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Axial vessel widening in arborescent monocots
Giai Petit1, Fabrice A J DeClerck, Marco Carrer
1Department TeSAF, Forest Ecology Research Unit, University of Padova, Viale dell'Universita, 16-35020 Legnaro (PD), Italy.
Tree Physiology
|February 4, 2014
Summary
Monocot plants, like Bactris gasipaes and Guadua angustifolia, widen their xylem conduits downwards to manage water transport resistance as they grow taller. This strategy mirrors that of dicotyledons, ensuring efficient water flow despite height increases.
Area of Science:
- Plant Physiology
- Xylem Hydraulics
- Vascular Plant Anatomy
Background:
- Dicotyledons compensate for increased hydraulic resistance with height by widening xylem conduits downwards.
- Monocots lack secondary growth, posing a challenge to maintaining xylem hydraulic efficiency during ontogeny.
- The axial vascular structure arrangement in monocots for height compensation is not well understood.
Purpose of the Study:
- To investigate how two arborescent monocots, Bactris gasipaes and Guadua angustifolia, arrange their axial vascular structure to compensate for height-related hydraulic resistance.
- To compare the hydraulic architecture of these monocots with that of dicot trees.
Main Methods:
- Measurement of vessel lumina and estimation of hydraulic diameter (Dh) at various stem heights in B. gasipaes and G. angustifolia.
- Estimation of Dh variation along the leaf rachis of B. gasipaes.
- Analysis of Dh patterns from stem center to periphery in B. gasipaes.
Main Results:
- Hydraulic diameter (Dh) increased basally from stem apex to base in both species, with scaling exponents comparable to dicot trees.
- In B. gasipaes, Dh decreased from the stem's center towards the periphery, an inverse pattern to dicots.
- A basal increase in Dh was also observed along the leaf rachis of B. gasipaes.
Conclusions:
- The studied monocots exhibit an axial xylem conduit pattern similar to dicots for managing hydrodynamic resistance.
- This hydraulic design helps minimize the negative impact of root-to-leaf length on water transport efficiency in monocots.
- Monocots possess evolved strategies to maintain hydraulic efficiency despite their growth form and lack of secondary growth.
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