|
Résumé :
|
Genetic variation was assessed for thr closely related aphids Myzus nicotianae Blackman and Myzus persicae (Sulzer), previously classified as a single species. Populations of both red and green color morphs, collected from tobacco and nontobacco hosts from 3 continents, were analyzed via random amplified polymorphic DNA (RAPD)-polymerase chain reaction (PCR) and mitochondrial cytochrome oxidase II (COII) and elongation factor-1 alpha (EF-1 alpha) gene sequencing. Three other Myzus species-M, cerasi (F.), M. hemerocallis Takahashi, and M, varians Davidson) -were used as outgroups in our analyses. RAPD-PCR analysis revealed man), easily detectable genetic polymorphisms between the My-us persicae complex and the outgroup species. The small number of polymorphisms detected within the complex were not col related with hose plant or the geographic origin of populations. The: sequences of both COII and EF-1 alpha for all populations within the M. persicae complex were identical, although significant variation was evident between the M. persicae complex anti outgroup taxa. These results strongly suggest the synonymy of M. persicae and M. nicotianae.
|
