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Applied and Environmental Microbiology, July 2004, p. 4096-4102, Vol. 70, No. 7
0099-2240/04/$08.00+0 DOI: 10.1128/AEM.70.7.4096-4102.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
Bert Hölldobler,2 Roy Gross,1 and Evelyn Zientz1*
Lehrstuhl für Mikrobiologie,1 Lehrstuhl für Verhaltensphysiologie und Soziobiologie, Biozentrum, Universität Würzburg, D-97074 Würzburg, Germany2
Received 6 November 2003/ Accepted 19 March 2004
The dynamics of replication of the intracellular endosymbiotic bacterium Blochmannia floridanus was determined during the larval development of its host ant Camponotus floridanus by real-time quantitative PCR. The bacteria were found to proliferate during pupation and immediately after the eclosion of the imagines (adult ants). In older workers the number of bacteria present in the midgut bacteriocytes decreased significantly. In contrast, the bacterial population in the ovaries was dependent on the reproductive state of the animal. An age-dependent degeneration of the midgut bacteriocytes was also investigated by microscopic techniques in males and female castes of the closely related ant species C. herculeanus and C. sericeiventris, respectively, with similar results and supports the concept of age-dependent degeneration of the midgut bacteriocytes in all castes.
Present address: Max Planck Institute of Molecular Plant Physiology, D-14476 Golm, Germany.
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