Structural features and transcript-editing analysis of sugarcane (Saccharum officinarum L.) chloroplast genome
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The complete nucleotide sequence of the chloroplast genome of sugarcane (Saccharum officinarum) was determined. It consists of 141,182 base-pairs (bp), containing a pair of inverted repeat regions (IRA, IRB) of 22,794 bp each. The IRA and IRB sequences separate a small single copy region (12,546 bp) and a large single copy (83,048 bp) region. The gene content and relative arrangement of the 116 identified genes (82 peptide-encoding genes, four ribosomal RNA genes, 30 tRNA genes), with the 16 ycf genes, are highly similar to maize. Editing events, defined as C-to-U transitions in the mRNA sequences, were comparable with those observed in maize, rice and wheat. The conservation of gene organization and mRNA editing suggests a common ancestor for the sugarcane and maize plastomes. These data provide the basis for functional analysis of plastid genes and plastid metabolism within the Poaceae. The sugarcane chloroplast DNA sequence is available at GenBank under accession NC005878.
KeywordsSugarcane Chloroplast genome Grass plastome mRNA editing Genome comparative analysis
The authors gratefully acknowledge Eugênio Cesar Ulian and William Lee Burnquist (Copersucar Technology Center, Piracicaba, São Paulo, Brazil) for supplying the sugarcane commercial hybrid SP 80-3280, Ralph Bock, Stephanie Ruf and Martin Hager for suggestions on sugarcane plastid DNA isolation, the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for project grant 99/02860-8 and for fellowships granted to T.C.J. (99/02973-7) and D.M.C. (98/06206-8) and the Conselho Nacional de Pesquisa e Desenvolvimento (CNPq/PIBIC) for a fellowship granted to M.R.B. The authors declare that this work was carried out in compliance with the current laws governing genetic experimentation in Brazil.
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