Interactive Effects Between Ozone and Drought: Sorrow or Joy?

Bohler, Sacha; Cuypers, Ann; Vangronsveld, Jaco

doi:10.1007/978-3-319-07899-1_7

Cited by 2 publications

(1 citation statement)

References 56 publications

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“…According to the results of Zhu et al (2016), canola is sensitive to drought during all stages of growth. The individual and combined effects of O 3 and drought exposure can be influenced by a number of other factors such as O 3 flux and antioxidant capacity, sensitivity to O 3 and drought, time of day and vegetative season (Bohler et al 2015). In the present study, particular parameters of Chl a fluorescence were used to determine the sensitivity of canola to elevated O 3 and drought and combinations of them on the photosynthetic performance.…”

Section: Introductionmentioning

confidence: 98%

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: Introductionmentioning

confidence: 98%

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

Maliba

Michael

Berner

2018

Journal of Integrative Agriculture

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Living in a Mediterranean city in 2050: broadleaf or evergreen ‘citizens’?

Cotrozzi

Remorini

Pellegrini

et al. 2017

Environ Sci Pollut Res

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The predicted effects of global change (GC) will be exacerbated in the more densely populated cities of the future, especially in the Mediterranean basin where some environmental cues, such as drought and tropospheric ozone (O) pollution, already mine seriously plant survival. Physiological and biochemical responses of a Mediterranean, evergreen, isohydric plant species (Quercus ilex) were compared to those of a sympatric, deciduous, anisohydric species (Q. pubescens) under severe drought (20% of the effective daily evapotranspiration) and/or chronic O exposure (80 ppb for 5 h day for 28 consecutive days) to test which one was more successful in those highly limiting conditions. Results show that (i) the lower reduction of total leaf biomass of Q. ilex as compared to Q. pubescens when subjected to drought and drought × O (on average -59 vs -70%, respectively); (ii) the steeper decline of photosynthesis found in Q. pubescens under drought (-87 vs -81%) and drought × O (-69 vs -59%, respectively); (iii) the increments of malondialdehyde (MDA) by-products found only in drought-stressed Q. pubescens; (iv) the impact of O, found only in Q. pubescens leaves and MDA, can be considered the best probes of the superiority of Q. ilex to counteract the effect of mild-severe drought and O stress. Also, an antagonistic effect was found when drought and O were applied simultaneously, as usually happens during typical Mediterranean summers. Our dataset suggests that on future, the urban greening should be wisely pondered on the ability of trees to cope the most impacting factors of GC, and in particular their simultaneity.

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Interactive Effects Between Ozone and Drought: Sorrow or Joy?

Cited by 2 publications

References 56 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

Living in a Mediterranean city in 2050: broadleaf or evergreen ‘citizens’?

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