Abstract
A comparative study on functional leaf treats and the diurnal dynamics of photosynthetic processes was conducted on 2-year-old potted plants of two grape (Vitis vinifera L.) varieties (Aleatico, ALE, and Trebbiano giallo, TRE), exposed under controlled conditions to realistic concentrations of the pollutant gas ozone (80 ppb for 5 h day(-1), 8:00-13:00 h, + 40 ppb for 5 h day(-1), 13:00-18:00 h). At constitutive levels, the morphological functional traits of TRE improved leaf resistance to gas exchange, suggesting that TRE is characterized by a potential high degree of tolerance to ozone. At the end of the treatment, both varieties showed typical visible injuries on fully expanded leaves and a marked alteration in the diurnal pattern of photosynthetic activity. This was mainly due to a decreased stomatal conductance (-27 and -29% in ALE and TRE, in terms of daily values in comparison to controls) and to a reduced mesophyllic functioning (+33 and +16% of the intercellular carbon dioxide concentration). Although the genotypic variability of grape regulates the response to oxidative stress, similar detoxification processes were activated, such as an increased content of total carotenoids (+64 and +30%, in ALE and TRE), enhanced efficiency of thermal energy dissipation within photosystem II (+32 and +20%) closely correlated with the increased de-epoxidation index (+26 and +22%) and variations in content of some osmolytes. In summary, we can conclude that: the daily photosynthetic performance of grapevine leaves was affected by a realistic exposure to ozone. In addition, the gas exchange and chlorophyll a fluorescence measurements revealed a different quali-quantitative response in the two varieties. The genotypic variability of V. vinifera and the functional leaf traits would seem to regulate the acclimatory response to oxidative stress and the degree of tolerance to ozone. Similar photoprotective mechanisms were activated in the two varieties, though to a different extent.
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Claims 15
Claim · model-written summary
Trebbiano giallo leaf traits suggested high ozone tolerance.
Verbatim
e0“the morphological functional traits of TRE improved leaf resistance to gas exchange, suggesting that TRE is characterized by a potential high degree of tolerance to ozone”
t0“Grapevine”
Claim · model-written summary
Ozone caused visible injuries on fully expanded leaves of both varieties.
Not reportedComparatorDirection
Verbatim
e0“both varieties showed typical visible injuries on fully expanded leaves and a marked alteration in the diurnal pattern of photosynthetic activity”
t0“Grapevine Varieties Towards Ozone”
Claim · model-written summary
Ozone altered diurnal photosynthetic activity in both varieties.
Not reportedComparatorDirection
Verbatim
e0“both varieties showed typical visible injuries on fully expanded leaves and a marked alteration in the diurnal pattern of photosynthetic activity”
t0“Grapevine Varieties Towards Ozone”
Claim · model-written summary
Aleatico stomatal conductance decreased 27% relative to controls.
Verbatim
e0“decreased stomatal conductance (-27 and -29% in ALE and TRE, in terms of daily values in comparison to controls)”
t0“Grapevine Varieties Towards Ozone”
Claim · model-written summary
Trebbiano stomatal conductance decreased 29% relative to controls.
Verbatim
e0“decreased stomatal conductance (-27 and -29% in ALE and TRE, in terms of daily values in comparison to controls)”
t0“Grapevine Varieties Towards Ozone”
Claim · model-written summary
Aleatico intercellular carbon dioxide concentration rose 33%.
- Taxon
- grapet0
- Material
- ALEe1
- Treatment
- ozonet0
- Outcome
- intercellular carbon dioxide concentratione0
- Direction
- increaseinferrede0
- Value
- +33e0
Not reportedComparator
Verbatim
e0“reduced mesophyllic functioning (+33 and +16% of the intercellular carbon dioxide concentration)”
t0“Grapevine Varieties Towards Ozone”
e1“varieties (Aleatico, ALE, and Trebbiano giallo, TRE)”
Claim · model-written summary
Trebbiano intercellular carbon dioxide concentration rose 16%.
- Taxon
- grapet0
- Material
- TREe1
- Treatment
- ozonet0
- Outcome
- intercellular carbon dioxide concentratione0
- Direction
- increaseinferrede0
- Value
- +16%e0
Not reportedComparator
Verbatim
e0“reduced mesophyllic functioning (+33 and +16% of the intercellular carbon dioxide concentration)”
t0“Grapevine Varieties Towards Ozone”
e1“varieties (Aleatico, ALE, and Trebbiano giallo, TRE)”
Claim · model-written summary
Aleatico total carotenoids increased 64%.
- Taxon
- grapet0
- Material
- ALEe0
- Treatment
- ozonet0
- Outcome
- content of total carotenoidse0
- Direction
- increasede0
- Value
- +64e0
Not reportedComparator
Verbatim
e0“increased content of total carotenoids (+64 and +30%, in ALE and TRE)”
t0“Grapevine Varieties Towards Ozone”
Claim · model-written summary
Trebbiano total carotenoids increased 30%.
- Taxon
- grapet0
- Material
- TREe0
- Treatment
- ozonet0
- Outcome
- content of total carotenoidse0
- Direction
- increasede0
- Value
- +30%e0
Not reportedComparator
Verbatim
e0“increased content of total carotenoids (+64 and +30%, in ALE and TRE)”
t0“Grapevine Varieties Towards Ozone”
Claim · model-written summary
Aleatico thermal energy dissipation efficiency increased 32%.
- Taxon
- grapet0
- Material
- ALEe1
- Treatment
- ozonet0
- Outcome
- efficiency of thermal energy dissipation within photosystem IIe0
- Direction
- enhancede0
- Value
- +32e0
Not reportedComparator
Verbatim
e0“enhanced efficiency of thermal energy dissipation within photosystem II (+32 and +20%)”
t0“Grapevine Varieties Towards Ozone”
e1“varieties (Aleatico, ALE, and Trebbiano giallo, TRE)”
Claim · model-written summary
Trebbiano thermal energy dissipation efficiency increased 20%.
- Taxon
- grapet0
- Material
- TREe1
- Treatment
- ozonet0
- Outcome
- efficiency of thermal energy dissipation within photosystem IIe0
- Direction
- enhancede0
- Value
- +20%e0
Not reportedComparator
Verbatim
e0“enhanced efficiency of thermal energy dissipation within photosystem II (+32 and +20%)”
t0“Grapevine Varieties Towards Ozone”
e1“varieties (Aleatico, ALE, and Trebbiano giallo, TRE)”
Claim · model-written summary
Aleatico de-epoxidation index increased 26%.
- Taxon
- grapet0
- Material
- ALEe1
- Treatment
- ozonet0
- Outcome
- de-epoxidation indexe0
- Direction
- increasede0
- Value
- +26e0
Not reportedComparator
Verbatim
e0“increased de-epoxidation index (+26 and +22%)”
t0“Grapevine Varieties Towards Ozone”
e1“varieties (Aleatico, ALE, and Trebbiano giallo, TRE)”
Claim · model-written summary
Trebbiano de-epoxidation index increased 22%.
- Taxon
- grapet0
- Material
- TREe1
- Treatment
- ozonet0
- Outcome
- de-epoxidation indexe0
- Direction
- increasede0
- Value
- +22%e0
Not reportedComparator
Verbatim
e0“increased de-epoxidation index (+26 and +22%)”
t0“Grapevine Varieties Towards Ozone”
e1“varieties (Aleatico, ALE, and Trebbiano giallo, TRE)”
Claim · model-written summary
Ozone exposure changed some grape osmolyte contents.
Not reportedComparatorDirection
Verbatim
e0“variations in content of some osmolytes”
t0“Grapevine Varieties Towards Ozone”
Claim · model-written summary
Grapevine varieties differed in gas exchange and chlorophyll fluorescence responses.
Not reportedDirection
Verbatim
e0“the gas exchange and chlorophyll a fluorescence measurements revealed a different quali-quantitative response in the two varieties”
t0“Grapevine Varieties Towards Ozone”
The same questions in other papers
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1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- 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.