Abstract
Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief. RWC decreased sharply as drought progressed. Following rewatering, RWC gradually increased to pre-stress values. A, stomatal conductance (gs), mesophyll conductance (gm), total conductance (gt), and PRI changed in parallel with RWC. A decrease in A resulted from coordinated suppression in leaf conductance. As water stress progressed, A measured in non-photorespiratory conditions (A1%O2) became more than 3 times higher compared to that recorded at 21% [O2], indicating that photorespiration likely increased in response to water stress. A1%O2 was significantly correlated with all leaf conductances. A1%O2 was limited more by gs than by gm, indicating that higher gm favors photosynthesis over photorespiration. There was a significant linear correlation between RWC and PRI. Significant non-linear relationships were also found both between PRI and A and PRI and gt. These data imply that PRI may clearly detect normal and stressed status of holm oak, but it is not very informative when plants are severely stressed. Overall, our data indicate that: a) PRI is an important indicator of leaf water status as evident from RWC; b) because leaf conductance did not limit photosynthesis when photorespiration was suppressed, holm oak, and in general sclerophyllous species, will respond to future elevated [CO2] significantly more than mesophyllous plants; c) PRI can be used to predict changes in the performance of holm oak subjected to physiological water stress, whereas caution is needed under severe drought. © 2014 Friends Science Publishers
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Claims 16
Claim · model-written summary
Relative water content of holm oak decreased sharply as drought progressed.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“RWC decreased sharply as drought progressed”
Claim · model-written summary
After rewatering, relative water content of holm oak gradually increased back to pre-stress values.
- Taxon
- Quercus ilex
Quercus ilexe0 - Treatment
- rewateringe1
- Outcome
- RWCe1
- Direction
- increasede1
- Qualifier
- graduallye1
- Comparator
- pre-stress valuese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“Following rewatering, RWC gradually increased to pre-stress values”
Claim · model-written summary
Net photosynthesis, stomatal conductance and mesophyll conductance of holm oak changed in parallel with relative water content; the direction is not stated.
- Taxon
- Quercus ilexQuercus ilexe0
- Outcome
- A, stomatal conductance (gs), mesophyll conductance (gm)e1
- Comparator
- RWCe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“A, stomatal conductance (gs), mesophyll conductance (gm), total conductance (gt), and PRI changed in parallel with RWC”
Claim · model-written summary
Total conductance and PRI of holm oak changed in parallel with relative water content; the direction is not stated.
- Taxon
- Quercus ilexQuercus ilexe0
- Outcome
- total conductance (gt), and PRIe1
- Comparator
- RWCe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“A, stomatal conductance (gs), mesophyll conductance (gm), total conductance (gt), and PRI changed in parallel with RWC”
Claim · model-written summary
A decrease in photosynthesis in holm oak resulted from coordinated suppression of leaf conductance.
- Taxon
- Quercus ilexQuercus ilexe0
- Outcome
- decrease in Ae1
- Qualifier
- coordinated suppression in leaf conductancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“A decrease in A resulted from coordinated suppression in leaf conductance”
Claim · model-written summary
Under water stress, photosynthesis measured without photorespiration (1% O2) in holm oak became more than 3 times higher than at 21% O2.
- Taxon
- Quercus ilexQuercus ilexe0
- Treatment
- water stresse1
- Outcome
- A measured in non-photorespiratory conditions (A1%O2)e1
- Direction
- highere1
- Value
- more than 3 timese1
- Comparator
- 21% [O2]e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“As water stress progressed, A measured in non-photorespiratory conditions (A1%O2) became more than 3 times higher compared to that recorded at 21% [O2], indicating that photorespiration likely increased in response to water stress”
Claim · model-written summary
Photorespiration in holm oak likely increased in response to water stress.
- Taxon
- Quercus ilexQuercus ilexe0
- Treatment
- water stresse1
- Outcome
- photorespiratione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“As water stress progressed, A measured in non-photorespiratory conditions (A1%O2) became more than 3 times higher compared to that recorded at 21% [O2], indicating that photorespiration likely increased in response to water stress”
Claim · model-written summary
Photosynthesis without photorespiration (A1%O2) in holm oak was significantly correlated with all leaf conductances.
- Taxon
- Quercus ilexQuercus ilexe0
- Outcome
- A1%O2e1
- Comparator
- all leaf conductancese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“A1%O2 was significantly correlated with all leaf conductances”
Claim · model-written summary
Photosynthesis without photorespiration (A1%O2) in holm oak was more limited by stomatal conductance (gs) than by mesophyll conductance (gm).
- Taxon
- Quercus ilexQuercus ilexe0
- Outcome
- A1%O2e1
- Comparator
- gme1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“A1%O2 was limited more by gs than by gm, indicating that higher gm favors photosynthesis over photorespiration”
Claim · model-written summary
Higher mesophyll conductance favours photosynthesis over photorespiration in holm oak.
- Taxon
- Quercus ilexQuercus ilexe0
- Outcome
- photosynthesis over photorespiratione1
- Qualifier
- higher gme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“A1%O2 was limited more by gs than by gm, indicating that higher gm favors photosynthesis over photorespiration”
Claim · model-written summary
Relative water content and PRI of holm oak were significantly linearly correlated.
- Taxon
- Quercus ilexQuercus ilexe0
- Outcome
- linear correlation between RWC and PRIe1
- Comparator
- RWCe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“There was a significant linear correlation between RWC and PRI”
Claim · model-written summary
PRI and photosynthesis, and PRI and total conductance of holm oak, were related by significant non-linear relationships.
- Taxon
- Quercus ilexQuercus ilexe0
- Outcome
- non-linear relationshipse1
- Comparator
- PRIe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diffusional limitations to photosynthesis (A), relative water content (RWC) and their association with photochemical reflectance index (PRI) were studied in holm oak (Quercus ilex L.) saplings subjected to water stress and subsequent water stress relief”
e1“Significant non-linear relationships were also found both between PRI and A and PRI and gt”
Claim · model-written summary
PRI may clearly detect normal and stressed status of holm oak, but is not very informative when plants are severely stressed.
Verbatim
e1“PRI may clearly detect normal and stressed status of holm oak, but it is not very informative when plants are severely stressed”
Claim · model-written summary
The authors state that PRI is an important indicator of leaf water status in holm oak, as evident from relative water content.
Verbatim
e1“PRI is an important indicator of leaf water status as evident from RWC”
Claim · model-written summary
Holm oak would respond to future elevated CO2 significantly more than mesophyllous plants, because its leaf conductance does not limit photosynthesis when photorespiration is suppressed.
Verbatim
e1“because leaf conductance did not limit photosynthesis when photorespiration was suppressed, holm oak, and in general sclerophyllous species, will respond to future elevated [CO2] significantly more than mesophyllous plants”
Claim · model-written summary
PRI can be used to predict changes in the performance of holm oak under physiological water stress, with caution needed under severe drought.
- Outcome
- predict changes in the performance of holm oake1
- Qualifier
- caution is needed under severe droughte1
Not reportedComparator
Verbatim
e1“PRI can be used to predict changes in the performance of holm oak subjected to physiological water stress, whereas caution is needed under severe drought”
The same questions in other papers
drought · physiology: water · Quercus ilex (holly oak)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
1 paper more in this group
See all 5 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.