Abstract
This study was conducted to evaluate the role of ethylene in acute ozone (O3: 0, 0.1, and 0.3 cm3 m–3; O0, O0.1 and O0.3, respectively)-induced photosynthetic inhibition of paddy rice leaves grown under different atmospheric carbon dioxide concentrations (CO2: 400 and 800 cm3 m–3; C400 and C800, respectively). Ethephon and silver thiosulfate complex (STS) were applied one day before exposure to 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) the start of the exposure to O3. In the plants exposed to O3, visible leaf symptoms on the adaxial leaf surface appeared at AE-3. O3 decreased photosynthesis-related parameters, total ascorbic acid content, and redox state of ascorbic acid (RDS), and C800 ameliorated O3-induced damage. STS ameliorated the O3-induced visible leaf symptoms and O3-inhibition of photosynthesis but ethephon worsened slightly or did not affect them. Additionally, we evaluated the effects of O3 and CO2 on ethylene production in rice leaves. Although elevated CO2 did not affect ethylene production, exposure to O3 greatly increased ethylene production at AE-0 and rapidly reduced it at AE-1. These results indicate that ethylene is an important component of signal transduction for the extension of O3 injury in paddy rice.
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Claims 13
Claim · model-written summary
Ozone-exposed rice showed visible adaxial leaf symptoms at AE-3.
- Taxon
- Rice
Oryza sativat0 - Treatment
- O3e0
- Outcome
- visible leaf symptoms on the adaxial leaf surface appeared at AE-3e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the plants exposed to O3, visible leaf symptoms on the adaxial leaf surface appeared at AE-3.”
t0“Paddy Rice”
Claim · model-written summary
Ozone decreased photosynthesis-related parameters.
- Taxon
- RiceOryza sativat0
- Treatment
- O3e0
- Outcome
- photosynthesis-related parameterse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O3 decreased photosynthesis-related parameters, total ascorbic acid content, and redox state of ascorbic acid (RDS), and C800 ameliorated O3-induced damage.”
t0“Paddy 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“O3 decreased photosynthesis-related parameters, total ascorbic acid content, and redox state of ascorbic acid (RDS), and C800 ameliorated O3-induced damage.”
t0“Paddy Rice”
Claim · model-written summary
Ozone decreased redox state of ascorbic acid (RDS).
- Taxon
- RiceOryza sativat0
- Treatment
- O3e0
- Outcome
- redox state of ascorbic acid (RDS)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O3 decreased photosynthesis-related parameters, total ascorbic acid content, and redox state of ascorbic acid (RDS), and C800 ameliorated O3-induced damage.”
t0“Paddy Rice”
Claim · model-written summary
C800 ameliorated ozone-induced damage.
- Taxon
- RiceOryza sativat0
- Treatment
- C800e0
- Outcome
- O3-induced damagee0
- Direction
- amelioratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“O3 decreased photosynthesis-related parameters, total ascorbic acid content, and redox state of ascorbic acid (RDS), and C800 ameliorated O3-induced damage.”
t0“Paddy Rice”
Claim · model-written summary
STS ameliorated O3-induced visible leaf symptoms.
- Taxon
- RiceOryza sativat0
- Treatment
- STSe0
- Outcome
- O3-induced visible leaf symptomse0
- Direction
- amelioratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“STS ameliorated the O3-induced visible leaf symptoms and O3-inhibition of photosynthesis but ethephon worsened slightly or did not affect them.”
t0“Paddy Rice”
Claim · model-written summary
STS ameliorated O3-inhibition of photosynthesis.
- Taxon
- RiceOryza sativat0
- Treatment
- STSe0
- Outcome
- O3-inhibition of photosynthesise0
- Direction
- amelioratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“STS ameliorated the O3-induced visible leaf symptoms and O3-inhibition of photosynthesis but ethephon worsened slightly or did not affect them.”
t0“Paddy Rice”
Claim · model-written summary
ethephon worsened slightly or did not affect O3-induced visible leaf symptoms.
- Taxon
- RiceOryza sativat0
- Treatment
- ethephone0
- Outcome
- O3-induced visible leaf symptomse0
- Direction
- worsened slightly or did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“STS ameliorated the O3-induced visible leaf symptoms and O3-inhibition of photosynthesis but ethephon worsened slightly or did not affect them.”
t0“Paddy Rice”
Claim · model-written summary
ethephon worsened slightly or did not affect O3-inhibition of photosynthesis.
- Taxon
- RiceOryza sativat0
- Treatment
- ethephone0
- Outcome
- O3-inhibition of photosynthesise0
- Direction
- worsened slightly or did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“STS ameliorated the O3-induced visible leaf symptoms and O3-inhibition of photosynthesis but ethephon worsened slightly or did not affect them.”
t0“Paddy Rice”
Claim · model-written summary
Elevated CO2 did not affect rice leaf ethylene production.
- Taxon
- RiceOryza sativat0
- Treatment
- elevated CO2e0
- Outcome
- ethylene productione0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although elevated CO2 did not affect ethylene production, exposure to O3 greatly increased ethylene production at AE-0 and rapidly reduced it at AE-1.”
t0“Paddy Rice”
Claim · model-written summary
Ozone greatly increased ethylene production at AE-0.
- Taxon
- RiceOryza sativat0
- Treatment
- exposure to O3e0
- Outcome
- ethylene productione0
- Direction
- greatly increasede0
- Qualifier
- AE-0e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although elevated CO2 did not affect ethylene production, exposure to O3 greatly increased ethylene production at AE-0 and rapidly reduced it at AE-1.”
t0“Paddy Rice”
Claim · model-written summary
Ozone rapidly reduced ethylene production at AE-1.
- Taxon
- RiceOryza sativat0
- Treatment
- exposure to O3e0
- Outcome
- ethylene productione0
- Direction
- rapidly reducede0
- Qualifier
- AE-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although elevated CO2 did not affect ethylene production, exposure to O3 greatly increased ethylene production at AE-0 and rapidly reduced it at AE-1.”
t0“Paddy Rice”
Claim · model-written summary
Ethylene is implicated in signal transduction extending ozone injury in rice.
Verbatim
e0“These results indicate that ethylene is an important component of signal transduction for the extension of O3 injury in paddy rice.”
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