Abstract
The goal of this research was to investigate the effect of electrical conductivity (EC) levels of the nutrient solution on the fresh weight, chlorophyll, and nitrate content of hydroponic-system-grown lettuce. The selected cultivars are the most representative commercial varieties grown for European markets. Seven cultivars (‘Sintia,’ ‘Limeira,’ ‘Corentine,’ ‘Cencibel,’ ‘Kiber,’ ‘Attiraï,’ and ‘Rouxaï’) of three Lactuca sativa L. types’ (butterhead, loose leaf, and oak leaf) were grown in a phytotron in rockwool, meanwhile the EC level of the nutrient solutions were different: normal (<1.3 dS/m) and high (10 dS/m). The plants in the saline condition had a lower yield but elevated chlorophyll content and nitrate level, although the ‘Limeira’ and ‘Cencibel’ cultivars had reduced nitrate levels. The results and the special characteristic of the lollo-type cultivars showed that the nitrate level could be very different due to salinity (‘Limeira’ had the lowest (684 µg/g fresh weight (FW)) and ‘Cencibel’ had the highest (4396 µg/g FW)). There was a moderately strong negative correlation (−0.542) in the reverse ratio among the chlorophyll and nitrate contents in plants treated with a normal EC value, while this relationship was not shown in the saline condition. Under the saline condition, cultivars acted differently, and all examined cultivars stayed under the permitted total nitrate level (5000 µg/g FW).
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Claims 10
Claim · model-written summary
Saline conditions lowered lettuce yield.
- Taxon
- Lactuca sativa L.
Lactuca sativat0 - Treatment
- saline conditione0
- Outcome
- yielde0
- Direction
- lowere0
- Comparator
- normal (<1.3 dS/m)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants in the saline condition had a lower yield”
t0“Lactuca sativa L.”
e1“normal (<1.3 dS/m) and high (10 dS/m)”
Claim · model-written summary
Saline conditions raised lettuce chlorophyll content.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- saline conditione1
- Outcome
- chlorophyll contente0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated chlorophyll content and nitrate level”
t0“Lactuca sativa L.”
e1“plants in the saline condition”
Claim · model-written summary
Saline conditions raised lettuce nitrate level.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- saline conditione1
- Outcome
- nitrate levele0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated chlorophyll content and nitrate level”
t0“Lactuca sativa L.”
e1“plants in the saline condition”
Claim · model-written summary
Limeira had reduced nitrate levels under salinity.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Material
- ‘Limeira’e0
- Treatment
- salinitye1
- Outcome
- nitrate levelse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ‘Limeira’ and ‘Cencibel’ cultivars had reduced nitrate levels”
t0“Lactuca sativa L.”
e1“nitrate level could be very different due to salinity”
Claim · model-written summary
Cencibel had reduced nitrate levels under salinity.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Material
- ‘Cencibel’e0
- Treatment
- salinitye1
- Outcome
- nitrate levelse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ‘Limeira’ and ‘Cencibel’ cultivars had reduced nitrate levels”
t0“Lactuca sativa L.”
e1“nitrate level could be very different due to salinity”
Claim · model-written summary
Limeira had the lowest reported nitrate concentration, 684 µg/g fresh weight.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Material
- ‘Limeira’e0
- Outcome
- nitrate levele1
- Direction
- loweste0
- Value
- 684 µg/g fresh weight (FW)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Limeira’ had the lowest (684 µg/g fresh weight (FW))”
t0“Lactuca sativa L.”
e1“nitrate level could be very different due to salinity”
Claim · model-written summary
Cencibel had the highest reported nitrate concentration, 4396 µg/g FW.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Material
- ‘Cencibel’e0
- Outcome
- nitrate levele1
- Direction
- higheste0
- Value
- 4396 µg/g FWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Cencibel’ had the highest (4396 µg/g FW)”
t0“Lactuca sativa L.”
e1“nitrate level could be very different due to salinity”
Claim · model-written summary
Chlorophyll and nitrate contents were negatively correlated at normal EC.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- normal EC valuee0
- Outcome
- chlorophyll and nitrate contentse0
- Direction
- negative correlatione0
- Value
- −0.542e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a moderately strong negative correlation (−0.542) in the reverse ratio among the chlorophyll and nitrate contents in plants treated with a normal EC value”
t0“Lactuca sativa L.”
Claim · model-written summary
The chlorophyll–nitrate relationship was not found under salinity.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Treatment
- saline conditione0
- Outcome
- this relationshipe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this relationship was not shown in the saline condition”
t0“Lactuca sativa L.”
Claim · model-written summary
All examined cultivars stayed below the permitted nitrate level under salinity.
- Taxon
- Lactuca sativa L.Lactuca sativat0
- Outcome
- total nitrate levele0
- Direction
- undere0
- Value
- 5000 µg/g FWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all examined cultivars stayed under the permitted total nitrate level (5000 µg/g FW)”
t0“Lactuca sativa L.”
The same questions in other papers
salinity · yield · Lactuca sativa (garden lettuce)Results differ
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- negative
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See all 16 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.