Abstract
Plant species capable of accumulating heavy metals are of considerable interest for phytoremediation and phytomining. The mechanism of Mn tolerance/hyperaccumulate in Phytolacca americana L. is less known. To elucidate the role of antioxidative enzyme in response to Mn, the 6-week-old seedling of Mn hyperaccumulator P. americana and non-accumulator-tobacco (Nicotiana tabacum) were exposed to half strength Hoagland solution with 1 mmol x L(-1) or 3 mmol x L(-1) MnCl2 for 4 days. The photosynthetic rate in P. americana decreased more slowly than that in tobacco, while the MDA content and electrolyte leakage in tobacco increased more rapidly than that in P. americana. For example, after exposure to 1 mmol x L(-1) Mn for 4 days, the photosynthetic rates of P. americana and tobacco in comparison to the control reduced by 13.3% and 75.5%, respectively. The MDA content and electrolyte leakage in tobacco increased by 347.3% and 120.1%, respectively, whereas Mn had no marked effect on both of it in P. americana, indicated that the oxidative damage in tobacco was more serious than that in P. americana. The activities of SOD and POD of both species increased rapidly with elevated Mn concentration and exposure time in both species, the increase of SOD activity in P. americana was higher than that in tobacco. CAT activity in tobacco declined rapidly, while the activity of CAT in P. americana was increased. The activities of SOD, POD and CAT in P. americana upon 1 mmol x L(-1) Mn exposure increased by 161.1%, 111.3% and 17.5%, respectively. The activities of SOD and POD in tobacco increased by 55.5% and 206.0%, respectively, while CAT activity decreased by 15.6%, indicating that the antioxidative enzymes in P. americana, particularly in CAT,could fully scavenge the reactive oxygen species generated by Mn toxicity. These results collectively indicate that the enzymatic antioxidation capacity is one of the important mechanisms responsible for Mn tolerance in hyperaccumulator plant species.
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Claims 11
Claim · model-written summary
Photosynthetic rate in P. americana fell 13.3% after Mn exposure.
- Taxon
- P. americana
.jpg?width=60)
Phytolacca americanae0 - Treatment
- 1 mmol x L(-1) Mn for 4 dayse0
- Outcome
- photosynthetic ratese0
- Direction
- reducede0
- Value
- 13.3%e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“after exposure to 1 mmol x L(-1) Mn for 4 days, the photosynthetic rates of P. americana and tobacco in comparison to the control reduced by 13.3% and 75.5%, respectively”
Claim · model-written summary
Photosynthetic rate in tobacco fell 75.5% after Mn exposure.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- 1 mmol x L(-1) Mn for 4 dayse0
- Outcome
- photosynthetic ratese0
- Direction
- reducede0
- Value
- 75.5%e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after exposure to 1 mmol x L(-1) Mn for 4 days, the photosynthetic rates of P. americana and tobacco in comparison to the control reduced by 13.3% and 75.5%, respectively”
Claim · model-written summary
Tobacco MDA content rose 347.3% under Mn.
- Taxon
- tobaccoNicotiana tabacume0
- Outcome
- MDA contente0
- Direction
- increasede0
- Value
- 347.3%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MDA content and electrolyte leakage in tobacco increased by 347.3% and 120.1%, respectively”
Claim · model-written summary
Tobacco electrolyte leakage rose 120.1% under Mn.
- Taxon
- tobaccoNicotiana tabacume0
- Outcome
- electrolyte leakagee0
- Direction
- increasede0
- Value
- 120.1%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The MDA content and electrolyte leakage in tobacco increased by 347.3% and 120.1%, respectively”
Claim · model-written summary
Mn had no marked effect on MDA content or electrolyte leakage in P. americana.
- Taxon
- P. americanaPhytolacca americanae0
- Treatment
- Mne0
- Outcome
- both of ite0
- Direction
- no marked effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas Mn had no marked effect on both of it in P. americana”
Claim · model-written summary
SOD activity in P. americana rose 161.1% at 1 mmol x L(-1) Mn.
- Taxon
- P. americanaPhytolacca americanae0
- Treatment
- 1 mmol x L(-1) Mn exposuree0
- Gene
- SODe0
- Outcome
- activities of SODe0
- Direction
- increasede0
- Value
- 161.1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD, POD and CAT in P. americana upon 1 mmol x L(-1) Mn exposure increased by 161.1%, 111.3% and 17.5%, respectively.”
Claim · model-written summary
POD activity in P. americana rose 111.3% at 1 mmol x L(-1) Mn.
- Taxon
- P. americanaPhytolacca americanae0
- Treatment
- 1 mmol x L(-1) Mn exposuree0
- Gene
- PODe0
- Outcome
- PODe0
- Direction
- increasede0
- Value
- 111.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD, POD and CAT in P. americana upon 1 mmol x L(-1) Mn exposure increased by 161.1%, 111.3% and 17.5%, respectively.”
Claim · model-written summary
CAT activity in P. americana rose 17.5% at 1 mmol x L(-1) Mn.
- Taxon
- P. americanaPhytolacca americanae0
- Treatment
- 1 mmol x L(-1) Mn exposuree0
- Gene
- CATe0
- Outcome
- CATe0
- Direction
- increasede0
- Value
- 17.5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD, POD and CAT in P. americana upon 1 mmol x L(-1) Mn exposure increased by 161.1%, 111.3% and 17.5%, respectively.”
Claim · model-written summary
SOD activity in tobacco rose 55.5% under Mn.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD and POD in tobacco increased by 55.5% and 206.0%, respectively, while CAT activity decreased by 15.6%”
Claim · model-written summary
POD activity in tobacco rose 206.0% under Mn.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD and POD in tobacco increased by 55.5% and 206.0%, respectively, while CAT activity decreased by 15.6%”
Claim · model-written summary
CAT activity in tobacco fell 15.6% under Mn.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of SOD and POD in tobacco increased by 55.5% and 206.0%, respectively, while CAT activity decreased by 15.6%”
The same questions in other papers
manganese atom · physiology: photosynthesis · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
manganese atom · physiology: antioxidant enzymes · Phytolacca americana (American pokeweed)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.