Abstract
Rice (Oryza sativa L.) plants were grown for 1 month in nutrient solutions containing Cu concentrations ranging from 0.002 to 6.25 mg/L and then subjected to kinetic studies of metal absorption and to biomass yield measurements. A biphasic kinetic pattern was found for Cu uptake rates, with a transition phase occurring at metal concentrations between 0.05 and 0.25 mg/L. From the apparent Vmax and Km values, it is proposed that Cu is absorbed by an active mechanism up to concentrations of 0.05 mg/L in the nutrient solution, with a passive absorption mechanism progressively taking over for increasing concentrations of the metal. The Cu uptake pattern is discussed in relation to biomass yields, which reach a maximum value in the 0.25 mg/L Cu treatment at the end of the 30-day experimental period. Data on translocation rates of Cu to the shoot are also presented.
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Claims 4
Claim · model-written summary
Copper uptake rates followed a biphasic kinetic pattern with transition at 0.05 to 0.25 mg/L.
- Taxon
- Rice (Oryza sativa L.)
Oryza sativae1 - Outcome
- biphasic kinetic patterne0
- Value
- 0.05 and 0.25 mg/Le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A biphasic kinetic pattern was found for Cu uptake rates, with a transition phase occurring at metal concentrations between 0.05 and 0.25 mg/L”
e1“Rice (Oryza sativa L.)”
Claim · model-written summary
The authors proposed active copper absorption up to 0.05 mg/L.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae1
- Outcome
- Cu is absorbede0
- Value
- 0.05 mg/Le0
- Qualifier
- active mechanisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cu is absorbed by an active mechanism up to concentrations of 0.05 mg/L in the nutrient solution”
e1“Rice (Oryza sativa L.)”
Claim · model-written summary
The authors proposed increasingly passive copper absorption at higher concentrations.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae1
- Outcome
- passive absorption mechanism progressively taking overe0
- Qualifier
- increasing concentrations of the metale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with a passive absorption mechanism progressively taking over for increasing concentrations of the metal”
e1“Rice (Oryza sativa L.)”
Claim · model-written summary
Rice biomass yield peaked under 0.25 mg/L copper after 30 days.
- Taxon
- Rice (Oryza sativa L.)Oryza sativae1
- Treatment
- 0.25 mg/L Cu treatmente0
- Outcome
- biomass yieldse0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“biomass yields, which reach a maximum value in the 0.25 mg/L Cu treatment at the end of the 30-day experimental period”
e1“Rice (Oryza sativa L.)”
The same questions in other papers
copper atom · yield · Oryza sativa (rice)Results differ
30 papers in the same direction as this paper · 11 in the opposite direction
- negative
- negative
- negative
38 papers more in this group
See all 42 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.