Abstract
Phosphorus (P)-zinc (Zn) interactions were investigated in two wheat cultivars (Brookton versus Krichauff) differing in P uptake efficiency. The experiment was done in a growth chamber. Rock phosphate (RP) or CaHPO4 (CaP) were used as P sources, and ammonium nitrate (AN) or nitrate only (NO) were used as nitrogen sources. Two Zn levels were used, 0.22 mg x kg(-1) (LZ) and 2.2 mg ZnSO4.7H2O x kg(-1) (HZ), respectively. P availability significantly affected plant biomass production, but Zn supply had little effect. Plants fed ammonium nitrate had significantly lower concentrations of cations than those fed nitrate only. Cultivar Brookton (with higher P uptake efficiency) consistently had lower concentrations of cations than cv. Krichauff (with low P uptake efficiency) under limited P supply. The differences in concentrations of cations increased with the decrease in P availability, but were not affected by Zn supply. The ratio of potassium in roots to shoots of cultivar Brookton was always higher than in cultivar Krichauff. Based on these findings, it is postulated that the lower concentrations of cations in cultivar Brookton are related to root exudation of organic anions, and a conceptual model is established to describe the regulation of root exudation of organic anions and concentrations of cations.
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Claims 8
Claim · model-written summary
Phosphorus availability significantly affected wheat biomass.
- Taxon
- spring wheat
Triticum aestivumt0 - Treatment
- P availabilitye0
- Outcome
- plant biomass productione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P availability significantly affected plant biomass production”
t0“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
Zinc supply had little effect on wheat biomass.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Zn supplye0
- Outcome
- plant biomass productione1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn supply had little effect”
t0“spring wheat (Triticum aestivum L.)”
e1“P availability significantly affected plant biomass production”
Claim · model-written summary
Ammonium nitrate yielded lower cation concentrations than nitrate only.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- ammonium nitratee0
- Outcome
- concentrations of cationse0
- Direction
- lowere0
- Comparator
- nitrate onlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants fed ammonium nitrate had significantly lower concentrations of cations than those fed nitrate only”
t0“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
Brookton had lower cation concentrations than Krichauff under limited phosphorus.
- Taxon
- spring wheatTriticum aestivumt0
- Material
- Brooktone0
- Outcome
- concentrations of cationse0
- Direction
- lowere0
- Qualifier
- under limited P supplye0
- Comparator
- Krichauffe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivar Brookton (with higher P uptake efficiency) consistently had lower concentrations of cations than cv. Krichauff (with low P uptake efficiency) under limited P supply”
t0“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
Cultivar differences in cation concentrations increased as phosphorus availability decreased.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- P availabilitye0
- Outcome
- differences in concentrations of cationse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The differences in concentrations of cations increased with the decrease in P availability”
t0“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
Zinc supply did not affect differences in cultivar cation concentrations.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Zn supplye0
- Outcome
- differences in concentrations of cationse0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The differences in concentrations of cations increased with the decrease in P availability, but were not affected by Zn supply”
t0“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
Brookton had a higher root-to-shoot potassium ratio than Krichauff.
- Taxon
- spring wheatTriticum aestivumt0
- Material
- Brooktone0
- Outcome
- ratio of potassium in roots to shootse0
- Direction
- highere0
- Comparator
- Krichauffe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratio of potassium in roots to shoots of cultivar Brookton was always higher than in cultivar Krichauff”
t0“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
The authors postulate that root organic-anion exudation explains Brookton’s lower cations.
- Taxon
- spring wheatTriticum aestivumt0
- Material
- Brooktone0
- Outcome
- lower concentrations of cationse0
- Qualifier
- root exudation of organic anionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lower concentrations of cations in cultivar Brookton are related to root exudation of organic anions”
t0“spring wheat (Triticum aestivum L.)”
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See all 511 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.