Abstract
BACKGROUND: Little information is available about the impact of nutrient solution ion concentration on quality characteristics and shelf life of fresh-cut lettuce grown in soilless systems in open field. Three lettuce genotypes, lollo rosso and red oak leaf as red-leafed genotypes and butterhead as green-leafed genotype, were studied. The influence of three nutrient solutions with low, medium and high ion concentrations, which varied in the macroanion (NO₃⁻) and macrocations (K⁺, Ca²⁺ and NH₄⁺), were compared in summer and winter. RESULTS: The nutrient solutions evaluated in this study for the production of lettuce in a soilless system did not strongly influence the quality characteristics of the raw material. When the ion concentration of the nutrient solution was increased, fresh weight decreased, although it depended on the genotype and season. Maturity index and dry matter content varied with the season but independently of the nutrient solution. In summer, maturity index was higher and dry matter lower than in winter. Initial texture and visual quality were not influenced by the nutrient solution. Medium ion concentration provided the highest content of vitamin C and phenolic compounds. Our observations pointed out that the genotype had a strong influence on the shelf life of the fresh-cut product with minor differences among nutrient solutions. In general, red-leafed lettuces showed the highest antioxidant content, helping the maintenance of sensory characteristics throughout storage. CONCLUSION: The combination of optimal nutrient solution ion concentration and suitable cultivar is considered essential to ensure lettuce post-cutting life.
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Claims 12
Claim · model-written summary
Nutrient solutions did not strongly affect raw lettuce quality characteristics.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- nutrient solutionse0
- Outcome
- quality characteristics of the raw materiale0
- Direction
- did not strongly influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nutrient solutions evaluated in this study for the production of lettuce in a soilless system did not strongly influence the quality characteristics of the raw material.”
Claim · model-written summary
Increasing nutrient solution ion concentration decreased fresh weight, depending on genotype and season.
- Taxon
- lettuceLactuca sativat0
- Treatment
- ion concentration of the nutrient solutione0
- Outcome
- fresh weighte0
- Direction
- decreasede0
- Qualifier
- depended on the genotype and seasone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the ion concentration of the nutrient solution was increased, fresh weight decreased, although it depended on the genotype and season.”
t0“fresh‐cut red and green lettuces (Lactuca sativa L.)”
Claim · model-written summary
Maturity index varied with season independently of nutrient solution.
- Taxon
- lettuceLactuca sativat0
- Treatment
- nutrient solutione0
- Outcome
- Maturity indexe0
- Qualifier
- seasone0
Not reportedComparatorSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maturity index and dry matter content varied with the season but independently of the nutrient solution.”
t0“fresh‐cut red and green lettuces (Lactuca sativa L.)”
Claim · model-written summary
Dry matter content varied with season independently of nutrient solution.
- Taxon
- lettuceLactuca sativat0
- Treatment
- nutrient solutione0
- Outcome
- dry matter contente0
- Qualifier
- seasone0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maturity index and dry matter content varied with the season but independently of the nutrient solution.”
t0“fresh‐cut red and green lettuces (Lactuca sativa L.)”
Claim · model-written summary
Maturity index was higher in summer than winter.
- Taxon
- lettuceLactuca sativat0
- Outcome
- maturity indexe0
- Direction
- highere0
- Comparator
- wintere0
- Setting
- summere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In summer, maturity index was higher and dry matter lower than in winter.”
t0“fresh‐cut red and green lettuces (Lactuca sativa L.)”
Claim · model-written summary
Dry matter was lower in summer than winter.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In summer, maturity index was higher and dry matter lower than in winter.”
t0“fresh‐cut red and green lettuces (Lactuca sativa L.)”
Claim · model-written summary
Nutrient solution did not influence initial texture and visual quality.
- Taxon
- lettuceLactuca sativat0
- Treatment
- nutrient solutione0
- Outcome
- Initial texture and visual qualitye0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Initial texture and visual quality were not influenced by the nutrient solution.”
t0“fresh‐cut red and green lettuces (Lactuca sativa L.)”
Claim · model-written summary
Medium ion concentration gave the highest vitamin C and phenolic compound content.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Medium ion concentratione0
- Outcome
- content of vitamin C and phenolic compoundse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Medium ion concentration provided the highest content of vitamin C and phenolic compounds.”
t0“fresh‐cut red and green lettuces (Lactuca sativa L.)”
Claim · model-written summary
Genotype strongly influenced shelf life, with minor differences among nutrient solutions.
- Taxon
- lettuceLactuca sativat0
- Material
- genotypee0
- Outcome
- shelf life of the fresh-cut producte0
- Qualifier
- minor differences among nutrient solutionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the genotype had a strong influence on the shelf life of the fresh-cut product with minor differences among nutrient solutions.”
t0“fresh‐cut red and green lettuces (Lactuca sativa L.)”
Claim · model-written summary
Red-leafed lettuces generally had the highest antioxidant content.
Verbatim
e0“red-leafed lettuces showed the highest antioxidant content”
Claim · model-written summary
High antioxidant content helped maintain sensory characteristics throughout storage.
- Taxon
- red-leafed lettucese0
- Outcome
- maintenance of sensory characteristics throughout storagee0
- Qualifier
- highest antioxidant contente0
Not reportedOrgan / stage
Verbatim
e0“red-leafed lettuces showed the highest antioxidant content, helping the maintenance of sensory characteristics throughout storage.”
Claim · model-written summary
Optimal nutrient solution ion concentration and suitable cultivar are considered essential for lettuce post-cutting life.
- Taxon
- lettuceLactuca sativae0
- Outcome
- combination of optimal nutrient solution ion concentration and suitable cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of optimal nutrient solution ion concentration and suitable cultivar is considered essential to ensure lettuce post-cutting life.”
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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.