Abstract
Abstract Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse to investigate the interaction of phosphorus (P) and calcium (Ca) under saline conditions on vegetative biomass and cation balance. Three levels of Ca (0.4, 2, and 8 mM) were combined factorially with two levels of phosphate (0.1 and 1 mM) under two regimes of NaCl salinity (10 and 80 mM). An increase of phosphate and salinity level decreased shoot and root growth. A strong antagonism between Ca and magnesium (Mg) was observed regardless of the salinity level. Calcium effect on growth depended on the salinity level. At low salinity, an increase of Ca reduced sodium (Na) concentration in all plant fractions. At high salinity, this effect was only significant in young and medium leaves. At low salinity and low Ca the reduction of growth could be due to Na toxicity and an unbalanced Ca/Mg ratio. In addition to that, at high salinity, the restoration of growth by increasing Ca concentration in the root medium could be due to an effect on water relation and by increasing potassium K/Na selectivity.
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Claims 9
Claim · model-written summary
Increasing phosphate decreased melon shoot and root growth.
- Taxon
- Melon
.jpg?width=60)
Cucumis meloe1 - Treatment
- increase of phosphatee0
- Outcome
- shoot and root growthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“An increase of phosphate and salinity level decreased shoot and root growth”
e1“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
Claim · model-written summary
Increasing salinity decreased melon shoot and root growth.
- Taxon
- MelonCucumis meloe1
- Treatment
- salinity levele0
- Outcome
- shoot and root growthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase of phosphate and salinity level decreased shoot and root growth”
e1“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
Claim · model-written summary
Calcium and magnesium showed strong antagonism at either salinity level in melon.
- Taxon
- MelonCucumis meloe1
- Compound
- Cae0
- Outcome
- antagonism between Ca and magnesium (Mg)e0
- Qualifier
- regardless of the salinity levele0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A strong antagonism between Ca and magnesium (Mg) was observed regardless of the salinity level”
e1“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
Claim · model-written summary
The effect of calcium on melon growth depended on salinity level.
- Taxon
- MelonCucumis meloe1
- Treatment
- Calciume0
- Outcome
- growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calcium effect on growth depended on the salinity level”
e1“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
Claim · model-written summary
At low salinity, increased calcium reduced sodium concentration in all melon plant fractions.
- Taxon
- MelonCucumis meloe1
- Treatment
- increase of Cae0
- Outcome
- sodium (Na) concentratione0
- Direction
- reducede0
- Qualifier
- At low salinitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low salinity, an increase of Ca reduced sodium (Na) concentration in all plant fractions”
e1“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
Claim · model-written summary
At high salinity, increased calcium significantly reduced sodium concentration only in young and medium melon leaves.
- Taxon
- MelonCucumis meloe2
- Organ / stage
- young and medium leavese0
- Treatment
- increase of Cae1
- Outcome
- sodium (Na) concentratione1
- Direction
- reducede1
- Qualifier
- At high salinitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At high salinity, this effect was only significant in young and medium leaves”
e1“At low salinity, an increase of Ca reduced sodium (Na) concentration in all plant fractions”
e2“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
Claim · model-written summary
At high salinity, increasing calcium in the root medium restored melon growth.
- Taxon
- MelonCucumis meloe1
- Treatment
- increasing Ca concentration in the root mediume0
- Outcome
- growthe0
- Direction
- restoratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at high salinity, the restoration of growth by increasing Ca concentration in the root medium”
e1“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
Claim · model-written summary
The authors suggest that sodium toxicity and an unbalanced calcium/magnesium ratio could explain reduced melon growth under low salinity and calcium.
- Taxon
- MelonCucumis meloe1
- Compound
- Nae0
- Outcome
- reduction of growthe0
- Qualifier
- unbalanced Ca/Mg ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low salinity and low Ca the reduction of growth could be due to Na toxicity and an unbalanced Ca/Mg ratio”
e1“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
Claim · model-written summary
The authors suggest that water relations and greater potassium/sodium selectivity could explain growth restoration by calcium at high salinity.
- Taxon
- MelonCucumis meloe1
- Treatment
- increasing Ca concentration in the root mediume0
- Outcome
- restoration of growthe0
- Qualifier
- water relation and by increasing potassium K/Na selectivitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at high salinity, the restoration of growth by increasing Ca concentration in the root medium could be due to an effect on water relation and by increasing potassium K/Na selectivity”
e1“Melon (Cucumis melo L.) plants were grown hydroponically in a greenhouse”
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See all 23 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.