Abstract
Potted 1·5-year-old apricot plants ( Prunus armeniaca L.), growing under polycarbonate glasshouse conditions with a cooling system, were subjected to two successive water stress/recovery periods until pre-dawn leaf water potential (Ψ pd ) reached values between −2·0 and −2·5 MPa, during summer 1996. Control plants were irrigated daily to maintain the soil matric potential at c . −20 kPa. Water stress limited plant growth and induced a significant reduction in leaf area, caused by mature leaf abscission. The parallel behaviour of leaf turgor potential and epinasty in stressed plants indicated that these movements are turgor-dependent. Osmotic adjustments of 0·27 and 0·60 MPa were observed at the end of the first and second stress period, respectively. Relative apoplastic water content (RWC a ) values were high, ranging from 27 to 42%, and were not affected by water stress. The rapid decrease in leaf conductance (g l ) from the beginning of the stress periods, together with the delay in stomatal reopening after rewatering the plants, indicated that stomatal behaviour was not a simple passive response to water deficits. Net photosynthesis decreased only at the end of both stress periods and recovered quickly. These observations indicate that leaf productivity may be affected only slightly by short-term water stress. The results indicate that drought resistance in apricot is based mainly on avoidance mechanisms, such as stomatal control, epinasty and limitation of transpiration by reducing leaf area. However, some tolerance characteristics, including osmotic adjustment, high RWC a and low leaf osmotic potential at turgor loss point (Ψ tlp ) values were observed.
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Claims 15
Claim · model-written summary
Water stress reduced plant growth.
- Taxon
- apricot
Prunus armeniacat0 - Treatment
- Water stresse0
- Outcome
- plant growthe0
- Direction
- limitede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress limited plant growth and induced a significant reduction in leaf area, caused by mature leaf abscission.”
t0“young apricot plants”
Claim · model-written summary
Water stress reduced leaf area.
- Taxon
- apricotPrunus armeniacat0
- Organ / stage
- mature leafe0
- Treatment
- Water stresse0
- Outcome
- leaf areae0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress limited plant growth and induced a significant reduction in leaf area, caused by mature leaf abscission.”
t0“young apricot plants”
Claim · model-written summary
Parallel leaf turgor and epinasty indicated turgor-dependent movement.
- Taxon
- apricotPrunus armeniacat0
- Organ / stage
- leafe0
- Outcome
- epinastye0
- Qualifier
- turgor-dependente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The parallel behaviour of leaf turgor potential and epinasty in stressed plants indicated that these movements are turgor-dependent.”
t0“young apricot plants”
Claim · model-written summary
Osmotic adjustment was 0·27 after the first stress period.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- Osmotic adjustmentse0
- Value
- 0·27e0
- Qualifier
- firste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic adjustments of 0·27 and 0·60 MPa were observed at the end of the first and second stress period, respectively.”
t0“young apricot plants”
Claim · model-written summary
Osmotic adjustment was 0·60 MPa after the second stress period.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- Osmotic adjustmentse0
- Value
- 0·60 MPae0
- Qualifier
- seconde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic adjustments of 0·27 and 0·60 MPa were observed at the end of the first and second stress period, respectively.”
t0“young apricot plants”
Claim · model-written summary
Relative apoplastic water content ranged from 27 to 42%.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- Relative apoplastic water content (RWC a )e0
- Value
- 27 to 42%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative apoplastic water content (RWC a ) values were high, ranging from 27 to 42%, and were not affected by water stress.”
t0“young apricot plants”
Claim · model-written summary
Water stress did not affect relative apoplastic water content.
- Taxon
- apricotPrunus armeniacat0
- Treatment
- water stresse0
- Outcome
- Relative apoplastic water content (RWC a )e0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative apoplastic water content (RWC a ) values were high, ranging from 27 to 42%, and were not affected by water stress.”
t0“young apricot plants”
Claim · model-written summary
Leaf conductance decreased rapidly from the start of stress.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- leaf conductance (g l )e0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rapid decrease in leaf conductance (g l ) from the beginning of the stress periods, together with the delay in stomatal reopening after rewatering the plants, indicated that stomatal behaviour was not a simple passive response to water deficits.”
t0“young apricot plants”
Claim · model-written summary
Stomatal reopening was delayed after rewatering.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- stomatal reopeninge0
- Direction
- delaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rapid decrease in leaf conductance (g l ) from the beginning of the stress periods, together with the delay in stomatal reopening after rewatering the plants, indicated that stomatal behaviour was not a simple passive response to water deficits.”
t0“young apricot plants”
Claim · model-written summary
Stomatal behavior was interpreted as more than a passive response to water deficit.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- stomatal behavioure0
- Qualifier
- not a simple passive response to water deficitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rapid decrease in leaf conductance (g l ) from the beginning of the stress periods, together with the delay in stomatal reopening after rewatering the plants, indicated that stomatal behaviour was not a simple passive response to water deficits.”
t0“young apricot plants”
Claim · model-written summary
Net photosynthesis decreased only at the end of both stress periods.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- Net photosynthesise0
- Direction
- decreasede0
- Qualifier
- only at the end of both stress periodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net photosynthesis decreased only at the end of both stress periods and recovered quickly.”
t0“young apricot plants”
Claim · model-written summary
Net photosynthesis recovered quickly after stress.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- Net photosynthesise0
- Direction
- recovered quicklye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net photosynthesis decreased only at the end of both stress periods and recovered quickly.”
t0“young apricot plants”
Claim · model-written summary
Short-term water stress may only slightly affect leaf productivity.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- leaf productivitye0
- Direction
- affected only slightlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These observations indicate that leaf productivity may be affected only slightly by short-term water stress.”
t0“young apricot plants”
Claim · model-written summary
Apricot drought resistance was attributed mainly to stomatal control, epinasty and reduced leaf area limiting transpiration.
- Taxon
- apricotPrunus armeniacae0
- Outcome
- drought resistancee0
- Qualifier
- stomatal control, epinasty and limitation of transpiration by reducing leaf areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicate that drought resistance in apricot is based mainly on avoidance mechanisms, such as stomatal control, epinasty and limitation of transpiration by reducing leaf area.”
Claim · model-written summary
Apricot also showed osmotic adjustment, high RWC a and low leaf osmotic potential at turgor loss.
- Taxon
- apricotPrunus armeniacat0
- Outcome
- osmotic adjustment, high RWC a and low leaf osmotic potential at turgor loss point (Ψ tlp ) valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, some tolerance characteristics, including osmotic adjustment, high RWC a and low leaf osmotic potential at turgor loss point (Ψ tlp ) values were observed.”
t0“young apricot plants”
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See all 6 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.