Abstract
Apparent photosynthesis of attached leaves of Phaseolzzs vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum at various intensities of blue and red light was measured by infrared C02 gas analyzer in a closed system. Si~nultaneously the COz compensation point was measured. It was found that light-limited photosynthetic rate in blue light was equal to or more than that in red light. Inhibition of photosynthesis, which sometimes occurred at light-saturated intensities of blue light, could be avoided by addition of red light, prolonged exposure of the plants to blue light, or by lowering the Oz concentration. Accordi~lgly, the increase of photosynthetic rate due to change of Oz concentration from 21 to 3% O2 is higher in blue light only when photosynthesis is inhibited by blue light at 217, 02 . The data on the action of blue and red light on the CO2 co~npensation point seems to exclude the activation of photorespiration by blue light. The possible effects of blue light on apparent photosynthesis are discussed on the basis of the results presented.
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Claims 6
Claim · model-written summary
Light-limited photosynthesis in blue light equalled or exceeded that under red light.
Verbatim
e0“light-limited photosynthetic rate in blue light was equal to or more than that in red light”
t0“attached leaves of Phaseolzzs vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum”
Claim · model-written summary
Adding red light could avoid inhibition caused by saturating blue light.
- Taxon
- Vicia faba
Vicia fabat0 - Treatment
- addition of red lighte0
- Outcome
- Inhibition of photosynthesise0
- Direction
- avoidede0
- Comparator
- blue lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibition of photosynthesis, which sometimes occurred at light-saturated intensities of blue light, could be avoided by addition of red light”
t0“attached leaves of Phaseolzzs vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum”
Claim · model-written summary
Prolonged blue-light exposure could avoid inhibition at saturating blue light.
- Taxon
- Pisum sativum
Lathyrus oleraceust0 - Treatment
- prolonged exposure of the plants to blue lighte0
- Outcome
- Inhibition of photosynthesise0
- Direction
- avoidede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibition of photosynthesis, which sometimes occurred at light-saturated intensities of blue light, could be avoided by addition of red light, prolonged exposure of the plants to blue light”
t0“attached leaves of Phaseolzzs vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum”
Claim · model-written summary
Lowering oxygen concentration could avoid blue-light inhibition of photosynthesis.
- Taxon
- Nicotiana tabacum
Nicotiana tabacumt0 - Treatment
- lowering the Oz concentratione0
- Outcome
- Inhibition of photosynthesise0
- Direction
- avoidede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibition of photosynthesis, which sometimes occurred at light-saturated intensities of blue light, could be avoided by addition of red light, prolonged exposure of the plants to blue light, or by lowering the Oz concentration”
t0“attached leaves of Phaseolzzs vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum”
Claim · model-written summary
A shift from 21 to 3% O2 increased photosynthetic rate more in blue light only when blue light inhibited photosynthesis at 21% oxygen.
- Taxon
- Phaseolzzs vulgarist0
- Treatment
- change of Oz concentration from 21 to 3% O2e0
- Outcome
- photosynthetic ratee0
- Direction
- highere0
- Qualifier
- only when photosynthesis is inhibited by blue lighte0
Not reportedComparator
Verbatim
e0“the increase of photosynthetic rate due to change of Oz concentration from 21 to 3% O2 is higher in blue light only when photosynthesis is inhibited by blue light at 217, 02”
t0“attached leaves of Phaseolzzs vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum”
Claim · model-written summary
The light responses of the CO2 compensation point seemed to exclude activation of photorespiration by blue light.
Verbatim
e0“The data on the action of blue and red light on the CO2 co~npensation point seems to exclude the activation of photorespiration by blue light”
t0“attached leaves of Phaseolzzs vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum”
The same questions in other papers
light · physiology: photosynthesis · Vicia faba (faba bean)Positive and negative results
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- no effect
- negative
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See all 5 papers →light · physiology: photosynthesis · Lathyrus oleraceus (pea)Positive and negative results
9 papers in the same direction as this paper · 14 in the opposite direction
- negative
- negative
- no effect
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See all 24 papers →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.