Abstract
Abstract The effect of dimethylarsenic acid (DMAA) applied to the root on arsenic (As) uptake and concentration, net photosynthesis (Pn), and growth parameters of rice (Oryza sativa L. cv. ‘Mercury') plants was studied. The experiment consisted of four treatments (0, 0.2, 0.8, and 1.6 mg As/L) with four replications in a completely randomized design. The DMAA was applied in nutrient solution as its sodium salt. The solution culture was changed every four days to avoid changes in the As chemical form. Arsenic uptake and concentration in shoot and root increased upon increased DMAA concentration in solution. Upon uptake, DMAA was readily translocated to the shoot. At the two higher rates of DMAA application (0.8 and 1.6 mg As/L), Pn and photosynthetic capacity were significantly decreased in response to tissue As concentration. Leaf area and dry matter production were also significantly reduced at the two higher rates of DMAA. At the lower rate (0.2 mg As/L) of DMAA application, there was no significant reduction in Pn or growth. Dimethylarsenic acid application did not affect nutrient allocation within the rice plant at concentration levels used in this study.
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Claims 6
Claim · model-written summary
Arsenic uptake and concentration in rice shoots and roots rose with DMAA concentration in solution.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- shoot and roote0
- Treatment
- increased DMAA concentration in solutione0
- Outcome
- Arsenic uptake and concentration in shoot and roote0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arsenic uptake and concentration in shoot and root increased upon increased DMAA concentration in solution.”
t0“rice plants”
Claim · model-written summary
Absorbed DMAA was readily translocated to rice shoots.
- Taxon
- riceOryza sativat0
- Organ / stage
- shoote0
- Outcome
- DMAA was readily translocated to the shoote0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Upon uptake, DMAA was readily translocated to the shoot.”
t0“rice plants”
Claim · model-written summary
Higher DMAA rates significantly reduced rice net photosynthesis and photosynthetic capacity.
- Taxon
- riceOryza sativat0
- Treatment
- DMAA application (0.8 and 1.6 mg As/L)e0
- Compound
- tissue As concentratione0
- Outcome
- Pn and photosynthetic capacitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the two higher rates of DMAA application (0.8 and 1.6 mg As/L), Pn and photosynthetic capacity were significantly decreased in response to tissue As concentration.”
t0“rice plants”
Claim · model-written summary
Higher DMAA rates significantly reduced rice leaf area and dry matter production.
- Taxon
- riceOryza sativat0
- Treatment
- DMAA application (0.8 and 1.6 mg As/L)e1
- Outcome
- Leaf area and dry matter productione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area and dry matter production were also significantly reduced at the two higher rates of DMAA.”
e1“At the two higher rates of DMAA application (0.8 and 1.6 mg As/L)”
t0“rice plants”
Claim · model-written summary
The lower DMAA rate did not significantly reduce rice net photosynthesis or growth.
- Taxon
- riceOryza sativat0
- Treatment
- DMAA applicatione0
- Outcome
- Pn or growthe0
- Direction
- no significant reductione0
- Qualifier
- 0.2 mg As/Le0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the lower rate (0.2 mg As/L) of DMAA application, there was no significant reduction in Pn or growth.”
t0“rice plants”
Claim · model-written summary
DMAA application did not affect rice nutrient allocation at the concentrations used.
- Taxon
- riceOryza sativae0
- Treatment
- Dimethylarsenic acid applicatione0
- Outcome
- nutrient allocatione0
- Direction
- did not affecte0
- Qualifier
- at concentration levels used in this studye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dimethylarsenic acid application did not affect nutrient allocation within the rice plant at concentration levels used in this study.”
The same questions in other papers
arsenic atom · yield · Oryza sativa (rice)Results differ
11 papers in the same direction as this paper · 1 in the opposite direction
- negative
- negative
- negative
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See all 13 papers →arsenic atom · physiology: photosynthesis · Oryza sativa (rice)Results agree
5 papers in the same direction as this paper
- negative
- negative
- negative
2 papers more in this group
See all 6 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.