Abstract
Taking 2-year old seedlings of Zelkova serrata,a Chinese second class key protected wild plant as test materials,this paper studied effects of 2.5 months simulated acid rain that included 4 different pH values(2.5,3.5,4.5 and 5.6,5.6 as CK) on the gas exchange parameters,chlorophyll content and antioxidant enzyme activities of Z.serrata seedlings leaves.The results showed that with the decreasing of simulated acid rain pH value,the relative conductivities and malondialdehyde(MDA) content of leaves gradually increased,and there was a significant correlation between them.The net photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr) all showed a trend of increase first and then decrease,however,intercellular CO2 concentration(Ci) decreased continuously.The stomatal limitation value(Ls) showed an trend of gradual increase.Chl a and Chl b content decreased gradually,while the value of Chl a/Chl b showed no significant difference.The dismutase(SOD),catalase(CAT) and peroxidase(POD) activities were showed a single-peak curve which was firstly increased and then decreased,and the maximum of SOD appeared at pH 3.5,CAT and POD appeared at pH 4.5.The Pn value was the biggest,the antioxidant enzymes was high,and the injuries was small,when Z.serrata were stressed in simulated acid rain of pH 4.5.Therefore,Zelkova serrata can be considered as one of the landscaping species in East China.
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Claims 11
Claim · model-written summary
Lower acid rain pH increased leaf relative conductivity and MDA content.
- Taxon
- Zelkova serrata
Zelkova serratat0 - Organ / stage
- leavese0
- Treatment
- simulated acid raine0
- Outcome
- relative conductivities and malondialdehyde(MDA) contente0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the decreasing of simulated acid rain pH value,the relative conductivities and malondialdehyde(MDA) content of leaves gradually increased”
t0“Zelkova serrata”
Claim · model-written summary
Leaf relative conductivity and MDA content were significantly correlated.
- Taxon
- Zelkova serrataZelkova serratat0
- Organ / stage
- leavese1
- Outcome
- relative conductivities and malondialdehyde(MDA) contente1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a significant correlation between them”
t0“Zelkova serrata”
e1“the relative conductivities and malondialdehyde(MDA) content of leaves gradually increased”
Claim · model-written summary
Photosynthetic, stomatal and transpiration rates first increased and then decreased as acid rain pH declined.
- Taxon
- Zelkova serrataZelkova serratat0
- Treatment
- simulated acid raine1
- Outcome
- net photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr)e0
- Direction
- increase first and then decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr) all showed a trend of increase first and then decrease”
t0“Zelkova serrata”
e1“simulated acid rain pH value”
Claim · model-written summary
Intercellular CO2 concentration declined continuously.
- Taxon
- Zelkova serrataZelkova serratat0
- Outcome
- intercellular CO2 concentration(Ci)e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intercellular CO2 concentration(Ci) decreased continuously.”
t0“Zelkova serrata”
Claim · model-written summary
Stomatal limitation gradually increased.
- Taxon
- Zelkova serrataZelkova serratat0
- Outcome
- stomatal limitation value(Ls)e0
- Direction
- gradual increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomatal limitation value(Ls) showed an trend of gradual increase.”
t0“Zelkova serrata”
Claim · model-written summary
Chlorophyll a and b contents declined gradually.
- Taxon
- Zelkova serrataZelkova serratat0
- Outcome
- Chl a and Chl b contente0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chl a and Chl b content decreased gradually”
t0“Zelkova serrata”
Claim · model-written summary
Chlorophyll a to b ratio showed no significant difference.
- Taxon
- Zelkova serrataZelkova serratat0
- Outcome
- value of Chl a/Chl be0
- Direction
- no significant differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the value of Chl a/Chl b showed no significant difference.”
t0“Zelkova serrata”
Claim · model-written summary
SOD activity peaked at pH 3.5 after rising and falling.
- Taxon
- Zelkova serrataZelkova serratat0
- Gene
- dismutase(SOD)e0
- Outcome
- dismutase(SOD)e0
- Direction
- maximume0
- Value
- pH 3.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dismutase(SOD),catalase(CAT) and peroxidase(POD) activities were showed a single-peak curve which was firstly increased and then decreased,and the maximum of SOD appeared at pH 3.5”
t0“Zelkova serrata”
Claim · model-written summary
CAT and POD activities peaked at pH 4.5.
- Taxon
- Zelkova serrataZelkova serratat0
- Gene
- CAT and PODe0
- Outcome
- CAT and PODe0
- Direction
- maximume1
- Value
- pH 4.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT and POD appeared at pH 4.5”
t0“Zelkova serrata”
e1“the maximum of SOD appeared at pH 3.5,CAT and POD appeared at pH 4.5”
Claim · model-written summary
At pH 4.5, photosynthesis was greatest, antioxidant activity high and injury low.
- Taxon
- Z.serrataZelkova serratae0
- Treatment
- simulated acid rain of pH 4.5e0
- Outcome
- Pn valuee0
- Direction
- biggeste0
- Qualifier
- antioxidant enzymes was high,and the injuries was smalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Pn value was the biggest,the antioxidant enzymes was high,and the injuries was small,when Z.serrata were stressed in simulated acid rain of pH 4.5.”
Claim · model-written summary
The authors propose Zelkova serrata for landscaping in East China.
- Taxon
- Zelkova serrataZelkova serratae0
- Outcome
- landscaping speciese0
- Setting
- East Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zelkova serrata can be considered as one of the landscaping species in East China.”