Abstract
The interactive effects of light and drought on water relations and soluble sugars were addressed on Quercus suber L. seedlings grown under the combination of four irradiances and two soil water contents. Leaf water potentials at predawn and midday were lower for water stressed seedlings, independently of light environment. Osmotic potentials at full ( 100 ) and zero turgor ( 0 ) decreased with drought, under the four light treatments. However, the decline was greater with the development of water stress under the two treatments of higher light availability. The higher soluble sugar concentrations in seedlings grown under higher irradiances provoked a decrease of 0. The decrease in 100 and 0 in moderate stressed seedlings was accompanied by an increase in max . The lower ability for osmotic adjustment in seedlings grown under moderate water stress and low light environment suggested a lower efficiency in developing physiological mechanisms for drought tolerance in shade-grown seedlings. cork oak / drought / light / osmotic adjustment / soluble sugars Rsum -Relations hydriques des semis de chne-lige (Quercus suber L.) en rponse l'ombre et une scheresse modre. Les effets interactifs de la lumire et de la scheresse sur les relations hydriques et les sucres solubles ont t tudis sur des plantules de Quercus suber L. qui ont pouss sous la combinaison de quatre clairements diffrents et de deux contenus en eau du sol. Les potentiels hydriques foliaires mesurs l'un avant l'aube et l'autre midi taient plus bas pour les plantules subissant un stress hydrique indpendamment du niveau d'clairement. La pression osmotique pleine turgescence ( 100 ) et la pression osmotique turgescence nulle ( 0 ) ont diminu avec la scheresse sous les quatre clairements. Cependant, les diminutions taient plus grandes pour les plantules soumises un stress hydrique et un clairement lev. La plus grande concentration de sucres solubles des plantules ayant pouss sous un plus grand clairement a provoqu la diminution de 0 . La diminution de 100 et de 0 pour les plantules ayant pouss sous une scheresse modre a t accompagne d'une augmentation de max . La moindre capacit pour l'ajustement osmotique des plantules ayant pouss sous un stress hydrique modr et une faible intensit lumineuse a montr une plus faible efficacit pour le dveloppement des mcanismes physiologiques de tolrance la scheresse de ces plantules ayant pouss l'ombre. chne-lige / scheresse / lumire / ajustement osmotique / sucres solubles
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Claims 6
Claim · model-written summary
Water-stressed cork oak seedlings had lower predawn and midday leaf water potentials regardless of light conditions.
- Taxon
- Quercus suber L.
Quercus subert0 - Treatment
- water stressede0
- Outcome
- Leaf water potentials at predawn and middaye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf water potentials at predawn and midday were lower for water stressed seedlings, independently of light environment.”
t0“cork oak (Quercus suber L.) seedlings”
Claim · model-written summary
Drought lowered osmotic potential at full and zero turgor under all four light treatments.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- droughte0
- Outcome
- Osmotic potentials at full ( 100 ) and zero turgor ( 0 )e0
- Direction
- decreasede0
- Qualifier
- four light treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Osmotic potentials at full ( 100 ) and zero turgor ( 0 ) decreased with drought, under the four light treatments.”
t0“Quercus suber L.”
Claim · model-written summary
The drought-related osmotic potential decline was greater under the two higher-light treatments.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- higher light availabilitye0
- Outcome
- declinee0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decline was greater with the development of water stress under the two treatments of higher light availability.”
t0“Quercus suber L.”
Claim · model-written summary
Higher irradiance increased soluble sugar concentration and thereby decreased osmotic potential at zero turgor.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- higher irradiancese0
- Outcome
- decrease of 0e0
- Qualifier
- higher soluble sugar concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher soluble sugar concentrations in seedlings grown under higher irradiances provoked a decrease of 0.”
t0“Quercus suber L.”
Claim · model-written summary
Moderately stressed seedlings showed increased max as osmotic potentials decreased.
- Taxon
- Quercus suber L.Quercus subert0
- Treatment
- moderate stressede0
- Outcome
- maxe0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in 100 and 0 in moderate stressed seedlings was accompanied by an increase in max .”
t0“Quercus suber L.”
Claim · model-written summary
Shade-grown seedlings under moderate water stress showed less osmotic adjustment capacity, suggesting weaker drought tolerance mechanisms.
- Taxon
- Quercus suber L.Quercus subert0
- Outcome
- ability for osmotic adjustmente0
- Direction
- lowere0
- Qualifier
- moderate water stress and low light environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lower ability for osmotic adjustment in seedlings grown under moderate water stress and low light environment suggested a lower efficiency in developing physiological mechanisms for drought tolerance in shade-grown seedlings.”
t0“Quercus suber L.”
The same questions in other papers
drought · physiology: water · Quercus suber (cork oak)Results agree
1 paper in the same direction as this paper
- negative
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.