Abstract
Although nickel (Ni) is known as an essential element for higher plants, the biological effects of this nutrient on growth, yield, and N metabolism of some plants, particularly leafy vegetables, is still unknown. Therefore, this study was carried out to investigate the effects of Ni and urea nutrition on the growth and yield of lettuce (Lactuca sativa L. cv. Baker) and urea accumulation in plant tissues. In this study, nitrogen was supplied from the source of urea or ammonium nitrate at three levels (5, 10 and 20 mM) and Ni was supplied in the form of NiCl2 at two levels (0 and 0.04 μM). The plants were harvested 6 weeks after transplanting and the fresh weight of shoots and roots were determined. The shoots urea concentration and activity of urease enzyme in the leaves were also measured. The results indicated that shoots fresh weight of the urea-fed plants increased with increasing urea concentration in the nutrient solution. Addition of Ni to the nutrient solution significantly promoted the root and shoots fresh weight of urea-fed plants, regardless of N level. Ni nutrition significantly increased the urease activity in the lettuce leaves and as a result, reduced urea accumulation in the shoots and toxicity effects of urea. Therefore, it seems that urea in combination with Ni can successfully be used in production of lettuce in soilless culture systems.
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Claims 7
Claim · model-written summary
Shoot fresh weight increased with urea concentration.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- increasing urea concentratione0
- Outcome
- shoots fresh weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoots fresh weight of the urea-fed plants increased with increasing urea concentration in the nutrient solution.”
t0“lettuce”
Claim · model-written summary
Nickel significantly increased root fresh weight of urea-fed lettuce.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Addition of Nie0
- Outcome
- root and shoots fresh weighte0
- Direction
- promotede0
- Qualifier
- regardless of N levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of Ni to the nutrient solution significantly promoted the root and shoots fresh weight of urea-fed plants, regardless of N level.”
t0“lettuce”
Claim · model-written summary
Nickel significantly increased shoot fresh weight of urea-fed lettuce.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Addition of Nie0
- Outcome
- shoots fresh weighte0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of Ni to the nutrient solution significantly promoted the root and shoots fresh weight of urea-fed plants, regardless of N level.”
t0“lettuce”
Claim · model-written summary
Nickel significantly increased lettuce leaf urease activity.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- leavese0
- Treatment
- Ni nutritione0
- Gene
- ureasee0
- Outcome
- urease activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni nutrition significantly increased the urease activity in the lettuce leaves”
Claim · model-written summary
Nickel reduced shoot urea accumulation.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- shootse0
- Treatment
- Ni nutritione0
- Outcome
- urea accumulatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni nutrition significantly increased the urease activity in the lettuce leaves and as a result, reduced urea accumulation in the shoots”
Claim · model-written summary
Nickel reduced urea toxicity effects.
- Taxon
- lettuceLactuca sativae0
- Treatment
- Ni nutritione0
- Outcome
- toxicity effects of ureae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni nutrition significantly increased the urease activity in the lettuce leaves and as a result, reduced urea accumulation in the shoots and toxicity effects of urea.”
Claim · model-written summary
Authors suggest urea with nickel for soilless lettuce production.
- Taxon
- lettuceLactuca sativae0
- Outcome
- urea in combination with Ni can successfully be used in production of lettuce in soilless culture systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“urea in combination with Ni can successfully be used in production of lettuce in soilless culture systems.”
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