Plasmodial pigmentation of the acellular slime mould Physarum polycephalum in relation to the irradiation period
1998
Rakoczy, L. (Polish Academy of Sciences, Krakow (Poland). Dept. of Plant Physiology)
Yellow plasmodia of the acellular slime mould Physarum polycephalum irradiated with white light of 70 u mol/sguare m.s fluence rate showed two distinct changes in their colour depending on the irradiation period: 1) depigmentation of plasmodia -within a short-therm exposure, and 2) plasmodia taking on an orange colour as a result of a long period of continous exposure to radiation. Photobleached plasmodia transferred to the dark resynthetized the pigments and slowly become yellowish and then regained their yellow colour. General features of these pigments were comparable to those isolated from non-irradiated organisms. The pigments isolated from plasmodia subjected to a long period of irradiation differed qualitatively from those produced in the dark grown cultures. The general features of these pigments point to their being of the carotenoid type
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