Artigos - Periódicos Diversos

URI permanente desta seçãohttps://sbicafe.ufv.br/handle/123456789/14736

Navegar

Filtros

2005 - 20063

Configurações

Autor: search.filters.author.Pereira, Luiz Filipe Protasio

Resultados da Pesquisa

Agora exibindo 1 - 3 de 3
  • Imagem de Miniatura
    Item
    Ethylene production and acc oxidase gene expression during fruit ripening of Coffea arabica L.
    (Brazilian Journal of Plant Physiology, 2005-09) Pereira, Luiz Filipe Protasio; Galvão, Rafaelo M.; Kobayashi, Adilson K.; Cação, Sandra Maria B.; Vieira, Luiz Gonzaga Esteves
    The phytohormone ethylene is involved in several physiological and developmental processes in higher plants, including ripening of fruits, abscission of organs and tissues, senescence, wound response as well as in other abiotic stresses. The enzyme 1-aminocyclopropane-1-carboxylate oxidase (ACO) catalyzes the last step of ethylene biosynthesis. The production of ethylene and the expression of a Coffea arabica ACO gene during the last stages of fruit maturation were investigated. A rapid increase of ethylene production at the green-yellow stage of fruit ripening, after the end of endosperm formation, and a decrease of ethylene production at the cherry stage indicates a climacteric phase during ripening. An ACC oxidase (Ca-ACO) from coffee fruit cDNA was cloned and characterized using primers previously reported. The cDNA is homologous to previously described ACC oxidase cDNA in Coffea. The nucleotide and amino acid deduced sequences of the clone showed high homology with ACO from climacteric fruits. Northern blots were performed to determine the Ca-ACO transcription pattern from different tissues and from fruits at different ripening stages. Coffee fruits at an early ripening stage (green) showed the lowest level of Ca-ACO transcript accumulation. The transcript levels of Ca-ACO did not change significantly during the later stages, suggesting the presence of post- transcriptional control mechanisms. These results, taken together, strongly suggest a climacteric nature of coffee fruit ripening.
  • Imagem de Miniatura
    Item
    Brazilian coffee genome project: an EST-based genomic resource
    (Brazilian Journal of Plant Physiology, 2006-06) Vieira, Luiz Gonzaga Esteves; Andrade, Alan Carvalho; Colombo, Carlos Augusto; Moraes, Ana Heloneida de Araújo; Metha, Ângela; Oliveira, Angélica Carvalho de; Labate, Carlos Alberto; Marino, Celso Luis; Monteiro-Vitorello, Claúdia de Barros; Monte, Damares de Castro; Giglioti, Éder; Kimura, Edna Teruko; Romano, Eduardo; Kuramae, Eiko Eurya; Lemos, Eliana Gertrudes Macedo; Almeida, Elionor Rita Pereira de; Jorge, Érika C.; Albuquerque, Érika V. S.; Silva, Felipe Rodrigues da; Vinecky, Felipe; Sawazaki, Haiko Enok; Dorry, Hamza Fahmi A.; Carrer, Helaine; Abreu, Ilka Nacif; Batista, João A. N.; Teixeira, João Batista; Kitajima, João Paulo; Xavier, Karem Guimarães; Lima, Liziane Maria de; Camargo, Luis Eduardo Aranha de; Pereira, Luiz Filipe Protasio; Coutinho, Luiz Lehmann; Lemos, Manoel Victor Franco; Romano, Marcelo Ribeiro; Machado, Marcos Antonio; Costa, Marcos Mota do Carmo; Sá, Maria Fátima Grossi de; Goldman, Maria Helena S.; Ferro, Maria Inês T.; Tinoco, Maria Laine Penha; Oliveira, Mariana C.; Sluys, Marie-Anne Van; Shimizu, Milton Massao; Maluf, Mirian Perez; Eira, Mirian Therezinha Souza da; Guerreiro Filho, Oliveiro; Arruda, Paulo; Mazzafera, Paulo; Mariani, Pilar Drummond Sampaio Correa; Oliveira, Regina L.B.C. de; Harakava, Ricardo; Balbao, Silvia Filippi; Tsai, Siu Mui; Mauro, Sonia Marli Zingaretti di; Santos, Suzana Neiva; Siqueira, Walter José; Costa, Gustavo Gilson Lacerda; Formighieri, Eduardo Fernandes; Carazzolle, Marcelo Falsarella; Pereira, Gonçalo Amarante Guimarães
    Coffee is one of the most valuable agricultural commodities and ranks second on international trade exchanges. The genus Coffea belongs to the Rubiaceae family which includes other important plants. The genus contains about 100 species but commercial production is based only on two species, Coffea arabica and Coffea canephora that represent about 70 % and 30 % of the total coffee market, respectively. The Brazilian Coffee Genome Project was designed with the objective of making modern genomics resources available to the coffee scientific community, working on different aspects of the coffee production chain. We have single-pass sequenced a total of 214,964 randomly picked clones from 37 cDNA libraries of C. arabica, C. canephora and C. racemosa, representing specific stages of cells and plant development that after trimming resulted in 130,792, 12,381 and 10,566 sequences for each species, respectively. The ESTs clustered into 17,982 clusters and 32,155 singletons. Blast analysis of these sequences revealed that 22 % had no significant matches to sequences in the National Center for Biotechnology Information database (of known or unknown function). The generated coffee EST database resulted in the identification of close to 33,000 different unigenes. Annotated sequencing results have been stored in an online database at http://www.lge.ibi.unicamp.br/cafe. Resources developed in this project provide genetic and genomic tools that may hold the key to the sustainability, competitiveness and future viability of the coffee industry in local and international markets.
  • Imagem de Miniatura
    Item
    Genetic transformation of coffee
    (Brazilian Journal of Plant Physiology, 2006-06-14) Ribas, Alessandra Ferreira; Pereira, Luiz Filipe Protasio; Vieira, Luiz Gonzaga E.
    In the last 15 years, considerable advances were made in coffee genetic transformation. Different research groups in the world have been able to transform coffee with genes for insect resistance, decaffeinated coffee, herbicide resistance and control of fruit maturation. Although the majority of the research is still limited to laboratory and greenhouse studies, initial field tests with transformed coffee are beginning to appear in the literature. In this review we provide an update on the state of coffee genetic transformation, presenting technical aspects related to tissue culture systems, strategies for selection and transformation with particle bombardment, as well as the use of Agrobacterium tumefaciens. We also discuss the potential applications of this technology, taking into consideration the benefits, the possible environmental risks, as well as market and consumer issues.