Abstract
A simple model combining leaf hydraulics and abscisic acid sensitivity can predict stomatal dynamics to short-term changes in plant water status in a conifer.
Highlights
The proposed evolutionary trajectory from simple to more complex mechanisms of stomatal control of leaf water status may provide a useful framework for the general modeling of stomatal control, starting from passive hydraulic models in ferns and lycophytes, with the end goal of modeling stomatal control in angiosperms where both hydraulics and metabolism are important (Buckley et al, 2003; Brodribb and McAdam, 2011)
Dynamic stomatal responses to changes in plant water status are well described by a passive hydraulic model in ferns and lycophytes due to abscisic acid (ABA) insensitivity (Brodribb and McAdam, 2011; Martins et al, 2016), and in gymnosperms over short intervals of water stress due to a limited influence of ABA, which is synthesized slowly in conifers (McAdam and Brodribb, 2014)
The dual ABA-hydraulic model reconciles the dynamics of hydraulic stomatal responses to perturbations in plant water status as seen in ferns, lycophytes, and gymnosperms with the ability of gymnosperms to metabolically regulate maximum gas exchange over longer timescales through ABA
Summary
The proposed evolutionary trajectory from simple to more complex mechanisms of stomatal control of leaf water status may provide a useful framework for the general modeling of stomatal control, starting from passive hydraulic models in ferns and lycophytes, with the end goal of modeling stomatal control in angiosperms where both hydraulics and metabolism are important (Buckley et al, 2003; Brodribb and McAdam, 2011). Dynamic stomatal responses to changes in plant water status are well described by a passive hydraulic model in ferns and lycophytes due to ABA insensitivity (Brodribb and McAdam, 2011; Martins et al, 2016), and in gymnosperms over short intervals of water stress due to a limited influence of ABA, which is synthesized slowly in conifers (McAdam and Brodribb, 2014). We developed an analytic passive hydraulic model based on leaf water relations, augmented by a simple, semimechanistic ABA effect at the guard cell. A Hydraulic-Hormonal Model for Conifer Stomata augmented by osmotic changes in the guard cell to include an ABA effect. Interchanging between turgor pressure, osmotic pressure, and water potential (P 1⁄4 C þ p), Equation 3 can be expressed as dW dt 1⁄4
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