Abstract
In two experiments the relation between cell size, ploidy level and nitrate concentration of genotypes of lettuce ( Lactuca saliva L.) was investigated. Artificial increase of cell size by application of gibberellic acid to young plants decreased the percentage dry weight and the concentration of organic acids in the plant sap and increased the nitrate concentration of the shoot. Application of chlormequat chloride caused the opposite effects. Tetraploid genotypes of lettuce had larger cells, a lower nitrate concentration and a higher concentration of organic solutes than diploid genotypes. Genotypical differences in nitrate concentration could not be explained by differences in cell size, but were consistently related to differences in concentration of organic acids in plant sap. The percentage dry weight of genotypes was positively correlated with the concentration of organic acids in plant sap. However, differences in nitrate concentration were also found among genotypes with comparable dry matter content. These differences could be caused by differences in partitioning of photosynthates over structural components and organic acids in the vacuoles. Mono‐saccharides seem to be less important than organic acids for explaining genotypical differences in nitrate level, because the concentration of monosaccharides was much lower than that of organic acids and because a negative relation between the concentration of monosaccharides and of nitrate was not found in every case. Genotypical differences in nitrate accumulation were not related to differences in osmolarity.
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Claims 14
Claim · model-written summary
Gibberellic acid increased cell size in young lettuce plants.
- Taxon
- lettuce
Lactuca sativat0 - Organ / stage
- young plantse0
- Treatment
- application of gibberellic acide0
- Outcome
- cell sizee0
- Direction
- increaseinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Artificial increase of cell size by application of gibberellic acid to young plants”
t0“lettuce”
Claim · model-written summary
Gibberellic acid reduced dry weight percentage and organic acid concentration in lettuce sap.
- Taxon
- lettuceLactuca sativat0
- Treatment
- application of gibberellic acide0
- Outcome
- percentage dry weight and the concentration of organic acids in the plant sape0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of gibberellic acid to young plants decreased the percentage dry weight and the concentration of organic acids in the plant sap”
t0“lettuce”
Claim · model-written summary
Gibberellic acid increased shoot nitrate concentration.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- shoote0
- Treatment
- application of gibberellic acide0
- Outcome
- nitrate concentration of the shoote0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of gibberellic acid to young plants decreased the percentage dry weight and the concentration of organic acids in the plant sap and increased the nitrate concentration of the shoot”
t0“lettuce”
Claim · model-written summary
Chlormequat chloride had the opposite effects to gibberellic acid on dry weight, sap organic acids and shoot nitrate.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Application of chlormequat chloridee0
- Outcome
- opposite effectse0
- Direction
- opposite effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of chlormequat chloride caused the opposite effects”
t0“lettuce”
Claim · model-written summary
Tetraploid lettuce genotypes had larger cells than diploid genotypes.
- Taxon
- lettuceLactuca sativae0
- Material
- Tetraploid genotypese0
- Outcome
- cellse0
- Direction
- largere0
- Comparator
- diploid genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tetraploid genotypes of lettuce had larger cells, a lower nitrate concentration and a higher concentration of organic solutes than diploid genotypes”
Claim · model-written summary
Tetraploid lettuce genotypes had lower nitrate concentration than diploid genotypes.
- Taxon
- lettuceLactuca sativae0
- Material
- Tetraploid genotypese0
- Outcome
- nitrate concentratione0
- Direction
- lowere0
- Comparator
- diploid genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tetraploid genotypes of lettuce had larger cells, a lower nitrate concentration and a higher concentration of organic solutes than diploid genotypes”
Claim · model-written summary
Tetraploid lettuce genotypes had higher organic solute concentration than diploid genotypes.
- Taxon
- lettuceLactuca sativae0
- Material
- Tetraploid genotypese0
- Outcome
- concentration of organic solutese0
- Direction
- highere0
- Comparator
- diploid genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tetraploid genotypes of lettuce had larger cells, a lower nitrate concentration and a higher concentration of organic solutes than diploid genotypes”
Claim · model-written summary
Genotype differences in nitrate concentration were not explained by cell size.
- Taxon
- lettuceLactuca sativat0
- Material
- Genotypicale0
- Outcome
- nitrate concentratione0
- Qualifier
- could not be explained by differences in cell sizee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypical differences in nitrate concentration could not be explained by differences in cell size”
t0“lettuce”
Claim · model-written summary
Genotype differences in nitrate concentration were consistently related to sap organic acid concentration.
- Taxon
- lettuceLactuca sativat0
- Organ / stage
- plant sape0
- Compound
- organic acidse0
- Outcome
- nitrate concentratione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypical differences in nitrate concentration could not be explained by differences in cell size, but were consistently related to differences in concentration of organic acids in plant sap”
t0“lettuce”
Claim · model-written summary
Genotype dry weight percentage was positively correlated with sap organic acid concentration.
- Taxon
- lettuceLactuca sativat0
- Compound
- organic acidse0
- Outcome
- percentage dry weighte0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage dry weight of genotypes was positively correlated with the concentration of organic acids in plant sap”
t0“lettuce”
Claim · model-written summary
Nitrate concentration differed among genotypes with comparable dry matter content.
- Taxon
- lettuceLactuca sativat0
- Material
- genotypese0
- Outcome
- nitrate concentratione0
- Qualifier
- comparable dry matter contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences in nitrate concentration were also found among genotypes with comparable dry matter content”
t0“lettuce”
Claim · model-written summary
Monosaccharide concentration was much lower than organic acid concentration.
- Taxon
- lettuceLactuca sativat0
- Outcome
- concentration of monosaccharidese0
- Direction
- much lowere0
- Comparator
- organic acidse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of monosaccharides was much lower than that of organic acids”
t0“lettuce”
Claim · model-written summary
A negative relation between monosaccharide and nitrate concentrations was not found in every case.
- Taxon
- lettuceLactuca sativat0
- Compound
- monosaccharidese0
- Outcome
- nitratee0
- Qualifier
- not found in every casee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a negative relation between the concentration of monosaccharides and of nitrate was not found in every case”
t0“lettuce”
Claim · model-written summary
Genotype differences in nitrate accumulation were unrelated to osmolarity differences.
- Taxon
- lettuceLactuca sativat0
- Material
- Genotypicale0
- Outcome
- nitrate accumulatione0
- Qualifier
- not related to differences in osmolaritye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypical differences in nitrate accumulation were not related to differences in osmolarity”
t0“lettuce”
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See all 5 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.