The structural features and phylogenetic utility of the ITS in Ferulago W. Koch (Umbelliferae) genus
Özet
To identify important structural features in the intergenic sequences of ribosomal DNAs, the nucleotide sequence of the 18-28S rRNA intergene region was determined in Ferulago genus. During the pre-rRNA processing pathway the corrected and efficient excision of the internal transcribed spacers (ITS1 and ITS2) is a crucial step for the biogenesis of a active ribosomal subunits. The recognition elements located in ITS were conserved among Ferulago species. While a striking sequence homology was observed in the mature ribosomal sequences, the two internal transcribed spacer regions were found to be G+C rich. Some variations among ITS sequences of this genus is found among Ferulago species. © 2006 Asian Network for Scientific Information.