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Related Experiment Videos

Coordinate gene expression during somatic embryogenesis in carrots.

Z R Sung1, R Okimoto

  • 1Department of Genetics, University of California, Berkeley, California 94720.

Proceedings of the National Academy of Sciences of the United States of America
|May 1, 1983
PubMed
Summary

A carrot mutant, WCH105, reveals coordinated regulation of callus and embryo traits. This mutant produces embryo-specific proteins and lacks a callus-specific protein factor, indicating a shared regulatory mechanism.

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Area of Science:

  • Plant molecular biology
  • Developmental biology
  • Biochemistry

Background:

  • Carrot (Daucus carota) cultures exhibit distinct biochemical profiles between callus tissues and embryos.
  • Callus produces specific proteins and a conditioning factor for their synthesis, while embryos produce embryo-specific proteins and can inactivate cycloheximide.
  • A conditioning factor essential for callus growth is distinct from the one regulating callus-specific protein synthesis.

Purpose of the Study:

  • To investigate the regulatory mechanisms governing biochemical differences between carrot callus and embryos.
  • To characterize a mutant (WCH105) exhibiting altered trait expression in callus and embryo development.
  • To elucidate the relationship between callus-specific and embryo-specific protein production and cycloheximide inactivation.

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Main Methods:

  • Comparative biochemical analysis of wild-type carrot callus and embryos.
  • Characterization of the mutant WCH105 for protein synthesis and enzymatic activity.
  • Assessment of conditioning factor production in callus tissues of wild-type and mutant carrot lines.

Main Results:

  • The mutant WCH105 inactivates cycloheximide in both callus and embryos.
  • WCH105 produces embryo-specific proteins instead of callus-specific proteins in callus tissue.
  • Callus tissue of WCH105 fails to produce the conditioning factor for callus-specific protein synthesis but retains callus growth capability.

Conclusions:

  • Callus-specific and embryo-specific traits in carrot are coordinately regulated in an opposing manner.
  • A common underlying mechanism appears to activate one set of functions while simultaneously inactivating the other.
  • The mutant WCH105 is likely impaired in this common regulatory mechanism, providing insight into carrot development.