Abstract
A sand culture experiment was conducted to investigate the effects of zinc(Zn) with different concentration(10~100 mg L-1) on the chlorophyll relative content(SPAD),the accumulation of malondialdehyde(MDA) and proline,and the antioxidant enzyme activities of wheat seedlings under mercury(Hg) stress(10 mg L-1).The results showed that,under the Hg(10 mg L-1) stress treatment alone,the SPAD of wheat seedlings decreased,and both superoxide dismutas(SOD) and catalase(CAT) activities were inhibited,whereas MDA and proline content were increased.When treated together with 10 mg L-1Zn,SPAD increased by 5.6%,MDA levels decreased by 32.4%,indicating that the concentration of Zn to some extent alleviated the toxicity of Hg in wheat seedlings.However,when Zn concentration was higher than 10 mg L-1 SPAD gradually decreased and MDA content significantly increased,suggesting that with the increasing of Zn concentration,Zn alleviation of the toxicity of Hg decreased.Lower concentration of Zn(10~20 mg L-1) promoted the activity of SOD and CAT,which gradually increased with the increasing of Zn concentration.At 20 mg L-1 of Zn,the activities of the two enzymes were increased by 103.3% and 71.0% respectively compared with the Hg treatment alone.Under the higher concentration of Zn(50~100 mg L-1) treatment,the activities of the two enzymes showed downward trends.Within the test concentration,the proline content was lower than that of Hg treatment alone,and less than that of the control,indicating that additional Zn inhibited the formation of proline.In summary,10~20 mg L-1 of Zn eased the wheat seedling poisoning which was caused by Hg at 10 mg L-1 to a certain extent.
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Claims 11
Claim · model-written summary
Mercury stress decreased wheat seedling SPAD and inhibited SOD and CAT activities.
- Taxon
- wheat seedlings
Triticum aestivume0 - Treatment
- Hg(10 mg L-1) stress treatment alonee0
- Outcome
- SPAD of wheat seedlingse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the Hg(10 mg L-1) stress treatment alone,the SPAD of wheat seedlings decreased,and both superoxide dismutas(SOD) and catalase(CAT) activities were inhibited”
Claim · model-written summary
Mercury stress increased wheat seedling MDA and proline content.
- Taxon
- wheat seedlingsTriticum aestivume0
- Treatment
- Hg(10 mg L-1) stress treatment alonee0
- Outcome
- MDA and proline contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the Hg(10 mg L-1) stress treatment alone,the SPAD of wheat seedlings decreased,and both superoxide dismutas(SOD) and catalase(CAT) activities were inhibited,whereas MDA and proline content were increased”
Claim · model-written summary
Adding 10 mg L-1 Zn increased SPAD by 5.6% under mercury stress.
Not reportedTaxonComparator
Verbatim
e0“When treated together with 10 mg L-1Zn,SPAD increased by 5.6%”
Claim · model-written summary
Adding 10 mg L-1 Zn decreased MDA by 32.4% under mercury stress.
Not reportedTaxonComparator
Verbatim
e0“When treated together with 10 mg L-1Zn,SPAD increased by 5.6%,MDA levels decreased by 32.4%”
Claim · model-written summary
At Zn concentrations above 10 mg L-1, SPAD gradually decreased.
Not reportedTaxonComparator
Verbatim
e0“when Zn concentration was higher than 10 mg L-1 SPAD gradually decreased”
Claim · model-written summary
At Zn concentrations above 10 mg L-1, MDA increased significantly.
Not reportedTaxonComparator
Verbatim
e0“when Zn concentration was higher than 10 mg L-1 SPAD gradually decreased and MDA content significantly increased”
Claim · model-written summary
Lower Zn concentrations promoted SOD and CAT activity.
Not reportedTaxonComparator
Verbatim
e0“Lower concentration of Zn(10~20 mg L-1) promoted the activity of SOD and CAT”
Claim · model-written summary
At 20 mg L-1 Zn, SOD activity increased 103.3% relative to mercury alone.
- Treatment
- 20 mg L-1 of Zne0
- Outcome
- activities of the two enzymese0
- Direction
- increasede0
- Value
- 103.3%e0
- Comparator
- Hg treatment alonee0
Not reportedTaxon
Verbatim
e0“At 20 mg L-1 of Zn,the activities of the two enzymes were increased by 103.3% and 71.0% respectively compared with the Hg treatment alone”
Claim · model-written summary
At 20 mg L-1 Zn, CAT activity increased 71.0% relative to mercury alone.
- Treatment
- 20 mg L-1 of Zne0
- Outcome
- activities of the two enzymese0
- Direction
- increasede0
- Value
- 71.0%e0
- Comparator
- Hg treatment alonee0
Not reportedTaxon
Verbatim
e0“At 20 mg L-1 of Zn,the activities of the two enzymes were increased by 103.3% and 71.0% respectively compared with the Hg treatment alone”
Claim · model-written summary
Higher Zn concentrations produced downward trends in SOD and CAT activity.
- Treatment
- Zn(50~100 mg L-1) treatmente0
- Outcome
- activities of the two enzymese0
- Direction
- downward trendse0
Not reportedTaxonComparator
Verbatim
e0“Under the higher concentration of Zn(50~100 mg L-1) treatment,the activities of the two enzymes showed downward trends”
Claim · model-written summary
Added Zn lowered proline content relative to mercury alone and control.
Not reportedTaxon
Verbatim
e0“the proline content was lower than that of Hg treatment alone,and less than that of the control,indicating that additional Zn inhibited the formation of proline”
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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.