Abstract
This paper presents an investigation of the effects of trivalent chromium on biomass growth (RGR), water use efficiency (WUE) and distribution of nutrient elements in young rice seedlings (Oryza sativa L. cv. XZX 45) exposed to chromium nitrate (Cr(III)) hydroponically. Results indicated that phytotoxicity of Cr(III) to rice seedlings was apparent, showing an linear decrease in both RGR and WUE with increasing Cr(III) concentrations. Using the Leven-berg-Marquardt Algorithm, the effective concentrations (EC) obtained from the RGR were always smaller than these from WUE, indicating that the former was more sensitive to change of Cr(III) application than the latter. Although a dose-dependent total accumulation rate of Cr in plant materials was observed, the translocation of Cr into shoots was a restricted process during phytotransport of Cr within plant materials. Results also showed that the effect of Cr(III) application on uptake and distribution of nutrient elements in rice seedlings was variable. In conclusion, the toxic response of young rice seedlings to Cr(III) was obvious and inhibitory effects were highly dependent on the total accumulation rate of Cr in plant materials.
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Claims 7
Claim · model-written summary
Relative growth rate decreased linearly with increasing chromium.
- Taxon
- rice seedlings
Oryza sativat0 - Treatment
- Cr(III) concentrationse0
- Outcome
- RGRe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showing an linear decrease in both RGR and WUE with increasing Cr(III) concentrations”
t0“rice seedlings”
Claim · model-written summary
Water use efficiency decreased linearly with increasing chromium.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- Cr(III) concentrationse0
- Outcome
- WUEe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showing an linear decrease in both RGR and WUE with increasing Cr(III) concentrations”
t0“rice seedlings”
Claim · model-written summary
Growth-rate effective concentrations were smaller than water-use effective concentrations.
- Taxon
- rice seedlingsOryza sativat0
- Outcome
- effective concentrations (EC)e0
- Direction
- smallere0
- Comparator
- WUEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effective concentrations (EC) obtained from the RGR were always smaller than these from WUE”
t0“rice seedlings”
Claim · model-written summary
Total chromium accumulation increased with dose.
- Taxon
- rice seedlingsOryza sativat0
- Treatment
- Cre0
- Outcome
- total accumulation rate of Cr in plant materialse0
- Direction
- dose-dependente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a dose-dependent total accumulation rate of Cr in plant materials was observed”
t0“rice seedlings”
Claim · model-written summary
Chromium translocation to shoots was restricted.
- Taxon
- rice seedlingsOryza sativat0
- Organ / stage
- shootse0
- Outcome
- translocation of Cr into shootse0
- Direction
- restrictede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the translocation of Cr into shoots was a restricted process”
t0“rice seedlings”
Claim · model-written summary
Chromium effects on nutrient uptake and distribution were variable.
- Taxon
- rice seedlingsOryza sativae0
- Treatment
- Cr(III) applicatione0
- Outcome
- uptake and distribution of nutrient elementse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of Cr(III) application on uptake and distribution of nutrient elements in rice seedlings was variable”
Claim · model-written summary
Inhibition depended strongly on total chromium accumulation.
- Taxon
- rice seedlingsOryza sativat0
- Compound
- Cre0
- Outcome
- inhibitory effectse0
- Qualifier
- total accumulation rate of Cr in plant materialse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibitory effects were highly dependent on the total accumulation rate of Cr in plant materials”
t0“rice seedlings”
The same questions in other papers
chromium atom · growth · Oryza sativa (rice)Positive and negative results
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- positive
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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.