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The objective of this work was to determine the chromosome number and nuclear DNA content of five species of the genus Amaranthus , which commonly occur in Brazil. Metaphase chromosomes were obtained through the flame drying technique and stained with 5% Giemsa, and DNA content was determined by flow cytometry. 2n=32 chromosomes were observed in A. hybridus and 2n=34 in the other studied species, indicating the occurrence of descendant dysploidy. The nuclear DNA content ranged from 1.28 to 1.79 pg, and A. deflexus had the highest value.

Número cromossômico e conteúdo de DNA nuclear em espécies do gênero Amaranthus (Amaranthaceae)