Abstract
Contamination of the environment with toxic heavy metals due to anthropogenic activities is one of the major global environmental and human health problems.Cadmium severely inhibits plant growth and even causes plant death by disturbing the uptake of nutrients and inhibiting photosynthesis via degradation of chlorophyll.Two rice(Oryza sativa L.) cultivars: Wuyujing No.3,a Cd tolerant cultivar and Shanyou 63,a Cd susceptible cultivar,were grown hydroponically in this study to investigate the effects of Cd applied at realistic levels on photosynthetic parameters,soluble sugar and plant growth.Rice seedlings were grown in nutrient solutions with cadmium applied at the rate of Cd 0,1.0 or 5.0 (μmol/L).The results showed that the photosynthesis of the leaves was significantly inhibited under Cd stress.In comparison with the control,Cd treatment induced a decline in net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),stomatal limitation value(Ls) and transpiration efficiency(Te) in seedlings and this Cd-induced reduction was significantly dose-dependent. Cadmium treatment increased the concentration of soluble sugar significantly in both cultivars but decreased the content of leaf chlorophyll only in the susceptible cultivar at 5.0 Cd μmol/L.Shoot growth(length) was significantly reduced in the susceptible cultivar only at Cd 5.0 μmol/L,but root growth(length) was significantly inhibited at either Cd 1.0 or 5.0 μmol/L.In contrast,shoot and root growth(length) was unaffected in the tolerant cultivar compared to the control.These results suggested that there was significant genotypical difference in rice in response to Cd toxicity.
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Claims 8
Claim · model-written summary
Compared with the control, Cd treatment reduced net photosynthetic rate, stomatal conductance and transpiration rate in rice seedlings, significantly and dose-dependently.
- Taxon
- rice
Oryza sativat0 - Treatment
- Cd treatmente0
- Outcome
- net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr)e0
- Direction
- declinee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In comparison with the control,Cd treatment induced a decline in net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr)”
t0“rice”
Claim · model-written summary
Compared with the control, Cd treatment reduced stomatal limitation value and transpiration efficiency in rice seedlings, significantly and dose-dependently.
- Taxon
- riceOryza sativat0
- Treatment
- Cd treatmente0
- Outcome
- stomatal limitation value(Ls) and transpiration efficiency(Te)e0
- Direction
- declinee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In comparison with the control,Cd treatment induced a decline in net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),stomatal limitation value(Ls) and transpiration efficiency(Te)”
t0“rice”
Claim · model-written summary
Cadmium treatment significantly increased leaf soluble sugar concentration in both rice cultivars.
- Taxon
- riceOryza sativat0
- Treatment
- Cadmium treatmente0
- Outcome
- concentration of soluble sugare0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cadmium treatment increased the concentration of soluble sugar significantly in both cultivars”
t0“rice”
Claim · model-written summary
Cd decreased leaf chlorophyll content only in the susceptible cultivar, at 5.0 Cd μmol/L.
- Taxon
- riceOryza sativat0
- Material
- susceptible cultivare0
- Treatment
- 5.0 Cd μmol/Le0
- Outcome
- content of leaf chlorophylle0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cadmium treatment increased the concentration of soluble sugar significantly in both cultivars but decreased the content of leaf chlorophyll only in the susceptible cultivar at 5.0 Cd μmol/L”
t0“rice”
Claim · model-written summary
Shoot length was significantly reduced in the susceptible cultivar only at Cd 5.0 μmol/L.
- Taxon
- riceOryza sativat0
- Material
- susceptible cultivare0
- Treatment
- Cd 5.0 μmol/Le0
- Outcome
- Shoot growth(length)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth(length) was significantly reduced in the susceptible cultivar only at Cd 5.0 μmol/L”
t0“rice”
Claim · model-written summary
Root length was significantly inhibited at either Cd 1.0 or 5.0 μmol/L.
- Taxon
- riceOryza sativat0
- Treatment
- Cd 1.0 or 5.0 μmol/Le0
- Outcome
- root growth(length)e0
- Direction
- inhibitede0
Not reportedMaterialComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth(length) was significantly inhibited at either Cd 1.0 or 5.0 μmol/L”
t0“rice”
Claim · model-written summary
Shoot and root length were unaffected in the tolerant cultivar compared with the control.
- Taxon
- riceOryza sativat0
- Material
- tolerant cultivare0
- Outcome
- shoot and root growth(length)e0
- Direction
- unaffectede0
- Comparator
- controle0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot and root growth(length) was unaffected in the tolerant cultivar compared to the control”
t0“rice”
Claim · model-written summary
The authors conclude that rice shows significant genotypic differences in response to Cd toxicity.
- Taxon
- riceOryza sativae0
- Outcome
- significant genotypical differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was significant genotypical difference in rice in response to Cd toxicity”
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