Recent Posts

Extrapolating physiological response to drought through step-by-step analysis of water potential

Guillaume Charrier Université Clermont Auvergne, INRAE, PIAF, F-63000 Clermont-Ferrand, France. guillaume.charrier@inrae.fr Water potential (Ψ) defines the energy required to move water between the different compartments of a closed system. Water flows passively in the direction of decreasing…

KIN10 promotes stomatal development through stabilization of the SPEECHLESS transcription factor (Nat. Commun.)

Plants communicate with the environment through stomata (i.e., pores found on leaf surfaces) and regulate gas exchange depending on internal and external cues by optimizing stomata density. Still, how plants integrate metabolic and environmental signals remain to be determined. Here, Han and colleagues…

Review: Guard cell metabolism and stomatal function (Annu. Rev. Plant Biol.)

Stomatal conductance, gs, is one of the most important and highly regulated plant processes. Lawson and Matthews review how guard cell metabolism, stomatal anatomy and patterning, and signals from the mesophyll affect gs which in turn affects plant productivity and water use efficiency. This is an excellent…

How far does stomatal activator and inhibitor signaling work in the plant epidermis? (bioRxiv)

Stomata are the pores on the plant surface surrounded by a pair of guard cells that control gaseous exchange and water loss. Among the many genes involved in stomatal patterning and development, EPIDERMAL PATTERNING FACTOR 1 (EPF1) and STOMAGEN encode signaling peptides and acts as negative (inhibitor)…

Phylogenomic evidence for reductive evolution of stomata (Curr. Biol.)

Colonization of the terrestrial environment by land plants (embryophytes), a monophyletic clade that evolved from freshwater streptophyte algae, forever changed Earth by transforming biogeochemical cycles. The evolution of stomata was a key adaptation that allowed the colonization of terra firma. Present…

Tools to unravel the mystery of why some tomatoes are hairier than others

Galdon-Armero et al. present an image resource that can be used to identify natural variation in leaf epidermal development in tomato. The Plant Cell (2020). https://doi.org/10.1105/tpc.20.00127 By Javier Galdon-Armero and Cathie Martin, John Innes Centre, Norwich, UK Background: Just like our…

ALIX helps to open the pore

García-León et al. reveal a function for a trafficking protein in stomatal aperture regulation. Plant Cell https://doi.org/10.1105/tpc.19.00399 By Marta García-León and Vicente Rubio Centro Nacional de Biotecnología (CNB-CSIC) Darwin, 3. 28049 Madrid, Spain  Background: Plants protect…

Abscisic acid-independent stomatal CO2 signal transduction pathway and convergence of CO2 and ABA signaling downstream of OST1 kinase (PNAS - $)

The global increase in CO2 concentrations results in the reduced opening of the stomata. Although reduction in the stomatal opening in response to drought relies on abscisic acid (ABA), less is known about the mechanism controlling stomatal aperture in response to elevated CO2. Hsu et al. examined stomatal…

ABA-mediated regulation of stomatal density is OST1-independent (Plant Direct)

Stomata are not only important for CO2 uptake, but are also important in limiting water loss when the water availability is running low. Stress hormone ABA activates protein kinase OPEN STOMATA 1 (OST1) leading to opening of ion channels, water efflux and stomatal closure. Increased levels of ABA decrease…