Abstract
The effect of leaf-air vapor pressure difference (VPD) on the magnitude of the stomatal response to blue light was investigated in soybean (Glycine max) by administering blue light pulses (22 seconds by 120 micromoles per square meter per second) at different levels of VPD and temperature. At 20 degrees C and 25 degrees C, the magnitude of the integrated conductance response decreased with increasing VPD (0.4 to 2.6 kiloPascals), due to an earlier onset of stomatal closure that terminated the pulse response. In contrast, at 30 degrees C this magnitude increased with rising VPD (0.9 to 3.5 kiloPascals), due to an increasing maximum excursion of the conductance response despite the accelerated onset of stomatal closure. When the feedforward response of stomata to humidity caused steady state transpiration to decrease with increasing VPD, the magnitude of the pulse-induced conductance response correlated with VPD rather than with transpiration. This suggests that water relations or metabolite movements within epidermal rather than bulk leaf tissue interacted with guard cell photobiological properties in regulating the magnitude of the blue light response. VPD modulation of pulse magnitude could reduce water loss during stomatal responses to transient illumination in natural light environments.
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Claims 7
Claim · model-written summary
At 20 and 25 degrees C, the magnitude of the integrated conductance response decreased with increasing VPD.
- Taxon
- soybean
Glycine maxe1 - Treatment
- increasing VPDe2
- Outcome
- magnitude of the integrated conductance responsee2
- Direction
- decreasede2
- Qualifier
- At 20 degrees C and 25 degrees Ce2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect of leaf-air vapor pressure difference (VPD) on the magnitude of the stomatal response to blue light was investigated in soybean (Glycine max)”
e2“At 20 degrees C and 25 degrees C, the magnitude of the integrated conductance response decreased with increasing VPD (0.4 to 2.6 kiloPascals), due to an earlier onset of stomatal closure that terminated the pulse response”
Claim · model-written summary
The decrease in conductance-response magnitude with VPD is concluded to be due to an earlier onset of stomatal closure that terminated the pulse response.
- Taxon
- soybeanGlycine maxe1
- Outcome
- magnitude of the integrated conductance responsee2
- Qualifier
- an earlier onset of stomatal closure that terminated the pulse responsee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect of leaf-air vapor pressure difference (VPD) on the magnitude of the stomatal response to blue light was investigated in soybean (Glycine max)”
e2“At 20 degrees C and 25 degrees C, the magnitude of the integrated conductance response decreased with increasing VPD (0.4 to 2.6 kiloPascals), due to an earlier onset of stomatal closure that terminated the pulse response”
Claim · model-written summary
At 30 degrees C, the magnitude of the conductance response increased with rising VPD.
- Taxon
- soybeanGlycine maxe1
- Treatment
- rising VPDe3
- Outcome
- magnitudee3
- Direction
- increasede3
- Qualifier
- at 30 degrees Ce3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect of leaf-air vapor pressure difference (VPD) on the magnitude of the stomatal response to blue light was investigated in soybean (Glycine max)”
e3“In contrast, at 30 degrees C this magnitude increased with rising VPD (0.9 to 3.5 kiloPascals), due to an increasing maximum excursion of the conductance response despite the accelerated onset of stomatal closure”
Claim · model-written summary
The increase in conductance-response magnitude at 30 degrees C is concluded to be due to an increasing maximum excursion of the conductance response despite accelerated stomatal closure.
- Taxon
- soybeanGlycine maxe1
- Outcome
- magnitudee3
- Qualifier
- an increasing maximum excursion of the conductance responsee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect of leaf-air vapor pressure difference (VPD) on the magnitude of the stomatal response to blue light was investigated in soybean (Glycine max)”
e3“In contrast, at 30 degrees C this magnitude increased with rising VPD (0.9 to 3.5 kiloPascals), due to an increasing maximum excursion of the conductance response despite the accelerated onset of stomatal closure”
Claim · model-written summary
The magnitude of the pulse-induced conductance response correlated with VPD rather than with transpiration.
- Taxon
- soybeanGlycine maxe1
- Treatment
- VPDe4
- Outcome
- magnitude of the pulse-induced conductance responsee4
- Comparator
- transpiratione4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect of leaf-air vapor pressure difference (VPD) on the magnitude of the stomatal response to blue light was investigated in soybean (Glycine max)”
e4“the magnitude of the pulse-induced conductance response correlated with VPD rather than with transpiration”
Claim · model-written summary
Water relations or metabolite movements within epidermal tissue, rather than bulk leaf tissue, are suggested to interact with guard cell photobiology in regulating the blue light response.
- Taxon
- soybeanGlycine maxe1
- Outcome
- magnitude of the blue light responsee5
- Qualifier
- water relations or metabolite movements within epidermal rather than bulk leaf tissuee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect of leaf-air vapor pressure difference (VPD) on the magnitude of the stomatal response to blue light was investigated in soybean (Glycine max)”
e5“water relations or metabolite movements within epidermal rather than bulk leaf tissue interacted with guard cell photobiological properties in regulating the magnitude of the blue light response”
Claim · model-written summary
VPD modulation of pulse magnitude could reduce water loss during stomatal responses to transient illumination in soybean.
- Taxon
- soybeanGlycine maxe1
- Outcome
- water loss during stomatal responses to transient illuminatione6
- Qualifier
- VPD modulation of pulse magnitudee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effect of leaf-air vapor pressure difference (VPD) on the magnitude of the stomatal response to blue light was investigated in soybean (Glycine max)”
e6“VPD modulation of pulse magnitude could reduce water loss during stomatal responses to transient illumination in natural light environments”