Abstract
Environmental factors that influence stomatal conductance (g s) interact through a complex network of signal transduction and have therefore highly interdependent effect.In the present study we examined how plant water status affects stomatal sensitivity to the change of CO2 concentration ([CO2]). We investigated the short-term dynamic of stomatal response to a sudden [CO2] increase (from 400 to 700 µmol(CO2) mol-1) in maize supplied with different amounts of water (resulting ψw = -0.35, -0.52 and -0.75 MPa). Gas exchange measurements were performed in short logging intervals and the response was monitored under two different levels of water vapour pressure deficit (VPD) of 1 and 2 kPa in order to observe the impact of air humidity. Generalized logistic curves were fitted to standardized stomatal response data, which enabled us to objectively estimate the level (relative decrease of g s) and the dynamics of the response.Soil water stress and high VPD significantly decreased relative stomatal closure in response to [CO2] rise, but simultaneously accelerated stomatal response to [CO2], as revealed by shorter half life (t1/2). VPD significantly affected the response of well-watered plants. In contrast, a fast stomatal reaction of water-deprived plants was predetermined by a low xylem water potential (ψw) of the leaf and the influence of air humidity was minor.
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Claims 7
Claim · model-written summary
Soil water stress reduced relative stomatal closure after CO2 increase.
- Treatment
- Soil water stresse0
- Outcome
- relative stomatal closuree0
- Direction
- decreasede0
- Qualifier
- [CO2] risee0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil water stress and high VPD significantly decreased relative stomatal closure in response to [CO2] rise”
t0“maize”
Claim · model-written summary
High VPD reduced relative stomatal closure after CO2 increase.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil water stress and high VPD significantly decreased relative stomatal closure in response to [CO2] rise”
t0“maize”
Claim · model-written summary
Soil water stress accelerated stomatal response to CO2.
- Treatment
- Soil water stresse0
- Outcome
- stomatal response to [CO2]e0
- Direction
- acceleratede0
- Qualifier
- shorter half life (t1/2)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil water stress and high VPD significantly decreased relative stomatal closure in response to [CO2] rise, but simultaneously accelerated stomatal response to [CO2], as revealed by shorter half life (t1/2).”
t0“maize”
Claim · model-written summary
High VPD accelerated stomatal response to CO2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high VPD significantly decreased relative stomatal closure in response to [CO2] rise, but simultaneously accelerated stomatal response to [CO2], as revealed by shorter half life (t1/2).”
t0“maize”
Claim · model-written summary
VPD significantly affected well watered plants.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“VPD significantly affected the response of well-watered plants.”
t0“maize”
Claim · model-written summary
Water deprived plants reacted quickly due to low leaf xylem water potential.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a fast stomatal reaction of water-deprived plants was predetermined by a low xylem water potential (ψw) of the leaf”
t0“maize”
Claim · model-written summary
Humidity had minor influence on water deprived plants.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the influence of air humidity was minor.”
t0“maize”