Biochemistry

Abstract

CS-21-2 - Sugar transport to guard cells is required for stomatal opening and plant growth

Tuesday, July 17
8:53 AM - 9:13 AM

CO2 for photosynthesis enters plants via stomata – small adjustable pores on the leaf surface. Stomatal opening is promoted by increase in the turgor pressure of the two flanking guard cells through accumulation of osmotically active inorganic (K+, Cl-) and organic (malate2- and sugars) solutes. Given that CO2 fixation within guard cells can only provide a limited amount of carbon, symplastically isolated guard cells likely rely on external carbon sources to fulfil their metabolic needs. Here, we investigated the role of sugar import in stomatal opening in Arabidopsis thaliana. We show that the synergistic action amongst members of the plasma membrane monosaccharide/proton symporters STP family is required for stomatal opening and CO2 uptake driving photosynthesis and biomass production. Furthermore, we reveal that the uptake of apoplastic sugars into guard cells provides the main source of carbon for guard cell starch accumulation. Thus, at the start of the day, guard cell metabolism for stomatal opening relies predominantly on mesophyll-derived sugars imported into guard cells in the form of monosaccharides. This study highlights that a tight coordination between mesophyll and guard cell carbohydrate metabolism is critical to promote stomatal opening and plant growth.


 

Co-Authors

Arianna Nigro – University of Zürich; Klára Panzarová – Photon Systems Instruments

Diana Santelia, PhD

Group Leader
University of Zurich

Presentation(s):

Send Email for Diana Santelia


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CS-21-2 - Sugar transport to guard cells is required for stomatal opening and plant growth



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