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Local and Systemic Effects of Brassinosteroid Perception in Developing Phloem.

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Developing plant phloem orchestrates growth by sensing brassinosteroids. Phloem-specific BRI1 receptor signaling corrects growth defects and antagonizes CLE45 peptide signaling for proper development.

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Area of Science:

  • Plant Biology
  • Developmental Biology
  • Molecular Signaling

Background:

  • Plant vasculature, particularly phloem, is crucial for nutrient transport and systemic signaling.
  • Brassinosteroids are key plant hormones regulating growth and development.
  • Mutants lacking brassinosteroid receptors (bri3) exhibit dwarfism and developmental defects.

Purpose of the Study:

  • To investigate the role of developing phloem in orchestrating plant growth and development.
  • To elucidate the function of brassinosteroid signaling in phloem and its impact on adjacent tissues.
  • To understand the interaction between brassinosteroid and peptide signaling pathways in plant development.

Main Methods:

  • Arabidopsis thaliana genetic mutants (bri3) were analyzed.
  • Phloem-specific expression of the BRI1 receptor was employed for rescue experiments.
  • Analysis of brassinosteroid and CLAVATA3/EMBRYO SURROUNDING REGION-RELATED 45 (CLE45) signaling pathways.

Main Results:

  • Exclusive expression of BRI1 in developing phloem rescued bri3 dwarfism and patterning defects.
  • Brassinosteroid signaling in phloem acts independently of known downstream effectors, suggesting non-canonical signaling.
  • Phloem-specific BRI1 antagonized CLE45 signaling, restoring phloem differentiation, but not overall dwarfism.

Conclusions:

  • Developing phloem plays a critical role in systemic growth regulation through brassinosteroid perception.
  • Brassinosteroid signaling in phloem has both local effects (antagonizing CLE45) and systemic effects on organ formation.
  • Phloem-derived signals are essential for coordinating plant physiology and development.