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The Widened Pipe Model of plant hydraulic evolution
Loren Koçillari1,2, Mark E Olson3, Samir Suweis1
1Dipartimento di Fisica e Astronomia G. Galilei, Istituto Nazionale di Fisica Nucleare, Università di Padova, 35131 Padova, Italy.
Plants evolve xylem conduit diameters to balance water transport efficiency with construction costs and embolism risk. A new Widened Pipe Model (WPM) predicts a universal narrowing-to-widening profile from stem tips to base, confirmed by global data.
Area of Science:
- Plant biology
- Ecology
- Evolutionary biology
Background:
- Xylem conduits are vital for water transport in plants, influencing global water and carbon cycles.
- Xylem conduit diameter is shaped by natural selection due to trade-offs between water transport efficiency, embolism risk, and construction costs.
Purpose of the Study:
- To present and test the Widened Pipe Model (WPM) for plant hydraulic evolution.
- To understand how natural selection shapes xylem conduit diameters across diverse plant types and environments.
Main Methods:
- Developed the Widened Pipe Model (WPM) based on Pareto modeling of selection vectors.
- Tested WPM predictions against a global dataset of plant hydraulic traits.
Main Results:
- The WPM accurately predicts a universal profile of xylem conduit diameter widening from stem tips to base.
- Data from diverse terrestrial plants confirm the WPM's predictions, highlighting the role of carbon economy in shaping plant hydraulics.
Conclusions:
- The Widened Pipe Model provides a robust framework for understanding plant hydraulic evolution.
- Carbon economy is a significant driver of natural selection on xylem conduit diameter, influencing plant structure and adaptation to environmental changes.
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