Abstract
The present study was conducted to evaluate phenotypic interaction in reciprocal grafts between wilty (w-1) sunflower mutant and normal (W-1) plants. The w-1 genotype is a ‘leaky’ ABA-deficient mutant, characterized by high stomatal conductance, in both light and dark conditions, and high transpiration rate. In well-watered conditions, mutant scions grafted on to normal rootstock (w-1/W-1) showed higher leaf relative water content, leaf water potential and ABA levels than those of control grafts (w-1/w-1). In addition, detached leaves of w-1/W-1 exhibited lower water loss than w-1/w-1 grafts, while mutant rootstock did not affect the transpiration rate of detached W-1 leaves. When drought stress was imposed to potted plants by withholding water, the mutant scions grafted on to normal roots showed a partial phenotypic reversion. A rapid stomatal closure and a rise in ABA levels in response to a small decrease in leaf water potential was observed. By contrast, in w-1/w-1 grafts significant reductions in stomatal conductance and ABA accumulation were detected only in conjunction with a severe water deficit. W-1 scions on mutant stocks (W-1/w-1) maintained the normal phenotype of control wild-type grafts (W1/W-1).
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Claims 8
Claim · model-written summary
In well-watered conditions, mutant scions on normal rootstock had higher leaf relative water content, leaf water potential and ABA levels than control grafts.
- Taxon
- sunflower
Helianthus annuust0 - Material
- w-1e1
- Treatment
- mutant scions grafted on to normal rootstocke1
- Outcome
- leaf relative water content, leaf water potential and ABA levelse1
- Direction
- highere1
- Qualifier
- well-watered conditionse1
- Comparator
- control grafts (w-1/w-1)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wilty sunflower (Helianthus annuusL.) mutant”
e1“In well-watered conditions, mutant scions grafted on to normal rootstock (w-1/W-1) showed higher leaf relative water content, leaf water potential and ABA levels than those of control grafts (w-1/w-1)”
Claim · model-written summary
Detached leaves of w-1/W-1 grafts lost less water than w-1/w-1 grafts.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- detached leavese2
- Treatment
- w-1/W-1e2
- Outcome
- water losse2
- Direction
- lowere2
- Comparator
- w-1/w-1 graftse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wilty sunflower (Helianthus annuusL.) mutant”
e2“detached leaves of w-1/W-1 exhibited lower water loss than w-1/w-1 grafts”
Claim · model-written summary
Mutant rootstock did not affect the transpiration rate of detached W-1 leaves.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- mutant rootstocke3
- Outcome
- transpiration rate of detached W-1 leavese3
- Direction
- did not affecte3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wilty sunflower (Helianthus annuusL.) mutant”
e3“mutant rootstock did not affect the transpiration rate of detached W-1 leaves”
Claim · model-written summary
W-1 scions on mutant stocks maintained the normal phenotype of control wild-type grafts.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- mutant stocks (W-1/w-1)e4
- Outcome
- normal phenotypee4
- Direction
- maintainede4
- Comparator
- control wild-type grafts (W1/W-1)e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wilty sunflower (Helianthus annuusL.) mutant”
e4“W-1 scions on mutant stocks (W-1/w-1) maintained the normal phenotype of control wild-type grafts (W1/W-1)”
Claim · model-written summary
Under drought stress, mutant scions grafted on normal roots showed a partial phenotypic reversion.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- drought stresse5
- Outcome
- partial phenotypic reversione5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wilty sunflower (Helianthus annuusL.) mutant”
e5“When drought stress was imposed to potted plants by withholding water, the mutant scions grafted on to normal roots showed a partial phenotypic reversion”
Claim · model-written summary
A rapid stomatal closure occurred in response to a small decrease in leaf water potential.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- a small decrease in leaf water potentiale6
- Outcome
- stomatal closuree6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wilty sunflower (Helianthus annuusL.) mutant”
e6“A rapid stomatal closure and a rise in ABA levels in response to a small decrease in leaf water potential was observed”
Claim · model-written summary
A rise in ABA levels occurred in response to a small decrease in leaf water potential.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- a small decrease in leaf water potentiale6
- Outcome
- ABA levelse6
- Direction
- risee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wilty sunflower (Helianthus annuusL.) mutant”
e6“A rapid stomatal closure and a rise in ABA levels in response to a small decrease in leaf water potential was observed”
Claim · model-written summary
In w-1/w-1 grafts, significant reductions in stomatal conductance and ABA accumulation were detected only with a severe water deficit.
- Taxon
- sunflowerHelianthus annuust0
- Material
- w-1/w-1 graftse7
- Treatment
- severe water deficite7
- Outcome
- stomatal conductance and ABA accumulatione7
- Direction
- reductionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wilty sunflower (Helianthus annuusL.) mutant”
e7“in w-1/w-1 grafts significant reductions in stomatal conductance and ABA accumulation were detected only in conjunction with a severe water deficit”