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The dual effect of abscisic acid on stomata
- Source :
- New Phytologist, New Phytologist, 2013, 197 (1), pp.65-72. ⟨10.1111/nph.12013⟩, New Phytologist, Wiley, 2013, 197 (1), pp.65-72. ⟨10.1111/nph.12013⟩
- Publication Year :
- 2013
- Publisher :
- HAL CCSD, 2013.
-
Abstract
- International audience; The classical view that the drought-related hormone ABA simply acts locally at the guard cell level to induce stomatal closure is questioned by differences between isolated epidermis and intact leaves in stomatal response to several stimuli. We tested the hypothesis that ABA mediates, in addition to a local effect, a remote effect in planta by changing hydraulic regulation in the leaf upstream of the stomata. By gravimetry, porometry to water vapour and argon, and psychrometry, we investigated the effect of exogenous ABA on transpiration, stomatal conductance and leaf hydraulic conductance of mutants described as ABA-insensitive at the guard cell level. We show that foliar transpiration of several ABA-insensitive mutants decreases in response to ABA. We demonstrate that ABA decreases stomatal conductance and down-regulates leaf hydraulic conductance in both the wildtype Col-0 and the ABA-insensitive mutant ost2-2. We propose that ABA promotes stomatal closure in a dual way via its already known biochemical effect on guard cells and a novel, indirect hydraulic effect through a decrease in water permeability within leaf vascular tissues. Variability in sensitivity of leaf hydraulic conductance to ABA among species could provide a physiological basis to the isohydric or anisohydric behaviour.
- Subjects :
- 0106 biological sciences
Stomatal conductance
anisohydric
Arabidopsis thaliana
Physiology
hydraulic conductance (Kleaf)
isohydric
Mutant
Arabidopsis
Plant Science
01 natural sciences
Plant Epidermis
transpiration
03 medical and health sciences
chemistry.chemical_compound
Plant Cells
Guard cell
Botany
Phosphoprotein Phosphatases
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
Argon
Abscisic acid
Vascular tissue
030304 developmental biology
Transpiration
0303 health sciences
biology
Epidermis (botany)
leaf
Arabidopsis Proteins
organic chemicals
fungi
Water
food and beverages
stomatal conductance (gs)
Biological Transport
Plant Transpiration
aquaporin (PIP)
biology.organism_classification
Droughts
Plant Leaves
chemistry
ABA
Mutation
Plant Stomata
Abscisic Acid
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 0028646X and 14698137
- Database :
- OpenAIRE
- Journal :
- New Phytologist, New Phytologist, 2013, 197 (1), pp.65-72. ⟨10.1111/nph.12013⟩, New Phytologist, Wiley, 2013, 197 (1), pp.65-72. ⟨10.1111/nph.12013⟩
- Accession number :
- edsair.doi.dedup.....8954ad0a7a7f9e334e1240ac0da47db7
- Full Text :
- https://doi.org/10.1111/nph.12013⟩