KARYOTYPE ANALYSIS AND DNA CONTENT IN 2 SPECIES OF ROOT APHIDS

In this paper we describe the karyotypes of two aphid species, Tetrane urella akinire and Anoecia nemoralis, found on the roots of Graminacee . Karyotype analysis in T. akinire have shown variations in chromosome number which are discussed in relation to the evolution of aphid kary otypes. Moreover, we estimated the DNA content in somatic cells of bot h species. Since emission values observed in mitotic plates of T. akin ire with 14-15-16 chromosomes were completely overlapping, we can conc lude that these karyotype variations are solely due to chromosome frag mentation.