Abstract
Plantlets of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) had lower rates of net CO(2) uptake and higher rates of root respiration than greenhouse-grown seedlings. They also had a lower photosynthetic efficiency at high photosynthetic photon flux density, and exhibited significant depression of CO(2) uptake under water stress. The ability of plantlets to utilize high irradiance and to photosynthesize under conditions of water stress was enhanced by the presence of many roots. Carbon dioxide uptake rate increased with increasing root number, and decreased as the needle surface area/root surface area ratio decreased. High root number, low needle surface area/root surface area ratio, and elongated roots were associated with low apparent rates of shoot and root respiration.
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Claims 10
Claim · model-written summary
Plantlets had lower net CO2 uptake rates than greenhouse-grown seedlings.
- Taxon
- Douglas-fir
Pseudotsuga menziesiie0 - Outcome
- net CO(2) uptakee0
- Direction
- lowere0
- Comparator
- greenhouse-grown seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) had lower rates of net CO(2) uptake and higher rates of root respiration than greenhouse-grown seedlings”
Claim · model-written summary
Plantlets had higher root respiration rates than greenhouse-grown seedlings.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- root respiratione0
- Direction
- highere0
- Comparator
- greenhouse-grown seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) had lower rates of net CO(2) uptake and higher rates of root respiration than greenhouse-grown seedlings”
Claim · model-written summary
Plantlets had lower photosynthetic efficiency at high photosynthetic photon flux density.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- high photosynthetic photon flux densitye1
- Outcome
- photosynthetic efficiencye1
- Direction
- lowere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir”
e1“They also had a lower photosynthetic efficiency at high photosynthetic photon flux density”
Claim · model-written summary
Plantlets showed a significant depression of CO2 uptake under water stress.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- water stresse1
- Outcome
- CO(2) uptakee1
- Direction
- depressione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir”
e1“exhibited significant depression of CO(2) uptake under water stress”
Claim · model-written summary
The ability of plantlets to utilize high irradiance and to photosynthesize under water stress was enhanced by many roots.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- presence of many rootse1
- Outcome
- ability of plantlets to utilize high irradiance and to photosynthesize under conditions of water stresse1
- Direction
- enhancede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir”
e1“The ability of plantlets to utilize high irradiance and to photosynthesize under conditions of water stress was enhanced by the presence of many roots”
Claim · model-written summary
CO2 uptake rate increased with increasing root number in plantlets.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- increasing root numbere1
- Outcome
- Carbon dioxide uptake ratee1
- Direction
- increasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir”
e1“Carbon dioxide uptake rate increased with increasing root number, and decreased as the needle surface area/root surface area ratio decreased”
Claim · model-written summary
CO2 uptake rate decreased as the needle surface area to root surface area ratio decreased.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- needle surface area/root surface area ratioe1
- Outcome
- Carbon dioxide uptake ratee1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir”
e1“Carbon dioxide uptake rate increased with increasing root number, and decreased as the needle surface area/root surface area ratio decreased”
Claim · model-written summary
High root number was associated with low apparent rates of shoot and root respiration.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- High root numbere1
- Outcome
- apparent rates of shoot and root respiratione1
- Direction
- lowerinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir”
e1“High root number, low needle surface area/root surface area ratio, and elongated roots were associated with low apparent rates of shoot and root respiration”
Claim · model-written summary
Low needle surface area to root surface area ratio was associated with low apparent rates of shoot and root respiration.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- low needle surface area/root surface area ratioe1
- Outcome
- apparent rates of shoot and root respiratione1
- Direction
- lowerinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir”
e1“High root number, low needle surface area/root surface area ratio, and elongated roots were associated with low apparent rates of shoot and root respiration”
Claim · model-written summary
Elongated roots were associated with low apparent rates of shoot and root respiration.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- elongated rootse1
- Outcome
- apparent rates of shoot and root respiratione1
- Direction
- lowerinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plantlets of Douglas-fir”
e1“High root number, low needle surface area/root surface area ratio, and elongated roots were associated with low apparent rates of shoot and root respiration”