Effect of Blue Light on Metabolic Processes, Development and Movement in True Slime Molds

Rakoczy, L.

doi:10.1007/978-3-642-67648-2_52

Cited by 20 publications

(7 citation statements)

References 51 publications

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“…In addition, in a follow up study [48], they demonstrated that direct light exposure of slime moulds hinders the speed-accuracy trade-off that underlies their foraging decisions. Exposure to white and blue lights has been shown to interfere with cellular processes such as glucose metabolism, migration, growth, respiration and sporulation [53,63]. In our study, after a 24 h exposure to intermittent irradiation with blue and white lights, we noted that slime moulds exhibited a significant bleaching of their yellow-coloured plasmodium, which confirms a previous observation [64].…”

Section: Discussionsupporting

confidence: 91%

Stress signalling in acellular slime moulds and its detection by conspecifics

Briard

Goujarde

Bousquet

et al. 2020

Phil. Trans. R. Soc. B

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Unicellular organisms live in unpredictable environments. Therefore, they need to continuously assess environmental conditions and respond appropriately to survive and thrive. When subjected to rapid changes in their environment or to cellular damages, unicellular organisms such as bacteria exhibit strong physiological reactions called stress responses that can be sensed by conspecifics. The ability to detect and use stress-related cues released by conspecifics to acquire information about the environment constitutes an adaptive survival response by prompting the organism to avoid potential dangers. Here, we investigate stress signalling and its detection by conspecifics in a unicellular organism, Physarum polycephalum . Slime moulds were subjected to either biotic (i.e. nutritional) or abiotic (i.e. chemical and light) stressors or left undisturbed while they were exploring a homogeneous environment. Then, we observed the responses of slime moulds facing a choice between cues released by stressed clone mates and cues released by undisturbed ones. We found that slime moulds actively avoided environments previously explored by stressed clone mates. These results suggest that slime moulds, like bacteria or social amoeba, exhibit physiological responses to biotic and abiotic stresses that can be sensed by conspecifics. Our results establish slime moulds as a promising new model to investigate the use of social information in unicellular organisms. This article is part of the theme issue ‘Signal detection theory in recognition systems: from evolving models to experimental tests’.

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Section: Discussionsupporting

confidence: 91%

Stress signalling in acellular slime moulds and its detection by conspecifics

Briard

Goujarde

Bousquet

et al. 2020

Phil. Trans. R. Soc. B

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“…Pattern of the action spectra for the yellow plasmodia of Physarum polycephalum (data not shown) was similar to that of the albino strain reported here, indicating that the yellow pigments (Steffan et al, 1987) are not the photoreceptor for the avoidance reaction. Action spectra for negative phototaxis by Physarum nudum plasmodia to 30CL500 nm light (Bialczyk, 1979;Rakoczy, 1980) agree with ours. We have also confirmed the avoidance at near IR region Figure 3.…”

Section: Photoavoidance Of Plasmodia To 200-800 Nm Lightsupporting

confidence: 87%

ACTION SPECTRA FOR SUPEROXIDE GENERATION AND UV AND VISIBLE LIGHT PHOTOAVOIDANCE IN PLASMODIA OF Physarum polycephalum

Ueda

Mori

Nakagaki

et al. 1988

Photochem & Photobiology

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The initial photochemical process leading to photoavoidance by plasmodia of an albino strain of Physarum plasmodium was studied. Superoxide (O;), detected as superoxide dismutase (SOD)-inhibitable electron spin resonance (ESR) signal of a spin trap (tBN), was formed upon irradiation. The amount of 0; formed increased linearlj with log fluence rate above the threshold. The photoavoidance to radiation at wavelengths between 20&800 nm also showed the similar linear relationship in log fluence rate-response curves. Thresholds for photoavoidance and 0 ; generation agreed with each other and the action spectra showed peaks at about 260, 370. and 460 nm. Thus, active oxygen generated by photosensitization seems to trigger the UV and blue light photoavoidance.

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“…NAIR and ZABKA 1966). RAKOCZY (1980) reports changes of coloring of Physarum nudum plasmodia caused by illumination. This is due to synthesis of melanin and possibly other pigments besides carotenoids.…”

Section: Pigmentationmentioning

confidence: 99%