Recursos de colección

UTL Repository Universidade Técnica de Lisboa (37.000 recursos)

O Repositório Institucional da Universidade Técnica de Lisboa desenvolvido no âmbito do projecto RCAAP. Este repositório destina-se a recolher, preservar e disponibilizar o acesso às publicações científicas e didácticas de seis: Escolas da UTL: Faculdade de Medicina Veterinária, Instituto Superior de Agronomia, Instituto Superior de Economia e Gestão, Instituto Superior de Ciências Sociais e Políticas , Faculdade de Motricidade Humana, Faculdade de Arquitectura. O Instituto Superior Técnico, igualmente Escola Da UTL, tem repositório independente.

LEAF - Centro de Investigação em Agronomia, Alimentos, Ambiente e Paisagem

Mostrando recursos 1 - 20 de 65

  1. Evapotranspiration partition and crop coefficients of Tifton 85 bermudagrass as affected by the frequency of cuttings. Application of the FAO56 Dual Kc Model

    Paredes, Paula; Rodrigues, Geraldo J.; Petry, Mirta T.; Severo, Paula O.; Carlesso, Reimar; Pereira, L.S.

  2. Modeling soil water dynamics and pasture growth in the montado ecosystem using MOHID land

    Simionesei, Lucian; Ramos, Tiago B.; Oliveira, Ana R.; Jongen, Marjan; Darouich, Hanaa; Weber, Kirsten; Proença, Vânia; Domingos, Tiago; Neves, Ramiro
    The southern Iberian Peninsula is characterized by evergreen oak woodlands (locally known as montado), which constitute an important savanna-type agro-silvo-pastoral ecosystem. This ecosystem is facing a progressive decline for several reasons, with the foremost being overgrazing. Better management tools are necessary to accurately quantify the systems’ carrying capacity and the sustainable stocking rates that prevent land degradation. The purpose of this study was to determine whether the MOHID-Land model could adequately simulate soil water dynamics and pasture growth in the montado ecosystem. The study area was located in the Alentejo region of southern Portugal. The model successfully simulated soil water contents and aboveground biomass during the 2010–2011 and...

  3. Ecological and ecotoxicological responses in the assessment of the ecological status of freshwater systems: A case study of the temporary stream Brejo of Cagarrão (South of Portugal)

    Palma, P.; Matos, C.; Alvarenga, P.; Kock-Schulmeyer, M.; Simões, I.; Barceló, D.; López de Alda, M.J.
    The objective of the study was to assess the integrated use of macroinvertebrate indexes and ecotoxicological parameters in the evaluation of the ecological status of a temporary stream with a strong agricultural influence. Water quality was analysed at two sampling sites along the stream, considering: chemical supporting parameters; hazardous substances (pesticides); benthic macroinvertebrate communities, through quality (Iberian Biological Monitoring Working Party and Iberian Average Score Per Taxon) and multi-metric indices (Southern Portuguese Index of Invertebrates and Ecological Quality Ratio); and ecotoxicological responses using lethal and sub-lethal bioassays. The water chemical characterization showed high levels of organic matter and nutrients, mainly in the dry period ((biochemical oxygen demand...

  4. Genetic and genomic tools to assist sugar beet improvment: the value of the crop wild relatives

    Monteiro, Filipa; Frese, Lothar; Castro, Sílvia; Duarte, Maria C.; Paulo, Octávio S.; Loureiro, João; Romeiras, Maria M.

  5. Can elevated air (CO2) conditions mitigate the predicted warming impact on the quality of coffee bean ?

    Ramalho, José C.; Pais, Isabel P.; Leitão, António E.; Guerra, Mauro; Reboredo, Fernando H.; Máguas, Cristina M.; Carvalho, Maria L.; Scotti-Campos, Paula; Ribeiro-Barros, Ana I.; Lidon, Fernando J.C.; DaMatta, Fábio M.
    Original Research

  6. The use of systems biology for enhancing crop abiotic stress tolerance

    Research Topic

  7. Alfaces na Avenida. Estratégias para (bem) alimentar a cidade


  8. Physiological and agronomical responses to environmental fluctuations of two portuguese grapevine varieties during three field seasons

    Carvalho, Luísa C.; Coito, João L.; Gonçalves, Elsa F.; Lopes, Carlos; Amâncio, Sara
    Extensive agricultural losses are attributed to heat, often combined with drought. These abiotic stresses occur in the field simultaneously, namely in areas with Mediterranean climate, where grapevine traditionally grows. The available scenarios for climate change suggest an increase in the frequency of heat waves and severe drought events in summer, also affecting the South of Portugal. In this work we monitored several productionrelated parameters and evaluated the state of the oxidative stress response apparatus of two grapevine varieties, Touriga Nacional (TN) and Trincadeira (TR), with and without irrigation, during three field seasons (2010 to 2012). Overall, results point to a high correlation of most...

  9. Olive tree (Olea europaea L.) diversity in traditional small farms of Ficalho, Portugal

    Veloso, Maria Manuela; Simões-Costa, Maria Cristina; Carneiro, Luís C.; Guimarães, Joana B.; Mateus, Célia; Fevereiro, Pedro; Pinto-Ricardo, Cândido
    The genetic diversity of “Gama” and “Bico de Corvo”, local cultivars of olive tree (Olea europaea) from seven traditional orchards of Ficalho (Alentejo region, Portugal), was studied to characterize the local diversity and assess the level of on farm diversity. Two different analytical systems were used: endocarp morphological characteristics and genetic analysis by microsatellite markers (Simple Sequence Repeats or SSR). The seven screened loci were polymorphic and allowed the identification of 23 distinct SSR profiles within the 27 trees analyzed. A total of 52 different alleles were scored, with an average of 7.43 alleles/SSR locus, and considerable genetic diversity was found. Neighbor-Joining algorithm cluster analysis and principal...

  10. Fusion proteins towards fungi and bacteria in plant protection

    Pinheiro, Ana Margarida; Carreira, Alexandra; Ferreira, Ricardo B.; Monteiro, Sara
    Research Article

  11. Basin irrigation design with multi-criteria analysis focusing on water saving and economic returns: application to wheat in Hetao, Yellow River basin

    Miao, Quingfeng; Shi, Haibin; Gonçalves, José M.; Pereira, L.S.
    The sustainability of the Hetao Irrigation System, located in the water scarce upper Yellow River basin, is a priority considering the need for water saving, increased water productivity, and higher farmers’ incomes. The upgrading of basin irrigation, the main irrigation method, is essential and includes the adoption of precise land levelling, cut-off management, improved water distribution uniformity, and adequate irrigation scheduling. With this objective, the current study focuses on upgrading wheat basin irrigation through improved design using a decision support system (DSS) model, which considers land parcels characteristics, crop irrigation scheduling, soil infiltration, hydraulic simulation, and environmental and economic impacts. Its use includes outlining water saving scenarios and...

  12. Phylogenetic relationships and phylogeography of relevant lineages within the complex Campanulaceae family in Macaronesia

    Menezes, Tiago; Romeiras, Maria M.; Sequeira, Miguel M.; Moura, Mónica
    Original Research

  13. Comparative metagenomics reveals the distinctive adaptive features of the Spongia officinalis endosymbiotic consortium

    Karimi, Elham; Ramos, Miguel; Gonçalves, Jorge M.S.; Xavier, Joana R.; Reis, Margarida P. Reis; Costa, Rodrigo
    Original Research

  14. Characterization of the primary matabolome of Brachystegia boehmii and Colophospermum mopane under different fire regimes in Miombo and Mopane African woodlands

    Duvane, Jossias A.; Jorge, Tiago F.; Maquia, Ivete; Ribeiro, Natasha; Ribeiro-Barros, Ana I.F.; António, Carla
    Original Research

  15. Durum wheat diversity for heat stress tolerance during inflorescence emergence is correlated to TdHSP101C expression in early developmental stages

    Bento, Miguel; Pereira, Sónia Gomes; Viegas, Wanda; Silva, Manuela
    Research article

  16. Using an unmanned ground vehicle to scout vineyards for non-intrusive estimation of canopy features and grape yield

    Lopes, Carlos M.; Torres, Albert; Guzman, Robert; Graça, João; Reyes, Miguel; Vitorino, Gonçalo; Braga, Ricardo; Monteiro, Ana; Barriguinha, André
    This paper aims to present some results of the EU VINBOT (Autonomous cloud-computing vineyard robot to optimize yield management and wine quality) project focused on vineyard yield estimation. A ground truth evaluation trial was set up in an experimental vineyard with two plots of the white varieties ‘Alvarinho’ and ‘Arinto’, trained on a vertical shoot positioning system and spur pruned. For each varietal plot, six smart points were selected with 10 contiguous vines each. During the ripening period of the 2016 season the vines were manually assessed for canopy dimensions and yield and then scanned by the VINBOT sensor head composed with a 2D laser rangefinder,...

  17. Gestão de infestantes em vinhas, olivais e pomares

    Portugal, João; Monteiro, Ana; Luz, João Pedro
    A implementação de culturas perenes, em Portugal, sofreu nas últimas décadas grandes alterações quer na instalação da cultura quer nas técnicas de gestão. Este artigo revê a gestão das infestantes nas principais culturas perenes em Portugal, o que se julga pertinente dado que se tem verificado a implementação de sistemas de modo de produção biológica (MPB) e de produção integrada (MProdi). Por infestante, os autores, consideram as populações de uma dada espécie vegetal que acima de determinados níveis e sob condicionalismos ecológicos particulares sejam responsáveis por prejuízos “líquidos” (balanço benefícios-prejuízos negativo) inaceitáveis em termos económicos e/ou ecológicos ou sociais. Primeiramente, apresentam-se os dados de 2015 relativamente...

  18. Leaf phytognostic characters of six species of Hypericum L. (Hypericaceae)

    Teixeira, Generosa; Monteiro, Ana
    Most of the studies on Hypericum genus deals with the phytochemical and pharmacological properties and the morphoanatomical data are scarce, although sometimes some species are poorly identified. In order to obtain differentiating phytognostic characters, the micromorphological, anatomical and histochemical study of mature leaves of six Hypericum species, H. androsaemum, H. calycinum, H. canariense, H. grandifolium, H. x inodorum and H. patulum, was carried out using different techniques of microscopy. Qualitative characters of both epidermal surfaces were evaluated: cell shape, cell wall, epicuticular deposits and stomata type. Only the last three characters showed some kind of differences. Five qualitative characters, stomata and gland indexes, total mesophyll thickness, palisade...

  19. The sulfur pathway and diagnosis of sulfate depletion in grapevine

    Tavares, Silvia; Amâncio, Sara
    Sulfur is an essential nutrient to all plant species. Plants assimilate sulfur in a well-described pathway, which has been taken up by roots. Regulatory mech- anism has been the subject of many research papers. However, recent studies highlighted differences between crop plants and the model plant Arabidopsis thaliana. Our work focuses on the identification of genes involved in the sulfur metabolism in the Vitis vinifera genome, and their response to sulfur deficiency and other abiotic stress endured by grapevine in the field, namely water stress. Here, we describe the identification and brief characterization of the first assimilation enzymes involved in the sulfur pathway, the enzyme responsible for sulfur...

  20. Deep analysis of wild Vitis flower transcriptome reveals unexplored genome regions associated with sex specification

    Ramos, Miguel Jesus Nunes; Coito, João Lucas; Fino, Joana; Cunha, Jorge; Silva, Helena; Almeida, Patrícia Gomes; Costa, Maria Manuela Ribeiro; Amâncio, Sara; Paulo, Octávio S.; Rocheta, Margarida
    Key message RNA-seq of Vitis during early stages of bud development, in male, female and hermaphrodite flowers, identified new loci outside of annotated gene models, suggesting their involvement in sex establishment. Abstract The molecular mechanisms responsible for flower sex specification remain unclear for most plant species. In the case of V. vinifera ssp. vinifera, it is not fully understood what determines hermaphroditism in the domesticated subspecies and male or female flowers in wild dioecious relatives (Vitis vinifera ssp. sylvestris). Here, we describe a de novo assembly of the transcriptome of three flower developmental stages from the three Vitis vinifera flower types. The validation of de novo assembly showed a correlation of 0.825....

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