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Plants adjust growth in response to neighbors, with Phytochrome Interacting Factors (PIFs) driving elongation via auxin. This study reveals PIFs initiate rapid gene expression changes in cotyledons and hypocotyls, coordinating plant growth.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Plants exhibit adaptive growth responses to environmental cues like neighbor proximity to optimize resource acquisition.
  • Phytochrome Interacting Factors (PIFs) are key transcription factors that mediate shade avoidance responses, promoting organ elongation.
  • PIFs are regulated by light signaling pathways, particularly involving phytochrome B, and influence downstream hormonal responses like auxin production.

Purpose of the Study:

  • To investigate the spatiotemporal dynamics of gene expression in response to neighbor proximity in Arabidopsis thaliana.
  • To elucidate the roles of Phytochrome Interacting Factors (PIFs) and auxin signaling in mediating organ-specific growth adjustments.
  • To identify genes and regulatory networks involved in both local and distal signaling pathways that control hypocotyl elongation.

Main Methods:

  • Comparative transcriptomic analysis of cotyledons and hypocotyls in Arabidopsis thaliana under simulated neighbor proximity conditions.
  • Analysis of gene expression patterns at early time points (within 15 minutes) to capture rapid transcriptional reprogramming.
  • Experimental manipulation to assess the necessity and sufficiency of cotyledon-derived auxin for hypocotyl growth.

Main Results:

  • Phytochrome Interacting Factors (PIFs) rapidly induce transcriptional reprogramming in both cotyledons and hypocotyls, including early auxin response genes.
  • Cotyledon-derived auxin is demonstrated to be both necessary and sufficient for initiating hypocotyl elongation.
  • Distinct organ-specific transcriptional divergence occurs over time, with identification of genes potentially underlying differential elongation.
  • A conserved gene expression signature for growth promotion across different developmental and environmental contexts was uncovered.

Conclusions:

  • Neighbor proximity triggers a rapid, coordinated transcriptional response involving PIFs and auxin signaling in distinct plant organs.
  • Both local PIF activity and long-distance auxin signaling from cotyledons contribute to hypocotyl elongation.
  • Understanding these organ-specific responses provides insights into plant adaptation and a conserved growth promotion mechanism.