Responses to ozone on Populus "Oxford" clone in an open top chamber experiment assessed before sunrise and in full sunlight

Desotgiu, Rosanna; Pollastrini, Martina; Cascio, Chiara; Gerosa, Giacomo; Marzuoli, Riccardo; Bussotti, Filippo

doi:10.1007/s11099-012-0074-y

Cited by 22 publications

(15 citation statements)

References 47 publications

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“…Higher differences between O 3 -treated and control plants in the maximum yield of primary photochemistry of PS II (φ Po =TR 0 /ABS) at predawn (dark conditions) was observed by Desotgiu et al (2013). In contrast, minor differences in the maximum yield of primary photochemistry of PS II were observed in our present study, showing that φ Po is the less sensitive parameter to the effect of O 3 and drought.…”

Section: Discussioncontrasting

confidence: 63%

The effect of ozone and drought on the photosynthetic performance of canola

Maliba

Michael

Berner

2018

Journal of Integrative Agriculture

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Canola plants were fumigated in open-top chambers with ozone (O 3) (120 ppb) under well-watered (WW) and water-stressed (WS) conditions for 4 weeks. Non-fumigated plants were also studied to facilitate comparison between treatments for the same week and over time. Therefore, the treatments were: WW, WW-O 3 , WS and WS-O 3. The fast chlorophyll a fluorescence transients OJIP for the four treatments emitted upon illumination of dark-adapted leaves were measured after week 1, 2, 3, 4 and analysed by the JIP-test to evaluate the resulting changes in photosynthetic performance. Ozone fumigation led to a decline of total performance index (PI total) in well-watered plants. The effect of O 3 was minor under drought conditions, as revealed by a decrease of PI total by 3%. The PI total decreased as the treatment was prolonged, due to leaf ageing for all cases and the decline was more pronounced under WW-O 3. Taking the average of all weeks, WW had the highest PI total and the lowest WW-O 3 (decrease by 27%), while in WS and WS-O 3 , it was lower than WW (14 and 17%, respectively). We found that the absorption (ABS)/reaction centre (RC) increases, while the maximum quantum yield of primary photochemistry (φ Po) undergoes slight changes, and trapping (TR 0)/RC closely followed the increase in ABS/RC. This indicates that O 3 and drought caused an increase in the functional antenna size. The maximum quantum yield of primary photochemistry showed slight differences for all treatments and over time, suggesting that this parameter is less sensitive to drought and O 3 stress. Therefore, the more sensitive components of the photosynthetic electron transport chain appeared to be the probability that an electron from the intersystem electron carriers is transferred to reduce end electron acceptors at the PSI acceptor side (δ Ro) and the RC density on a chlorophyll basis (RC/ABS).

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Section: Discussioncontrasting

confidence: 63%

The effect of ozone and drought on the photosynthetic performance of canola

Maliba

Michael

Berner

2018

Journal of Integrative Agriculture

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“…Such strategies also include a decrease in the quantum efficiency of primary photochemistry ( F V / F M ), caused by the activation of the xanthophyll cycle and damage to the D1 protein in the PSII RC. These protective processes (nonphotochemical de‐excitation pathways) are combined with an increase in electron transport beyond PSI (increasing values of the IP phase, Δ V IP (Cascio et al ., ; Desotgiu et al ., , ). At the southernmost Mediterranean sites, the depression of PI ABS may be attributed, alongside high solar radiation, to poor soils and dry climate (Peguero‐Pina et al ., ).…”

Section: Discussionmentioning

confidence: 99%

“…The measurements of ChlF were performed after 4–5 h of sample dark adaptation on 16 leaves for each tree. As sampling was performed at different hours in the day, a long dark adaptation period was necessary to reduce the effects of leaf photoinhibition and of the daily hours of solar radiation exposure (Desotgiu et al ., , ).…”

Section: Methodsmentioning

confidence: 99%

Taxonomic and ecological relevance of the chlorophyll a fluorescence signature of tree species in mixed European forests

et al. 2016

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The variability of chlorophyll a fluorescence (ChlF) parameters of forest tree species was investigated in 209 stands belonging to six European forests, from Mediterranean to boreal regions. The modifying role of environmental factors, forest structure and tree diversity (species richness and composition) on ChlF signature was analysed. At the European level, conifers showed higher potential performance than broadleaf species. Forests in central Europe performed better than those in Mediterranean and boreal regions. At the site level, homogeneous clusters of tree species were identified by means of a principal component analysis (PCA) of ChlF parameters. The discrimination of the clusters of species was influenced by their taxonomic position and ecological characteristics. The species richness influenced the tree ChlF properties in different ways depending on tree species and site. Tree species and site also affected the relationships between ChlF parameters and other plant functional traits (specific leaf area, leaf nitrogen content, light-saturated photosynthesis, wood density, leaf carbon isotope composition). The assessment of the photosynthetic properties of tree species, by means of ChlF parameters, in relation to their functional traits, is a relevant issue for studies in forest ecology. The connections of data from field surveys with remotely assessed parameters must be carefully explored.

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“…Chl a fluorescence as well as gasexchange measurements were recorded and ecophysiological traits of the plants were measured following standardized protocols (Pérez-Harguindeguy et al 2013). Fluorescence and gas-exchange measurements were not performed between 12:00 h and 14:00 h in order to avoid midday depressions (Demmig- Adams et al 1989, Lichtenthaler et al 2005, Desotgiu et al 2013.…”

Section: Methodsmentioning

confidence: 99%

Chlorophyll fluorescence and gas exchange measurements in field research: an ecological case study

2018

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We tested whether cheap and quick chlorophyll (Chl) fluorescence can be used in ecophysiological field studies as proxies for gas-exchange measurements. We measured net photosynthetic rate at saturating irradiance and ambient atmospheric CO 2 concentrations (P Nsat), maximum carboxylation rate (V cmax), maximum quantum yield of PSII (F v /F m), the performance index (PI abs), leaf nitrogen (N area), and carbon isotope discrimination (Δ 13 C) within four herbaceous species along two elevational gradients. We analysed the relationship between Chl fluorescence and gas-exchange parameters and their link to indirect assessment of plant performance via ecophysiological traits. F v /F m showed no relationship to P Nsat and only weak relationships to V cmax. PI abs was positively related to P Nsat and V cmax. PI abs , P Nsat , and V cmax were positively associated with N area and negatively to Δ 13 C, whereas F v /F m showed no relationship to N area and a positive to Δ 13 C. Thus, PI abs might be suitable to characterize the photosynthetic activity when aiming on large numbers of samples.

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Responses to ozone on Populus "Oxford" clone in an open top chamber experiment assessed before sunrise and in full sunlight

Cited by 22 publications

References 47 publications

The effect of ozone and drought on the photosynthetic performance of canola

The effect of ozone and drought on the photosynthetic performance of canola

Taxonomic and ecological relevance of the chlorophyll a fluorescence signature of tree species in mixed European forests

Chlorophyll fluorescence and gas exchange measurements in field research: an ecological case study

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