Abstract
Abstract ‘Climax’ lettuce ( Lactuca sativa L.) exhibited more severe CO 2 injury symptoms than ‘Salinas’ and ‘Winterhaven’ lettuce when exposed at 20°C to air for 1 day following treatment for 6 days at 0° with 15% CO 2 in air. All 3 cultivars, however, had similar decreases as revealed by NMR analysis, of about 0.4 and 0.1 pH units in the cytoplasm and vacuole, respectively. This result indicates that variation in the buffering capacity was not related to differences in susceptibility to CO 2 injury among these cultivars. Although CO 2 reduced pH, it also reduced titratable acidity of lettuce tissue. This change resulted in a higher pH when the lettuce was moved to air. Exposure of lettuce at 0° to light reduced CO 2 injury by about 50% relative to tissue kept in the dark. Lettuce tissue kept in air had a higher glucose-6-phosphate content than the CO 2 -treated lettuce. A hypothesis regarding alternate energy supply mechanisms for resistance of lettuce tissue to elevated CO 2 injury is discussed.
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Claims 8
Claim · model-written summary
Climax lettuce had more severe CO2 injury than Salinas and Winterhaven after the stated treatment.
- Taxon
- Lettuce
Lactuca sativat0 - Material
- ‘Climax’e0
- Treatment
- 15% CO 2 in aire0
- Outcome
- CO 2 injury symptomse0
- Direction
- more severee0
- Qualifier
- 20°C to air for 1 day following treatment for 6 days at 0°e0
- Comparator
- ‘Salinas’ and ‘Winterhaven’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Climax’ lettuce ( Lactuca sativa L.) exhibited more severe CO 2 injury symptoms than ‘Salinas’ and ‘Winterhaven’ lettuce when exposed at 20°C to air for 1 day following treatment for 6 days at 0° with 15% CO 2 in air.”
t0“Lettuce”
Claim · model-written summary
All three cultivars had about a 0.4 pH unit decrease in cytoplasmic pH.
- Taxon
- LettuceLactuca sativat0
- Material
- All 3 cultivarse0
- Outcome
- pH units in the cytoplasme0
- Direction
- decreasese0
- Value
- about 0.4e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All 3 cultivars, however, had similar decreases as revealed by NMR analysis, of about 0.4 and 0.1 pH units in the cytoplasm and vacuole, respectively.”
t0“Lettuce”
Claim · model-written summary
All three cultivars had about a 0.1 pH unit decrease in vacuolar pH.
- Taxon
- LettuceLactuca sativat0
- Material
- All 3 cultivarse0
- Outcome
- pH units in the cytoplasm and vacuolee0
- Direction
- decreasese0
- Value
- 0.1 pH unitse0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All 3 cultivars, however, had similar decreases as revealed by NMR analysis, of about 0.4 and 0.1 pH units in the cytoplasm and vacuole, respectively.”
t0“Lettuce”
Claim · model-written summary
CO2 reduced titratable acidity in lettuce tissue.
- Taxon
- LettuceLactuca sativat0
- Treatment
- CO 2e0
- Outcome
- titratable acidity of lettuce tissuee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although CO 2 reduced pH, it also reduced titratable acidity of lettuce tissue.”
t0“Lettuce”
Claim · model-written summary
Moving CO2-treated lettuce to air led to higher tissue pH.
- Taxon
- LettuceLactuca sativat0
- Treatment
- moved to aire0
- Outcome
- pHe0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This change resulted in a higher pH when the lettuce was moved to air.”
t0“Lettuce”
Claim · model-written summary
Light at 0° reduced CO2 injury by about 50% compared with darkness.
- Taxon
- LettuceLactuca sativat0
- Treatment
- lighte0
- Outcome
- CO 2 injurye0
- Direction
- reducede0
- Value
- about 50%e0
- Qualifier
- at 0°e0
- Comparator
- tissue kept in the darke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of lettuce at 0° to light reduced CO 2 injury by about 50% relative to tissue kept in the dark.”
t0“Lettuce”
Claim · model-written summary
Air-kept lettuce tissue contained more glucose-6-phosphate than CO2-treated tissue.
- Taxon
- LettuceLactuca sativat0
- Treatment
- aire0
- Outcome
- glucose-6-phosphate contente0
- Direction
- highere0
- Comparator
- CO 2 -treated lettucee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce tissue kept in air had a higher glucose-6-phosphate content than the CO 2 -treated lettuce.”
t0“Lettuce”
Claim · model-written summary
Buffering capacity variation was not related to cultivar differences in CO2 injury susceptibility.
- Taxon
- LettuceLactuca sativat0
- Material
- these cultivarse0
- Outcome
- susceptibility to CO 2 injurye0
- Direction
- not relatede0
- Qualifier
- buffering capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variation in the buffering capacity was not related to differences in susceptibility to CO 2 injury among these cultivars”
t0“Lettuce”
The same questions in other papers
co2 · crop injury · Lactuca sativa (garden lettuce)Results agree
3 papers in the same direction as this paper
- negative
- 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.