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Previous issue date: 2017-02-22 / CAPES / Faperj / CNPq / Among the abiotic stress, drought is a major environmental stress seriously limiting plant growth and crop productivity. Rice is one of the most important staple food crops in the world and requires a larger quantity of water to produce, once it is a crop extremely sensitive to drought stress. For this reason, to obtain rice plants that cope with drought stress without major reduction in productivity is the challenge for breeding programs nowadays. This work aimed: (i) identify upland rice varieties with contrasting drought tolerance through the evaluation of morphological and physiological traits, (ii) analyse root parameters which could explain the differences between tolerant and sensitive varieties to the drought stress and, (iii) identify new biotechnological targets related with the tolerance through transcript profile analysis in the contrasting varieties. Six experiments were performed, two in greenhouse and four in growth chamber conditions. The experimental design adopted was completely randomized. The first experiment started with ten rice varieties submitted to control and stress conditions during the reproductive stage. The contrasting varieties were selected based on morphological and physiological traits. Experiments from II to IV aimed to correlate the tolerance to the drought stress with the root development and morphology. Experiment V aimed to evaluate the regulation of genes related to the drought tolerance and the experiment VI aimed to analyse the differential expression of genes through the RNAseq analysis in rice roots. Data obtained from the productivity components, tolerance index and multivariate analysis through the evaluation of morphological and physiological traits allowed to identify Catet?o and Piau? variety as the most tolerant and Quebra Cacho and Mira as the most sensitive. Drought tolerance was correlated with a lower root angle and increase in the root density and emission of lateral roots by Catet?o variety during drought stress. Moreover, Catet?o variety has showed higher expression levels and early induction of genes and transcription factors related with drought tolerance. The RNAseq analysis allowed to identify several potential genes which can be used in future breeding programs aimimg the improvement of drought tolerance in rice. / Dentre os estresses abi?ticos que podem limitar o crescimento das culturas agr?colas, a seca ? considerada um dos principais, sendo capaz de reduzir consideravelmente a produ??o global de alimentos. O arroz ? uma das mais importantes culturas agr?colas do mundo e sua produ??o demanda grande quantidade de ?gua, pois ? uma esp?cie extremamente sens?vel ao d?ficit h?drico. Portanto, a obten??o de plantas de arroz que lidam com o estresse h?drico, sem redu??o significativa de produtividade ? um desafio para os programas de melhoramento atuais. Este trabalho teve como objetivos: (i) identificar variedades de arroz de sequeiro contrastantes quanto ? toler?ncia ao estresse h?drico por meio da avalia??o de caracter?sticas morfol?gicas e fisiol?gicas, (ii) analisar par?metros radiculares que possam explicar a diferen?a entre variedades tolerantes e sens?veis ao estresse h?drico e, (iii) identificar novos alvos biotecnol?gicos envolvidos com essa toler?ncia por meio da an?lise do perfil de transcritos nas variedades de arroz contrastantes. Foram realizados seis experimentos, sendo dois em casa de vegeta??o e quatro em c?mara de crescimento. O delineamento experimental utilizado foi o inteiramente casualizado. O primeiro experimento iniciou com dez variedades de arroz submetidas a condi??o controle e estresse h?drico durante o per?odo reprodutivo. As variedades contrastantes foram selecionadas com base em caracter?sticas morfol?gicas e fisiol?gicas analisadas. Os experimentos II a IV foram realizados a fim de correlacionar a toler?ncia ao estresse com o desenvolvimento e morfologia do sistema radicular. O experimento V foi realizado para avaliar a regula??o de genes relacionados a toler?ncia ao estresse h?drico e o experimento VI teve como objetivo analisar a express?o diferencial de genes por meio da t?cnica de RNA-seq em ra?zes de arroz. Os dados obtidos dos componentes de produtividade, ?ndices de toler?ncia ao estresse e an?lise multivariada das caracter?sticas morfol?gicas e fisiol?gicas permitiram identificar as variedades Catet?o e Piau? como as mais tolerantes ao estresse h?drico, e Quebra Cacho e Mira como as mais sens?veis. Foi observado que a toler?ncia ao estresse h?drico est? correlacionada com o menor ?ngulo radicular, aumento da densidade e emiss?o de ra?zes laterais em condi??es de d?ficit h?drico na variedade Catet?o. Al?m disso, essa variedade mostra indu??o r?pida e elevados n?veis de express?o de genes e fatores de transcri??o relacionados ? toler?ncia ao estresse h?drico em arroz. Por meio do sequenciamento do RNA foi poss?vel identificar diversos genes com potencial para serem utilizados em programas de melhoramento visando o aumento da toler?ncia ao estresse h?drico em arroz.
| Identifer | oai:union.ndltd.org:IBICT/oai:localhost:jspui/2173 |
| Date | 22 February 2017 |
| Creators | FERREIRA, Leandro Martins |
| Contributors | Santos, Leandro Azevedo, Souza, Sonia Regina de, Santos, Leandro Azevedo, Santos, Andr? Marques dos, Rossiello, Roberto Oscar Pereyra, Martins, Gilberto Sachetto, Cabral, Luiz Mors |
| Publisher | Universidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Agronomia e Ci?ncia do Solo, UFRRJ, Brasil, Instituto de Agronomia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ |
| Rights | info:eu-repo/semantics/openAccess |
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