Assessment of UV-B Stress by Chlorophyll Fluorescence Analysis

Tevini, Manfred; Grusemann, P.; Fieser, G.

doi:10.1007/978-94-009-2823-7_29

Cited by 17 publications

(6 citation statements)

References 10 publications

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“…However, even in the presence of higher levels of white light found in greenhouse and field studies, reductions in photosynthesis of up to 17% were reported in the UV-B sensitive soybean cultivar "Essex" when supplied with UV-B equivalent to a 16% ozone depletion Teramura, 1986b, 1987). Solar UV-B in field studies also reduced net photosynthesis in sunflower seedlings by about 15% when a 12% ozone depletion was simulated by using the new ozone technique (Tevini et al, 1988a). It is presently unknown whether photosynthesis is reduced in a fluencedependent manner.…”

Section: Photosynthesis and Transpirationmentioning

confidence: 99%

Uv‐b Effects on Terrestrial Plants

Tevini

Teramura

1989

Photochem & Photobiology

568

224

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DepartmentAbstract-The potential impacts of an increase in solar UV-B radiation reaching the Earth's surface due to stratospheric ozone depletion have been investigated by several research groups during the last 15 years. Much of this research has centered on the effects of plant growth and physiology undcr artificial UV-B irradiation supplied to plants in growth chambers or greenhouses. Since these artiticial sources do not precisely match the solar spectrum and due to the wavelength dependency of photobiological processes, weighting functions, based on action spectra for specific responses. have been developed to assess the biological effectiveness o f the irradiation sources and of predicted ozone depletion. Recent experiments have also utilized artificially produced ozonc cuvettes to filter natural solar radiation and simulate an environment of reduced UV-B for comparative purposes.Overall, the effectiveness of UV-B varies both among species and among cultivars of a given species. Sensitive plants often exhibit reduced growth (plant height, dry weight, leaf area, etc.), photosynthetic activity and flowering. Competitive interactions may also be altered indirectly by differential growth responses. Photosynthetic activity may be reduced by direct effects on photosynthetic enzymes, metabolic pathways or indirectly through effects on photosynthetic pigments or stomata1 function. The fluence response of these changes has yet to be clearly demonstrated in most cases. Plants sensitive to UV-B may also respond by accumulating UV-absorbing compounds in their outer tissue layers, which presumably protect sensitive targets from UV damage. Several key enzymes in the biosynthetic pathways of these compounds have been shown to be specifically induced by UV-B irradiation.Few studies have documented the effects of UV-B on total plant yield under field conditions. One notable exception is a 6-yr study with soybean demonstrating harvestable yield reductions under a simulated 25% ozone depletion. These effects are further modified by prevailing microclimatic conditions. Plants tend to be less sensitive to UV-B radiation under drought or mineral deficiency, while sensitivity increases under low levels of visible light. Further studies are needed to understand the mechanisms of UV-B effects and the interactions with present stresseb and future projected changes in the environment.

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Section: Photosynthesis and Transpirationmentioning

confidence: 99%

Uv‐b Effects on Terrestrial Plants

Tevini

Teramura

1989

Photochem & Photobiology

568

224

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“…The predominance of evidence present suggests that Photosystem II (PSII) is a primary site of UV-B radiation damage (e.g., Tevini et al 1988, Bornman 1989 with effects occasionally reported on Photosystem I (e.g., Brandle et al 1977, Van et al 1977). However, these latter studies generally utilized high UV-B fluences in combination with low PAR, which is an unlikely event in nature.…”

Section: Uv-b Radiation Effects On Photosynthesismentioning

confidence: 99%

Effects of UV-B radiation on photosynthesis and growth of terrestrial plants

1994

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The photosynthetic apparatus of some plant species appears to be well-protected from direct damage from UV-B radiation. Leaf optical properties of these species apparently minimizes exposure of sensitive targets to UV-B radiation. However, damage by UV-B radiation to Photosystem II and Rubisco has also been reported. Secondary effects of this damage may include reductions in photosynthetic capacity, RuBP regeneration and quantum yield. Furthermore, UV-B radiation may decrease the penetration of PAR, reduce photosynthetic and accessory pigments, impair stomatal function and alter canopy morphology, and thus indirectly retard photosynthetic carbon assimilation. Subsequently, UV-B radiation may limit productivity in many plant species. In addition to variability in sensitivity to UV-B radiation, the effects of UV-B radiation are further confounded by other environmental factors such as CO2, temperature, light and water or nutrient availability. Therefore, we need a better understanding of the mechanisms of tolerance to UV-B radiation and of the interaction between UV-B and other environmental factors in order to adequately assess the probable consequences of a change in solar radiation.

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“…In recent years, chlorophyll (Chl) fluorescence has become an increasingly useful means for determining the energy state of the photosynthetic apparatus (6, 17, 21,23, 29) of plants, particularly in studies on environmental influences such as adaptation to light, extremes of temperature, drought, exposure to chemical agents or UV-B radiation, and disease (2,9,16,18,26,27,28,31). This has been stimulated by improvements in methods for Chl fluorometry and our .…”

mentioning

confidence: 99%

Chlorophyll fluorescence analysis and imaging in plant stress and disease

Daley¹

1995

Canadian Journal of Plant Pathology

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Assessment of UV-B Stress by Chlorophyll Fluorescence Analysis

Cited by 17 publications

References 10 publications

Uv‐b Effects on Terrestrial Plants

Uv‐b Effects on Terrestrial Plants

Effects of UV-B radiation on photosynthesis and growth of terrestrial plants

Chlorophyll fluorescence analysis and imaging in plant stress and disease

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