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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.2014.tde-20032014-165537
Document
Author
Full name
Ana Paula Mendes Silva
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 2014
Supervisor
Committee
Pinheiro, José Baldin (President)
Barros, Everaldo Gonçalves de
Vitorello, Claudia Barros Monteiro
Title in Portuguese
Expressão gênica associada à resistência da soja a Piezodorus guildinii
Keywords in Portuguese
Glycine max
Resistência à insetos
RNA-Seq
Transcriptoma
Abstract in Portuguese
A soja é uma cultura de grande importância, movimentando aproximadamente 230 bilhões de dólares em todo o mundo, com produção anual estimada de 267,61 milhões de toneladas. Os percevejos sugadores de sementes são considerados uma das pragas de maior importância para a cultura da soja, sendo as espécies Euschistus heros (E.), Piezodorus guildinii (West.) e Nezara viridula (L.) as mais abundantes no Brasil. O ataque por percevejos causa diversos problemas como o atraso da maturação fisiológica, retenção foliar, perdas no rendimento e diminuição da qualidade e potencial germinativo das sementes. Esses insetos são responsáveis ainda pela transmissão de patógenos, e podem causar alterações na composição de óleos, proteínas e ácidos graxos das sementes. A obtenção de cultivares com resistência genética é indispensável, a fim de minimizar a necessidade de utilização de defensivos agrícolas. Dessa forma, este trabalho identificou genes possivelmente associados à resposta de resistência pela comparação da expressão gênica diferencial entre genótipos de soja resistente (IAC-100) e suscetível (CD-215), a partir da metodologia de sequenciamento de RNA (RNA-Seq). As vagens foram submetidas a dois tratamentos por 24 horas: infestação por percevejos Piezodorus guildinii (West.) e não infestação. Foi utilizado o alinhador STAR contra o genoma hardmasked do phytozome e o pacote cufflinks.Com os resultados das análises dos genes diferencialmente expressos e uma posterior filtragem foi possível identificar 128 genes candidatos, dentre estes: genes relacionados com defesa, metabolismo secundário de produção de terpenos e proteínas LRR de sinalização celular.
Title in English
Gene expression associated with soybean resistance to Piezodorus guildinii
Keywords in English
Glycine max
Insect Resistance
RNA-Seq
Transcriptome
Abstract in English
Soybeans are an important crop with a world-wide annual production of 267.61 tons, worth 230 billion dollars. Stink bugs are a major soybean pest. The most abundant species in Brazil are Euschistus heros (E.), Piezodorus guildinii (West.) and Nezara viridula (L.). Stink-bug attack causes several problems, including delayed physiological maturity, leaf retention, yield losses, decreased seed quality, and decreased germination potential. The bugs are responsible for transmitting pathogens, and they can cause changes in the oil, protein, and fatty acids composition in the seed. Producing genetically resistant cultivars is critical in order to minimize the need for agricultural pesticides. Our work aims to identify genes associated with the stink-bug resistance response in soybean by comparing differential gene expression between resistant (IAC-100) and susceptible (CD-215) genotypes by analyzing RNA sequencing (RNA-Seq) data. Data was from soybean pods that were subjected to two treatments for 24 hours: infestation by the stink bug Piezodorus guildinii (West.), and non-infestation. STAR aligner was used against the hard-masked genome sequence from Phytozome, followed by analysis using the Cufflinks package. Analysis of the results of the differentially expressed genes and a subsequent filtering identified 128 candidate defense-associated genes, among them, defense-related such as LRR-RLKs and production of secondary metabolites like terpenes.
 
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Publishing Date
2014-03-31
 
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