Ozone-induced changes in CO2 assimilation, O2 evolution and chlorophyll a fluorescence transients in barley

Rowland-Bamford, A.J.; Coghlan, S.; Lea, Peter J.

doi:10.1016/0269-7491(89)90101-2

Cited by 16 publications

(3 citation statements)

References 21 publications

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“…The values determined for this 'residue' concentration are highly variable, ranging from nearly zero (Laiski et al 1989, Moldau et al 1990, Freer-Smith and Dobson 1989, Rowland-Bamford et al 1989, to low but not zero (Taylor et al 1982, Amiro et al 1984. The major problem seems to be accounting for ozone decomposition within the chamber and on the leaf (Rogers et al 1977).…”

Section: Gas Flow Responsementioning

confidence: 99%

Possible mechanisms for the inhibition of photosynthesis by ozone

Heath

1994

Photosynth Res

201

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Tropospheric ozone produced by industrial civilization is widespread. Although the levels are not clearly life threatening, they do have the potential to inhibit normal plant productivity, thought to be by an inhibition of photosynthesis. While the mechanism for this inhibition is not yet clear, there are several hypotheses for its cause. It is unlikely that ozone can penetrate the cell membrane unreacted; therefore, reactions at the plasma membrane either causing general ionic and metabolic disturbance within the cell or causing the production of unidentified toxic products must ultimately produce the alterations within the chloroplasts. While model systems, such as individual biochemicals, isolated chloroplasts, and algae, can give some understanding of possible reactions, they cannot provide the full story. One continuing controversy revolves about the role of stomata in the inhibition process-they play an important role, but the full interaction between stomatal closure and inhibition of photosynthesis has not yet emerged. In order to reach a political compromise on air quality standards, we need to have a good understanding of the fundamental mechanisms by which ozone causes any decline in plant productivity.

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Section: Gas Flow Responsementioning

confidence: 99%

Possible mechanisms for the inhibition of photosynthesis by ozone

Heath

1994

Photosynth Res

201

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“…imbalance across the plasmalemma rather than An initial study with a portable device (Schreiber effects within chloroplasts (Heath, Frederick & et al, 1987) showed that changes in prompt Chimiklis, 1982). Rowland-Bamford, Coghlan & fiuorescence under controlled laboratory conditions Lea (1989) have used a leaf disc oxygen electrode could predict Og-induced injury in bush beans at (Walker & Osmond, 1986) with Og-exposed barley least 20 h before visible signs of necrosis. The and recorded chlorophyll fiuorescence simulapparent portability of this equipment led many to taneously.…”

Section: Introductionmentioning

confidence: 99%

Chlorophyll fluorescence decay profiles of O₃‐exposed spruce needles as measured by time‐correlated single photon counting

1992

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SUMMARYChlorophyll fluorescence decay profiles have been measured in the wavelength range 680-720 nm for needles from Norway spruce [Picea abies (L.) Karst] trees which have been exposed to ozone. All profiles required three exponential components of lifetime 100-150 ps, 400-600 ps and 3-5-5-0 ns to fit the experimental data. Compared to control samples, the ozone-treated needles exhibited a greater amount of the longest-lived chlorophyll fluorescence and a redistribution in intensity for both the other components from 720+ to 690 nm. These observations are interpreted in terms of disruption of energy transfer and break-up of light-harvesting complexes on exposure to ozone. The potential for use of the technique in monitoring forest decline is discussed.

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“…experiments thus represents a compromise between Dylan (Black & Unsworth, 1979); and 12 days of O3 the need for adequate control of the gaseous exposure at 100 nl T^ (7 h d~^) significantly reduced environment and the modifications in plant microphotosynthesis in Hordeum vulgaris cv. Klaxon climate which occur when any form of chamber is (Rowland-Bamford, Coghlan & Lea, 1989).…”

Section: Introductionmentioning

confidence: 99%

The growth and development of Vicia faba L. in filtered and unfiltered open‐top chambers

Sanders

Clark

et al. 1990

New Phytologist

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SUMMARYThe response of Viciafaba cv. Ticol to ambient levels of air pollutants was investigated using open-top chambers (OTCs) venttlated with ambient air (NF treatments) and charcoal-filtered air (CF treatments). The OTCs were placed over a conventionally drilled crop shortly after emergence in April 1988, and remained in place until after the crop was harvested m September 1988. The daily mean pollutant concentrations were 15, 7, 6 and 9 nl T^ for O3, SO2, NO and NO2 respectively inside NF OTCs, and 6, 3, 8 and 5 nl V^ respectively for CF OTCs. These pollutant levels were accompanied hy changes in both the vegetative and the reproductive development of V.faba.The upper leaves of plants growing in CF air expanded to larger areas than corresponding leaves on NF plants, and the canopy of CF plants intercepted more radiation than that of NF plants. At flowering, CF plants had 11 % more flowers than NF plants. This diflFerence was maintained during early pod development and was caused hy greater retention of pods on the upper racemes of CF plants. As the pods dried however, more pods were abscised from CF plants than from NF plants, and by harvest the numher of pods per plant was comparable for the two treatments. Thus the observed diflFerences in growtb and development were transient and did not result in differences in flnal yield.

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Ozone-induced changes in CO2 assimilation, O2 evolution and chlorophyll a fluorescence transients in barley

Cited by 16 publications

References 21 publications

Possible mechanisms for the inhibition of photosynthesis by ozone

Possible mechanisms for the inhibition of photosynthesis by ozone

Chlorophyll fluorescence decay profiles of O₃‐exposed spruce needles as measured by time‐correlated single photon counting

The growth and development of Vicia faba L. in filtered and unfiltered open‐top chambers

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Ozone-induced changes in CO2 assimilation, O2 evolution and chlorophyll a fluorescence transients in barley

Cited by 16 publications

References 21 publications

Possible mechanisms for the inhibition of photosynthesis by ozone

Possible mechanisms for the inhibition of photosynthesis by ozone

Chlorophyll fluorescence decay profiles of O3‐exposed spruce needles as measured by time‐correlated single photon counting

The growth and development of Vicia faba L. in filtered and unfiltered open‐top chambers

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Chlorophyll fluorescence decay profiles of O₃‐exposed spruce needles as measured by time‐correlated single photon counting