Abstract
Nickel (Ni) is the most recently discovered essential element for higher plants. But there is limited information about the effect of this element on yield and nitrogen (N) metabolism of different plants. In this research, the interaction of Ni supplement and N source was studied on nitrate accumulation and growth of lettuce (Lactuca sativa L. cv. Baker) in solution culture. In a greenhouse experiment, lettuce plants were exposed to two Ni levels (0 and 0.04 μM in the form of NiCl2) and three N levels (5, 10, and 20 μM in the form of urea and ammonium nitrate). The plants were harvested 6 weeks after transplanting and the fresh weight of shoots and roots, total N concentration, nitrate concentration and Fe content of shoots were determined. The results indicated that shoot and root fresh weight of nitrate-fed plants were higher than urea-fed plants. Ni nutrition significantly enhanced the yield of urea-fed plants. The shoot nitrate concentration in nitrate-fed plants was significantly greater in comparison with urea-fed plants. On the other hand, nitrate concentration in the shoots of lettuce plants decreased significantly with Ni nutrition. Ni supplementation in urea-fed plants increased the shoot Fe content. The shoot concentration of total-N in the urea-fed plants increased with the Ni supplement. While, Ni had no significant effect on shoot concentration of total-N in the nitrate-fed plants. Addition of low levels of Ni to the nutrient solution, particularly to the urea-containing solution, improved the yield of lettuce. In addition, these plant leaves are safer for human consumption because the shoot nitrate content is significantly reduced by application of Ni.
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Claims 7
Claim · model-written summary
Nitrate-fed lettuce had greater shoot and root fresh weight than urea-fed lettuce.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- nitrate-fede0
- Outcome
- shoot and root fresh weighte0
- Direction
- highere0
- Comparator
- urea-fed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot and root fresh weight of nitrate-fed plants were higher than urea-fed plants.”
t0“lettuce”
Claim · model-written summary
Nickel significantly enhanced yield of urea-fed lettuce.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Ni nutritione0
- Outcome
- yield of urea-fed plantse0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni nutrition significantly enhanced the yield of urea-fed plants.”
t0“lettuce”
Claim · model-written summary
Nitrate-fed plants had greater shoot nitrate concentration than urea-fed plants.
- Taxon
- lettuceLactuca sativat0
- Treatment
- nitrate-fede0
- Outcome
- shoot nitrate concentratione0
- Direction
- greatere0
- Comparator
- urea-fed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shoot nitrate concentration in nitrate-fed plants was significantly greater in comparison with urea-fed plants.”
t0“lettuce”
Claim · model-written summary
Nickel significantly decreased shoot nitrate concentration.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Ni nutritione0
- Outcome
- nitrate concentration in the shootse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate concentration in the shoots of lettuce plants decreased significantly with Ni nutrition.”
Claim · model-written summary
Nickel increased shoot iron content in urea-fed plants.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Ni supplementatione0
- Outcome
- shoot Fe contente0
- Direction
- increasede0
- Qualifier
- urea-fed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni supplementation in urea-fed plants increased the shoot Fe content.”
t0“lettuce”
Claim · model-written summary
Nickel increased total shoot nitrogen in urea-fed plants.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Ni supplemente0
- Outcome
- shoot concentration of total-Ne0
- Direction
- increasede0
- Qualifier
- urea-fed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shoot concentration of total-N in the urea-fed plants increased with the Ni supplement.”
t0“lettuce”
Claim · model-written summary
Nickel did not significantly affect total shoot nitrogen in nitrate-fed plants.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Nie0
- Outcome
- shoot concentration of total-Ne0
- Direction
- no significant effecte0
- Qualifier
- nitrate-fed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni had no significant effect on shoot concentration of total-N in the nitrate-fed plants.”
t0“lettuce”
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See all 85 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.