FIG. 4.

Infection dynamics of the spiroplasma during adult host aging before and after transfection from the D. hydei (hyd) strain TKB163 into the D. melanogaster (mel) strain Oregon-R (solid lines). In addition, the infection dynamics data of the male-killing spiroplasma NSRO and the non-male-killing spiroplasma NSRO-A in the same Oregon-R genetic background, taken from Anbutsu and Fukatsu (1), are superimposed (dashed lines). Infection titers of the spiroplasmas are shown by mean values and standard deviations in terms of symbiont dnaA gene copies per mg of host body weight. Sample sizes are given in parentheses. Note that the spiroplasma densities in the transfected D. melanogaster strain are shown up to 2 weeks after adult emergence because of the high mortality of the fly strain.