Abstract
We studied effects of free copper ion activity and total copper concentration on copper uptake by lettuce from nutrient solution and a model was developed. In ethylenediaminetetraacetic acid and dissolved organic matter treatments, when pH and free copper ion activity were the same, root copper concentration did not change with the total copper concentration. However, at fixed pH and total copper concentration, root copper concentration increased with, and was log-log linearly related to free copper ion activity. Copper uptake by plant roots is affected by free copper ion activity, pH, and the concentration of other competing ions such as Ca2+. Based on the free-ion activity model, we developed a model to predict copper concentrations in lettuce root and shoot. The parameters in this model are the binding constant of lettuce root surface site for copper times the site density, log(nK(Cu)) = 11.29 +/- 0.10; for protons, log(K(H)) = 6.80 +/- 0.12; and for calcium, log(K(Ca)) = 8.49 +/- 0.30. Copper concentration in lettuce shoot was much lower than that of lettuce root. The translocation coefficient (k) is (2.36 +/- 0.37) x 10(-2).
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Claims 8
Claim · model-written summary
When pH and free copper ion activity were the same, root copper concentration did not change with total copper concentration in EDTA and DOM treatments.
- Taxon
- Lactuca sativa
Lactuca sativat0 - Treatment
- ethylenediaminetetraacetic acid and dissolved organic mattere0
- Outcome
- root copper concentratione0
- Direction
- did not changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LETTUCE (LACTUCA SATIVA ROMANCE)”
e0“In ethylenediaminetetraacetic acid and dissolved organic matter treatments, when pH and free copper ion activity were the same, root copper concentration did not change with the total copper concentration”
Claim · model-written summary
At fixed pH and total copper concentration, root copper concentration increased with free copper ion activity.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- free copper ion activitye1
- Outcome
- root copper concentratione1
- Direction
- increasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LETTUCE (LACTUCA SATIVA ROMANCE)”
e1“However, at fixed pH and total copper concentration, root copper concentration increased with, and was log-log linearly related to free copper ion activity”
Claim · model-written summary
Copper uptake by lettuce roots is affected by free copper ion activity, pH and competing ions such as Ca2+.
- Taxon
- Lactuca sativaLactuca sativat0
- Treatment
- free copper ion activity, pH, and the concentration of other competing ions such as Ca2+e2
- Outcome
- Copper uptakee2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LETTUCE (LACTUCA SATIVA ROMANCE)”
e2“Copper uptake by plant roots is affected by free copper ion activity, pH, and the concentration of other competing ions such as Ca2+”
Claim · model-written summary
The binding constant of the lettuce root surface site for copper times site density is log(nK(Cu)) = 11.29 +/- 0.10.
- Taxon
- Lactuca sativaLactuca sativat0
- Outcome
- binding constant of lettuce root surface site for copper times the site densitye3
- Value
- 11.29 +/- 0.10e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LETTUCE (LACTUCA SATIVA ROMANCE)”
e3“The parameters in this model are the binding constant of lettuce root surface site for copper times the site density, log(nK(Cu)) = 11.29 +/- 0.10”
Claim · model-written summary
The model binding constant for protons is log(K(H)) = 6.80 +/- 0.12.
- Taxon
- Lactuca sativaLactuca sativat0
- Outcome
- log(K(H))e4
- Value
- 6.80 +/- 0.12e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LETTUCE (LACTUCA SATIVA ROMANCE)”
e4“for protons, log(K(H)) = 6.80 +/- 0.12”
Claim · model-written summary
The model binding constant for calcium is log(K(Ca)) = 8.49 +/- 0.30.
- Taxon
- Lactuca sativaLactuca sativat0
- Outcome
- log(K(Ca))e5
- Value
- 8.49 +/- 0.30e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LETTUCE (LACTUCA SATIVA ROMANCE)”
e5“and for calcium, log(K(Ca)) = 8.49 +/- 0.30”
Claim · model-written summary
The translocation coefficient from root to shoot is (2.36 +/- 0.37) x 10(-2).
- Taxon
- Lactuca sativaLactuca sativat0
- Outcome
- translocation coefficient (k)e6
- Value
- (2.36 +/- 0.37) x 10(-2)e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LETTUCE (LACTUCA SATIVA ROMANCE)”
e6“The translocation coefficient (k) is (2.36 +/- 0.37) x 10(-2)”
Claim · model-written summary
Copper concentration in lettuce shoot was much lower than in lettuce root.
- Taxon
- Lactuca sativaLactuca sativat0
- Organ / stage
- shoote7
- Outcome
- Copper concentration in lettuce shoote7
- Direction
- much lowere7
- Comparator
- lettuce roote7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“LETTUCE (LACTUCA SATIVA ROMANCE)”
e7“Copper concentration in lettuce shoot was much lower than that of lettuce root”
The same questions in other papers
organic · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
6 papers in the same direction as this paper · 14 in the opposite direction
- positive
- positive
- positive
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See all 21 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.