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Reticulate leaf venation in Pilea peperomioides is a Voronoi diagram
CiCi Xingyu Zheng1, Shirsa Palit1, Matthew Venezia1
1Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, USA.
Nature Communications
|May 12, 2026
Summary
Plant leaf venation patterns form complex loops. A new model using auxin transport in Chinese money plants explains how these reticulate vein patterns develop, offering insights into plant morphogenesis.
Area of Science:
- Plant Biology
- Developmental Biology
- Morphogenesis
Background:
- Reticulate leaf venation, featuring loops, is common in flowering plants.
- The geometry and development (morphogenesis) of these vein patterns are not fully understood.
Purpose of the Study:
- To investigate the formation of reticulate leaf venation in the Chinese money plant (Pilea peperomioides).
- To propose and validate a mechanistic model for vein pattern development.
Main Methods:
- Geometric analysis of major veins in Pilea peperomioides.
- Development of a mechanistic model based on polar auxin transport.
- Experimental validation of the proposed model.
Main Results:
- Major veins in Pilea peperomioides approximate a Voronoi diagram around hydathodes.
- The model successfully generates Voronoi patterns and loops through auxin transport.
- Veins bisect the space between auxin sources, unlike classical source-sink models.
Conclusions:
- Polar auxin transport provides a new mechanistic explanation for reticulate vein formation.
- This model challenges classical views and offers a paradigm shift in understanding leaf venation.
- The findings may be applicable to studying vein development in other plant species.
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