Abstract
Phosphorus (P) and zinc (Zn) interact both in plants and soils and hence may affect the availability and utilization of each other. To investigate P and Zn nutritional status and P–Zn interactions, two genetically diverse Brassica cultivars classified as P tolerant (Brown Raya) and P sensitive (Sultan Raya) were grown in a sand-based pot culture. Jordan rock phosphate (RP) and monocalcium phosphate [Ca(H2PO4)2] were used as P sources, and ammonium nitrate (NH4NO3) or nitrate (NO3 --) only were used as nitrogen (N) sources. Two Zn levels [0.25 (low Zn) and 2.5 (high Zn) mg zinc sulfate (ZnSO4·5H2O) kg−1 sand, respectively] were applied along with recommended doses of other essential nutrients in the culture media. Cultivars differed significantly for their response to added P for biomass accumulation, but Zn supply had little effect. Cultivar Brown Raya had greater P uptake and P-utilization efficiency (PUE) than Sultan Raya under a P-stress environment, irrespective of Zn and N supply. Zinc supply had little effect on tissue P concentration and P uptake per unit of root dry matter (RDM) in either cultivar, irrespective of N supply. An increase in P supply caused a significant reduction in specific Zn uptake (Zn uptake per unit of RDM; SZnU) and tissue Zn concentration of both cultivars. The reduction in tissue Zn concentration cannot be ascribed entirely to a dilution effect. Zinc concentrations and uptake by P-efficient cultivar Brown Raya were significantly lower and more sensitive to P uptake than those of P-sensitive Sultan Raya cultivar. It is suggested that high PUE may depress plant Zn uptake and therefore cause a reduction in Zn concentration of Brassica grown in low-P and possibly low-Zn soils. In NH4NO3 nutrition, plants had significantly lower cation concentrations compared to NO3 -- nutrition only. Brown Raya consistently had lower cation concentrations than Sultan Raya under P stress. The differences in cation concentrations decreased with increased P availability, but Zn supply had no significant effect. In Brown Raya, the ratio of potassium in roots to shoots was always greater than in Sultan Raya. This suggested that lower cation concentrations in Brown Raya were due to root carboxylate exudations, which in turn were related to better P acquisition and PUE under insufficiently buffered P-stress environment.
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Claims 20
Claim · model-written summary
The cultivars differed significantly in biomass response to added phosphorus.
Not reportedComparatorDirection
Verbatim
e0“Cultivars differed significantly for their response to added P for biomass accumulation”
Claim · model-written summary
Zinc supply had little effect on biomass accumulation.
BrassicaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivars differed significantly for their response to added P for biomass accumulation, but Zn supply had little effect”
t0“BrassicaCultivars”
Claim · model-written summary
Brown Raya had greater phosphorus uptake than Sultan Raya under phosphorus stress regardless of zinc and nitrogen supply.
Verbatim
e0“Brown Raya had greater P uptake and P-utilization efficiency (PUE) than Sultan Raya under a P-stress environment, irrespective of Zn and N supply”
Claim · model-written summary
Brown Raya had greater phosphorus-use efficiency than Sultan Raya under phosphorus stress regardless of zinc and nitrogen supply.
Verbatim
e0“Brown Raya had greater P uptake and P-utilization efficiency (PUE) than Sultan Raya under a P-stress environment, irrespective of Zn and N supply”
Claim · model-written summary
Zinc supply had little effect on tissue phosphorus concentration in either cultivar.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zinc supply had little effect on tissue P concentration and P uptake per unit of root dry matter (RDM) in either cultivar, irrespective of N supply”
t0“BrassicaCultivars”
Claim · model-written summary
Zinc supply had little effect on phosphorus uptake per unit root dry matter in either cultivar.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zinc supply had little effect on tissue P concentration and P uptake per unit of root dry matter (RDM) in either cultivar, irrespective of N supply”
t0“BrassicaCultivars”
Claim · model-written summary
Increased phosphorus supply significantly reduced specific zinc uptake in both cultivars.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in P supply caused a significant reduction in specific Zn uptake (Zn uptake per unit of RDM; SZnU) and tissue Zn concentration of both cultivars”
t0“BrassicaCultivars”
Claim · model-written summary
Increased phosphorus supply significantly reduced tissue zinc concentration in both cultivars.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in P supply caused a significant reduction in specific Zn uptake (Zn uptake per unit of RDM; SZnU) and tissue Zn concentration of both cultivars”
t0“BrassicaCultivars”
Claim · model-written summary
Reduced tissue zinc concentration could not be explained entirely by dilution.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in tissue Zn concentration cannot be ascribed entirely to a dilution effect”
t0“BrassicaCultivars”
Claim · model-written summary
Brown Raya had significantly lower zinc concentration than Sultan Raya.
Verbatim
e0“Zinc concentrations and uptake by P-efficient cultivar Brown Raya were significantly lower and more sensitive to P uptake than those of P-sensitive Sultan Raya cultivar”
Claim · model-written summary
Brown Raya had significantly lower zinc uptake than Sultan Raya.
Verbatim
e0“Zinc concentrations and uptake by P-efficient cultivar Brown Raya were significantly lower and more sensitive to P uptake than those of P-sensitive Sultan Raya cultivar”
Claim · model-written summary
Zinc concentrations and uptake in Brown Raya were more sensitive to phosphorus uptake than in Sultan Raya.
Verbatim
e0“Zinc concentrations and uptake by P-efficient cultivar Brown Raya were significantly lower and more sensitive to P uptake than those of P-sensitive Sultan Raya cultivar”
Claim · model-written summary
High phosphorus-use efficiency may depress plant zinc uptake.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high PUE may depress plant Zn uptake”
t0“BrassicaCultivars”
Claim · model-written summary
NH4NO3 nutrition yielded significantly lower cation concentrations than NO3 -- nutrition alone.
- Treatment
- NH4NO3 nutritione0
- Outcome
- cation concentrationse0
- Direction
- lowere0
- Comparator
- NO3 -- nutrition onlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In NH4NO3 nutrition, plants had significantly lower cation concentrations compared to NO3 -- nutrition only”
t0“BrassicaCultivars”
Claim · model-written summary
Brown Raya had lower cation concentrations than Sultan Raya under phosphorus stress.
Verbatim
e0“Brown Raya consistently had lower cation concentrations than Sultan Raya under P stress”
Claim · model-written summary
Cultivar differences in cation concentration decreased as phosphorus availability increased.
- Treatment
- increased P availabilitye0
- Outcome
- differences in cation concentrationse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The differences in cation concentrations decreased with increased P availability”
t0“BrassicaCultivars”
Claim · model-written summary
Zinc supply had no significant effect on cation concentrations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The differences in cation concentrations decreased with increased P availability, but Zn supply had no significant effect”
t0“BrassicaCultivars”
Claim · model-written summary
Brown Raya had a greater root-to-shoot potassium ratio than Sultan Raya.
Verbatim
e0“In Brown Raya, the ratio of potassium in roots to shoots was always greater than in Sultan Raya”
Claim · model-written summary
The authors attributed lower cation concentration in Brown Raya to root carboxylate exudation.
Verbatim
e0“lower cation concentrations in Brown Raya were due to root carboxylate exudations”
Claim · model-written summary
Root carboxylate exudation was associated with better phosphorus acquisition and use efficiency in Brown Raya.
Verbatim
e0“root carboxylate exudations, which in turn were related to better P acquisition and PUE under insufficiently buffered P-stress environment”
e1“In Brown Raya”
The same questions in other papers
zinc atom · nutrient: content · BrassicaPositive and negative results
1 in the opposite direction
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1 paper in the same direction as this paper
- negative
phosphorus · nutrient: content · BrassicaPositive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 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.