Abstract
The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1). Detached leaves of w-1 strongly dehydrated during the first 30 min without significant changes in leaf conductance, whereas W-1 responded rapidly to water loss by reducing stomatal aperture. After 2 h stress ABA increased slightly in w-1, while W-1 leaves showed a 20-fold increase. When water stress was imposed to potted plants by water withholding, w-1 quickly dehydrated, and lost turgor, while W-1 maintained positive turgor values for a longer period. Wild-type plants responded to small changes in leaf water potential by accumulating ABA and by closing stomata, whereas in the mutant significant changes in ABA content and in stomatal conductance were found only at very low water potentials. In another experiment in which water was withheld under high relative humidity, when soil water content started to decrease W-1 rapidly closed stomata in the absence of any change in leaf water status and the reduction in conductance was paralleled by a rise in xylem sap ABA concentration. By contrast the mutant started to accumulate ABA in the xylem sap and to close stomata when soil water content and leaf water potential were dramatically reduced. The low endogenous ABA levels and the inability to synthesize the hormone rapidly either in the leaves or in the roots seem to be responsible for the high sensitivity of w-1 to water stress.
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Claims 13
Claim · model-written summary
The w-1 mutant leaves showed no significant change in leaf conductance during detached-leaf dehydration
- Taxon
- sunflower
Helianthus annuuse1 - Material
- w-1e0
- Treatment
- water stresse1
- Outcome
- leaf conductancee0
- Direction
- no_changeinferrede0
- Comparator
- W-1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Detached leaves of w-1 strongly dehydrated during the first 30 min without significant changes in leaf conductance”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
Detached w-1 leaves dehydrated strongly during the first 30 min
- Taxon
- sunflowerHelianthus annuuse1
- Material
- w-1e0
- Treatment
- Detached leavese0
- Outcome
- dehydratede0
- Direction
- increaseinferrede0
- Comparator
- W-1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Detached leaves of w-1 strongly dehydrated during the first 30 min without significant changes in leaf conductance”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
W-1 reduced stomatal aperture rapidly in response to water loss
- Taxon
- sunflowerHelianthus annuuse1
- Material
- W-1e0
- Treatment
- water losse0
- Outcome
- stomatal aperturee0
- Direction
- reducinge0
- Comparator
- w-1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas W-1 responded rapidly to water loss by reducing stomatal aperture”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
ABA increased slightly in w-1 leaves after 2 h of stress
- Taxon
- sunflowerHelianthus annuuse1
- Material
- w-1e0
- Treatment
- 2 h stresse0
- Outcome
- ABAe0
- Direction
- increasede0
- Qualifier
- slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 2 h stress ABA increased slightly in w-1, while W-1 leaves showed a 20-fold increase”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
ABA increased 20-fold in W-1 leaves after 2 h of stress
- Taxon
- sunflowerHelianthus annuuse1
- Material
- W-1e0
- Organ / stage
- leavese0
- Treatment
- 2 h stresse0
- Outcome
- ABAe0
- Direction
- increasee0
- Value
- 20-folde0
- Comparator
- w-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 2 h stress ABA increased slightly in w-1, while W-1 leaves showed a 20-fold increase”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
Potted w-1 plants dehydrated quickly and lost turgor under water withholding
- Taxon
- sunflowerHelianthus annuuse1
- Material
- w-1e0
- Treatment
- water withholdinge0
- Outcome
- turgore0
- Direction
- decreaseinferrede0
- Comparator
- W-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When water stress was imposed to potted plants by water withholding, w-1 quickly dehydrated, and lost turgor, while W-1 maintained positive turgor values for a longer period”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
W-1 maintained positive turgor for a longer period under water withholding
- Taxon
- sunflowerHelianthus annuuse1
- Material
- W-1e0
- Treatment
- water withholdinge0
- Outcome
- turgore0
- Direction
- no_changeinferrede0
- Qualifier
- for a longer periode0
- Comparator
- w-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When water stress was imposed to potted plants by water withholding, w-1 quickly dehydrated, and lost turgor, while W-1 maintained positive turgor values for a longer period”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
Wild-type plants accumulated ABA in response to small changes in leaf water potential
- Taxon
- sunflowerHelianthus annuuse1
- Material
- Wild-type plantse0
- Treatment
- small changes in leaf water potentiale0
- Outcome
- ABAe0
- Direction
- increaseinferrede0
- Comparator
- the mutante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wild-type plants responded to small changes in leaf water potential by accumulating ABA and by closing stomata, whereas in the mutant significant changes in ABA content and in stomatal conductance were found only at very low water potentials”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
The mutant changed ABA content and stomatal conductance only at very low water potentials
- Taxon
- sunflowerHelianthus annuuse1
- Material
- mutante0
- Treatment
- very low water potentialse0
- Outcome
- stomatal conductancee0
- Comparator
- Wild-type plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wild-type plants responded to small changes in leaf water potential by accumulating ABA and by closing stomata, whereas in the mutant significant changes in ABA content and in stomatal conductance were found only at very low water potentials”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
W-1 reduced conductance rapidly under high humidity when soil water declined, without leaf water change
- Taxon
- sunflowerHelianthus annuuse1
- Material
- W-1e0
- Treatment
- water was withheld under high relative humiditye0
- Outcome
- conductancee0
- Direction
- decreaseinferrede0
- Qualifier
- in the absence of any change in leaf water statuse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In another experiment in which water was withheld under high relative humidity, when soil water content started to decrease W-1 rapidly closed stomata in the absence of any change in leaf water status and the reduction in conductance was paralleled by a rise in xylem sap ABA concentration”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
Conductance reduction in W-1 was paralleled by a rise in xylem sap ABA concentration
- Taxon
- sunflowerHelianthus annuuse1
- Treatment
- water was withheld under high relative humiditye0
- Outcome
- xylem sap ABA concentratione0
- Direction
- increaseinferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In another experiment in which water was withheld under high relative humidity, when soil water content started to decrease W-1 rapidly closed stomata in the absence of any change in leaf water status and the reduction in conductance was paralleled by a rise in xylem sap ABA concentration”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
Claim · model-written summary
The mutant accumulated ABA in xylem sap only when soil and leaf water potential were dramatically reduced
- Taxon
- sunflowerHelianthus annuuse1
- Material
- mutante0
- Treatment
- soil water content and leaf water potential were dramatically reducede0
- Outcome
- ABA in the xylem sape0
- Direction
- increaseinferrede0
- Comparator
- W-1e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By contrast the mutant started to accumulate ABA in the xylem sap and to close stomata when soil water content and leaf water potential were dramatically reduced”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
e2“In another experiment in which water was withheld under high relative humidity, when soil water content started to decrease W-1 rapidly closed stomata in the absence of any change in leaf water status and the reduction in conductance was paralleled by a rise in xylem sap ABA concentration”
Claim · model-written summary
Low endogenous ABA and slow ABA synthesis appear to explain the high sensitivity of w-1 to water stress
- Taxon
- sunflowerHelianthus annuuse1
- Compound
- ABAe0
- Outcome
- high sensitivity of w-1 to water stresse0
- Qualifier
- the inability to synthesize the hormone rapidlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The low endogenous ABA levels and the inability to synthesize the hormone rapidly either in the leaves or in the roots seem to be responsible for the high sensitivity of w-1 to water stress”
e1“The response of w-1, a wilty sunflower (Helianthus annuus L.) mutant, to water stress is described in comparison with the control line (W-1)”
The same questions in other papers
drought · physiology: water · Helianthus annuus (common sunflower)Results differ
7 papers in the same direction as this paper · 21 in the opposite direction
- negative
- negative
- negative
25 papers more in this group
See all 29 papers →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.