Abstract
Chemical forms of chromium (Cr) in rice seedlings ( Oryza sativa L. cv. BX139) exposed to either potassium chromate Cr(VI) or chromium nitrate Cr(III) were clarified using a hydroponic study. Seven chemical fractions of Cr in different rice tissues were extracted using a sequential extraction method. Results indicated that exposures to both Cr valents resulted in significant accumulation of Cr in rice tissues and Cr(III) was more bioavailable for rice seedlings than Cr(VI). However, Cr chemical forms were inconsistent in both plant materials (root/shoots) as well as in two different Cr variants. Although both Cr variants caused dose-dependent inhibition on relative growth rates of rice seedlings, different inhibition mechanisms most likely exited using a partial correlation analysis. Both fractions of Cr in cell wall and in intracellular location in roots significantly inhibited the relative growth rates of rice seedlings exposed to Cr(VI), while inhibition of the relative growth rate of rice seedlings exposed to Cr(III) was largely stemmed from Cr partition in intracellular fraction in shoots.
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Claims 8
Claim · model-written summary
Exposure to Cr(VI) significantly accumulated chromium in rice tissue.
- Taxon
- rice
Oryza sativae0 - Treatment
- Cr valentse0
- Outcome
- accumulation of Cre0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exposures to both Cr valents resulted in significant accumulation of Cr in rice tissues”
Claim · model-written summary
Cr(III) was more bioavailable to rice seedlings than Cr(VI).
- Taxon
- rice seedlingsOryza sativae0
- Treatment
- Cr(III)e0
- Outcome
- bioavailablee0
- Direction
- moree0
- Comparator
- Cr(VI)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cr(III) was more bioavailable for rice seedlings than Cr(VI)”
Claim · model-written summary
Chromium chemical forms differed between rice roots and shoots and between Cr variants.
- Taxon
- riceOryza sativat0
- Organ / stage
- root/shootse0
- Outcome
- Cr chemical formse0
- Qualifier
- two different Cr variantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cr chemical forms were inconsistent in both plant materials (root/shoots) as well as in two different Cr variants”
t0“rice plants”
Claim · model-written summary
Cr(VI) caused dose dependent inhibition of rice seedling relative growth rates.
- Taxon
- rice seedlingsOryza sativae0
- Treatment
- Cr variantse0
- Outcome
- relative growth ratese0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both Cr variants caused dose-dependent inhibition on relative growth rates of rice seedlings”
Claim · model-written summary
Cr(III) caused dose dependent inhibition of rice seedling relative growth rates.
- Taxon
- rice seedlingsOryza sativae0
- Treatment
- Cr variantse0
- Outcome
- relative growth ratese0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both Cr variants caused dose-dependent inhibition on relative growth rates of rice seedlings”
Claim · model-written summary
Root cell wall chromium significantly inhibited relative growth under Cr(VI).
- Taxon
- rice seedlingsOryza sativae0
- Organ / stage
- cell walle0
- Treatment
- Cr(VI)e0
- Outcome
- relative growth ratese0
- Direction
- inhibitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both fractions of Cr in cell wall and in intracellular location in roots significantly inhibited the relative growth rates of rice seedlings exposed to Cr(VI)”
Claim · model-written summary
Intracellular root chromium significantly inhibited relative growth under Cr(VI).
- Taxon
- rice seedlingsOryza sativae0
- Organ / stage
- intracellular location in rootse0
- Treatment
- Cr(VI)e0
- Outcome
- relative growth ratese0
- Direction
- inhibitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both fractions of Cr in cell wall and in intracellular location in roots significantly inhibited the relative growth rates of rice seedlings exposed to Cr(VI)”
Claim · model-written summary
Shoot intracellular chromium largely accounted for growth inhibition under Cr(III).
- Taxon
- rice seedlingsOryza sativae0
- Organ / stage
- intracellular fraction in shootse0
- Treatment
- Cr(III)e0
- Outcome
- inhibition of the relative growth ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition of the relative growth rate of rice seedlings exposed to Cr(III) was largely stemmed from Cr partition in intracellular fraction in shoots”
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See all 13 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.