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PHOTOSTIMULATION OF AGGREGATION IN THE CELLULAR SLIME MOLD Polysphondylium violaceum
Author(s) -
Arnal Frank,
Recer Gregg,
Hanna Michael. H.
Publication year - 1984
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1984.tb04627.x
Subject(s) - photostimulation , darkness , light intensity , incubation , slime mold , biophysics , chemistry , biology , biochemistry , botany , optics , physics
Aggregation in Polysphondylium violaceum is stimulated by light with an increase in the number of aggregates being one effect of light incubation. An aggregation‐stimulating factor, D factor, has been shown previously to cause phenotypic reversal of the aggregation‐defect in aggA mutants. The phenotypic reversal caused by D factor is stimulated by light. The initial time after starvation is the sensitive period for the light‐stimulated increase in aggregate formation in wild type strains and also for light‐stimulated sensitivity to D factor. At low light intensities both blue and green light have the greatest effect on the number of aggregates formed. However, the intensity dependence of the response is weak over the range tested (0.2 to 10 μW/cm 2 ). Light also affects D factor causing as much as a 60‐fold decrease in production and a change in the proportion of the three active components of D factor when compared to D factor produced in darkness. Light affects a decrease in D factor production when it is present during development but only significantly affects the proportions of the D factor components if present prior to aggregation.