L. Baumann et al., ENDOSYMBIONTS (BUCHNERA) OF THE APHID UROLEUCON SONCHI CONTAIN PLASMIDS WITH TRPEG AND REMNANTS OF TRPE PSEUDOGENES, Current microbiology, 35(1), 1997, pp. 18-21
The aphid Uroleucon sonchi contains a prokaryotic endosymbiont (Buchne
ra) with plasmids having trpEG as well as remnants of trpE pseudogenes
. In this respect it resembles Buchnera from the aphid Diurcaphis noxi
a. Phylogenetic trees based on trpE (plasmid gene) and trpB (chromosom
al genes) from eight species of aphids are congruent, indicating a lac
k of exchange of plasmids among endosymbionts from different aphid spe
cies.