Abstract
In this study, the role of abscisic acid (ABA) in altered stomatal responses of Tradescantia virginiana leaves grown at high relative air humidity (RH) was investigated. A lower ABA concentration was found in leaves grown at high RH compared with leaves grown at moderate RH. As a result of a daily application of 20 microM ABA to leaves for 3 weeks during growth at high RH, the stomata of ABA-treated leaves grown at high RH showed the same behaviour as did the stomata of leaves grown at moderate RH. For example, they closed rapidly when exposed to desiccation. Providing a high RH around a single leaf of a plant during growth at moderate RH changed the stomatal responses of this leaf. The stomata in this leaf grown at high RH did not close completely in response to desiccation in contrast to the stomata of the other leaves from the same plant. The ABA concentration on a fresh weight basis, though not on a dry weight basis, of this leaf was significantly lower than that of the others. Moreover, less closure of stomata was found in the older leaves of plants grown at high RH in response to desiccation compared with younger leaves. This was correlated with a lower ABA concentration in these leaves on a fresh weight basis, though not on a dry weight basis. Stomata of leaves grown at moderate RH closed in response to short-term application of ABA or sodium nitroprusside (SNP), while for leaves grown at high RH there was a clear difference in stomatal responses between the leaf margins and main-vein areas. The stomatal aperture in response to short-term application of ABA or SNP at the leaf margins of leaves grown at high RH remained significantly wider than in the main-vein areas. It was concluded that: (i) a long-term low ABA concentration in well-watered plants during growth at high RH could be a reason for less or no stomatal closure under conditions of drought stress; and (ii) the long-term ABA concentration on a fresh weight basis rather than on a dry weight basis is likely to be responsible for structural or physiological changes in stomata during leaf growth.
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Claims 12
Claim · model-written summary
Leaves grown at high RH had lower ABA concentration than those grown at moderate RH.
- Taxon
- Tradescantia virginiana
Tradescantia virginianat0 - Organ / stage
- leaves grown at high RHe0
- Outcome
- ABA concentratione0
- Direction
- lowere0
- Comparator
- leaves grown at moderate RHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“A lower ABA concentration was found in leaves grown at high RH compared with leaves grown at moderate RH.”
Claim · model-written summary
Daily ABA application during high-RH growth restored stomatal behaviour resembling moderate-RH leaves.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Organ / stage
- stomatae0
- Treatment
- daily application of 20 microM ABAe0
- Outcome
- stomata of ABA-treated leaves grown at high RH showed the same behavioure0
- Direction
- same behavioure0
- Comparator
- leaves grown at moderate RHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“a daily application of 20 microM ABA to leaves for 3 weeks during growth at high RH, the stomata of ABA-treated leaves grown at high RH showed the same behaviour as did the stomata of leaves grown at moderate RH”
Claim · model-written summary
ABA-treated high-RH stomata closed rapidly under desiccation.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- desiccatione0
- Outcome
- closed rapidlye0
- Direction
- rapidlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“they closed rapidly when exposed to desiccation”
Claim · model-written summary
A single leaf grown at high RH did not fully close stomata under desiccation compared with other leaves on that plant.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Organ / stage
- leafe0
- Treatment
- high RHe0
- Outcome
- stomatae0
- Direction
- did not close completelye0
- Comparator
- other leaves from the same plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“The stomata in this leaf grown at high RH did not close completely in response to desiccation in contrast to the stomata of the other leaves from the same plant.”
Claim · model-written summary
The high-RH single leaf had significantly lower fresh-weight ABA concentration than other leaves, but not lower dry-weight concentration.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Outcome
- ABA concentration on a fresh weight basise0
- Direction
- lowere0
- Qualifier
- though not on a dry weight basise0
- Comparator
- the otherse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“The ABA concentration on a fresh weight basis, though not on a dry weight basis, of this leaf was significantly lower than that of the others.”
Claim · model-written summary
Older high-RH leaves had less stomatal closure under desiccation than younger leaves.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Organ / stage
- older leavese0
- Outcome
- closure of stomatae0
- Direction
- lesse0
- Comparator
- younger leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“less closure of stomata was found in the older leaves of plants grown at high RH in response to desiccation compared with younger leaves”
Claim · model-written summary
Reduced closure in older high-RH leaves correlated with lower fresh-weight ABA concentration.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Organ / stage
- these leavese0
- Outcome
- ABA concentratione0
- Direction
- lowere0
- Qualifier
- though not on a dry weight basise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“This was correlated with a lower ABA concentration in these leaves on a fresh weight basis, though not on a dry weight basis.”
Claim · model-written summary
Moderate-RH stomata closed after short-term ABA application.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Organ / stage
- leaves grown at moderate RHe0
- Treatment
- short-term application of ABAe0
- Outcome
- Stomatae0
- Direction
- closede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“Stomata of leaves grown at moderate RH closed in response to short-term application of ABA or sodium nitroprusside (SNP)”
Claim · model-written summary
Moderate-RH stomata closed after short-term SNP application.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Organ / stage
- leaves grown at moderate RHe0
- Treatment
- sodium nitroprusside (SNP)e0
- Outcome
- Stomatae0
- Direction
- closede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“Stomata of leaves grown at moderate RH closed in response to short-term application of ABA or sodium nitroprusside (SNP)”
Claim · model-written summary
After short-term ABA or SNP, high-RH leaf-margin stomatal apertures remained significantly wider than main-vein apertures.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Organ / stage
- leaf marginse0
- Treatment
- short-term application of ABA or SNPe0
- Outcome
- stomatal aperturee0
- Direction
- widere0
- Comparator
- main-vein arease0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“The stomatal aperture in response to short-term application of ABA or SNP at the leaf margins of leaves grown at high RH remained significantly wider than in the main-vein areas.”
Claim · model-written summary
The authors infer prolonged low ABA under high RH may explain limited stomatal closure during drought.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Treatment
- high RHe0
- Compound
- ABAe0
- Outcome
- less or no stomatal closuree0
- Qualifier
- could be a reasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“a long-term low ABA concentration in well-watered plants during growth at high RH could be a reason for less or no stomatal closure under conditions of drought stress”
Claim · model-written summary
The authors infer fresh-weight rather than dry-weight ABA concentration may drive stomatal changes during leaf growth.
- Taxon
- Tradescantia virginianaTradescantia virginianat0
- Organ / stage
- leaf growthe0
- Compound
- ABAe0
- Outcome
- structural or physiological changes in stomatae0
- Qualifier
- is likely to be responsiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tradescantia virginiana”
e0“the long-term ABA concentration on a fresh weight basis rather than on a dry weight basis is likely to be responsible for structural or physiological changes in stomata during leaf growth”
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.