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lima_jjp_dr_botfca.pdf: 2807174 bytes, checksum: 00e8dea3c713cb320435c39d6d97bae6 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Le soja est l'une des plus importantes espèces de cultures d'huile utilisée aussi bien en nourriture que dans diverses gammes d'applications industrielles. C'est pourquoi produire des graines vigoureuses est un levier essentiel pour augmenter efficacement de la production de la récolte. La qualité de graine physiologiquement faible, qui est plus à même de se produire sous un environnement tropical, mène à un pauvre établissement des plantes ainsi qu'à une diminution du rendement. La longévité d'une graine est la capacité de celle-ci à survivre à la sécheresse durant de longues périodes et représente une caractéristique importante sur la qualité d'une graine. Ici, l'objectif était d'obtenir une idée sur les mécanismes en régulant l'acquisition progressive de la longévité. En utilisant le séquençage à haut-débit, ARN a été séquencé en sept différentes étapes durant l'acquisition de longévité, générant entre 14 et 38 millions de reads. Ces reads ont été alignés sur les modeles de gene de Glycine max Wm82.a2.v1. Les transcripts différentiellement exprimés (DET) sont corrélée avec l'augmentation de la longévité de la graine. L’analise d’enrichissement via GO de ces DET ont révélé une importante surreprésentation des termes associés à la réponse au stress et traitement et modification de l'ARN. Le processu biologique Photosynthèse était liée à une faible longévité des semences. HSF (heat shock factor) et plusieurs facteurs de transcription associés à la défense biotique (WRKY 3 et NLFX1) sont des gènes candidats dont putative rôle dans la longévité des graines et méritent une caractérisation plus poussée. Nous avons également effectué la détermination de la teneur en sucres solubles non réducteurs, et nous avons observé que l'accumulation de sucres solubles non réducteurs sont liés à l'acquisition de la longévité, mais seulement l’accumulation d’eux ne suffit pas à expliquer la croissance de la longevité. / Soja é uma das mais culturas oleaginosas usadas para alimentação animal e humana bem como para uma larga aplicação industrial. Dada a sua capacidade de fixar nitrogênio atmsférico, é fundamental para o desenvolvimento de uma agricultura sustentável. Produzir sementes altamente vigorosas é a chave para aumentar a eficiência da produção da cultura. Longevidade de semente é a capacidade de sobreviver no estado seco por períodos prolongados e representa uma importante característica de qualidade da semente. Nesta pesquisa o objetivo foi obter insights sobre processos moleculares que regulam a aquisição de longevidade em sementes de soja. Com o sequenciamento de nova geração da Illumina, o RNA foi sequenciado a partir de sete estágios diferentes durante a aquisição de longevidade, gerando entre 14 e 38 milhões de reads. Estes reads foram alinhados com os modelos de genes de Glycine max Wm82.a2.v1 preditos no genoma de soja. Transcritos diferencialmente expressos (DET) foram correlacionados com o aumento da longevidade. Análise de enriquecimento da ontologia do gene daqueles DET revelaram uma siginificante sobre representação de termos associados com resposta a estresse e processamento e modificação de RNA. Processo biológico fotossíntese foi relacionado à baixa longevidade. Heat Shock Factors (HSF) e vários fatores de transcrição associados com resposta a estresse biótico (WRKY e NFXL1) são genes candidatos com possíveis papéis na longevidade de semente e merecem uma caracterização. Também foi determinado o conteúdo de açúcares solúveis não redutores. Foi observado que o acúmulo desses açúcares estão relacionados à aquisição da longevidade, porém somente eles não são suficientes para explicar o ganho da longevidade. / Soybean is one of the most important oil crop species used for food and feed as well as a range of industrial applications. However, producing highly vigorous seeds is a key lever to increase crop production efficiency. Low physiological seed quality, which is more prone to occur under tropical environment, leads to poor stand establishment and decreased in yields. Seed longevity is the ability to survive the dry state for prolonged periods of time and represents an important trait for seed quality. Here, the objective was to obtain insights into the mechanisms regulating the progressive acquisition of longevity. Using Illumina high-throughput sequencing, RNA was sequenced from seven different stages during the acquisition of longevity, generating between 14 and 38 million of reads. These reads were aligned to the Glycine max Wm82.a2.v1 gene model. Differentially expressed transcripts (DET) were correlated with the increase in seed longevity. Transcriptome and GO enrichment analyses of these DET revealed a significant over-representation of terms associated with response to stress and RNA processing and modification. Photosynthesis biological process was related to low seed longevity. HSF and several TF associated with biotic defense (WRKY3 and NLFX1) are candidate genes whose putative role in seed longevity deserve further characterization. We also performed the determination of the content of non-reducing soluble sugars, and we observed that the accumulation of non-reducing soluble sugars are related to acquisition of longevity but only the accumulation of them is not enough to explain the increase in longevity.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/140140 |
| Date | 29 April 2016 |
| Creators | Lima, Juliana Joice Pereira [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Silva, Edvaldo Aparecido Amaral da [UNESP], Leprince, Olivier |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | English |
| Detected Language | French |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 600, 600 |
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