Browsing by Author "Rocheta, Margarida"
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- A comprehensive assessment of the transcriptome of cork oak (Quercus suber) through EST sequencingPublication . Pereira-Leal, José B; Abreu, Isabel A; Alabaça, Cláudia S; Almeida, Maria; Almeida, Paulo; Almeida, Tânia; Amorim, Maria; Araújo, Susana; Azevedo, Herlânder; Badia, Aleix; Batista, Dora; Bohn, Andreas; Capote, Tiago; Carrasquinho, Isabel; Chaves, Inês; Coelho, Ana; Costa, Maria; Costa, Rita; Cravador, Alfredo; Egas, Conceição; Faro, Carlos; Fortes, Ana M; Fortunato, Ana S; Gaspar, Maria; Gonçalves, Sónia; Graça, José; Horta, Marília; Inácio, Vera; Leitão, José M; Lino-Neto, Teresa; Marum, Liliana; Matos, José; Mendonça, Diogo; Miguel, Andreia; Miguel, Célia M; Morais-Cecílio, Leonor; Neves, Isabel; Nóbrega, Filomena; Oliveira, Maria; Oliveira, Rute; Pais, Maria; Paiva, Jorge A; Paulo, Octávio S; Pinheiro, Miguel; Raimundo, João AP; Ramalho, José C; Ribeiro, Ana I; Ribeiro, Teresa; Rocheta, Margarida; Rodrigues, Ana; Rodrigues, José C; Saibo, Nelson JM; Santo, Tatiana E; Santos, Ana; Sá-Pereira, Paula; Sebastiana, Mónica; Simões, Fernanda; Sobral, Rómulo S; Tavares, Rui; Teixeira, Rita; Varela, Carolina; Veloso, Maria; Ricardo, Cândido PPCork oak (Quercus suber) is one of the rare trees with the ability to produce cork, a material widely used to make wine bottle stoppers, flooring and insulation materials, among many other uses. The molecular mechanisms of cork formation are still poorly understood, in great part due to the difficulty in studying a species with a long life-cycle and for which there is scarce molecular/genomic information. Cork oak forests are of great ecological importance and represent a major economic and social resource in Southern Europe and Northern Africa. However, global warming is threatening the cork oak forests by imposing thermal, hydric and many types of novel biotic stresses. Despite the economic and social value of the Q. suber species, few genomic resources have been developed, useful for biotechnological applications and improved forest management.
- Heat and water stress induce unique transcriptional signatures of heat-shock proteins and transcription factors in grapevinePublication . Rocheta, Margarida; Becker, Jörg D.; Coito, João L.; Carvalho, Luísa; Amâncio, SaraGrapevine is an extremely important crop worldwide.In southern Europe, post-flowering phases of the growth cycle can occur under high temperatures, excessive light, and drought conditions at soil and/or atmospheric level. In this study, we subjected greenhouse grown grapevine, variety Aragonez, to two individual abiotic stresses, water deficit stress(WDS), and heat stress (HS). The adaptation of plants to stress is a complex response triggered by cascades of molecular net works involved in stress perception, signal transduction, and the expression of specific stress-related genes and metabolites. Approaches such as array-based transcript profiling allow assessing the expression of thousands of genes in control and stress tissues. Using microarrays, we analyzed the leaf transcriptomic profile of the grapevine plants. Photosynthesis measurements verified that the plants were significantly affected by the stresses applied. Leaf gene expression was obtained using a high-throughput transcriptomic grapevine array, the 23K custom-made Affymetrix Vitis GeneChip. We identified 1,594 genes as differentially expressed between control and treatments and grouped them into ten major functional categories using MapMan software. The transcriptome of Aragonez was more significantly affected by HS when compared with WDS. The number of genes coding for heat-shock proteins and transcription factors expressed solely in response to HS suggesting their expression as unique signatures of HS. However, across-talk between the response pathways to both stresses was observed at the level of AP2/ERF transcription factors.
- Transcriptomic comparison between two Vitis vinifera L. varieties (Trincadeira and Touriga Nacional) in abiotic stress conditionsPublication . Rocheta, Margarida; Coito, João L; Ramos, Miguel J N; Carvalho, Luísa; Becker, Jörg D; Carbonell-Bejerano, Pablo; Amâncio, SaraPredicted climate changes announce an increase of extreme environmental conditions including drought and excessive heat and light in classical viticultural regions. Thus, understanding how grapevine responds to these conditions and how different genotypes can adapt, is crucial for informed decisions on accurate viticultural actions. Global transcriptome analyses are useful for this purpose as the response to these abiotic stresses involves the interplay of complex and diverse cascades of physiological, cellular and molecular events. The main goal of the present work was to evaluate the response to diverse imposed abiotic stresses at the transcriptome level and to compare the response of two grapevine varieties with contrasting physiological trends, Trincadeira (TR) and Touriga Nacional (TN).