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- W2056727089 abstract "In this paper, we provide further information on the genome organisation of Haplopappus gracilis, one of the six angiosperms showing the lowest chromosome number, i.e. 2n = 4, by determining the nucleotide sequence of the intergenic spacer region of the ribosomal RNA genes and its cytological localization on metaphase chromosomes. DNA sequence analysis reveals the occurring of a product of 4,382 bp in length, characterised by the presence of four blocks of different repeated sequences. Our analysis also evidenced putative promoter regions with three transcription initiation sites for polymerase I, as previously reported in Artemisia absinthium, belonging to the same Asteraceae family. A fluorescent in situ hybridization with the intergenic spacer probe indicates the presence of rDNA genes only in the satellited chromosomes of H. gracilis; besides, differences in the signal intensity between homologous chromosomes were frequently observed, thus suggesting for these chromosome sites the presence of a variable number of rDNA gene copies, even if a divergent chromatin organisation in corresponding regions cannot be ruled out." @default.
- W2056727089 created "2016-06-24" @default.
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- W2056727089 date "2012-09-05" @default.
- W2056727089 modified "2023-09-25" @default.
- W2056727089 title "The intergenic spacer region of the rDNA in Haplopappus gracilis (Nutt.) Gray" @default.
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- W2056727089 doi "https://doi.org/10.1007/s00709-012-0441-3" @default.
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