suggested by their phenotypes and gene dose responses.
  • Understanding these mutations provides insights into maize developmental pathways and evolutionary processes.