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Phytochrome B regulates resource allocation in Brassica rapa.

Andrej A Arsovski1, Joseph E Zemke1, Benjamin D Haagen1

  • 1Department of Biology, University of Washington, Seattle, WA, USA.

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|March 8, 2018
PubMed
Summary

Phytochromes regulate plant growth by managing carbon resources. In Brassica rapa, mutations in PhyB impaired responses to elevated CO2, affecting growth, photosynthesis, and yield.

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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Agricultural Science

Background:

  • Light signaling networks, particularly phytochromes (phy), are crucial for plant resource allocation, impacting growth and yield.
  • Previous research on light-modulated growth has primarily focused on Arabidopsis thaliana, necessitating studies in crop models.

Purpose of the Study:

  • To investigate the conservation of the phytochrome-carbon network in the crop model Brassica rapa.
  • To determine the role of Phytochrome B (PhyB) in Brassica rapa's response to elevated CO2 levels and its impact on growth and yield.

Main Methods:

  • Brassica rapa seedlings were exposed to elevated CO2 levels, and growth parameters were measured.
  • Putative Brassica rapa PhyB orthologs were identified, and nonsense alleles (BrphyB mutants) were isolated.
  • Auxin-dependent and chloroplast development genes were analyzed in mutant seedlings.

Main Results:

  • Elevated CO2 increased hypocotyl length, biomass, and lateral root formation in B. rapa, dependent on nitrogen and auxin transport.
  • BrphyB mutants exhibited significantly reduced CO2-stimulated growth, misregulated auxin and chloroplast genes.
  • Adult mutant plants showed decreased chlorophyll, photosynthesis, stomatal index, and seed yield.

Conclusions:

  • Phytochromes play a conserved, holistic role in regulating resource allocation, biomass production, and metabolic status in plants.
  • PhyB is essential for mediating CO2-driven growth responses and maintaining crop productivity in Brassica rapa.