Abstract
Summary Lactuca sativa L. is one of the most important sources of phytonutrients including vitamins, carotenoids, and antioxidants. However, lettuce growth and quality are strongly affected by soil fertility. In this study, the influence of iron (Fe) and/or magnesium (Mg) deficiencies on the growth, anti-oxidant properties, and ferric chelate reductase (FCR) and phosphoenolpyruvate carboxylase (PEPC) activities in lettuce plants was studied, after 15 d of treatment. Deficiencies in Fe and Mg decreased the accumulation of fresh weight and the concentration of chlorophyll. Intracellular Fe and Mg concentrations were affected by Fe- and/or Mg-deficiency, especially by the combined deficiency. This study also showed that Fe- and Mg-deficiencies had antagonistic effects on the activities of FCR and PEPC. The activity of catalase (CAT) was not significantly altered by Mg-deficiency, but a significant decline in CAT activity was recorded in Fe-deficient shoots. This decline increased with the concentration of Mg in the medium. Moreover, guaiacol peroxidase (GPX) and ascorbate peroxidase (APX) activities were reduced by Fe-deficiency at normal levels of Mg, but were increased by Mg-deficiency at normal or low levels of Fe.
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Claims 8
Claim · model-written summary
Iron and magnesium deficiencies reduced lettuce fresh weight accumulation and chlorophyll concentration.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- Deficiencies in Fe and Mge1
- Outcome
- accumulation of fresh weight and the concentration of chlorophylle1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce plants”
e1“Deficiencies in Fe and Mg decreased the accumulation of fresh weight and the concentration of chlorophyll.”
Claim · model-written summary
Iron or magnesium deficiency affected intracellular iron and magnesium concentrations, especially under combined deficiency.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Fe- and/or Mg-deficiencye1
- Outcome
- Intracellular Fe and Mg concentrationse1
- Qualifier
- especially by the combined deficiencye1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce plants”
e1“Intracellular Fe and Mg concentrations were affected by Fe- and/or Mg-deficiency, especially by the combined deficiency.”
Claim · model-written summary
Iron and magnesium deficiencies had antagonistic effects on FCR and PEPC activities in lettuce.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Fe- and Mg-deficienciese1
- Gene
- FCR and PEPCe1
- Outcome
- activities of FCR and PEPCe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce plants”
e1“Fe- and Mg-deficiencies had antagonistic effects on the activities of FCR and PEPC.”
Claim · model-written summary
Magnesium deficiency did not significantly alter catalase activity.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Mg-deficiencye1
- Gene
- catalase (CAT)e1
- Outcome
- activity of catalase (CAT)e1
- Direction
- not significantly alterede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce plants”
e1“The activity of catalase (CAT) was not significantly altered by Mg-deficiency”
Claim · model-written summary
Iron deficiency significantly lowered catalase activity in lettuce shoots.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- shootse1
- Treatment
- Fe-deficiente1
- Gene
- CATe1
- Outcome
- CAT activitye1
- Direction
- declinee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce plants”
e1“a significant decline in CAT activity was recorded in Fe-deficient shoots”
Claim · model-written summary
The decline in catalase activity increased with magnesium concentration in the medium.
- Taxon
- lettuceLactuca sativae0
- Compound
- Mge1
- Outcome
- This declinee1
- Direction
- increasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce plants”
e1“This decline increased with the concentration of Mg in the medium.”
Claim · model-written summary
Iron deficiency reduced GPX and APX activities at normal magnesium levels.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Fe-deficiencye1
- Outcome
- guaiacol peroxidase (GPX) and ascorbate peroxidase (APX) activitiese1
- Direction
- reducede1
- Qualifier
- at normal levels of Mge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce plants”
e1“guaiacol peroxidase (GPX) and ascorbate peroxidase (APX) activities were reduced by Fe-deficiency at normal levels of Mg”
Claim · model-written summary
Magnesium deficiency increased GPX and APX activities at normal or low iron levels.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Mg-deficiencye1
- Outcome
- guaiacol peroxidase (GPX) and ascorbate peroxidase (APX) activitiese1
- Direction
- increasede1
- Qualifier
- at normal or low levels of Fee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lettuce plants”
e1“guaiacol peroxidase (GPX) and ascorbate peroxidase (APX) activities were reduced by Fe-deficiency at normal levels of Mg, but were increased by Mg-deficiency at normal or low levels of Fe”
The same questions in other papers
iron atom · physiology: pigments · Lactuca sativa (garden lettuce)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- 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.