Abstract
Responses of Quercus ilex L. seedlings from three different localities in Italy to experimentally imposed drought stress were analysed. Predawn (Ψpd) and midday (Ψm) leaf water potential of stressed seedlings decreased on an average until -4.0 and -4.2 MPa, respectively, in the severe water stress. At the end of the severe water stress the relative water content (RWC) was 72.5 - 83.6 % and the photosynthetic rates (PN) near zero. The critical threshold value of Ψpd for complete stomatal closure was from -4.0 to -4.5 MPa. The leaf damage after the severe water stress was significantly greater in seedlings originated from the acorns of climax area (45 % total leaf injured area and 40 % fallen leaves) than in the other seedlings (on an average 20.5 % total leaf injured area and 21 % fallen leaves).
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Claims 7
Claim · model-written summary
Severe drought reduced predawn leaf water potential to an average of -4.0 MPa.
- Taxon
- Quercus ilex L.
Quercus ilexe1 - Treatment
- severe water stresse0
- Outcome
- Predawn (Ψpd)e0
- Direction
- decreasede0
- Value
- -4.0e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Predawn (Ψpd) and midday (Ψm) leaf water potential of stressed seedlings decreased on an average until -4.0 and -4.2 MPa, respectively, in the severe water stress.”
e1“Quercus ilex L. seedlings”
Claim · model-written summary
Severe drought reduced midday leaf water potential to an average of -4.2 MPa.
- Taxon
- Quercus ilex L.Quercus ilexe1
- Treatment
- severe water stresse0
- Outcome
- midday (Ψm) leaf water potentiale0
- Direction
- decreasede0
- Value
- -4.2 MPae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Predawn (Ψpd) and midday (Ψm) leaf water potential of stressed seedlings decreased on an average until -4.0 and -4.2 MPa, respectively, in the severe water stress.”
e1“Quercus ilex L. seedlings”
Claim · model-written summary
Relative water content after severe water stress was 72.5 - 83.6%.
- Taxon
- Quercus ilexQuercus ilext0
- Treatment
- severe water stresse0
- Outcome
- relative water content (RWC)e0
- Value
- 72.5 - 83.6 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the end of the severe water stress the relative water content (RWC) was 72.5 - 83.6 % and the photosynthetic rates (PN) near zero.”
t0“Quercus ilex”
Claim · model-written summary
Photosynthetic rates were near zero after severe water stress.
- Taxon
- Quercus ilexQuercus ilext0
- Treatment
- severe water stresse0
- Outcome
- photosynthetic rates (PN)e0
- Value
- near zeroe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the end of the severe water stress the relative water content (RWC) was 72.5 - 83.6 % and the photosynthetic rates (PN) near zero.”
t0“Quercus ilex”
Claim · model-written summary
Complete stomatal closure occurred at a predawn water potential threshold of -4.0 to -4.5 MPa.
- Taxon
- Quercus ilexQuercus ilext0
- Outcome
- complete stomatal closuree0
- Value
- -4.0 to -4.5 MPae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical threshold value of Ψpd for complete stomatal closure was from -4.0 to -4.5 MPa.”
t0“Quercus ilex”
Claim · model-written summary
Climax-area seedlings had significantly greater injured leaf area after severe drought, 45% versus 20.5%.
- Taxon
- Quercus ilexQuercus ilext0
- Material
- seedlings originated from the acorns of climax areae0
- Outcome
- total leaf injured areae0
- Direction
- greatere0
- Value
- 45 %e0
- Qualifier
- 20.5 %e0
- Comparator
- other seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf damage after the severe water stress was significantly greater in seedlings originated from the acorns of climax area (45 % total leaf injured area and 40 % fallen leaves) than in the other seedlings (on an average 20.5 % total leaf injured area and 21 % fallen leaves).”
t0“Quercus ilex”
Claim · model-written summary
Climax-area seedlings had significantly more fallen leaves after severe drought, 40% versus 21%.
- Taxon
- Quercus ilexQuercus ilext0
- Material
- seedlings originated from the acorns of climax areae0
- Outcome
- fallen leavese0
- Direction
- greatere0
- Value
- 40 %e0
- Qualifier
- 21 %e0
- Comparator
- other seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf damage after the severe water stress was significantly greater in seedlings originated from the acorns of climax area (45 % total leaf injured area and 40 % fallen leaves) than in the other seedlings (on an average 20.5 % total leaf injured area and 21 % fallen leaves).”
t0“Quercus ilex”
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
- no effect
- negative
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.