Abstract
The cadmium detoxification by rice(Oryza sativas L.) seedlings after the treatment with silicon and corresponding mechanisms were investigated by hydroponic culture method. The significant decrease in seedling biomass coupled with the occurrence of Cd-toxic symptoms on the rice was detected after the seedlings were exposed to 4 mg·L-1 Cd2+ solution for 4 d. However, Cd toxicity was alleviated significantly by the addition of 30~180 mg·L-1 silicon (SiO2) to cadmium solution, and the seedling biomass increased significantly. The addition of Si to Cd solution not only decreased the content of Cd in the plants and the Cd absorption by the plants, but also reduced the ratio of Cd in upper parts to that in roots, and the ratio of leaves to stems. Si increased the proportion of Cd in root cell walls but reduced the ratio of Cd in symplasts to that in apoplasts. Furthermore, the content of exchangeable Cd related to free form Cd in root cell free space (RCFS) increased after the treatment with Si, indicating that more Cd in RCFS became exchangeable after Si treatment. These results suggested that the improved Cd-resistance by Si would result from not only the inhibition of Cd absorption by the plants and Cd transport to the upper parts, but also the enhancement of Cd localization in cell walls and the exchangeable Cd in RCFS.
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Claims 10
Claim · model-written summary
Cadmium exposure significantly reduced rice seedling biomass and caused toxicity symptoms.
- Taxon
- rice
Oryza sativae0 - Treatment
- 4 mg·L-1 Cd2+ solutione0
- Outcome
- seedling biomasse0
- Direction
- decreasee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant decrease in seedling biomass coupled with the occurrence of Cd-toxic symptoms on the rice was detected after the seedlings were exposed to 4 mg·L-1 Cd2+ solution for 4 d”
Claim · model-written summary
Silicon addition significantly alleviated cadmium toxicity and increased seedling biomass.
- Taxon
- riceOryza sativae1
- Treatment
- addition of 30~180 mg·L-1 silicon (SiO2)e0
- Outcome
- Cd toxicitye0
- Direction
- alleviatede0
- Comparator
- cadmium solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd toxicity was alleviated significantly by the addition of 30~180 mg·L-1 silicon (SiO2) to cadmium solution, and the seedling biomass increased significantly”
e1“rice(Oryza sativas L.) seedlings”
Claim · model-written summary
Silicon increased rice seedling biomass under cadmium exposure.
- Taxon
- riceOryza sativae1
- Treatment
- addition of 30~180 mg·L-1 silicon (SiO2)e0
- Outcome
- seedling biomasse0
- Direction
- increasede0
- Comparator
- cadmium solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd toxicity was alleviated significantly by the addition of 30~180 mg·L-1 silicon (SiO2) to cadmium solution, and the seedling biomass increased significantly”
e1“rice(Oryza sativas L.) seedlings”
Claim · model-written summary
Silicon reduced cadmium content and absorption in rice seedlings.
- Taxon
- riceOryza sativae1
- Treatment
- addition of Si to Cd solutione0
- Outcome
- content of Cd in the plants and the Cd absorption by the plantse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of Si to Cd solution not only decreased the content of Cd in the plants and the Cd absorption by the plants”
e1“rice(Oryza sativas L.) seedlings”
Claim · model-written summary
Silicon reduced the cadmium ratio of upper parts to roots in rice.
- Taxon
- riceOryza sativae1
- Treatment
- addition of Si to Cd solutione0
- Outcome
- ratio of Cd in upper parts to that in rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of Si to Cd solution not only decreased the content of Cd in the plants and the Cd absorption by the plants, but also reduced the ratio of Cd in upper parts to that in roots, and the ratio of leaves to stems”
e1“rice(Oryza sativas L.) seedlings”
Claim · model-written summary
Silicon reduced the cadmium ratio of leaves to stems in rice.
- Taxon
- riceOryza sativae1
- Treatment
- addition of Si to Cd solutione0
- Outcome
- ratio of leaves to stemse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of Si to Cd solution not only decreased the content of Cd in the plants and the Cd absorption by the plants, but also reduced the ratio of Cd in upper parts to that in roots, and the ratio of leaves to stems”
e1“rice(Oryza sativas L.) seedlings”
Claim · model-written summary
Silicon increased the proportion of cadmium in rice root cell walls.
- Taxon
- riceOryza sativae1
- Treatment
- Sie0
- Outcome
- proportion of Cd in root cell wallse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si increased the proportion of Cd in root cell walls but reduced the ratio of Cd in symplasts to that in apoplasts”
e1“rice(Oryza sativas L.) seedlings”
Claim · model-written summary
Silicon reduced the ratio of cadmium in symplasts to apoplasts.
- Taxon
- riceOryza sativae1
- Treatment
- Sie0
- Outcome
- ratio of Cd in symplasts to that in apoplastse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si increased the proportion of Cd in root cell walls but reduced the ratio of Cd in symplasts to that in apoplasts”
e1“rice(Oryza sativas L.) seedlings”
Claim · model-written summary
Silicon increased exchangeable cadmium in rice root cell free space.
- Taxon
- riceOryza sativae1
- Treatment
- Sie0
- Outcome
- content of exchangeable Cd related to free form Cd in root cell free space (RCFS)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of exchangeable Cd related to free form Cd in root cell free space (RCFS) increased after the treatment with Si”
e1“rice(Oryza sativas L.) seedlings”
Claim · model-written summary
Authors attribute improved cadmium resistance to reduced absorption and upward transport and greater cell-wall and exchangeable cadmium localization.
- Taxon
- riceOryza sativae1
- Treatment
- Sie0
- Outcome
- improved Cd-resistancee0
- Qualifier
- inhibition of Cd absorption by the plants and Cd transport to the upper partse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the improved Cd-resistance by Si would result from not only the inhibition of Cd absorption by the plants and Cd transport to the upper parts, but also the enhancement of Cd localization in cell walls and the exchangeable Cd in RCFS”
e1“rice(Oryza sativas L.) seedlings”
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