Abstract
Abstract Silicon (Si)‐induced cadmium (Cd) tolerance in rice ( Oryza sativa L.) was investigated by analyzing Cd uptake, growth, and physiological parameters. Silicon treatments (0.0, 0.2, or 0.6 mM) were added to 6 d–old seedlings, and Cd treatments (0.0 or 5.0 μM) were added to 20 d–old seedlings. Parameters determined included: maximum net CO 2 assimilation ( A max ), stomatal conductance ( g smax ), and transpiration ( E max ) rates at varying intercellular CO 2 concentrations ( C i ). Also measured were chlorophyll fluorescence, growth, and Cd‐uptake parameters. Results showed a Si‐induced inhibition of Cd uptake. However, 0.2 mM or 0.6 mM Si treatment concentrations did not differentially inhibit Cd uptake or differentially alleviate Cd‐induced growth inhibition, despite a significant increase in tissue Si concentration due to 0.6 mM Si treatment compared to 0.2 mM Si treatment. Additionally, photosynthesis and chlorophyll‐fluorescence analysis showed that treatment with Cd significantly inhibited photosynthetic efficiency. Interestingly, the addition of 0.2 mM Si, more so than the addition of 0.6 mM Si, significantly alleviated the inhibitory effects of Cd toxicity on photosynthesis and chlorophyll‐fluorescence parameters. Our results suggest that 0.2 mM Si could be close to an optimum Si‐dose requirement for the alleviation of toxicity symptoms mediated by moderate (5 μM) Cd exposure.
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Claims 8
Claim · model-written summary
Silicon treatment inhibited cadmium uptake in rice.
- Taxon
- rice
Oryza sativat0 - Treatment
- Sie0
- Outcome
- Cd uptakee0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Results showed a Si‐induced inhibition of Cd uptake”
Claim · model-written summary
Silicon doses of 0.2 and 0.6 mM did not differ in inhibiting cadmium uptake.
- Taxon
- riceOryza sativat0
- Treatment
- 0.2 mM Sie1
- Outcome
- Cd uptakee0
- Direction
- did not differentially inhibite0
- Comparator
- 0.6 mM Sie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“0.2 mM or 0.6 mM Si treatment concentrations did not differentially inhibit Cd uptake”
e1“0.2 mM Si treatment”
Claim · model-written summary
Silicon doses of 0.2 and 0.6 mM did not differ in alleviating cadmium-induced growth inhibition.
- Taxon
- riceOryza sativat0
- Treatment
- 0.2 mM Sie1
- Outcome
- Cd‐induced growth inhibitione0
- Direction
- differentially alleviatee0
- Comparator
- 0.6 mM Sie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“0.2 mM or 0.6 mM Si treatment concentrations did not differentially inhibit Cd uptake or differentially alleviate Cd‐induced growth inhibition”
e1“0.2 mM Si treatment”
Claim · model-written summary
The 0.6 mM silicon treatment significantly increased rice tissue silicon concentration relative to 0.2 mM.
- Taxon
- riceOryza sativat0
- Treatment
- 0.6 mM Si treatmente0
- Outcome
- tissue Si concentratione0
- Direction
- increasee0
- Comparator
- 0.2 mM Si treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“a significant increase in tissue Si concentration due to 0.6 mM Si treatment compared to 0.2 mM Si treatment”
Claim · model-written summary
Cadmium significantly inhibited rice photosynthetic efficiency.
- Taxon
- riceOryza sativat0
- Treatment
- Cde0
- Outcome
- photosynthetic efficiencye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“treatment with Cd significantly inhibited photosynthetic efficiency”
Claim · model-written summary
Silicon at 0.2 mM alleviated cadmium injury to photosynthesis more than silicon at 0.6 mM.
- Taxon
- riceOryza sativat0
- Treatment
- 0.2 mM Sie0
- Outcome
- photosynthesise0
- Direction
- alleviatede0
- Comparator
- 0.6 mM Sie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“the addition of 0.2 mM Si, more so than the addition of 0.6 mM Si, significantly alleviated the inhibitory effects of Cd toxicity on photosynthesis and chlorophyll‐fluorescence parameters”
Claim · model-written summary
Silicon at 0.2 mM alleviated cadmium injury to chlorophyll fluorescence more than silicon at 0.6 mM.
- Taxon
- riceOryza sativat0
- Treatment
- 0.2 mM Sie0
- Outcome
- chlorophyll‐fluorescence parameterse0
- Direction
- alleviatede0
- Comparator
- 0.6 mM Sie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“the addition of 0.2 mM Si, more so than the addition of 0.6 mM Si, significantly alleviated the inhibitory effects of Cd toxicity on photosynthesis and chlorophyll‐fluorescence parameters”
Claim · model-written summary
The authors suggest 0.2 mM silicon may be near optimal for mitigating toxicity at 5 μM cadmium exposure.
- Taxon
- riceOryza sativat0
- Treatment
- 0.2 mM Sie0
- Outcome
- optimum Si‐dose requirement for the alleviation of toxicity symptomse0
- Qualifier
- moderate (5 μM) Cd exposuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“0.2 mM Si could be close to an optimum Si‐dose requirement for the alleviation of toxicity symptoms mediated by moderate (5 μM) Cd exposure”
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