Abstract
Two different genotypes of Lycopersicon esculentum Mill. (cv. Cuor di Bue, O3-sensitive and line 93.1033/1, O3-resistant) were treated with a single dose of ozone (150 mm3 m-3 for 3 h). The PS 2 activity was examined by measurements of chlorophyll a fluorescence on symptomatic and asymptomatic leaves. Symptoms were evident on the 4th leaves from the bottom, in both genotypes, while the 2nd leaves of the line 93.1033/1 were asymptomatic. In these leaves, the net photosynthetic rate (PN) did not change even if the Fv/Fm ratio significantly decreased. A strong reduction in PN, mostly due to the stomatal closure, was observed in Cuor di Bue. The non photochemical quenching coefficient (qNP) and the degree of PS 2 reaction centres closure (1-qP) were higher, while the quantum efficiency of PS 2 photochemistry (ΦPS2) and quantum efficiency of excitation energy capture (Φexc.) were lower in O3 treated leaves of both genotypes. The limitation of photosynthesis was shown also by a decrease in the parameter %P, which diminished compared to controls in both genotypes. The response of the two genotypes for the energy fraction dissipated as thermal energy in the PS 2 antennae (%D) was similar. The fraction of %P remained lower during the recovery in symptomatic leaves of the resistant line as compared to the controls, whereas %X, which represents the amount of light energy that is not utilized in photochemistry or dissipated in the PS 2 antennae, significantly rose in the asymptomatic leaves of this line and in both the leaves of Cuor di Bue. From data obtained we concluded that ozone affected the plants independently on the appearance of visible symptoms of injury because the leaves without visible symptoms of both the genotypes were negatively influenced.
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Claims 11
Claim · model-written summary
Ozone caused visible symptoms on fourth leaves in both genotypes.
- Taxon
- tomato
Solanum lycopersicumt0 - Material
- both genotypese0
- Organ / stage
- 4th leaves from the bottome0
- Outcome
- Symptoms were evidente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symptoms were evident on the 4th leaves from the bottom, in both genotypes, while the 2nd leaves of the line 93.1033/1 were asymptomatic.”
t0“two tomato genotypes”
Claim · model-written summary
Second leaves of resistant line 93.1033/1 remained asymptomatic.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- line 93.1033/1e0
- Organ / stage
- 2nd leavese0
- Outcome
- asymptomatice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symptoms were evident on the 4th leaves from the bottom, in both genotypes, while the 2nd leaves of the line 93.1033/1 were asymptomatic.”
t0“two tomato genotypes”
Claim · model-written summary
Net photosynthetic rate did not change in the asymptomatic leaves.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- these leavese0
- Outcome
- net photosynthetic rate (PN)e0
- Direction
- did not changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In these leaves, the net photosynthetic rate (PN) did not change even if the Fv/Fm ratio significantly decreased.”
t0“two tomato genotypes”
Claim · model-written summary
Fv/Fm decreased significantly in asymptomatic leaves.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- these leavese0
- Outcome
- Fv/Fm ratioe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In these leaves, the net photosynthetic rate (PN) did not change even if the Fv/Fm ratio significantly decreased.”
t0“two tomato genotypes”
Claim · model-written summary
Net photosynthetic rate decreased strongly in Cuor di Bue, mostly due to stomatal closure.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- Cuor di Buee0
- Outcome
- PNe0
- Direction
- reductione0
- Qualifier
- mostly due to the stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A strong reduction in PN, mostly due to the stomatal closure, was observed in Cuor di Bue.”
t0“two tomato genotypes”
Claim · model-written summary
Ozone increased qNP and reaction centre closure in both genotypes.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- O3e0
- Outcome
- non photochemical quenching coefficient (qNP) and the degree of PS 2 reaction centres closure (1-qP)e0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The non photochemical quenching coefficient (qNP) and the degree of PS 2 reaction centres closure (1-qP) were higher, while the quantum efficiency of PS 2 photochemistry (ΦPS2) and quantum efficiency of excitation energy capture (Φexc.) were lower in O3 treated leaves of both genotypes.”
t0“two tomato genotypes”
Claim · model-written summary
Ozone decreased both PS2 photochemical efficiencies in both genotypes.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- O3e0
- Outcome
- quantum efficiency of PS 2 photochemistry (ΦPS2) and quantum efficiency of excitation energy capture (Φexc.)e0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The non photochemical quenching coefficient (qNP) and the degree of PS 2 reaction centres closure (1-qP) were higher, while the quantum efficiency of PS 2 photochemistry (ΦPS2) and quantum efficiency of excitation energy capture (Φexc.) were lower in O3 treated leaves of both genotypes.”
t0“two tomato genotypes”
Claim · model-written summary
Ozone decreased %P relative to controls in both genotypes.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- %Pe0
- Direction
- decreasee0
- Comparator
- controlse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The limitation of photosynthesis was shown also by a decrease in the parameter %P, which diminished compared to controls in both genotypes.”
t0“two tomato genotypes”
Claim · model-written summary
The genotypes had similar responses for thermal energy dissipation in PS2 antennae.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- energy fraction dissipated as thermal energy in the PS 2 antennae (%D)e0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response of the two genotypes for the energy fraction dissipated as thermal energy in the PS 2 antennae (%D) was similar.”
t0“two tomato genotypes”
Claim · model-written summary
%P remained lower during recovery in symptomatic leaves of the resistant line than controls.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- symptomatic leavese0
- Outcome
- %Pe0
- Direction
- lowere0
- Qualifier
- during the recoverye0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fraction of %P remained lower during the recovery in symptomatic leaves of the resistant line as compared to the controls, whereas %X, which represents the amount of light energy that is not utilized in photochemistry or dissipated in the PS 2 antennae, significantly rose in the asymptomatic leaves of this line and in both the leaves of Cuor di Bue.”
t0“two tomato genotypes”
Claim · model-written summary
%X rose significantly in asymptomatic leaves of the resistant line and both leaves of Cuor di Bue.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- asymptomatic leavese0
- Outcome
- %Xe0
- Direction
- rosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fraction of %P remained lower during the recovery in symptomatic leaves of the resistant line as compared to the controls, whereas %X, which represents the amount of light energy that is not utilized in photochemistry or dissipated in the PS 2 antennae, significantly rose in the asymptomatic leaves of this line and in both the leaves of Cuor di Bue.”
t0“two tomato genotypes”
The same questions in other papers
ozone · physiology: photosynthesis · Solanum lycopersicum (tomato)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.