Abstract
Boron (B) toxicity has become important in areas close to the Mediterranean Sea where intensive agriculture has been developed. The objective of this research was to study the effects of B toxicity (0.5 mM and 2.0 mM B) on nitrogen (N) assimilation of two tomato cultivars that are often used in these areas. Leaf biomass, relative leaf growth rate (RGR(L)), concentration of B, nitrate (NO(3) (-)), ammonium (NH(4) (+)), organic N, amino acids and soluble proteins, as well as nitrate reductase (NR), nitrite reductase (NiR), glutamine synthase (GS), glutamate synthetase (GOGAT) and glutamate dehydrogenase (GDH) activities were analysed in leaves. Boron toxicity significantly decreased leaf biomass, RGR(L), organic N, soluble proteins, and NR and NiR activities. The lowest NO(3) (-) and NH(4) (+) concentration in leaves was recorded when plants were supplied with 2.0 mM B in the root medium. Total B, amino acids, activities of GS, GOGAT and GDH increased under B toxicity. Data from the present study prove that B toxicity causes inhibition of NO(3) (-) reduction and increases NH(4) (+) assimilation in tomato plants.
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Claims 7
Claim · model-written summary
Boron toxicity decreased leaf biomass and relative growth rate.
- Taxon
- tomato plants
Solanum lycopersicume1 - Treatment
- Boron toxicitye0
- Outcome
- leaf biomass, RGR(L)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Boron toxicity significantly decreased leaf biomass, RGR(L)”
e1“tomato plants”
Claim · model-written summary
Boron toxicity decreased organic nitrogen and soluble proteins.
- Taxon
- tomato plantsSolanum lycopersicume1
- Treatment
- Boron toxicitye0
- Outcome
- organic N, soluble proteinse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Boron toxicity significantly decreased leaf biomass, RGR(L), organic N, soluble proteins”
e1“tomato plants”
Claim · model-written summary
Boron toxicity decreased NR and NiR activities.
- Taxon
- tomato plantsSolanum lycopersicume1
- Treatment
- Boron toxicitye0
- Outcome
- NR and NiR activitiese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Boron toxicity significantly decreased leaf biomass, RGR(L), organic N, soluble proteins, and NR and NiR activities”
e1“tomato plants”
Claim · model-written summary
Leaves had the lowest nitrate at 2.0 mM boron.
- Taxon
- tomato plantsSolanum lycopersicume1
- Treatment
- 2.0 mM Be0
- Outcome
- NO(3) (-)e0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest NO(3) (-) and NH(4) (+) concentration in leaves was recorded when plants were supplied with 2.0 mM B in the root medium”
e1“tomato plants”
Claim · model-written summary
Leaves had the lowest ammonium at 2.0 mM boron.
- Taxon
- tomato plantsSolanum lycopersicume1
- Treatment
- 2.0 mM Be0
- Outcome
- NH(4) (+) concentratione0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest NO(3) (-) and NH(4) (+) concentration in leaves was recorded when plants were supplied with 2.0 mM B in the root medium”
e1“tomato plants”
Claim · model-written summary
Boron toxicity increased total boron and amino acids.
- Taxon
- tomato plantsSolanum lycopersicume1
- Treatment
- B toxicitye0
- Outcome
- Total B, amino acidse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total B, amino acids, activities of GS, GOGAT and GDH increased under B toxicity”
e1“tomato plants”
Claim · model-written summary
Boron toxicity increased GS, GOGAT and GDH activities.
- Taxon
- tomato plantsSolanum lycopersicume1
- Treatment
- B toxicitye0
- Outcome
- activities of GS, GOGAT and GDHe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total B, amino acids, activities of GS, GOGAT and GDH increased under B toxicity”
e1“tomato plants”
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