Abstract
Nickel (Ni) - a component of urease and hydrogenase - was the latest nutrient to be included in the list of essential elements to plants. Although relevant studies have been performed concerning its essentiality, there are no records of Ni deficiency for annual species cultivated under field conditions. The reason might be the nonappearance of obvious symptoms, i.e., a hidden (or latent) deficiency. Soybean, a crop cultivated on soils poor in available Ni content, has a high dependence on biological nitrogen fixation, in which Ni plays a key role. Thus, we hypothesized that Ni fertilization in soybean genotypes results in a better physiological status and in higher grain production due to the hidden deficiency of this micronutrient. To verify this hypothesis, two simultaneous experiments were carried out, under greenhouse and field conditions, with fertilization of 0.0 or 0.5 mg of Ni kg-1 of soil. For this, we have used 15 soybean genotypes and two soybean isogenic lines (urease positive, Eu3; urease activity-null, eu3-a, formerly eu3-e1). Plants were evaluated for yield, Ni concentration, N concentration, photosynthesis, and N metabolism. Nickel fertilization resulted in greater grain yield in some genotypes, evidencing the hidden deficiency of Ni in both conditions, i.e., greenhouse and field. Increasing yields were associated with a high efficiency of N metabolism, namely, a higher leaf concentration of ureides and ammonia. Nitrogen compounds allowed also separation of the genotypes into different ‘responsiveness groups’ to Ni supply. Ni fertilization also promoted leaf N concentration and positively affected the photosynthesis in the genotypes, never causing detrimental effects, except for the eu3-a mutant. Due to the absence of ureolytic activity, eu3-a had a high leaf urea accumulation, coinciding with lower yield. In summary, the effect of Ni on the plants was positive and the extent of this effect was controlled by genotype-environment interaction. The application of 0.5 mg kg-1 of Ni resulted in safe levels of this element in grains for human health consumption. Including Ni applications in fertilization programs may provide significant yield benefits in soybean production. This might also be the case for other annual crops, especially legumes.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 8
Claim · model-written summary
Nickel fertilization increased grain yield in some soybean genotypes in greenhouse and field conditions.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Nickel fertilizatione0
- Outcome
- grain yielde0
- Direction
- greatere0
- Qualifier
- some genotypese0
- Setting
- greenhouse and fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nickel fertilization resulted in greater grain yield in some genotypes, evidencing the hidden deficiency of Ni in both conditions, i.e., greenhouse and field.”
t0“Soybean Genotypes”
Claim · model-written summary
Increasing soybean yields were associated with higher leaf ureide and ammonia concentrations.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- leafe0
- Compound
- ureides and ammoniae0
- Outcome
- yieldse0
- Direction
- Increasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing yields were associated with a high efficiency of N metabolism, namely, a higher leaf concentration of ureides and ammonia.”
t0“Soybean Genotypes”
Claim · model-written summary
Nitrogen compounds separated soybean genotypes into responsiveness groups to nickel supply.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Ni supplye0
- Outcome
- separation of the genotypes into different ‘responsiveness groups’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen compounds allowed also separation of the genotypes into different ‘responsiveness groups’ to Ni supply.”
t0“Soybean Genotypes”
Claim · model-written summary
Nickel fertilization increased leaf nitrogen concentration in soybean genotypes.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Ni fertilizatione0
- Outcome
- leaf N concentratione0
- Direction
- promotede0
- Qualifier
- except for the eu3-a mutante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni fertilization also promoted leaf N concentration and positively affected the photosynthesis in the genotypes, never causing detrimental effects, except for the eu3-a mutant.”
t0“Soybean Genotypes”
Claim · model-written summary
Nickel fertilization positively affected photosynthesis in soybean genotypes except the eu3-a mutant.
- Taxon
- SoybeanGlycine maxt0
- Material
- eu3-a mutante0
- Treatment
- Ni fertilizatione0
- Outcome
- photosynthesise0
- Direction
- positively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ni fertilization also promoted leaf N concentration and positively affected the photosynthesis in the genotypes, never causing detrimental effects, except for the eu3-a mutant.”
t0“Soybean Genotypes”
Claim · model-written summary
The eu3-a soybean mutant accumulated high leaf urea and had lower yield.
- Taxon
- SoybeanGlycine maxt0
- Material
- eu3-ae0
- Compound
- ureae0
- Outcome
- yielde0
- Direction
- lowere0
- Qualifier
- absence of ureolytic activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Due to the absence of ureolytic activity, eu3-a had a high leaf urea accumulation, coinciding with lower yield.”
t0“Soybean Genotypes”
Claim · model-written summary
Soybean grain nickel levels after 0.5 mg kg-1 nickel application were safe for human consumption.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- 0.5 mg kg-1 of Nie0
- Outcome
- safe levels of this element in grainse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 0.5 mg kg-1 of Ni resulted in safe levels of this element in grains for human health consumption.”
t0“Soybean Genotypes”
Claim · model-written summary
The authors suggest including nickel in soybean fertilization programs for yield benefits.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- Including Ni applications in fertilization programse0
- Qualifier
- may provide significant yield benefitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Including Ni applications in fertilization programs may provide significant yield benefits in soybean production.”
t0“Soybean Genotypes”
The same questions in other papers
nickel atom · yield · Glycine max (soybean)Results differ
6 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- positive
- positive
9 papers more in this group
See all 13 papers →nickel atom · nutrient: content · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →fertilization · nutrient: content · Glycine max (soybean)Positive and negative results
264 papers in the same direction as this paper · 44 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- no effect
306 papers more in this group
See all 310 papers →fertilization · yield · Glycine max (soybean)Positive and negative results
1,020 papers in the same direction as this paper · 155 in the opposite direction · 16 reporting no difference from an alternative
- no effect
- no effect
- negative
1,188 papers more in this group
See all 1,192 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.