Abstract
Plants produced at high relative air humidity (RH) show poor control of water loss after transferring to low RH, a phenomenon which is thought to be due to their stomatal behaviour. The stomatal anatomy and responses of moderate (55%) and high (90%) RH grown Tradescantia virginiana plants to treatments that normally induce stomatal closure, i.e. desiccation, abscisic acid (ABA) application and exposure to darkness were studied using attached or detached young, fully expanded leaves. Compared with plants grown at moderate RH the transpiration rate, stomatal conductance and aperture of high RH grown plants measured at the same condition (40% RH) were, respectively, 112, 139 and 132% in light and 141, 188 and 370% in darkness. Besides the differences in stomatal size (guard cell length was 56.7 and 73.3 µm for moderate and high RH grown plants, respectively), there was a clear difference in stomatal behaviour. The stomata responded to desiccation, ABA and darkness in both moderate and high RH grown plants, but the high variability of stomatal closure in high RH grown plants was striking. Some stomata developed at high RH closed in response to darkness or to a decrease in relative water content to the same extent as did stomata from moderate RH grown plants, whereas others closed only partly or did not close at all. Evidently, some as yet unidentified physiological or anatomical changes during development disrupt the normal functioning of some stomata in leaves grown at high RH. The failure of some stomata to close fully in response to ABA suggests that ABA deficiency was not responsible for the lack of stomatal closure in response to desiccation.
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Claims 11
Claim · model-written summary
High humidity grown plants had greater transpiration in light and darkness.
- Taxon
- Tradescantia virginiana
Tradescantia virginianat0 - Treatment
- high RHe0
- Outcome
- transpiration ratee0
- Direction
- higherinferrede0
- Value
- 112e0
- Qualifier
- in lighte0
- Comparator
- moderate RHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with plants grown at moderate RH the transpiration rate, stomatal conductance and aperture of high RH grown plants measured at the same condition (40% RH) were, respectively, 112, 139 and 132% in light and 141, 188 and 370% in darkness”
t0“Tradescantia virginiana”
Claim · model-written summary
High humidity grown plants had greater stomatal conductance in light.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Outcome
- stomatal conductancee0
- Direction
- higherinferrede0
- Value
- 139e0
- Qualifier
- in lighte0
- Comparator
- moderate RHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with plants grown at moderate RH the transpiration rate, stomatal conductance and aperture of high RH grown plants measured at the same condition (40% RH) were, respectively, 112, 139 and 132% in light and 141, 188 and 370% in darkness”
t0“Tradescantia virginiana”
Claim · model-written summary
High humidity grown plants had greater stomatal aperture in light.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Outcome
- aperturee0
- Direction
- higherinferrede0
- Value
- 132%e0
- Qualifier
- in lighte0
- Comparator
- moderate RHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with plants grown at moderate RH the transpiration rate, stomatal conductance and aperture of high RH grown plants measured at the same condition (40% RH) were, respectively, 112, 139 and 132% in light and 141, 188 and 370% in darkness”
t0“Tradescantia virginiana”
Claim · model-written summary
In darkness, transpiration was 141% of moderate humidity plants.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Outcome
- transpiration ratee0
- Direction
- higherinferrede0
- Value
- 141e0
- Qualifier
- in darknesse0
- Comparator
- moderate RHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with plants grown at moderate RH the transpiration rate, stomatal conductance and aperture of high RH grown plants measured at the same condition (40% RH) were, respectively, 112, 139 and 132% in light and 141, 188 and 370% in darkness”
t0“Tradescantia virginiana”
Claim · model-written summary
In darkness, stomatal conductance was 188% of moderate humidity plants.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Outcome
- stomatal conductancee0
- Direction
- higherinferrede0
- Value
- 188e0
- Qualifier
- in darknesse0
- Comparator
- moderate RHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with plants grown at moderate RH the transpiration rate, stomatal conductance and aperture of high RH grown plants measured at the same condition (40% RH) were, respectively, 112, 139 and 132% in light and 141, 188 and 370% in darkness”
t0“Tradescantia virginiana”
Claim · model-written summary
In darkness, stomatal aperture was 370% of moderate humidity plants.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Outcome
- aperturee0
- Direction
- higherinferrede0
- Value
- 370%e0
- Qualifier
- in darknesse0
- Comparator
- moderate RHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with plants grown at moderate RH the transpiration rate, stomatal conductance and aperture of high RH grown plants measured at the same condition (40% RH) were, respectively, 112, 139 and 132% in light and 141, 188 and 370% in darkness”
t0“Tradescantia virginiana”
Claim · model-written summary
Guard cells were longer in high humidity plants.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Outcome
- guard cell lengthe0
- Direction
- higherinferrede0
- Value
- 73.3 µme0
- Qualifier
- 56.7e0
- Comparator
- moderatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“guard cell length was 56.7 and 73.3 µm for moderate and high RH grown plants, respectively”
t0“Tradescantia virginiana”
Claim · model-written summary
Stomata responded to desiccation, ABA and darkness in both humidity groups.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Outcome
- stomata responded to desiccation, ABA and darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomata responded to desiccation, ABA and darkness in both moderate and high RH grown plants”
t0“Tradescantia virginiana”
Claim · model-written summary
High humidity plants varied markedly in stomatal closure.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Outcome
- high variability of stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the high variability of stomatal closure in high RH grown plants was striking”
t0“Tradescantia virginiana”
Claim · model-written summary
Some high humidity stomata closed fully but others only partly or not at all.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Outcome
- others closed only partly or did not close at alle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some stomata developed at high RH closed in response to darkness or to a decrease in relative water content to the same extent as did stomata from moderate RH grown plants, whereas others closed only partly or did not close at all”
t0“Tradescantia virginiana”
Claim · model-written summary
Incomplete closure after ABA suggests ABA deficiency does not explain desiccation response.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Outcome
- lack of stomatal closure in response to desiccatione0
- Qualifier
- ABA deficiency was not responsiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The failure of some stomata to close fully in response to ABA suggests that ABA deficiency was not responsible for the lack of stomatal closure in response to desiccation”
t0“Tradescantia virginiana”
The same questions in other papers
humidity · physiology: gas exchange · Tradescantia virginiana (Virginia spiderwort)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.