Ribosomal RNA genes of Phaseolus coccineus. IV. Structure and comparative-analysis of the intergenic spacer: Possible involvement of some nucleotides in the transcription control of coding sequences - Sequence of the intergenic spacer of ribosomal ge

摘要

The sequence of the intergenic spacer (IGS) of Phaseolus coccineus is determined. The IGS contains three distinct regions: Region A, constant in length; Region B, heterogeneous in length among genes, including two very similar segments 162 and 177 bp long, repeated two and nine times respectively in the investigated clone; Region C, constant in length, comprising five islands. The putative promoters and the sites of termination, processing and methylation are detected by a comparison with other plant systems. [References: 10]