Photosensory behavior in procaryotes.

Häder, Donat‐P.

doi:10.1128/mmbr.51.1.1-21.1987

Cited by 89 publications

(61 citation statements)

References 154 publications

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“…Placement of a physical barrier, whether plastic, glass, or fabric, between biological communities and their natural light source will potentially modify a variety of natural processes. Photosynthesis, pigmentation, stomatal function, canopy morphology, diurnal periodicity, and photosensory behaviour may all be disrupted (Hader 1987;Caldwell et al 1989;Teramura & Sullivan 1994). How severe this effect is, and whether it can be separated from other treatment influences, depends upon the experimental design and the biological response being studied.…”

Section: Light Intensity and Spectramentioning

confidence: 99%

Simulated climate change: are passive greenhouses a valid microcosm for testing the biological effects of environmental perturbations?

Kennedy

1995

Global Change Biology

120

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This paper considers the use of passive greenhouse apparatus in field experiments investigating the biological consequences of climate change. The literature contains many accounts of such experiments claiming relevance of greenhouse treatment effects to global change scenarios. However, inadequacies in microclimate monitoring, together with incomplete understanding of greenhouse modes of action, cast doubt upon such claims. Here, treatment effects upon temperature (magnitude, range, variation, rates of change), moisture (humidity, precipitation, soil water content), light (intensity, spectral distribution), gas composition, snow cover, and wind speed are reviewed in the context of Intergovernmental Panel on Climate Change (IPCC) predictions. It is revealed that greenhouses modify each of these potentially limiting factors in a complex and interactive manner, but that the relationship between this modification and forecast conditions of climate change is poor. Interpretation of biological responses, and their extrapolation to predictive models, is thus unreliable. In order that future greenhouse experiments may overcome criticisms of artefact and lack of rigour, two amendments to methodology are proposed: (1) objective‐orientated design of greenhouse apparatus (2) multiple controls addressing individual environmental factors. The importance of a priori testing of microclimate treatment effects is stressed.

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Section: Light Intensity and Spectramentioning

confidence: 99%

Simulated climate change: are passive greenhouses a valid microcosm for testing the biological effects of environmental perturbations?

Kennedy

1995

Global Change Biology

120

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“…Light-dependent motility (photomovements) is one of such adaptive ability by which they can migrate into or stay in places having their favorite light conditions. ¶Posted on the website on 29 Cyanobacteria show three major types of photomovements: photokinesis, photophobic response and phototaxis (1,2). Photokinesis is a response in which the steady-state speed of the organism is governed by light fluence rate, independently of the light direction.…”

Section: Introductionmentioning

confidence: 99%

Equal-quantum Action Spectra Indicate Fluence-rate–selective Action of Multiple Photoreceptors for Photomovement of the Thermophilic Cyanobacterium Synechococcus elongatus¶

Kondou

Nakazawa²,

Higashi

et al. 2001

Photochem Photobiol

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Unicellular thermophilic cyanobacterium Synechococcus elongatus displayed phototaxis on agar plate at 55 degrees C. Equal-quantum action spectra for phototactic migration were determined at various fluence rates using the Okazaki Large Spectrograph as the light source. The shapes of the action spectra drastically changed depending on the fluence rate of the unilateral monochromatic irradiation: at a low fluence rate (3 mumol/m2/s), only lights in the red region had significant effect; at a medium fluence rate (10 mumol/m2/s), four major action peaks were observed at 530 nm (green), 570 nm (yellow), 640 nm (red) and 680 nm (red). At high fluence rates (30-90 mumol/m2/s), the former two peaks remained, while red peaks at 640 nm and 680 nm disappeared and, interestingly, an action peak around 700-740 nm (far-red) newly appeared. These results indicate that two or more distinct photoreceptors are involved in the phototaxis and that suitable photoreceptors are selectively active in response to the stimulus of light fluence rates. Far-red or red background lights irradiated vertically from above drastically inhibited phototaxis toward red light or far-red light, respectively. These results indicate involvement of some phytochrome(s).

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“…The early, predominantly negative results of phototaxis experiments with photosynthetic bacteria gradually took on the character of a dictum asserting that such bacteria were either incapable of phototaxis or at best, that occurrence of phototaxis in the bacteria was questionable (for example, see refs. [18,19]). The much-delayed discovery of phototaxis in purple bacteria reminds one of early views on the occurrence of cytochromes in anaerobes.…”

Section: Discussionmentioning

confidence: 99%

Phototaxis and other sensory phenomena in purple photosynthetic bacteria

Gest¹

1995

FEMS Microbiology Reviews

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The mechanisms employed by purple photosynthetic bacteria to convert light to utilizable chemical energy have been a major focus of research over the past 50 years. Utilization of light by photosynthetic bacteria for other purposes, however, has received relatively little attention. The recent discovery of phototaxis by Rhodospirillum centenum provides new opportunities for biochemical and molecular biological analysis of sensory processes in purple bacteria.

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Photosensory behavior in procaryotes.

Cited by 89 publications

References 154 publications

Simulated climate change: are passive greenhouses a valid microcosm for testing the biological effects of environmental perturbations?

Simulated climate change: are passive greenhouses a valid microcosm for testing the biological effects of environmental perturbations?

Equal-quantum Action Spectra Indicate Fluence-rate–selective Action of Multiple Photoreceptors for Photomovement of the Thermophilic Cyanobacterium Synechococcus elongatus¶

Phototaxis and other sensory phenomena in purple photosynthetic bacteria

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