Abstract
A 3:30 Ca:Mg ratio in the nutrient solution produces in tomato seedlings symptoms of Ca2+ deficit owing to excessive accumulation of Mg2+ ions and the depressed Ca2+ accumulation. As a result of this a decrease in dry weight increment and protein content is observed together with inhibition of nitrate reductase activity. A doubled Ca2+ dose in the nutrient solution, that is a change in the Ca:Mg ratio to 6:30 abolishes the external symptoms of Ca2+ deficit and reduces Mg2+ accumulation, that of Ca2+ ions remaining unchanged. At the same time an enhanced activity of nitrate reductase appears, reaching values close to those in control plants. Tomato seedlings grown on a 3-fold increased Ca2+ dose (Ca:Mg = 9:30) did not differ at all from the control ones. An in-crease in calcium concentration in the nutrient solution, the high magnesium dose remaining unchanged, causes enhanced K+ accumulation, and this may affect nitrate absorption and reduction. It would seem that Ca2+ deficit in plant tissues induced by excessive Mg2+ accumulation with unsuitable Ca:Mg ratio in the nutrient solution in cause of disorders in NO3 nitrogen assimilation.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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
A 3:30 calcium to magnesium ratio produced calcium-deficit symptoms in tomato seedlings.
- Taxon
- tomato seedlings
Solanum lycopersicume0 - Treatment
- 3:30 Ca:Mg ratioe0
- Outcome
- symptoms of Ca2+ deficite0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 3:30 Ca:Mg ratio in the nutrient solution produces in tomato seedlings symptoms of Ca2+ deficit”
Claim · model-written summary
At 3:30 Ca:Mg, seedling dry-weight increment and protein content decreased.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- increasing calcium dosest0
- Outcome
- dry weight increment and protein contente0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a result of this a decrease in dry weight increment and protein content is observed”
t0“tomato seedlings. II. Effect of increasing calcium doses in the presence of high magnesium concentrations”
Claim · model-written summary
At 3:30 Ca:Mg, nitrate reductase activity was inhibited.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- increasing calcium dosest0
- Outcome
- nitrate reductase activitye0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of nitrate reductase activity”
t0“tomato seedlings. II. Effect of increasing calcium doses”
Claim · model-written summary
Doubling calcium to 6:30 removed external calcium-deficit symptoms.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- doubled Ca2+ dosee0
- Outcome
- external symptoms of Ca2+ deficite0
- Direction
- abolishese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A doubled Ca2+ dose in the nutrient solution, that is a change in the Ca:Mg ratio to 6:30 abolishes the external symptoms of Ca2+ deficit”
t0“tomato seedlings”
Claim · model-written summary
Doubling calcium to 6:30 reduced magnesium accumulation.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- increasing calcium dosest0
- Outcome
- Mg2+ accumulatione0
- Direction
- reducese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduces Mg2+ accumulation”
t0“tomato seedlings. II. Effect of increasing calcium doses”
Claim · model-written summary
Calcium accumulation remained unchanged with the doubled calcium dose.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- increasing calcium dosest0
- Outcome
- Ca2+ ionse0
- Direction
- remaining unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that of Ca2+ ions remaining unchanged”
t0“tomato seedlings. II. Effect of increasing calcium doses”
Claim · model-written summary
Nitrate reductase activity increased to near-control values with doubled calcium.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- increasing calcium dosest0
- Outcome
- activity of nitrate reductasee0
- Direction
- enhancede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an enhanced activity of nitrate reductase appears, reaching values close to those in control plants”
t0“tomato seedlings. II. Effect of increasing calcium doses”
Claim · model-written summary
Seedlings at 9:30 Ca:Mg did not differ from controls.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- 3-fold increased Ca2+ dose (Ca:Mg = 9:30)e0
- Outcome
- did not differ at alle0
- Direction
- did not differ at alle0
- Comparator
- control onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings grown on a 3-fold increased Ca2+ dose (Ca:Mg = 9:30) did not differ at all from the control ones”
Claim · model-written summary
Increasing calcium under high magnesium enhanced potassium accumulation.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Treatment
- in-crease in calcium concentratione0
- Outcome
- K+ accumulatione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An in-crease in calcium concentration in the nutrient solution, the high magnesium dose remaining unchanged, causes enhanced K+ accumulation”
t0“tomato seedlings”
Claim · model-written summary
Authors suggest greater potassium accumulation could affect nitrate absorption and reduction.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Outcome
- nitrate absorption and reductione0
- Qualifier
- may affecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this may affect nitrate absorption and reduction”
t0“tomato seedlings”
Claim · model-written summary
Authors suggest tissue calcium deficit induced by magnesium accumulation causes nitrate assimilation disorders.
- Taxon
- tomato seedlingsSolanum lycopersicumt0
- Outcome
- disorders in NO3 nitrogen assimilatione0
- Qualifier
- Ca2+ deficit in plant tissues induced by excessive Mg2+ accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ca2+ deficit in plant tissues induced by excessive Mg2+ accumulation with unsuitable Ca:Mg ratio in the nutrient solution in cause of disorders in NO3 nitrogen assimilation”
t0“tomato seedlings”
The same questions in other papers
calcium atom · disease · Solanum lycopersicum (tomato)Results differ
14 papers in the same direction as this paper · 35 in the opposite direction
- positive
- positive
- positive
46 papers more in this group
See all 50 papers →calcium atom · quality: protein · Solanum lycopersicum (tomato)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
calcium atom · physiology: ion balance · Solanum lycopersicum (tomato)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
4 papers more in this group
See all 8 papers →calcium atom · molecular: metabolites · Solanum lycopersicum (tomato)Positive and negative results
15 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- no effect
18 papers more in this group
See all 22 papers →magnesium atom · disease · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- negative
calcium(2+) · disease · Solanum lycopersicum (tomato)Results agree
2 papers in the same direction as this paper
- positive
- positive
calcium atom · physiology: enzyme activity · Solanum lycopersicum (tomato)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.