Abstract
[Objective] The research aimed to study the stomatal and nonstomatal limitations of photosynthesis in P.radiatus L.seedling leaves under the combination of enhanced UV-B radiation and Cd2+ stress.[Method] The test designed one control group and 3 test groups,enhanced UV-B radiation(UV-B) group,Cd2+(Cd) group and enhanced UV-B radiation+Cd2+(UV-B+Cd) group respectively.Stomatl and nonstomatal limitations of photosynthesis in P.radiatus L.seedling leaves under the combination of 0.35 W/m2 UV-B radiation and 1 μmol/L Cd2+ stress were studied.Cd concentration in root,hypocotyls,and leaf were determined by atomic absorption spectrometer,respectively.The photosynthetic parameters of the first pair leaves of P.radiatus L.seeding were monitored by TPS-1 photosynthesis system or calculated according to the theory of Farquhar and Sharkey.[Result] Cd concentration allocated in different parts of P.radiatus L.was roothypocotylleaf,and UV-B group had no effect on the absorption and allocation in P.radiatus L..In addition,separated or combined treatments of enhanced UV-B radiation and Cd2+ stress all resulted in a decrease in net photosynthetic rate,stomatal conductance,photosynthetic ability,efficiency of CO2 carboxylation and rubisco content.That intercellular CO2 concentration increased and stomatal limitation value decreased under UV-B treatment indicated that the inhibition of photosynthesis in P.radiatus L.seedling leaves was nonstomatal limitation.That intercellular CO2 concentration decreased and stomatal limitation value increased under Cd treatment and combined treatment showed that the inhibition of photosynthesis in Cd treatment was stomatal limitation and the combined treatment was the results of stomatal and nonstomatal limination.[Conclusion] The study reveals the main factors of photosynthetic changes of P.radiatus L.seedling under the combination of enhanced UV-B radiation and Cd2+ stress,can provide the scientific basis for deeply research.
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Claims 11
Claim · model-written summary
Cadmium concentration was ordered root, hypocotyl, then leaf.
Verbatim
e0“Cd concentration allocated in different parts of P.radiatus L.was roothypocotylleaf”
Claim · model-written summary
UV-B did not affect cadmium absorption or allocation.
Not reportedComparator
Verbatim
e0“UV-B group had no effect on the absorption and allocation in P.radiatus L..”
Claim · model-written summary
Separate or combined UV-B and cadmium treatments decreased net photosynthetic rate, stomatal conductance and photosynthetic ability.
- Taxon
- P.radiatus L.t0
- Treatment
- enhanced UV-B radiation and Cd2+ stresse0
- Outcome
- net photosynthetic rate,stomatal conductance,photosynthetic abilitye0
- Direction
- decreasee0
Not reportedComparator
Verbatim
e0“separated or combined treatments of enhanced UV-B radiation and Cd2+ stress all resulted in a decrease in net photosynthetic rate,stomatal conductance,photosynthetic ability,efficiency of CO2 carboxylation and rubisco content”
t0“P.radiatus L.”
Claim · model-written summary
Separate or combined UV-B and cadmium treatments decreased CO2 carboxylation efficiency and rubisco content.
- Taxon
- P.radiatus L.t0
- Treatment
- enhanced UV-B radiation and Cd2+ stresse0
- Outcome
- efficiency of CO2 carboxylation and rubisco contente0
- Direction
- decreasee0
Not reportedComparator
Verbatim
e0“separated or combined treatments of enhanced UV-B radiation and Cd2+ stress all resulted in a decrease in net photosynthetic rate,stomatal conductance,photosynthetic ability,efficiency of CO2 carboxylation and rubisco content”
t0“P.radiatus L.”
Claim · model-written summary
UV-B increased intercellular CO2 concentration.
- Taxon
- P.radiatus L.t0
- Treatment
- UV-B treatmente0
- Outcome
- intercellular CO2 concentratione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“intercellular CO2 concentration increased and stomatal limitation value decreased under UV-B treatment”
t0“P.radiatus L.”
Claim · model-written summary
UV-B decreased the stomatal limitation value.
Not reportedComparator
Verbatim
e0“intercellular CO2 concentration increased and stomatal limitation value decreased under UV-B treatment”
t0“P.radiatus L.”
Claim · model-written summary
Cadmium and combined treatments decreased intercellular CO2 concentration.
- Taxon
- P.radiatus L.t0
- Treatment
- Cd treatment and combined treatmente0
- Outcome
- intercellular CO2 concentratione0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“intercellular CO2 concentration decreased and stomatal limitation value increased under Cd treatment and combined treatment”
t0“P.radiatus L.”
Claim · model-written summary
Cadmium and combined treatments increased the stomatal limitation value.
- Taxon
- P.radiatus L.t0
- Treatment
- Cd treatment and combined treatmente0
- Outcome
- stomatal limitation valuee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“intercellular CO2 concentration decreased and stomatal limitation value increased under Cd treatment and combined treatment”
t0“P.radiatus L.”
Claim · model-written summary
The authors inferred nonstomatal limitation under UV-B treatment.
Verbatim
e0“the inhibition of photosynthesis in P.radiatus L.seedling leaves was nonstomatal limitation”
Claim · model-written summary
The authors inferred stomatal limitation under cadmium treatment.
Verbatim
e0“the inhibition of photosynthesis in Cd treatment was stomatal limitation”
t0“P.radiatus L.”
Claim · model-written summary
The authors inferred both stomatal and nonstomatal limitation under the combined treatment.
Verbatim
e0“the combined treatment was the results of stomatal and nonstomatal limination”
t0“P.radiatus L.”
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See all 7 papers →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.