Abstract
Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation. The water content, relative water content, xylem pressure potential, transpiration rate, root hydraulic conductance, and abscisic acid (ABA) content of root exudate were then measured. Water content decreased in woody stems and needles with cold acclimation but not in the roots and green stems. There was a close correlation between relative water content and water content of woody stems and needles as well as a decrease in xylem pressure potentials of hardy needles, indicating that the reduction in water content was at least partially due to increased water deficit. The increased water deficit was not caused by increased water loss since transpiration rates decreased in hardy shoots. Water uptake was reduced by decreased root hydraulic conductance which could account for the shoot water deficits. Root hydraulic conductance and transpiration rate returned to non-acclimated levels after warm temperature exposure. ABA levels were highest in the root exudate collected in the morning from non-acclimated plants.
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Claims 9
Claim · model-written summary
Cold acclimation decreased water content in woody stems and needles of Pinus sylvestris.
- Taxon
- Pinus sylvestris L.
Pinus sylvestrise0 - Organ / stage
- woody stems and needlese1
- Treatment
- cold acclimatione1
- Outcome
- Water contente1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e1“Water content decreased in woody stems and needles with cold acclimation but not in the roots and green stems”
Claim · model-written summary
Cold acclimation did not change water content in roots and green stems of Pinus sylvestris.
- Taxon
- Pinus sylvestris L.Pinus sylvestrise0
- Organ / stage
- roots and green stemse1
- Treatment
- cold acclimatione1
- Outcome
- Water contente1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e1“Water content decreased in woody stems and needles with cold acclimation but not in the roots and green stems”
Claim · model-written summary
Relative water content and water content of woody stems and needles were closely correlated.
- Taxon
- Pinus sylvestris L.Pinus sylvestrise0
- Organ / stage
- woody stems and needlese2
- Outcome
- relative water contente2
- Qualifier
- close correlatione2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e2“There was a close correlation between relative water content and water content of woody stems and needles as well as a decrease in xylem pressure potentials of hardy needles, indicating that the reduction in water content was at least partially due to increased water deficit”
Claim · model-written summary
Xylem pressure potentials decreased in hardy needles of Pinus sylvestris.
- Taxon
- Pinus sylvestris L.Pinus sylvestrise0
- Organ / stage
- hardy needlese2
- Outcome
- xylem pressure potentialse2
- Direction
- decreasee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e2“There was a close correlation between relative water content and water content of woody stems and needles as well as a decrease in xylem pressure potentials of hardy needles, indicating that the reduction in water content was at least partially due to increased water deficit”
Claim · model-written summary
Transpiration rates decreased in hardy shoots of Pinus sylvestris.
- Taxon
- Pinus sylvestris L.Pinus sylvestrise0
- Organ / stage
- hardy shootse3
- Outcome
- transpiration ratese3
- Direction
- decreasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e3“The increased water deficit was not caused by increased water loss since transpiration rates decreased in hardy shoots”
Claim · model-written summary
The increased water deficit in Pinus sylvestris was not caused by increased water loss.
- Taxon
- Pinus sylvestris L.Pinus sylvestrise0
- Organ / stage
- hardy shootse3
- Outcome
- water deficite3
- Direction
- increasede3
- Qualifier
- not caused by increased water losse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e3“The increased water deficit was not caused by increased water loss since transpiration rates decreased in hardy shoots”
Claim · model-written summary
Reduced water uptake may account for the shoot water deficits, through decreased root hydraulic conductance.
- Taxon
- Pinus sylvestris L.Pinus sylvestrise0
- Outcome
- Water uptakee4
- Direction
- reducede4
- Qualifier
- decreased root hydraulic conductancee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e4“Water uptake was reduced by decreased root hydraulic conductance which could account for the shoot water deficits”
Claim · model-written summary
Root hydraulic conductance and transpiration rate returned to non-acclimated levels after warm temperature exposure.
- Taxon
- Pinus sylvestris L.Pinus sylvestrise0
- Treatment
- warm temperature exposuree5
- Outcome
- Root hydraulic conductance and transpiration ratee5
- Direction
- returnede5
- Comparator
- non-acclimated levelse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e5“Root hydraulic conductance and transpiration rate returned to non-acclimated levels after warm temperature exposure”
Claim · model-written summary
ABA levels in root exudate were highest in the morning from non-acclimated Pinus sylvestris plants.
- Taxon
- Pinus sylvestris L.Pinus sylvestrise0
- Organ / stage
- root exudatee6
- Outcome
- ABA levelse6
- Direction
- higheste6
- Qualifier
- collected in the morninge6
- Comparator
- non-acclimated plantse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scotch pine seedlings (Pinus sylvestris L.) were subjected to 6 week photoperiod and thermoperiod treatments to induce different levels of cold acclimation”
e6“ABA levels were highest in the root exudate collected in the morning from non-acclimated plants”