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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Caracteriza??o e compara??o de genes expressos em ?pices meristem?ticos de cana-de-a??car cultivados em SP e RN

Medeiros, Amanda Larissa Marques de 31 August 2010 (has links)
Made available in DSpace on 2014-12-17T14:03:35Z (GMT). No. of bitstreams: 1 AmandaLMM_DISSERT.pdf: 1135135 bytes, checksum: 22f94cd634c60ab505070e7d4ae43900 (MD5) Previous issue date: 2010-08-31 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / In this work, we used sugarcane as a model due to its importance for sugar and ethanol production. Unlike the current plant models, sugarcane presents a complex genetics and an enormous allelic variation. Here, we report the analysis of SAGE libraries produced using the shoot apical meristem from contrasted genotypes by flowering induction (non-flowering vs. early-flowering varieties) grown under S?o Paulo state conditions. The expression pattern was analyzed using samples from S?o Paulo (SP) and Rio Grande do Norte (RN) states. These results showed that cDNAs identified by SAGE libraries had differential expression only in S?o Paulo state samples. Furthermore, the cDNA identified CYP (Citocrome P450) was chosen for in silico and genome characterization because it was found in SAGE libraries and subtractive libraries from samples from RN. Phylogenetic trees showed the relationship for these sequences. Furthermore, the qRT-PCR for CYP showed a potential role as flowering indutor for RN samples considering different isophorms. Considering the results present here, it can be consider that CYP gene may be used as molecular marker / A cana-de-a??car ? um modelo devido ? sua import?ncia na produ??o de ?lcool e a??car. Diferente de outras plantas modelo, ela apresenta um genoma complexo e muita varia??o al?lica. Foram analisadas as bibliotecas SAGE produzidas a partir de ?pices meristem?ticos de cana-de-a??car de gen?tipos tardio e precoce, quanto ao florescimento, cultivados no estado de S?o Paulo. A express?o destes cDNAs prospectados foi analisada usando amostras de S?o Paulo e do Rio Grande do Norte. Estes resultados mostraram que os genes apresentavam express?o diferencial apenas para os gen?tipos cultivados em S?o Paulo. Entretanto, o cDNA CYP (Citocromo P450), foi escolhido para uma an?lise in silico e caracteriza??o gen?tica por ter sido identificado tanto nas bibliotecas SAGE como em bibliotecas subtrativas realizadas com gen?tipos cultivados no Rio Grande do Norte. ?rvores filogen?ticas mostraram a rela??o evolutiva entre as sequ?ncias. Al?m disso, dados de qRT-PCR para CYP51 mostram um poss?vel papel indutor de flora??o nas condi??es do RN. Considerando os resultados apresentados, podemos inferir que o gene CYP51 pode ser utilizado como marcador molecular para o melhoramento cl?ssico

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