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Chromosome studies in southern Brazilian wheat pest aphids Sitobion avenae, Schizaphis graminum, and Methopolophium dirhodum (Homoptera: Aphididae)
Verónica E. Rubin de CelisI,III; Dirceu N. GassenII; Marisa C. Santos-ColaresI; Alice K. OliveiraI; Vera L.S. ValenteI
IDepartamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15053, 91501-970 Porto Alegre, RS, Brasil. Send correspondence to V.L.S.V.
IICentro Nacional de Pesquisa do Trigo, Empresa Brasileira de Pesquisa Agropecuária (CNPT-EMBRAPA), Caixa Postal 569, 99001-970 Passo Fundo, RS, Brasil.
IIIFacultad de Ciencias Biologicas, Laboratorio de Entomologia, Universidad Ricardo Palma, Casilla Postal 138, Lima 18, Lima, Peru.
ABSTRACT
We examined the chromosome set of the aphid species Sitobion avenae, Schizaphis graminum and Methopolophium dirhodum by means of conventional staining and C, NOR, AIuI and HaeIII banding methods. These species are considered important pests to several plants of economic interest in Brazil. No variation was observed in the number of chromosomes of S. avenae, whereas there was intrapecific variation in the other two species. Interspecific differences in the response to the banding treatments were observed. Whereas these techniques allowed the identification of several S. graminum chromosome pairs, only the AIuI treatment was capable of inducing differential staining in the M. dirhodum chromosomes and no clear patterns emerged when the S. avenae preparations were treated.
Keywords: wheat pest; aphids; Homoptera.
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