Distribution of a Ty3/gypsy-like retroelement on the A and B-chromosomes of Cestrum strigilatum Ruiz & Pav. and Cestrum intermedium Sendtn. (Solanaceae)

Genetics and Molecular Biology

Jéferson Nunes Fregonezi¹  Laurival A. Vilas-boas¹  Maria Helena Pelegrinelli Fungaro¹  Marcos Letaif Gaeta¹  André Luís Laforga Vanzela¹ 

[1] ,Universidade Estadual de Londrina Centro de Ciências Biológicas Departamento de Biologia GeralLondrina PR ,Brazil

关键词: Cestrum strigilatum;    Cestrum intermedium;    karyotype organization;    retroelements;    Solanaceae;    Ty3-gypsy;   

DOI  :  10.1590/S1415-47572007000400017

来源: SciELO

【 摘 要 】

Retroelements are a diversified fraction of eukaryotic genomes, with the Ty1/copia and Ty3/gypsy groups being very common in a large number of plant genomes. We isolated an internal segment of the Ty3/gypsy retroelement of Cestrum strigilatum (Solanaceae) using PCR amplification with degenerate primers for a conserved region of reverse transcriptase. The isolated segment (pCs12) was sequenced and showed similarity with Ty3/gypsy retroelements of monocotyledons and dicotyledons. This segment was used as probe in chromosomes of C. strigilatum and Cestrum intermedium. Diffuse hybridization signals were observed along the chromosomes and more accentuated terminal signals in some chromosome pairs, always associated with nucleolus organizer regions (NORs). The physical relationship between the hybridization sites of pCs12 and pTa71 ribosomal probes was assessed after sequential fluorescence in situ hybridization (FISH). Hybridization signals were also detected in the B chromosomes of these species, indicating an entail among the chromosomes of A complement and B-chromosomes.

【 授权许可】

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