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Related Experiment Videos

Cyclin D-knockout uncouples developmental progression from sugar availability.

Stefan Lorenz1, Stefanie Tintelnot, Ralf Reski

  • 1Freiburg University, Plant Biotechnology, Schaenzlestrasse 1, 79104 Freiburg, Germany.

Plant Molecular Biology
|February 6, 2004
PubMed
Summary
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Physcomitrella moss cyclin D (cycD) gene knockouts show development independent of sugar. This suggests CycD is crucial for linking plant growth to nutrient availability, not cell-cycle control.

Area of Science:

  • Plant biology
  • Molecular genetics
  • Developmental biology

Background:

  • Multicellular organisms regulate proliferation and differentiation based on environmental cues.
  • Mitogen-stimulated induction of cyclin D (cycD) gene expression is vital for these processes.
  • D-type cyclins are key intracellular regulators of the cell cycle in eukaryotes, with known effects in animals but less clear roles in plants.

Purpose of the Study:

  • To investigate the function of cyclin D (cycD) genes in land plants, specifically in the moss Physcomitrella patens.
  • To understand the role of cycD in coupling developmental progression with nutrient availability.

Main Methods:

  • Generation of targeted cycD gene knockouts in Physcomitrella patens.
  • Phenotypic analysis of knockout mutants compared to wild-type plants under varying glucose conditions.

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Main Results:

  • cycD knockouts in Physcomitrella patens displayed limited phenotypic disruption.
  • Mutant plants showed developmental progression irrespective of external glucose supply.
  • Wild-type plants exhibited prolonged juvenile growth and delayed differentiation with glucose, a response absent in cycD knockouts.
  • Growth rate, cell size, and overall plant size remained unaffected in cycD knockouts.

Conclusions:

  • Physcomitrella CycD is not essential for cell-cycle regulation.
  • Physcomitrella CycD plays a significant role in mediating the link between developmental progression and nutrient availability in plants.