Abstract
To evaluate the role of methyl jasmonate (MeJA) on ozone (O3: 0, 0.1, 0.3 cm3 m−3; abbreviated respectively as O0, O0.1 and O0.3)-induced photosynthetic inhibition of rice leaves at different atmospheric carbon dioxide (CO2) concentrations (400 and 800 cm3 m−3; abbreviated respectively as C400 and C800), MeJA solutions (0, 10, 100 μM; abbreviated respectively as M0, M10, and M100) were applied one day before acute exposure (5 h) of O3. Gas exchange, chlorophyll fluorescence and ascorbic acid were measured immediately before (BE), immediately after (AE-0), and 1 d and 3 d after (AE-1, AE-3) O3 exposure. The net photosynthetic rate (PN), and maximum (Fv/ Fm) and operating (Fq′/Fm′) quantum efficiencies of photosystem II (PSII) were decreased by O3 exposure at AE-0. However, MeJA ameliorated the O3-inhibition of Fv/Fm and Fq′/Fm′ of PS II. Rapid recovery from O3-inhibition of PN was observed as a result of MeJA application, but MeJA decreased the PN and stomatal conductance (gs) at AE-0. The O3 decreased the total ascorbic acid content, although the MeJA increased it. The effects of MeJA on the O3-inhibition of PSII and ascorbic acid content at C800 were less than at C400.
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Claims 7
Claim · model-written summary
Ozone decreased net photosynthetic rate and two PSII quantum efficiencies immediately after exposure.
- Taxon
- rice
Oryza sativat0 - Treatment
- O3 exposuree0
- Outcome
- net photosynthetic rate (PN), and maximum (Fv/ Fm) and operating (Fq′/Fm′) quantum efficienciese0
- Direction
- decreasede0
- Qualifier
- AE-0e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthetic rate (PN), and maximum (Fv/ Fm) and operating (Fq′/Fm′) quantum efficiencies of photosystem II (PSII) were decreased by O3 exposure at AE-0.”
t0“Paddy Rice”
Claim · model-written summary
Methyl jasmonate ameliorated ozone inhibition of both PSII quantum efficiencies.
- Taxon
- RiceOryza sativat0
- Treatment
- MeJAe0
- Outcome
- O3-inhibition of Fv/Fm and Fq′/Fm′ of PS IIe0
- Direction
- amelioratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MeJA ameliorated the O3-inhibition of Fv/Fm and Fq′/Fm′ of PS II.”
t0“Rice”
Claim · model-written summary
Methyl jasmonate accelerated recovery of ozone-inhibited net photosynthesis.
- Taxon
- RiceOryza sativat0
- Treatment
- MeJA applicatione0
- Outcome
- O3-inhibition of PNe0
- Direction
- Rapid recoverye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rapid recovery from O3-inhibition of PN was observed as a result of MeJA application”
t0“Rice”
Claim · model-written summary
Methyl jasmonate decreased net photosynthetic rate and stomatal conductance immediately after ozone exposure.
- Taxon
- RiceOryza sativat0
- Treatment
- MeJAe0
- Outcome
- PN and stomatal conductance (gs)e0
- Direction
- decreasede0
- Qualifier
- AE-0e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MeJA decreased the PN and stomatal conductance (gs) at AE-0.”
t0“Rice”
Claim · model-written summary
Ozone decreased total ascorbic acid content.
- Taxon
- RiceOryza sativat0
- Treatment
- O3e0
- Outcome
- total ascorbic acid contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The O3 decreased the total ascorbic acid content”
t0“Rice”
Claim · model-written summary
Methyl jasmonate increased total ascorbic acid content.
- Taxon
- RiceOryza sativat0
- Treatment
- MeJAe0
- Outcome
- total ascorbic acid contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The O3 decreased the total ascorbic acid content, although the MeJA increased it.”
t0“Rice”
Claim · model-written summary
Methyl jasmonate effects on ozone inhibition of PSII and ascorbic acid were smaller at C800 than C400.
- Taxon
- RiceOryza sativat0
- Treatment
- MeJAe0
- Outcome
- O3-inhibition of PSII and ascorbic acid contente0
- Direction
- less thane0
- Qualifier
- C800e0
- Comparator
- C400e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of MeJA on the O3-inhibition of PSII and ascorbic acid content at C800 were less than at C400.”
t0“Rice”
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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.