Abstract
Nickel is considered to be an essential micronutrient in plants because of its role in the metalloenzyme urease. In order to characterize the metabolic consequences of Ni deprivation, the significance of Ni supply for growth and N metabolism of rice plants grown with either NH4NO3 or urea as sole N source was evaluated. Growth of plants receiving NH4NO3 was not affected by the Ni status, and neither were the activities of arginase and glutamine synthetase. However, urease activity was not detectable in leaves of low-Ni plants, which in conjunction with arginase action, led to the accumulation of urea in plants grown with NH4NO3. Amino acid contents and mineral nutrient status (except Ni) were not affected by the Ni treatment. Urea-grown Ni-deprived plants showed reduced growth and accumulated large amounts of urea owing to the lack of urease activity. These plants were further characterized by low amino acid contents indicating impaired usage of the N supplied. They also exhibited reduced levels of the urea precursor arginine, which is merely attributed to the overall N economy in these plant. When urea-grown plants were supplied with 0.5 mmol m−3 Ni in the nutrient solution, the dry weight and the amino acid N contents were increased at the expense of the urea contents, indicating efficient use of urea N in Ni-supplemented plants. A critical Ni concentration in the shoot regarding dry matter production of NH4NO3-grown plants could not be deduced, while 25 μg Ni kg−1 DW is certainly inadequate for urea-grown plants. This suggests that the Ni requirement strongly depends on the N source employed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 14
Claim · model-written summary
Nickel status did not affect growth with NH4NO3.
- Taxon
- rice
Oryza sativat0 - Treatment
- Ni statuse0
- Outcome
- Growthe0
- Direction
- not affectede0
- Comparator
- plants receiving NH4NO3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth of plants receiving NH4NO3 was not affected by the Ni status”
t0“rice”
Claim · model-written summary
Arginase and glutamine synthetase activities were unaffected by nickel status.
- Taxon
- riceOryza sativat0
- Outcome
- activities of arginase and glutamine synthetasee0
- Direction
- neithere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“neither were the activities of arginase and glutamine synthetase”
t0“rice”
Claim · model-written summary
Urease activity was undetectable in leaves of low-nickel rice.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese0
- Outcome
- urease activitye0
- Direction
- not detectablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“urease activity was not detectable in leaves of low-Ni plants”
t0“rice”
Claim · model-written summary
Low nickel and arginase action led to urea accumulation under NH4NO3.
- Taxon
- riceOryza sativat0
- Treatment
- NH4NO3e0
- Outcome
- accumulation of ureae0
- Qualifier
- arginase actione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which in conjunction with arginase action, led to the accumulation of urea in plants grown with NH4NO3”
t0“rice”
Claim · model-written summary
Nickel treatment did not affect amino acid contents or mineral nutrient status other than nickel.
- Taxon
- riceOryza sativat0
- Treatment
- Ni treatmente0
- Outcome
- Amino acid contents and mineral nutrient statuse0
- Direction
- not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Amino acid contents and mineral nutrient status (except Ni) were not affected by the Ni treatment.”
t0“rice”
Claim · model-written summary
Nickel deprivation reduced growth in urea-grown rice.
- Taxon
- riceOryza sativat0
- Treatment
- Ni-deprivede0
- Outcome
- growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea-grown Ni-deprived plants showed reduced growth”
t0“rice”
Claim · model-written summary
Nickel deprivation led to substantial urea accumulation in urea-grown rice.
- Taxon
- riceOryza sativat0
- Outcome
- accumulated large amounts of ureae0
- Qualifier
- lack of urease activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea-grown Ni-deprived plants showed reduced growth and accumulated large amounts of urea owing to the lack of urease activity.”
t0“rice”
Claim · model-written summary
Urea-grown nickel-deprived rice had low amino acid contents.
- Taxon
- riceOryza sativat0
- Outcome
- amino acid contentse0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These plants were further characterized by low amino acid contents indicating impaired usage of the N supplied.”
t0“rice”
Claim · model-written summary
Urea-grown nickel-deprived rice had reduced arginine levels.
- Taxon
- riceOryza sativat0
- Outcome
- levels of the urea precursor argininee0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They also exhibited reduced levels of the urea precursor arginine”
t0“rice”
Claim · model-written summary
Nickel supplementation increased dry weight in urea-grown rice.
- Taxon
- riceOryza sativat0
- Treatment
- 0.5 mmol m−3 Nie0
- Outcome
- dry weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When urea-grown plants were supplied with 0.5 mmol m−3 Ni in the nutrient solution, the dry weight and the amino acid N contents were increased at the expense of the urea contents”
t0“rice”
Claim · model-written summary
Nickel supplementation increased amino acid nitrogen in urea-grown rice.
- Taxon
- riceOryza sativat0
- Treatment
- 0.5 mmol m−3 Nie0
- Outcome
- amino acid N contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When urea-grown plants were supplied with 0.5 mmol m−3 Ni in the nutrient solution, the dry weight and the amino acid N contents were increased at the expense of the urea contents”
t0“rice”
Claim · model-written summary
Nickel supplementation reduced urea contents in urea-grown rice.
- Taxon
- riceOryza sativat0
- Treatment
- 0.5 mmol m−3 Nie0
- Outcome
- urea contentse0
- Direction
- at the expense ofe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When urea-grown plants were supplied with 0.5 mmol m−3 Ni in the nutrient solution, the dry weight and the amino acid N contents were increased at the expense of the urea contents”
t0“rice”
Claim · model-written summary
A critical shoot nickel concentration for dry matter production under NH4NO3 could not be determined.
- Taxon
- riceOryza sativat0
- Outcome
- critical Ni concentration in the shoot regarding dry matter productione0
- Qualifier
- NH4NO3-grown plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A critical Ni concentration in the shoot regarding dry matter production of NH4NO3-grown plants could not be deduced”
t0“rice”
Claim · model-written summary
A shoot nickel concentration of 25 μg Ni kg−1 DW was inadequate for urea-grown rice.
- Taxon
- riceOryza sativat0
- Outcome
- Nie0
- Value
- 25 μg Ni kg−1 DWe0
- Qualifier
- urea-grown plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“25 μg Ni kg−1 DW is certainly inadequate for urea-grown plants”
t0“rice”
The same questions in other papers
nickel atom · nutrient: content · Oryza sativa (rice)Results differ
1 paper in the same direction as this paper · 6 in the opposite direction
- negative
- negative
- no effect
4 papers more in this group
See all 8 papers →nickel atom · growth · Oryza sativa (rice)Results differ
5 papers in the same direction as this paper · 12 in the opposite direction
- negative
- negative
- negative
14 papers more in this group
See all 18 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.