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Isolation and developmental characterization of temperature-sensitive carrot cell variants.

G Giuliano1, F Lo Schiavo, M Terzi

  • 1Istituto di Mutagenesi e Differenziamento, C.N.R., Via Svezia 10, I-56100, Pisa, Italy.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 22, 2013
PubMed
Summary

A temperature-sensitive carrot cell line (ts 2) can regenerate plantlets at 24°C but not at 31°C. This finding aids in understanding plant regeneration and embryogenesis.

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Area of Science:

  • Plant biology
  • Developmental biology
  • Cell biology

Background:

  • Carrot cell lines proliferate indefinitely with auxin (2,4-D).
  • Auxin removal triggers plantlet regeneration, mimicking in vivo embryogenesis.
  • Understanding the genetic control of plant regeneration is crucial.

Purpose of the Study:

  • To investigate the genetic basis of plant regeneration using temperature-sensitive mutants.
  • To identify specific genes and pathways involved in carrot somatic embryogenesis.

Main Methods:

  • Isolation and characterization of temperature-sensitive carrot cell lines (ts 2, ts 5, ts 11).
  • Culturing cells at permissive (24°C) and non-permissive (31°C) temperatures.
  • Observing and comparing regeneration and proliferation phenotypes across different temperatures.

Main Results:

  • The ts 2 cell line failed to regenerate at 31°C but regenerated normally at 24°C.
  • Temperature shifts did not affect differentiated ts 2 plantlets.
  • Cell proliferation was inhibited at 31°C in ts 5 and ts 11 lines, with some embryogenesis occurring.

Conclusions:

  • Temperature-sensitive mutations can disrupt specific stages of carrot regeneration.
  • The ts 2 mutant provides a tool to study the temperature-dependent regulation of embryogenesis.
  • Further research can elucidate the molecular mechanisms underlying auxin-induced regeneration and its temperature sensitivity.