Abstract
Abstract BACKGROUND Excessive rates of nitrogen (N) fertilizers may result in elevated concentrations of nitrate ( NO 3 − ) in plants. Considering that many programs of biofortification with trace elements are being performed, it has become important to study how the application of these elements affects plant physiology and, particularly, N utilization in leaf crops. The main objective of the present study was to determine whether the NO 3 − accumulation and the nitrogen use efficiency was affected by the application of different doses of Zn in Lactuca sativa plants. RESULTS Zn doses in the range 80–100 µmol L −1 produced an increase in Zn concentration provoking a decrease of NO 3 − concentration and increase of the nitrate reductase, glutamine synthetase and aspartate aminotransferase activities, as well as the photorespiration processes. As result, we observed an increase in reduced N, total N concentration and N utilization efficiency. Consequently, at a dose of 80 µmol L −1 of Zn, the amino acid concentration increased significantly. CONCLUSION Adequate Zn fertilization is an important critical player in lettuce, especially at a dose of 80 µmol L −1 of Zn, because it could result in an increase in the Zn concentration, a reduction of NO 3 − levels and an increase the concentration of essential amino acids, with all of them having beneficial properties for the human diet. © 2016 Society of Chemical Industry
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Claims 6
Claim · model-written summary
Zn doses of 80–100 µmol L −1 increased plant Zn concentration.
- Taxon
- Lactuca sativa
Lactuca sativat0 - Treatment
- Zn doses in the range 80–100 µmol L −1e0
- Outcome
- Zn concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn doses in the range 80–100 µmol L −1 produced an increase in Zn concentration”
t0“Lactuca sativa L”
Claim · model-written summary
Zn doses of 80–100 µmol L −1 decreased nitrate concentration.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- Zn doses in the range 80–100 µmol L −1e0
- Outcome
- NO 3 − concentratione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn doses in the range 80–100 µmol L −1 produced an increase in Zn concentration provoking a decrease of NO 3 − concentration”
t0“Lactuca sativa L”
Claim · model-written summary
Zn doses increased nitrate reductase, glutamine synthetase and aspartate aminotransferase activities.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- Zn doses in the range 80–100 µmol L −1e0
- Outcome
- nitrate reductase, glutamine synthetase and aspartate aminotransferase activitiese0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn doses in the range 80–100 µmol L −1 produced an increase in Zn concentration provoking a decrease of NO 3 − concentration and increase of the nitrate reductase, glutamine synthetase and aspartate aminotransferase activities”
t0“Lactuca sativa L”
Claim · model-written summary
Zn doses increased photorespiration processes.
- Taxon
- Lactuca sativaLactuca sativat0
- Outcome
- photorespiration processese0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as well as the photorespiration processes”
t0“Lactuca sativa L”
Claim · model-written summary
Zn treatment increased reduced N, total N concentration and N utilization efficiency.
- Taxon
- Lactuca sativaLactuca sativat0
- Outcome
- reduced N, total N concentration and N utilization efficiencye0
- Direction
- increasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As result, we observed an increase in reduced N, total N concentration and N utilization efficiency.”
t0“Lactuca sativa L”
Claim · model-written summary
At 80 µmol L −1 Zn, amino acid concentration increased significantly.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- 80 µmol L −1 of Zne0
- Outcome
- amino acid concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at a dose of 80 µmol L −1 of Zn, the amino acid concentration increased significantly.”
t0“Lactuca sativa L”
The same questions in other papers
zinc atom · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
13 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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See all 16 papers →zinc atom · physiology: enzyme activity · Lactuca sativa (garden lettuce)Results agree
1 paper in the same direction as this paper
- positive
zinc atom · molecular: metabolites · Lactuca sativa (garden lettuce)Results agree
2 papers in the same direction as this paper
- 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.