Abstract
Abstract A flavin‐like compound that accumulates in nutrient solutions of lettuce under osmotic stress is reportedly not a response associated with Fe stress [Cramer and Spurr, J. Plant Nutr. 8:709–719 (1985)]. We re‐examined both salt stress and iron stress in lettuce (Buttercrunch cv.) using four concentrations of chelated and non‐chelated iron. Lettuce was quite Fe efficient and plants grown with no Fe or very low Fe concentrations markedly decreased the pH of their nutrient solutions and experienced only a transient chlorosis. A yellow compound that these plants excreted in the nutrient solution was chromatographed on thin layer plates. The Rf value and fluorescence spectral characteristics of this compound corresponded to those of riboflavin. When plants received adequate Fe, NaCl or KCl in the nutrient solution did not cause roots to excrete riboflavin nor did these salts increase the excretion of riboflavin from Fe‐deficient plants. Salt‐stressed plants were smaller and excreted less riboflavin than those that were not salt stressed, regardless of Fe level. Plants that received Fe as FeSO4 (as in previous report) did not develop any obvious signs of iron chlorosis, but were not as green as those that received an equivalent concentration of Fe as Chel 138. Several factors may account for the discrepancy in the results of the two reports.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
With no or very low iron, lettuce markedly lowered nutrient solution pH.
- Taxon
- Lettuce
Lactuca sativae0 - Treatment
- no Fe or very low Fe concentrationse0
- Outcome
- pH of their nutrient solutionse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce was quite Fe efficient and plants grown with no Fe or very low Fe concentrations markedly decreased the pH of their nutrient solutions”
Claim · model-written summary
With no or very low iron, lettuce experienced only transient chlorosis.
- Taxon
- LettuceLactuca sativae0
- Treatment
- no Fe or very low Fe concentrationse0
- Outcome
- transient chlorosise0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lettuce was quite Fe efficient and plants grown with no Fe or very low Fe concentrations markedly decreased the pH of their nutrient solutions and experienced only a transient chlorosis”
Claim · model-written summary
The yellow compound excreted by iron deficient lettuce had chromatographic and spectral characteristics corresponding to riboflavin.
- Taxon
- lettuceLactuca sativae1
- Material
- Buttercrunch cv.e1
- Outcome
- yellow compounde0
- Qualifier
- corresponded to those of riboflavine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A yellow compound that these plants excreted in the nutrient solution was chromatographed on thin layer plates. The Rf value and fluorescence spectral characteristics of this compound corresponded to those of riboflavin”
e1“lettuce (Buttercrunch cv.)”
Claim · model-written summary
With adequate iron, NaCl did not cause lettuce roots to excrete riboflavin.
- Taxon
- lettuceLactuca sativae1
- Treatment
- NaCle0
- Outcome
- roots to excrete riboflavine0
- Direction
- did not causee0
- Qualifier
- adequate Fee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When plants received adequate Fe, NaCl or KCl in the nutrient solution did not cause roots to excrete riboflavin”
e1“lettuce (Buttercrunch cv.)”
Claim · model-written summary
With adequate iron, KCl did not cause lettuce roots to excrete riboflavin.
- Taxon
- lettuceLactuca sativae1
- Treatment
- KCle0
- Outcome
- roots to excrete riboflavine0
- Direction
- did not causee0
- Qualifier
- adequate Fee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When plants received adequate Fe, NaCl or KCl in the nutrient solution did not cause roots to excrete riboflavin”
e1“lettuce (Buttercrunch cv.)”
Claim · model-written summary
NaCl did not increase riboflavin excretion in iron deficient lettuce.
- Taxon
- lettuceLactuca sativae2
- Treatment
- NaCle1
- Outcome
- excretion of riboflavine0
- Direction
- nor did these salts increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nor did these salts increase the excretion of riboflavin from Fe‐deficient plants”
e1“NaCl or KCl”
e2“lettuce (Buttercrunch cv.)”
Claim · model-written summary
KCl did not increase riboflavin excretion in iron deficient lettuce.
- Taxon
- lettuceLactuca sativae2
- Treatment
- KCle1
- Outcome
- excretion of riboflavine0
- Direction
- nor did these salts increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nor did these salts increase the excretion of riboflavin from Fe‐deficient plants”
e1“NaCl or KCl”
e2“lettuce (Buttercrunch cv.)”
Claim · model-written summary
Salt stressed lettuce plants were smaller than unstressed plants regardless of iron level.
- Taxon
- lettuceLactuca sativae1
- Treatment
- Salt‐stressede0
- Outcome
- smallere0
- Direction
- smallere0
- Qualifier
- regardless of Fe levele0
- Comparator
- not salt stressede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt‐stressed plants were smaller and excreted less riboflavin than those that were not salt stressed, regardless of Fe level”
e1“lettuce (Buttercrunch cv.)”
Claim · model-written summary
Salt stressed lettuce excreted less riboflavin than unstressed plants regardless of iron level.
- Taxon
- lettuceLactuca sativae1
- Treatment
- Salt‐stressede0
- Outcome
- riboflavine0
- Direction
- lesse0
- Qualifier
- regardless of Fe levele0
- Comparator
- not salt stressede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt‐stressed plants were smaller and excreted less riboflavin than those that were not salt stressed, regardless of Fe level”
e1“lettuce (Buttercrunch cv.)”
Claim · model-written summary
Lettuce receiving FeSO4 showed no obvious iron chlorosis.
- Taxon
- lettuceLactuca sativae1
- Treatment
- FeSO4e0
- Outcome
- did not develop any obvious signs of iron chlorosise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants that received Fe as FeSO4 (as in previous report) did not develop any obvious signs of iron chlorosis”
e1“lettuce (Buttercrunch cv.)”
Claim · model-written summary
Lettuce receiving FeSO4 was less green than plants receiving an equivalent concentration of Fe as Chel 138.
- Taxon
- lettuceLactuca sativae2
- Treatment
- FeSO4e1
- Outcome
- greene0
- Direction
- not as greene0
- Comparator
- Fe as Chel 138e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but were not as green as those that received an equivalent concentration of Fe as Chel 138”
e1“Plants that received Fe as FeSO4”
e2“lettuce (Buttercrunch cv.)”
The same questions in other papers
sodium chloride · molecular: metabolites · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
iron atom · physiology: pigments · Lactuca sativa (garden lettuce)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
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.