Abstract
The base excision repair (BER) pathway is an essential defense mechanism against oxidative damage of DNA in plants. Previous studies have reported that chromium (Cr) exposure causes oxidative stress and DNA damage due to accumulation of ROS. In this study, hydroponic experiments were carried out to investigate mRNA expression of 21 candidate genes involved in the BER pathway in rice seedlings exposed to Cr(III) using qRT-PCR. Changes of H2O2 and O2-• content in rice tissues and the relative growth rate (%) of rice seedlings were also determined. The results indicated that Cr(III) induced dose-dependent inhibition on the relative growth rate of rice seedlings. H2O2 content in roots were significantly increased. Changes of the content of H2O2 and O2-• in shoots was consistent. PCR analysis revealed that responses of selected 21 candidate genes to Cr(III) exposure were tissue specific. The BER pathway in roots was repressed by Cr(III) treatment but activated in shoots in response to Cr(III) exposure, suggesting that the BER pathway would play different roles in regulating and repairing DNA damage caused by Cr(III) exposure in rice.
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Claims 6
Claim · model-written summary
Cr(III) dose-dependently inhibited rice seedling relative growth rate.
- Taxon
- rice
Oryza sativae0 - Treatment
- Cr(III)e0
- Outcome
- relative growth ratee0
- Direction
- inhibitione0
- Qualifier
- dose-dependente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cr(III) induced dose-dependent inhibition on the relative growth rate of rice seedlings.”
Claim · model-written summary
Root H2O2 content increased significantly under Cr(III) exposure.
- Taxon
- riceOryza sativae1
- Organ / stage
- rootse0
- Treatment
- Cr(III)e1
- Outcome
- H2O2 contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O2 content in roots were significantly increased.”
e1“rice seedlings exposed to Cr(III)”
Claim · model-written summary
Shoot H2O2 and O2-• content changed consistently.
- Taxon
- riceOryza sativae1
- Organ / stage
- shootse0
- Treatment
- Cr(III)e1
- Outcome
- content of H2O2 and O2-•e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes of the content of H2O2 and O2-• in shoots was consistent.”
e1“rice seedlings exposed to Cr(III)”
Claim · model-written summary
The 21 candidate genes showed tissue-specific responses to Cr(III).
- Taxon
- riceOryza sativae1
- Treatment
- Cr(III) exposuree0
- Gene
- 21 candidate genese0
- Outcome
- responses of selected 21 candidate genese0
- Qualifier
- tissue specifice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“responses of selected 21 candidate genes to Cr(III) exposure were tissue specific.”
e1“rice seedlings exposed to Cr(III)”
Claim · model-written summary
Cr(III) repressed the BER pathway in roots.
- Taxon
- riceOryza sativae1
- Organ / stage
- rootse0
- Treatment
- Cr(III) treatmente0
- Outcome
- BER pathwaye0
- Direction
- repressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The BER pathway in roots was repressed by Cr(III) treatment”
e1“rice seedlings exposed to Cr(III)”
Claim · model-written summary
Cr(III) activated the BER pathway in shoots.
Not reportedTaxonComparator
Verbatim
e0“activated in shoots in response to Cr(III) exposure”
e1“The BER pathway in roots was repressed by Cr(III) treatment but activated in shoots in response to Cr(III) exposure,”
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