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The C. elegans Excretory Canal as a Model for Intracellular Lumen Morphogenesis and In Vivo Polarized Membrane Biogenesis in a Single Cell: labeling by GFP-fusions, RNAi Interaction Screen and Imaging
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The canalization hypothesis - challenges and alternatives.

Sree Janani Ravichandran1, Nguyen Manh Linh1, Enrico Scarpella1

  • 1Department of Biological Sciences, University of Alberta, CW-405 Biological Sciences Building, Edmonton, AB, T6G 2E9, Canada.

The New Phytologist
|April 15, 2020
PubMed
Summary
This summary is machine-generated.

The canalization hypothesis explains vascular strand formation via auxin transport feedback. New evidence challenges interpretations, not the core concept of plant vascular development.

Keywords:
PIN genesTsvi Sachsauxin signalingauxin transportcanalization hypothesisleaf developmentvascular differentiationvein patterning

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Area of Science:

  • Plant biology
  • Developmental biology
  • Physiology

Background:

  • The canalization hypothesis, proposed 50 years ago, explains vascular strand formation.
  • It posits positive feedback between auxin transport and cell conductivity.
  • This process leads to the selection of auxin transport 'canals' that differentiate into vascular strands.

Purpose of the Study:

  • To re-evaluate the canalization hypothesis in light of recent evidence.
  • To distinguish between the core concept and current interpretations of the hypothesis.

Main Methods:

  • Review of existing literature and experimental evidence.
  • Conceptual analysis of the canalization hypothesis and its interpretations.

Main Results:

  • Accumulating evidence appears incompatible with current interpretations of the canalization hypothesis.
  • The core concept of the original canalization hypothesis remains viable.

Conclusions:

  • Challenging evidence is incompatible with current interpretations, not the original concept.
  • The canalization hypothesis provides a foundational framework for understanding vascular strand patterning.