Abstract
The interactive effects of shade and drought on different morphological and physiological traits were addressed on Quercus suber L. seedlings. In our experiment, limited light treatment (1 per cent) represented the main factor constraining cork oak seedlings growth. Maximal photochemical efficiency (Fv/Fm) with light ≥15 per cent exhibited a midday fall, but under deep shade (1 per cent), Fv/Fm remained constant (<0.8 values) throughout the day. The quantum efficiency of photosystem II (PSII) was lower under moderate drought only in deeply shaded plants. The drought also interacted with light through the increase of the soluble sugar content at 100 per cent light, but not under shade. Under deep shade, soluble sugar content tended to be even lower under moderate drought conditions. The chlorophyll content was not the highest under deep shade as could be expected, while the efficiency of PSII was the lowest under deep shade. We concluded that cork oak can acclimate to moderate shade (15 per cent light), but deep shade impairs some of the physiological responses to cope with low light conditions under moderate drought stress. Plants growing under deep shade were very sensitive to moderate water stress in terms of loss of carbon fixation capacity.
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Claims 11
Claim · model-written summary
One percent light constrained cork oak seedling growth.
- Taxon
- Quercus suber L.
Quercus subert0 - Treatment
- limited light treatment (1 per cent)e0
- Outcome
- cork oak seedlings growthe0
- Direction
- constraininge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limited light treatment (1 per cent) represented the main factor constraining cork oak seedlings growth.”
t0“Quercus suber L.”
Claim · model-written summary
At light levels of at least 15 percent, Fv/Fm fell at midday.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- light ≥15 per cente0
- Outcome
- Maximal photochemical efficiency (Fv/Fm)e0
- Direction
- falle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximal photochemical efficiency (Fv/Fm) with light ≥15 per cent exhibited a midday fall”
t0“Quercus suber L.”
Claim · model-written summary
Under one percent light, Fv/Fm remained constant below 0.8 throughout the day.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- deep shade (1 per cent)e0
- Outcome
- Fv/Fme0
- Direction
- remained constante0
- Value
- <0.8 valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under deep shade (1 per cent), Fv/Fm remained constant (<0.8 values) throughout the day.”
t0“Quercus suber L.”
Claim · model-written summary
Moderate drought lowered PSII quantum efficiency only under deep shade.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- moderate droughte0
- Outcome
- quantum efficiency of photosystem II (PSII)e0
- Direction
- lowere0
- Qualifier
- only in deeply shaded plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The quantum efficiency of photosystem II (PSII) was lower under moderate drought only in deeply shaded plants.”
t0“Quercus suber L.”
Claim · model-written summary
Drought increased soluble sugar content under full light.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- droughte0
- Outcome
- soluble sugar contente0
- Direction
- increasee0
- Qualifier
- at 100 per cent lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The drought also interacted with light through the increase of the soluble sugar content at 100 per cent light, but not under shade.”
t0“Quercus suber L.”
Claim · model-written summary
Under shade, drought did not increase soluble sugar content.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- droughte0
- Outcome
- soluble sugar contente0
- Direction
- not under shadee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The drought also interacted with light through the increase of the soluble sugar content at 100 per cent light, but not under shade.”
t0“Quercus suber L.”
Claim · model-written summary
Moderate drought tended to lower soluble sugar content under deep shade.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- moderate drought conditionse0
- Outcome
- soluble sugar contente0
- Direction
- lowere0
- Qualifier
- tended to bee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under deep shade, soluble sugar content tended to be even lower under moderate drought conditions.”
t0“Quercus suber L.”
Claim · model-written summary
Chlorophyll content was not highest under deep shade.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- deep shadee0
- Outcome
- chlorophyll contente0
- Direction
- not the higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chlorophyll content was not the highest under deep shade as could be expected”
t0“Quercus suber L.”
Claim · model-written summary
PSII efficiency was lowest under deep shade.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- deep shadee0
- Outcome
- efficiency of PSIIe0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the efficiency of PSII was the lowest under deep shade.”
t0“Quercus suber L.”
Claim · model-written summary
Cork oak could acclimate to moderate shade at 15 percent light.
- Taxon
- cork oakQuercus subere0
- Outcome
- acclimate to moderate shade (15 per cent light)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cork oak can acclimate to moderate shade (15 per cent light)”
Claim · model-written summary
Deep shade impaired physiological responses to moderate drought and reduced carbon fixation capacity.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- deep shadee0
- Outcome
- carbon fixation capacitye0
- Direction
- losse0
- Qualifier
- moderate water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants growing under deep shade were very sensitive to moderate water stress in terms of loss of carbon fixation capacity.”
t0“Quercus suber L.”
The same questions in other papers
drought · physiology: osmolytes · Quercus suber (cork oak)Positive and negative results
1 in the opposite direction
- positive
light · growth · Quercus suber (cork oak)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
drought · physiology: photosynthesis · Quercus suber (cork oak)Results agree
5 papers in the same direction as this paper
- negative
- negative
- negative
2 papers more in this group
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.