Abstract
Effects of salt stress on photosynthetic characteristics of 1-year-old potted mulberry (Morus alba) seedlings,a common stock of mulberry,were investigated. The seedlings were treated with NaCl concentrations at 0.1%,0.3%,0.5% and 0.7%,fresh water as the control. Using LI-COR 6400 portable photosynthesis system,the net photosynthetic rate (P_n),stomatal conductance(G_s),intercellular CO_2 concentrations(C_i) and transpiration rate(T_r) were measured on 1~ st ,2~ nd ,3~ rd and 7~ th day after treatments,and the light response curves and the CO_2 response curves of the net photosynthetic rate were measured on 3~ rd day after treatments. The results showed that 0.1% NaCl did not affects the photosynthetic characteristics of the seedlings,however,while salt concentration≥0.3%,the salinity significantly reduced P_n,G_s,T_r,WUE,SUE and CUE,but enhanced C_i. P_n under 0.1% NaCl treatments was a little bigger than that of the control. Under lower salt concentration treatments,P_n decrease was mainly controlled by the stomatal limits,whereas under higher salt concentration treatments,P_n decrease was mainly due to the non-stomatal limits. The net photosynthetic rate under various treatments all gradually increased with PAR or CO_2 concentration increasing,however,effects of PAR or CO_2 concentration on P_n significantly varied among different NaCl concentration treatments. It was showed that effects of them on P_n decreased with NaCl concentration increasing. In addition,salinity also had an obvious impact on the light compensationpoint(LCP),light saturation point(LSP),apparent quantum yield(AQY),apparent maximum photosynthetic rate(P_ max ),the CO_2 compensation point(LCP)and apparent carboxyl efficiency (ACE). In general,P_ max ,AQY,LSP,CCP and ACE decreased,but LCP increased with NaCl concentration increasing.
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Claims 12
Claim · model-written summary
At 0.1% NaCl, seedling photosynthetic characteristics were unaffected.
- Taxon
- Mulberryt0
- Treatment
- 0.1% NaCle0
- Outcome
- photosynthetic characteristicse0
- Direction
- did not affectse0
Not reportedComparator
Verbatim
e0“0.1% NaCl did not affects the photosynthetic characteristics of the seedlings”
t0“Mulberry Seedlings”
Claim · model-written summary
At NaCl concentrations of at least 0.3%, net photosynthesis, stomatal conductance and transpiration declined.
Not reportedComparator
Verbatim
e0“salt concentration≥0.3%,the salinity significantly reduced P_n,G_s,T_r,WUE,SUE and CUE,but enhanced C_i.”
t0“Mulberry Seedlings”
Claim · model-written summary
At NaCl concentrations of at least 0.3%, WUE, SUE and CUE declined.
Not reportedComparator
Verbatim
e0“salt concentration≥0.3%,the salinity significantly reduced P_n,G_s,T_r,WUE,SUE and CUE,but enhanced C_i.”
t0“Mulberry Seedlings”
Claim · model-written summary
At NaCl concentrations of at least 0.3%, intercellular CO2 increased.
Not reportedComparator
Verbatim
e0“salt concentration≥0.3%,the salinity significantly reduced P_n,G_s,T_r,WUE,SUE and CUE,but enhanced C_i.”
t0“Mulberry Seedlings”
Claim · model-written summary
Net photosynthesis under 0.1% NaCl was slightly above the control.
Verbatim
e0“P_n under 0.1% NaCl treatments was a little bigger than that of the control.”
t0“Mulberry Seedlings”
Claim · model-written summary
At lower salt concentration, stomatal limits mainly controlled the decrease in net photosynthesis.
Verbatim
e0“Under lower salt concentration treatments,P_n decrease was mainly controlled by the stomatal limits”
t0“Mulberry Seedlings”
Claim · model-written summary
At higher salt concentration, non-stomatal limits mainly caused the decline in net photosynthesis.
Verbatim
e0“under higher salt concentration treatments,P_n decrease was mainly due to the non-stomatal limits.”
t0“Mulberry Seedlings”
Claim · model-written summary
Net photosynthesis rose with increasing PAR or CO2 under all treatments.
Verbatim
e0“The net photosynthetic rate under various treatments all gradually increased with PAR or CO_2 concentration increasing”
t0“Mulberry Seedlings”
Claim · model-written summary
The effects of PAR or CO2 on net photosynthesis declined as NaCl concentration increased.
Verbatim
e0“effects of PAR or CO_2 concentration on P_n significantly varied among different NaCl concentration treatments. It was showed that effects of them on P_n decreased with NaCl concentration increasing.”
t0“Mulberry Seedlings”
Claim · model-written summary
P_max, AQY and LSP decreased with increasing NaCl.
Verbatim
e0“P_ max ,AQY,LSP,CCP and ACE decreased,but LCP increased with NaCl concentration increasing.”
t0“Mulberry Seedlings”
Claim · model-written summary
CCP and ACE decreased with increasing NaCl.
Verbatim
e0“P_ max ,AQY,LSP,CCP and ACE decreased,but LCP increased with NaCl concentration increasing.”
t0“Mulberry Seedlings”
Claim · model-written summary
LCP increased with increasing NaCl.
Verbatim
e0“P_ max ,AQY,LSP,CCP and ACE decreased,but LCP increased with NaCl concentration increasing.”
t0“Mulberry Seedlings”
The same questions in other papers
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- negative
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1 paper more in this group
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2 papers in the same direction as this paper
- negative
- negative
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.