Abstract
Net photosynthesis in six different conifers was studies under various natural environmental conditions. Changes in the pattern of photosynthesis on clear days, especially the midday decrease, are apparently primarily controlled by changes in leaf water potential. In noble fir and Scots pine, water potential probably acts mainly through its influence on stomatal movement. In grand fir, Douglas—fir, hemlock ,and Sitka spruce, however, some other mechanism, probably mesophyll resistance to CO 2 diffusion, seems to play a more important role. Both mechanisms probably operate concurrently in all species. Daily variations in leaf water potential seem to occur primarily in response to changes in atmospheric moisture, or, more precisely, vapor pressure gradient from leaf to atmosphere. Variation in carbohydrate content, through its influence on solute concentration, may also influence leaf water potential.
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Claims 10
Claim · model-written summary
Leaf water potential apparently primarily controls changes in clear-day photosynthesis, especially the midday decrease.
Verbatim
e0“Changes in the pattern of photosynthesis on clear days, especially the midday decrease, are apparently primarily controlled by changes in leaf water potential.”
e1“six different conifers”
Claim · model-written summary
In noble fir, water potential probably controls photosynthesis mainly through stomatal movement.
Verbatim
e0“In noble fir and Scots pine, water potential probably acts mainly through its influence on stomatal movement.”
e1“Changes in the pattern of photosynthesis”
Claim · model-written summary
In Scots pine, water potential probably controls photosynthesis mainly through stomatal movement.
- Taxon
- Scots pine
Pinus sylvestrise0 - Outcome
- photosynthesise1
- Qualifier
- influence on stomatal movemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In noble fir and Scots pine, water potential probably acts mainly through its influence on stomatal movement.”
e1“Changes in the pattern of photosynthesis”
Claim · model-written summary
In grand fir, mesophyll resistance to CO2 diffusion probably plays a more important role in photosynthesis control.
- Taxon
- grand fir
Abies grandise0 - Outcome
- photosynthesise1
- Qualifier
- mesophyll resistance to CO 2 diffusione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In grand fir, Douglas—fir, hemlock ,and Sitka spruce, however, some other mechanism, probably mesophyll resistance to CO 2 diffusion, seems to play a more important role.”
e1“Changes in the pattern of photosynthesis”
Claim · model-written summary
In Douglas-fir, mesophyll resistance to CO2 diffusion probably plays a more important role in photosynthesis control.
Verbatim
e0“In grand fir, Douglas—fir, hemlock ,and Sitka spruce, however, some other mechanism, probably mesophyll resistance to CO 2 diffusion, seems to play a more important role.”
e1“Changes in the pattern of photosynthesis”
Claim · model-written summary
In hemlock, mesophyll resistance to CO2 diffusion probably plays a more important role in photosynthesis control.
Verbatim
e0“In grand fir, Douglas—fir, hemlock ,and Sitka spruce, however, some other mechanism, probably mesophyll resistance to CO 2 diffusion, seems to play a more important role.”
e1“Changes in the pattern of photosynthesis”
Claim · model-written summary
In Sitka spruce, mesophyll resistance to CO2 diffusion probably plays a more important role in photosynthesis control.
- Taxon
- Sitka spruce
.jpg?width=60)
Picea sitchensise0 - Outcome
- photosynthesise1
- Qualifier
- mesophyll resistance to CO 2 diffusione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“In grand fir, Douglas—fir, hemlock ,and Sitka spruce, however, some other mechanism, probably mesophyll resistance to CO 2 diffusion, seems to play a more important role.”
e1“Changes in the pattern of photosynthesis”
Claim · model-written summary
Stomatal and mesophyll mechanisms probably operate concurrently in all studied conifers.
Verbatim
e0“Both mechanisms probably operate concurrently in all species.”
e1“six different conifers”
e2“Changes in the pattern of photosynthesis”
Claim · model-written summary
Daily conifer leaf water potential variations seem primarily driven by the leaf-to-atmosphere vapor pressure gradient.
Verbatim
e0“Daily variations in leaf water potential seem to occur primarily in response to changes in atmospheric moisture, or, more precisely, vapor pressure gradient from leaf to atmosphere.”
e1“six different conifers”
Claim · model-written summary
Carbohydrate variation may also affect leaf water potential through solute concentration.
Verbatim
e0“Variation in carbohydrate content, through its influence on solute concentration, may also influence leaf water potential.”
e1“six different conifers”