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Scaling relationships and vessel packing in petioles
Dustin M Ray1, Cynthia S Jones1
1University of Connecticut, Ecology and Evolutionary Biology Department, 75 N. Eagleville Road, Unit 3043, Storrs, ConnecticutT, 06269, U.S.A.
American Journal of Botany
|April 18, 2018
Summary
Petiole vascular and structural tissues do not show the tradeoffs seen in stems, likely because fibers are outside the xylem. This separation allows for greater developmental plasticity in petioles.
Area of Science:
- Plant anatomy
- Plant physiology
- Evolutionary biology
Background:
- Tradeoffs between mechanical support and water transport are well-studied in woody stems.
- Similar tradeoffs in petioles, the connection between stems and leaves, are less understood.
Purpose of the Study:
- Investigate scaling relationships between structural and vascular tissues in petioles.
- Examine xylem and phloem tissue areas, vessel packing, and tissue scaling with lamina traits.
Main Methods:
- Analyzed allometric relationships in petioles of eleven Pelargonium species.
- Measured cross-sectional areas of petiole tissues, xylem, and phloem.
- Used standardized major axis regressions to analyze scaling relationships.
Main Results:
- Pelargonium petiole vessels followed Sperry's packing rule.
- No tradeoff was observed between vessel area and fiber area, unlike in stems.
- Xylem and phloem scaling varied by bundle position; most petiole and lamina traits were independent.
Conclusions:
- Petioles exhibit vascular tissue traits similar to stems.
- The absence of a structural-vascular tradeoff is attributed to fibers located outside the xylem.
- Separation of conductive and supportive tissues in petioles may explain their developmental and evolutionary plasticity.
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