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Gene-expression programs in embryogenic and non-embryogenic carrot cultures.

H D Wilde1, W S Nelson, H Booij

  • 1Department of Biology, Texas A & M University, 77843, College station, Texas, USA.

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Proembryogenic masses (PEMs) in carrot somatic embryogenesis share gene expression with early embryos. This suggests key molecular processes are active in PEMs, with Dc3 marking embryogenic potential.

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Area of Science:

  • Plant Biotechnology
  • Developmental Biology
  • Molecular Genetics

Background:

  • Somatic embryogenesis in carrots (Daucus carota L.) is synchronized using proembryogenic masses (PEMs).
  • Understanding gene expression in PEMs is crucial for controlling somatic embryogenesis.

Purpose of the Study:

  • To compare gene expression profiles of PEMs with embryonic and mature carrot tissues.
  • To identify molecular markers for embryogenic potential during somatic embryogenesis.

Main Methods:

  • In-vitro translation of mRNA populations followed by 2D polyacrylamide gel electrophoresis.
  • Nucleic acid hybridization using cDNA probes (Dc3, Dc5, Dc13) on Northern blots.

Main Results:

  • mRNA populations of PEMs closely resemble those of torpedo-stage embryos.
  • Significant differences in gene expression were observed between PEMs/embryos and mature tissues (hypocotyls, leaves).
  • Embryo-regulated transcripts (Dc3, Dc5, Dc13) showed similar expression patterns in PEMs and somatic embryos, distinct from other tissues.

Conclusions:

  • Molecular processes of embryogenesis are established in PEMs, even in the presence of auxin.
  • Dc3 serves as a reliable molecular marker for identifying cells with embryogenic potential.