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THE PHOTOPHOBIC RESPONSE OF VARIOUS SULFUR AND NONSULFUR PURPLE BACTERIA
Author(s) -
Hustede E.,
Liebergesell M.,
Schlegel H. G.
Publication year - 1989
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.1751-1097.1989.tb02912.x
Subject(s) - rhodospirillum rubrum , chromatium , rhodospirillales , purple bacteria , bacteria , sulfur , biology , rhodospirillaceae , botany , chemistry , microbiology and biotechnology , photosynthesis , photosynthetic reaction centre , organic chemistry , genetics
— The photophobic response of 34 strains of nonsulfur and sulfur purple bacteria was examined with respect to response‐eliciting light intensities. The bacteria were grown in defined synthetic media or in Winogradsky columns. Two population methods based on Engelmann's light trap were used to determine the discrimination thresholds of the bacteria. A single‐side irradiation method allowed the estimation of approximate values, while the double‐side irradiation method provided more exact values of the discrimination threshold. Sixteen strains belonging to 9 different species exhibited discrimination thresholds between 0.7% and 2.6%. The motility of the other 18 strains proved to be insufficient to measure light sensitivities with the methods used. The effect of various environmental factors on the light sensitivies of Chromatium vinosum D and Rhodospirillum rubrum Ha was examined. The measurements and observations made in this work recommend strains of Rhodospirillum rubrum and Chromatium vinosum as model organisms for further studies.