Abstract
Abstract— Recently we reported on the stimulating effect of a cold, dark pretreatment on the processes of greening of dark‐grown angiosperms under continuous white light (Schönbohm et al. , 1988; Physiol. Plant. 72 ,541–546). These effects could be nullified by a subsequent second dark phase (25°C) which precedes the white light period. Our analysis was now focused on the effect of cold, dark pretreatments (with or without red‐preirradiation) on the gas exchange (O 2 ; CO 2 ) of etiolated primary leaves of wheat during a subsequent white light period. The following results were obtained: (1) The net‐O 2 ‐consumption under continuous white light decreased much more quickly after a cold than after a warm pretreatment. (2) This effect was enhanced by red‐preirradiation. (3) The O 2 ‐compensation point was reached more quickly during the de‐etiolation period when the leaves had been subjected to a cold instead to a warm pretreatment. (4) The “cold‐effect” could be nullified by a subsequent warm, dark pretreatment (in this material the compensation point could not be reached within 8 h). (5) Cold treated material which had also been exposed to red light showed during the first 30 min of de‐etiolation an extremely strong “ out‐burst” of CO 2 . No correlation was apparent between the O 2 ‐uptake and this high CO 2 ‐release. (6) A cold, dark pretreatment induces a decrease of CO 2 ‐release during the second half of the de‐etiolation period. This effect could be nullified by a secondary warm, dark treatment given after the cold, dark pretreatment. Our experiments indicate that red‐preirradiation and cold, dark pretreatment stimulate chlorophyll synthesis (Schonbohm et al. , 1988) and also photosynthetic O 2 ‐evolution and CO 2 ‐uptake. We also assume that this pretreatment causes CO 2 release that is neither directly related to the respiratory electron transport chain nor to the photorespiration.
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Claims 10
Claim · model-written summary
Cold pretreatment made net oxygen consumption decline faster than warm pretreatment.
- Taxon
- WHEAT
Triticum aestivumt0 - Treatment
- colde0
- Outcome
- net‐O 2 ‐consumptione0
- Direction
- decreased much more quicklye0
- Comparator
- warm pretreatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“The net‐O 2 ‐consumption under continuous white light decreased much more quickly after a cold than after a warm pretreatment.”
Claim · model-written summary
Red preirradiation enhanced the cold effect on oxygen consumption.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- red‐preirradiatione0
- Outcome
- net‐O 2 ‐consumptione1
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“This effect was enhanced by red‐preirradiation.”
e1“The net‐O 2 ‐consumption under continuous white light decreased much more quickly after a cold than after a warm pretreatment.”
Claim · model-written summary
Cold pretreatment brought the oxygen compensation point sooner than warm pretreatment.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- colde0
- Outcome
- O 2 ‐compensation pointe0
- Direction
- more quicklye0
- Comparator
- warm pretreatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The O 2 ‐compensation point was reached more quickly during the de‐etiolation period when the leaves had been subjected to a cold instead to a warm pretreatment.”
t0“WHEAT”
Claim · model-written summary
A following warm dark pretreatment nullified the cold effect on oxygen compensation.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- subsequent warm, dark pretreatmente0
- Outcome
- compensation pointe0
- Direction
- nullifiede0
- Value
- 8 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“The “cold‐effect” could be nullified by a subsequent warm, dark pretreatment (in this material the compensation point could not be reached within 8 h).”
Claim · model-written summary
Cold and red-light treated leaves had a strong early carbon dioxide release burst.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- out‐burst” of CO 2e0
- Qualifier
- first 30 min of de‐etiolatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“Cold treated material which had also been exposed to red light showed during the first 30 min of de‐etiolation an extremely strong “ out‐burst” of CO 2 .”
Claim · model-written summary
Oxygen uptake and the high carbon dioxide release showed no apparent correlation.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- O 2 ‐uptakee0
- Comparator
- high CO 2 ‐releasee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“No correlation was apparent between the O 2 ‐uptake and this high CO 2 ‐release.”
Claim · model-written summary
Cold dark pretreatment decreased later carbon dioxide release.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- cold, dark pretreatmente0
- Outcome
- CO 2 ‐releasee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“A cold, dark pretreatment induces a decrease of CO 2 ‐release during the second half of the de‐etiolation period.”
Claim · model-written summary
Secondary warm dark treatment nullified the cold effect on later carbon dioxide release.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- secondary warm, dark treatmente0
- Outcome
- CO 2 ‐releasee1
- Direction
- nullifiede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“This effect could be nullified by a secondary warm, dark treatment given after the cold, dark pretreatment.”
e1“A cold, dark pretreatment induces a decrease of CO 2 ‐release during the second half of the de‐etiolation period.”
Claim · model-written summary
The authors infer red preirradiation and cold pretreatment stimulate photosynthetic oxygen evolution and carbon dioxide uptake.
- Taxon
- WHEATTriticum aestivumt0
- Treatment
- red‐preirradiation and cold, dark pretreatmente0
- Outcome
- photosynthetic O 2 ‐evolution and CO 2 ‐uptakee0
- Direction
- stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“red‐preirradiation and cold, dark pretreatment stimulate chlorophyll synthesis (Schonbohm et al. , 1988) and also photosynthetic O 2 ‐evolution and CO 2 ‐uptake.”
Claim · model-written summary
The authors hypothesize pretreatment causes carbon dioxide release unrelated directly to respiration or photorespiration.
- Taxon
- WHEATTriticum aestivumt0
- Outcome
- CO 2 releasee0
- Qualifier
- neither directly related to the respiratory electron transport chain nor to the photorespiratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“WHEAT”
e0“this pretreatment causes CO 2 release that is neither directly related to the respiratory electron transport chain nor to the photorespiration.”
The same questions in other papers
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- negative
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See all 39 papers →light · environment: emissions · Triticum aestivum (wheat)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.