Abstract
Upland rice plants, cultivar ‘IAC 202,’ were grown in nutrient solution until full tillering. Treatments consisted of ammonium nitrate (AN) or urea (UR) as nitrogen (N) source plus molybdenum (Mo) and/or nickel (Ni): AN + Mo + Ni, AN + Mo − Ni, AN − Mo + Ni, UR + Mo + Ni, UR + Mo − Ni, and UR − Mo + Ni. The experiment was carried out to better understand the effect of these treatments on dry‐matter yield, chlorophyll, net photosynthesis rate, nitrate (NO3 −‐N), total N, in vitro activities of urease and nitrate reductase (NR), and Mo and Ni concentrations. In UR‐grown plants, Mo and Ni addition increased yield of dry matter. Regardless of the N source, chlorophyll concentration and net photosynthesis rate were reduced when Mo or Ni were omitted, although not always significantly. The omission of either Mo or Ni led to a decrease in urease activity, independent of N source. Nitrate reductase activity increased in nutrient solutions without Mo, although NO3 −‐N increased. There was not a consistent variation in total N concentration. Molybdenum and Ni concentration in roots and shoots were influenced by their supply in the nutrient solution. Molybdenum concentration was not influenced by N sources, whereas Ni content in both root and shoots was greater in ammonium nitrate–grown plants. In conclusion, it can be hypothesized that there is a relationship between Mo and Ni acting on photosynthesis, although is an indirect one. This is the first evidence for a beneficial effect of Mo and Ni interaction on plant growth.
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Claims 10
Claim · model-written summary
Mo and Ni addition increased dry-matter yield in urea-grown rice.
- Taxon
- Rice
Oryza sativat0 - Treatment
- Mo and Ni additione0
- Outcome
- yield of dry mattere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“In UR‐grown plants, Mo and Ni addition increased yield of dry matter.”
Claim · model-written summary
Omitting Mo or Ni reduced chlorophyll concentration and net photosynthesis rate regardless of N source, though not always significantly.
- Taxon
- RiceOryza sativat0
- Treatment
- Mo or Ni were omittede0
- Outcome
- chlorophyll concentration and net photosynthesis ratee0
- Direction
- reducede0
- Qualifier
- although not always significantlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“Regardless of the N source, chlorophyll concentration and net photosynthesis rate were reduced when Mo or Ni were omitted, although not always significantly.”
Claim · model-written summary
Omitting either Mo or Ni decreased urease activity independently of N source.
- Taxon
- RiceOryza sativat0
- Treatment
- omission of either Mo or Nie0
- Outcome
- urease activitye0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“The omission of either Mo or Ni led to a decrease in urease activity, independent of N source.”
Claim · model-written summary
Nitrate reductase activity increased without Mo.
- Taxon
- RiceOryza sativat0
- Treatment
- without Moe0
- Outcome
- Nitrate reductase activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“Nitrate reductase activity increased in nutrient solutions without Mo, although NO3 −‐N increased.”
Claim · model-written summary
NO3 −‐N increased in nutrient solutions without Mo.
- Taxon
- RiceOryza sativat0
- Treatment
- without Moe0
- Outcome
- NO3 −‐Ne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“Nitrate reductase activity increased in nutrient solutions without Mo, although NO3 −‐N increased.”
Claim · model-written summary
Total N concentration did not vary consistently.
- Taxon
- RiceOryza sativat0
- Outcome
- total N concentratione0
- Direction
- not a consistent variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“There was not a consistent variation in total N concentration.”
Claim · model-written summary
Root and shoot Mo and Ni concentrations responded to their supply in nutrient solution.
- Taxon
- RiceOryza sativat0
- Treatment
- their supply in the nutrient solutione0
- Outcome
- Molybdenum and Ni concentration in roots and shootse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“Molybdenum and Ni concentration in roots and shoots were influenced by their supply in the nutrient solution.”
Claim · model-written summary
Mo concentration was not influenced by N source.
- Taxon
- RiceOryza sativat0
- Treatment
- N sourcese0
- Outcome
- Molybdenum concentratione0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“Molybdenum concentration was not influenced by N sources”
Claim · model-written summary
Root and shoot Ni content was greater with ammonium nitrate than the other N source.
- Taxon
- RiceOryza sativat0
- Treatment
- ammonium nitratee0
- Outcome
- Ni content in both root and shootse0
- Direction
- greatere0
- Comparator
- ureae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“Ni content in both root and shoots was greater in ammonium nitrate–grown plants”
e1“ammonium nitrate (AN) or urea (UR) as nitrogen (N) source”
Claim · model-written summary
The authors hypothesize an indirect Mo–Ni relationship affecting photosynthesis.
- Taxon
- RiceOryza sativat0
- Outcome
- photosynthesise0
- Qualifier
- relationship between Mo and Nie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Plants”
e0“it can be hypothesized that there is a relationship between Mo and Ni acting on photosynthesis, although is an indirect one”
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