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Erro
  • JFTP::login: Unable to login
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Stress abiótico: secura, salinidade e stress oxidativo

 

Resumo

Continuar...

 

Stress abiótico: calor e frio

 

Resumo

Plants adjust their metabolism in response to environmental stress conditions. However, heat stress due to high environmental temperatures is a serious threat to crop production worldwide.

Continuar...

 

Stress Biótico: resposta radicular à infecção por Phytophthora cinnamomi

 

Resumo

In Phytophthora, infection generally starts when motile zoospores released from sporangia reach a leaf or root surface, encyst, and germinate. Adhesion of cysts to plant surfaces occurs rapidly following zoospore encystment. The cysts germinate, and the germ tubes swell to form appressorium-like structures that facilitate adhesion and penetration of plant surfaces. In root-infecting species, penetration can occur in between cells without the aid of an appressorium. Penetration and colonization of host tissue involves the secretion of a range of degradative enzymes that break down physical barriers to infection. Suppression of host defences can occur through the production of inhibitory proteins that target host enzymes. P. cinnamomi can form chlamydospores, resistance structures that allow its survival in soil or decaying plant material, in a dormancy state. When conditions favouring growth prevail, the pathogen enters the asexual sporulation cycle, generating motile zoospores or produces hyphae that infect directly host roots.

Continuar...

 

Simbiose ectomicorrízica

 

Resumo

 

O projecto proposto tem como tema a simbiose ectomicorrízica (ECM). Nas florestas temperadas as árvores vivem em simbiose com fungos ECM e dependem destes para a sua sobrevivência. Enquanto o fungo fornece nutrientes do solo, em particular fósforo e azoto, à planta hospedeira, a planta transfere fotoassimilados ao fungo. Além de aumentar o crescimento das plantas, esta simbiose também aumenta a absorção de água, a tolerância a agentes patogénicos e a solos contaminados. As ECMs são essenciais para a sobrevivência do sobreiro para facilitar a aquisição de nutrientes e água. O objectivo desta proposta é a obtenção de ESTs putativamente envolvidas no desenvolvimento da simbiose ECM em sobreiro. Para atingir esse objectivo, as raízes de plantas micorrizadas serão usadas para a construção de uma biblioteca de cDNA a partir da qual serão sequenciadas ESTs que irão ser utilizadas para a construção do chip de sobreiro.

Continuar...

 

Análise transcriptomica da qualidade da cortiça e da diferenciação cambial em Quercus suber

 

Resumo

O objectivo deste projecto é contribuir para o preenchimento da lacuna do conhecimento do transcriptoma dos componentes fundamentais para crescimento secundário no sobreiro, e nas Fagaceae em geral, dando prioridade aos tecidos vasculares secundários (XILEMA EM DIFFERENCIAÇÃO e FLOEMA) e ao FELEMA em diferenciação, e ainda à qualidade da cortiça, tecidos que se encontram muito pouco representado nas bases de dados públicas de etiquetas de sequências expressas (ESTs).

Continuar...

 

Produção de cortiça

 

Resumo

The cork oak (Quercus suber) forest (the “montado”) is a unique and emblematic resource for Portugal, due to its ecological and socio-economic significance, and the commercial value of cork. Portugal is the main cork producer (about 1/3 of the world production). Little is known about Q. suber germplasm diversity, stress plasticity and cork formation, though this species has recently become in Portugal, a priority target of several research projects on ecophysiology and selection.

Continuar...

 

Qualidade da Cortiça

 

Resumo

In this project, the focus will be on the production of expressed sequence tags (ESTs) related to cork quality. Cork quality is based on the presence of lenticel channels crossing all the cork thickness. Cork is classified as of good quality (the one that is used for bottle stoppers) if showing a reduced number of channels. Upon a certain number of lenticel channels per area, cork is no longer suitable for stoppers production. Due to the economic importance of this industrial sector, cork quality is a crucial factor. For the production of ESTs, samples from well characterized trees regarding cork quality (superior /inferior quality) will be used.

Continuar...

 

Desenvolvimento dos gametófitos masculino e feminino

 

Resumo

Continuar...

 

Desenvolvimento do fruto e do embrião

 

Resumo

Within this project of the Cork oak ESTs Consortium, the focus will be on the transcriptomics of fruit and embryo development. Our target tissues are representative of an important stage of the plant life cycle. It is expected that a set of genes with crucial regulatory and developmental roles are being transcribed during this period.

Continuar...

 

Abrolhamento e desenvolvimento foliar

 

Resumo

Continuar...

 

Plataforma Bioinformática

 

Resumo

The present project focuses on the deployment and the maintenance of the bioinformatics platform on which the assembled EST contigs will be stored, organized and annotated.

Continuar...

 

Detecção e validação de polimorfismos

 

Resumo

O montado de sobro (Quercus suber) constitui um recurso nacional único e emblemático, devido ao seu significado ecológico e sócio-económico e ao valor comercial da cortiça de que Portugal é o principal produtor (ca 1/3 da produção mundial). O conhecimento actual sobre a diversidade do germoplasma de Q. suber, a sua plasticidade ao stress e a formação da cortiça, entre outros aspectos é escasso, apesar da investigação recente nas áreas de ecofisiologia e da selecção/melhoramento.
Os carvalhos Mediterrânicos de folha perene (sobreiro e azinheira) estão ameaçados por políticas desastrosas do uso do solo, mudanças climáticas, stresses bióticos e incêndios. Para proteger a riqueza destes ecossistemas em Portugal e no sul da Europa, urge fazer mais investigação nestas espécies. As respostas aos stresses biótico e abiótico e aos processos de desenvolvimento−vegetativo e reprodutivo, produção de sementes − e os mecanismos de formação de cortiça são temas prioritários de investigação.

Continuar...

 
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