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Mutant of Rhodopseudomonas spheroides Unable to Grow Aerobically¹

^a Department of Biology, University of Oregon, Eugene, Oregon 97403

ABSTRACT

We isolated a mutant of Rhodopseudomonas spheroides that grows normally under photosynthetic conditions but is unable to grow exponentially under aerobic conditions. Photosynthetically grown cultures of the mutant increase in mass and cell number for about 10 hr after transfer to aerobic conditions. During this time, no heme pigments are synthesized and the Q(O₂) declines. In the mutant, synthesis of heme pigments is obligatorily coupled to synthesis of bacteriochlorophyll.

² Present address: Brown Engineering, Research Park, Huntsville, Ala. 35807.

¹ Taken from a thesis submitted by T. Wittenberg in partial fulfillment of the requirements for the Ph.D. degree in Biology, University of Oregon, 1970.