Abstract
Lettuce (cv. Waldmann's Green) and radish (cv. Giant White Globe) plants were grown hydroponically with a 18-hr photoperiod and 300 μmol m -2 s -1 PPF. Treatments consisted of 400, 1000, 5000 and 10000 μmol mol carbon dioxide (CO 2 ). Leaf stomatal conductance was monitored with a steady-state porometer across one diurnal period at 21 days and all plants were harvested at 25 days. Conductance at 400 and 10000 was > 1000 μmol mol -1 for lettuce and conductance at 5000 and 10000 was > 1000 and 400 μmol mol -1 CO 2 for radish. Carbondioxide treatments having the lowest leaf conductances also resulted in the highest yields, viz. 1,000 μmol mol -1 CO 2 for radish and 5000 μmol mol -1 CO 2 , for lettuce. Dark-period conductance was higher at 5000 and 10000 μmol mol -1 CO 2 compared to 400 and 1000 μmol mol -1 CO 2 . The higher dark-period conductances were 70% of the light-period rates for lettuce and 30% for radish. Water use efficiency (WUE) (g biomass kg water -1 ) was lowest at 400 μmol mol -1 CO 2 for both lettuce and radish and was highest at 1000 μmol mol -1 CO 2 for lettuce and 5000 μmol mol -1 CO 2 for radish. The results suggest that WUE was improved with moderate CO 2 enrichment but declined at very high concentrations, i.e. 10000 μmol mol -1 for lettuce and radish.
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Claims 12
Claim · model-written summary
Lettuce conductance at 400 and 10000 exceeded 1000.
- Taxon
- lettuce
Lactuca sativae0 - Outcome
- Conductancee0
- Value
- > 1000 μmol mol -1e0
- Qualifier
- at 400 and 10000e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conductance at 400 and 10000 was > 1000 μmol mol -1 for lettuce”
Claim · model-written summary
The reported radish conductance values at 5000 and 10000 were above 1000 and 400, respectively.
- Taxon
- radish
Raphanus sativuse0 - Outcome
- conductancee0
- Value
- > 1000 and 400 μmol mol -1 CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conductance at 5000 and 10000 was > 1000 and 400 μmol mol -1 CO 2 for radish”
Claim · model-written summary
Radish yield was highest at 1000 CO2.
- Taxon
- radishRaphanus sativuse0
- Treatment
- 1,000 μmol mol -1 CO 2e0
- Outcome
- yieldse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest yields, viz. 1,000 μmol mol -1 CO 2 for radish”
Claim · model-written summary
Lettuce yield was highest at 5000 CO2.
- Taxon
- lettuceLactuca sativae0
- Treatment
- 5000 μmol mol -1 CO 2e0
- Outcome
- yieldse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest yields, viz. 1,000 μmol mol -1 CO 2 for radish and 5000 μmol mol -1 CO 2 , for lettuce”
Claim · model-written summary
Dark-period conductance was higher at 5000 and 10000 than 400 and 1000.
- Taxon
- Lettuce and radishRaphanus sativusLactuca sativat0
- Treatment
- 5000 and 10000 μmol mol -1 CO 2e0
- Outcome
- Dark-period conductancee0
- Direction
- highere0
- Comparator
- 400 and 1000 μmol mol -1 CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark-period conductance was higher at 5000 and 10000 μmol mol -1 CO 2 compared to 400 and 1000 μmol mol -1 CO 2 .”
t0“LETTUCE AND RADISH”
Claim · model-written summary
Higher dark-period conductance reached 70% of light-period rates in lettuce.
- Taxon
- lettuceLactuca sativae0
- Outcome
- dark-period conductancese0
- Value
- 70%e0
- Comparator
- light-period ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher dark-period conductances were 70% of the light-period rates for lettuce”
Claim · model-written summary
Higher dark-period conductance reached 30% of light-period rates in radish.
- Taxon
- radishRaphanus sativuse0
- Outcome
- dark-period conductancese0
- Value
- 30%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher dark-period conductances were 70% of the light-period rates for lettuce and 30% for radish.”
t0“LETTUCE AND RADISH”
Claim · model-written summary
Lettuce WUE was lowest at 400 CO2.
- Taxon
- lettuceLactuca sativae0
- Treatment
- 400 μmol mol -1 CO 2e0
- Outcome
- Water use efficiencye0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency (WUE) (g biomass kg water -1 ) was lowest at 400 μmol mol -1 CO 2 for both lettuce and radish”
Claim · model-written summary
Radish WUE was lowest at 400 CO2.
- Taxon
- radishRaphanus sativuse0
- Treatment
- 400 μmol mol -1 CO 2e0
- Outcome
- Water use efficiencye0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency (WUE) (g biomass kg water -1 ) was lowest at 400 μmol mol -1 CO 2 for both lettuce and radish”
Claim · model-written summary
Lettuce WUE was highest at 1000 CO2.
- Taxon
- lettuceLactuca sativae0
- Treatment
- 1000 μmol mol -1 CO 2e0
- Outcome
- WUEe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency (WUE) (g biomass kg water -1 ) was lowest at 400 μmol mol -1 CO 2 for both lettuce and radish and was highest at 1000 μmol mol -1 CO 2 for lettuce”
t0“LETTUCE AND RADISH”
Claim · model-written summary
Radish WUE was highest at 5000 CO2.
- Taxon
- radishRaphanus sativuse0
- Treatment
- 5000 μmol mol -1 CO 2e0
- Outcome
- WUEe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water use efficiency (WUE) (g biomass kg water -1 ) was lowest at 400 μmol mol -1 CO 2 for both lettuce and radish and was highest at 1000 μmol mol -1 CO 2 for lettuce and 5000 μmol mol -1 CO 2 for radish.”
t0“LETTUCE AND RADISH”
Claim · model-written summary
The authors infer moderate CO2 enrichment improves WUE but very high enrichment reduces it.
- Taxon
- lettuce and radishRaphanus sativusLactuca sativae0
- Treatment
- CO 2 enrichmente0
- Outcome
- WUEe0
- Direction
- improvede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE was improved with moderate CO 2 enrichment but declined at very high concentrations, i.e. 10000 μmol mol -1 for lettuce and radish”
The same questions in other papers
co2 · yield · Lactuca sativa (garden lettuce)Results differ
6 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- no effect
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See all 11 papers →co2 · yield · Raphanus sativus (radish)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
2 papers more in this group
See all 6 papers →co2 · physiology: water · Lactuca sativa (garden lettuce)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.