Data/hora: 19/06/2024 12:03:21

Biblioteca(s): | Embrapa Agricultura Digital.
Data corrente: | 21/11/2012
Data da última atualização: | 08/01/2020
Autoria: | FIGUEIRA, T. R. e S.; OKURA, V.; SILVA, F. R. da; SILVA, M. J. da; KUDRNA, D.; AMMIRAJU, J. S. S.; TALAG, J.; WING, R.; ARRUDA, P.
Afiliação: | THAIS REZENDE E SILVA FIGUEIRA, Unicamp; VAGNER OKURA, Unicamp; FELIPE RODRIGUES DA SILVA, CNPTIA; MARCIO JOSE DA SILVA, Unicamp; DAVE KUDRNA; JETTY S. S. AMMIRAJU; JAYSON TALAG; ROD WING; PAULO ARRUDA, Unicamp.
Título: | A BAC library of the SP80-3280 sugarcane variety (saccharum sp.) and its inferred microsynteny with the sorghum genome.
Ano de publicação: | 2012
Fonte/Imprenta: | BMC Research Notes, v. 5, 2012.
Páginas: | 11 p.
DOI: | 10.1186/1756-0500-5-185
Idioma: | Inglês
Conteúdo: | Background: Sugarcane breeding has significantly progressed in the last 30 years, but achieving additional yield gains has been difficult because of the constraints imposed by the complex ploidy of this crop. Sugarcane cultivars are interspecific hybrids between Saccharum officinarum and Saccharum spontaneum. S. officinarum is an octoploid with 2n = 80 chromosomes while S. spontaneum has 2n = 40 to 128 chromosomes and ploidy varying from 5 to 16The hybrid genome is composed of 70-80% S. officinaram and 5-20% S. spontaneum chromosomes and a small proportion of recombinants. Sequencing the genome of this complex crop may help identify useful genes, either per se or through comparative genomics using closely related grasses. The construction and sequencing of a bacterial artificial chromosome (BAC) library of an elite commercial variety of sugarcane could help assembly the sugarcane genome. Results: A BAC library designated SS_SBa was constructed with DNA isolated from the commercial sugarcane variety SP80-3280. The library contains 36,864 clones with an average insert size of 125 Kb, 88% of which has inserts larger than 90 Kb. Based on the estimated genome size of 760?930 Mb, the library exhibits 5?6 times coverage the monoploid sugarcane genome. Bidirectional BAC end sequencing (BESs) from a random sample of 192 BAC clones sampled genes and repetitive elements of the sugarcane genome. Forty-five per cent of the total BES nucleotides represents repetitive elements, 83% of which belonging to LTR retrotransposons. Alignment of BESs corresponding to 42 BACs to the genome sequence of the 10 sorghum chromosomes revealed regions of microsynteny, with expansions and contractions of sorghum genome regions relative to the sugarcane BAC clones. In general, the sampled sorghum genome regions presented an average 29% expansion in relation to the sugarcane syntenic BACs. Conclusion: The SS_SBa BAC library represents a new resource for sugarcane genome sequencing. An analysis of insert size, genome coverage and orthologous alignment with the sorghum genome revealed that the library presents whole genome coverage. The comparison of syntenic regions of the sorghum genome to 42 SS_SBa BES pairs revealed that the sorghum genome is expanded in relation to the sugarcane genome.
Palavras-Chave: | Genoma da cana-de-açúcar.
Thesagro: | Sorgo.
Thesaurus Nal: | Genome; Saccharum; Sugarcane.
Categoria do assunto: | --
Registro original: | Embrapa Agricultura Digital (CNPTIA)
Exemplares: | CNPTIA - (16934-1) - UPC - AP - DD -  -  -  - DIS