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• W3048705798 abstract "Stomatal pores play a central role in the control of carbon assimilation and plant water status. The guard cell pair that borders each pore integrates information from environmental and endogenous signals and accordingly swells or deflates, thereby increasing or decreasing the stomatal aperture. Prior research shows that there is a complex cellular network underlying this process. We have previously constructed a signal transduction network and a Boolean dynamic model describing stomatal closure in response to signals including the plant hormone abscisic acid (ABA), calcium, or reactive oxygen species (ROS). Here we improve the Boolean network model such that it captures the biologically expected response of the guard cell in the absence or following the removal of a closure-inducing signal such as ABA or external Ca2+. The expectation from the biological system is reversibility, i.e., the stomata should reopen after the closing signal is removed. We find that the model’s reversibility is obstructed by the previously assumed persistent activity of four nodes. By introducing time-dependent Boolean functions for these nodes, the model recapitulates stomatal reopening following the removal of a signal. The previous version of the model predicts ~20% closure in the absence of any signal due to uncertainty regarding the initial conditions of multiple network nodes. We systematically test and adjust these initial conditions to find the combinations that appropriately result in open stomata in the absence of a closure signal. We support these results by an analysis of the successive stabilization of feedback motifs in the network, illuminating the system’s dynamic progression towards the open or closed stomatal state. This analysis particularly highlights the role of cytosolic calcium oscillations in causing and maintaining stomatal closure. Overall, we illustrate the strength of the Boolean network modeling framework to efficiently capture cellular phenotypes as emergent outcomes of intracellular biological processes." @default.
• W3048705798 created "2020-08-18" @default.
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• W3048705798 date "2020-08-13" @default.
• W3048705798 modified "2023-09-25" @default.
• W3048705798 title "A Guard Cell Abscisic Acid (ABA) Network Model That Captures the Stomatal Resting State" @default.
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• W3048705798 doi "https://doi.org/10.3389/fphys.2020.00927" @default.
• W3048705798 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7438572" @default.
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• W3048705798 hasPublicationYear "2020" @default.
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