Abstract
Low temperatures and high sunlight, factors that are characteristic of high elevations, may lead to the low-temperature photoinhibition of photosynthesis (LTP).Exposure and photosynthetic responses to low temperature and high sunlight were compared among current-year seedlings of the conifers Abies lasiocarpa and Picea engelmannii, and the snowbank perennials Caltha leptosepala and Erythronium grandiflorum, in the alpine treeline ecotone.The ratio of silhouette (sunlit) to total leaf area of whole plants was greatest in A. lasiocarpa (0.33), 25% lower in P. engelmannii (0.25), and at least 36% lower in the snowbank perennials than for A. lasiocarpa.This indicated less structural avoidance of high sunlight in the conifer seedlings, particularly A. lasiocarpa.CO 2 assimilation (A,at) in A. lasiocarpa was reduced 40% due to frosts, high sunlight (22%), and their combination (90%).A sa ' was much less affected by frosts and high sunlight in P. engelmannii and especially the perennials.Following frost and high sunlight exposure, diurnal reductions in maximum photosynthetic efficiency, indicated by the chlorophyll fluorescence ratio FJFmcorresponded to species differences in A,a,' A substantially greater degree of slowly-reversible, or irreversible LTP (44% reduction in predawn FJF m ) occurred in the microclimate above snow for A. lasiocarpa compared to the other species.It appears that a higher resistance to LTP in the perennials may contribute to their greater occurrence in microsites with lower temperatures and higher sunlight compared to the conifer seedlings.
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Claims 12
Claim · model-written summary
The ratio of sunlit silhouette to total leaf area of whole plants was greatest in Abies lasiocarpa seedlings (0.33).
- Taxon
- A. lasiocarpa
Abies lasiocarpae0 - Outcome
- ratio of silhouette (sunlit) to total leaf areae0
- Direction
- greateste0
- Value
- 0.33e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratio of silhouette (sunlit) to total leaf area of whole plants was greatest in A. lasiocarpa (0.33)”
Claim · model-written summary
The ratio of sunlit silhouette to total leaf area was 25% lower in Picea engelmannii (0.25) than in A. lasiocarpa.
- Taxon
- P. engelmannii
Picea engelmanniie0 - Outcome
- ratio of silhouette (sunlit) to total leaf areae0
- Direction
- lowere0
- Value
- 0.25e0
- Comparator
- A. lasiocarpae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratio of silhouette (sunlit) to total leaf area of whole plants was greatest in A. lasiocarpa (0.33), 25% lower in P. engelmannii (0.25)”
Claim · model-written summary
The ratio of sunlit silhouette to total leaf area was at least 36% lower in the snowbank perennials than in A. lasiocarpa.
Verbatim
e0“The ratio of silhouette (sunlit) to total leaf area”
e1“at least 36% lower in the snowbank perennials than for A. lasiocarpa”
Claim · model-written summary
The silhouette-area results indicate less structural avoidance of high sunlight in the conifer seedlings, particularly A. lasiocarpa.
Verbatim
e0“This indicated less structural avoidance of high sunlight in the conifer seedlings, particularly A. lasiocarpa”
Claim · model-written summary
CO2 assimilation in A. lasiocarpa was reduced by 40% due to frosts.
- Taxon
- A. lasiocarpaAbies lasiocarpae0
- Treatment
- frostse0
- Outcome
- CO 2 assimilatione0
- Direction
- reducede0
- Value
- 40%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 assimilation (A,at) in A. lasiocarpa was reduced 40% due to frosts, high sunlight (22%), and their combination (90%)”
Claim · model-written summary
CO2 assimilation in A. lasiocarpa was reduced by 22% due to high sunlight.
- Taxon
- A. lasiocarpaAbies lasiocarpae0
- Treatment
- high sunlighte0
- Outcome
- CO 2 assimilatione0
- Direction
- reducede0
- Value
- 22%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 assimilation (A,at) in A. lasiocarpa was reduced 40% due to frosts, high sunlight (22%), and their combination (90%)”
Claim · model-written summary
CO2 assimilation in A. lasiocarpa was reduced by 90% due to the combination of frosts and high sunlight.
- Taxon
- A. lasiocarpaAbies lasiocarpae0
- Treatment
- their combinatione0
- Outcome
- CO 2 assimilatione0
- Direction
- reducede0
- Value
- 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 assimilation (A,at) in A. lasiocarpa was reduced 40% due to frosts, high sunlight (22%), and their combination (90%)”
Claim · model-written summary
Assimilation was much less affected by frosts and high sunlight in P. engelmannii than in A. lasiocarpa.
- Taxon
- P. engelmanniiPicea engelmanniie0
- Treatment
- frosts and high sunlighte0
- Outcome
- A sa 'e0
- Direction
- much less affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A sa ' was much less affected by frosts and high sunlight in P. engelmannii and especially the perennials”
Claim · model-written summary
Assimilation was especially little affected by frosts and high sunlight in the snowbank perennials.
Not reportedComparator
Verbatim
e0“A sa ' was much less affected by frosts and high sunlight in P. engelmannii and especially the perennials”
Claim · model-written summary
After frost and high sunlight exposure, diurnal reductions in maximum photosynthetic efficiency (chlorophyll fluorescence ratio) corresponded to species differences in assimilation.
Verbatim
t0“Differences in Microsite, Plant Form, and Low-Temperature Photoinhibition in Alpine Plants”
e0“Following frost and high sunlight exposure, diurnal reductions in maximum photosynthetic efficiency, indicated by the chlorophyll fluorescence ratio FJFmcorresponded to species differences in A,a,'”
Claim · model-written summary
Slowly-reversible or irreversible low-temperature photoinhibition (44% reduction in predawn Fv/Fm) was substantially greater for A. lasiocarpa in the microclimate above snow than in the other species.
- Taxon
- A. lasiocarpaAbies lasiocarpae0
- Outcome
- slowly-reversible, or irreversible LTPe0
- Direction
- greatere0
- Value
- 44% reductione0
- Comparator
- the other speciese0
- Setting
- microclimate above snowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A substantially greater degree of slowly-reversible, or irreversible LTP (44% reduction in predawn FJF m ) occurred in the microclimate above snow for A. lasiocarpa compared to the other species”
Claim · model-written summary
Higher resistance to low-temperature photoinhibition in the perennials may contribute to their greater occurrence in microsites with lower temperatures and higher sunlight than the conifer seedlings.
Verbatim
e0“higher resistance to LTP in the perennials may contribute to their greater occurrence in microsites with lower temperatures and higher sunlight compared to the conifer seedlings”
The same questions in other papers
light · physiology: photosynthesis · Abies lasiocarpa (subalpine fir)Results agree
2 papers in the same direction as this paper
- negative
- 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.