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| Registros recuperados: 258 | |
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| Rodrigues, William Costa; Cassino, Paulo Cesar Rodrigues. |
| Com o propósito de conhecer os parasitóides de cochonilhas e aleirodídeos, associados às plantas cítricas no Estado do Rio de Janeiro, foram realizadas coletas de folhas contendo os fitoparasitos: Aleurothrixus floccosus (Maskell), Tetraleurodes (=Aleurotrachelus) cruzi (Cassino), Paraleyrodes bondari Peracchi, Coccus viridis (Green), Crysomphalus ficus (Ashmead), Orthezia praelonga (Douglas) e Pinnaspis aspidistrae (Signoret), sendo estas limpas, em seguida procedia-se a eliminação dos organismo que eram objeto de estudo (cada folha permanecia com um única espécie de fitoparasito, para que os parasitóides que surgissem fossem mesmo associados àquela espécie). Após este procedimento as folhas foram incubadas por um período de 25 dias, onde foi observado... |
| Tipo: Article |
Palavras-chave: Citros; Controle biológico; Inimigos naturais; Hymenoptera; Parasitismo; Biological control; Citrus; Hymenoptera; Natural enemies; Parasitism. |
| Ano: 2012 |
URL: http://hdl.handle.net/2315/232 |
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| Salinas Vargas, Delfina. |
| El objetivo del presente trabajo fue identificar y caracterizar la fluctuación y densidad poblacional de tres especies vectoras del virus Citrus leprosis virus-C (CiLV-C) en los estados de Yucatán, Campeche y Quintana Roo, para su eventual aplicación en el desarrollo de sistemas de muestreo en programas oficiales de detección en México. Durante el período de febrero 2010 a febrero 2011, se realizaron ocho muestreos en 100 árboles/parcela. Se obtuvieron muestras de Citrus sinensis, C. aurantium, C. reticulata, C. latifolia, C. paradisi y C. reticulata x C. sinensis. La identificación de las especies de Brevipalpus spp. se realizó con preparaciones de ácaros montados en líquido de Hoyer y observaciones con microscopio electrónico de barrido. La determinación... |
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Palavras-chave: Brevipalpus; Fluctuación poblacional; Cítricos; CiLV-C; Entomología y Acarología; Maestría; Population fluctuation; Citrus. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1777 |
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| Mendoza Peña, Estrella. |
| El Huanglongbing (HLB) es una enfermedad de los cítricos que se caracteriza por causar áreas moteadas en hojas, generar frutos deformes y decolorados, semillas abortivas, causar pérdida paulatina de la producción y provocar que la muerte de los árboles infectados sea inevitable. El agente asociado a esta enfermedad es la bacteria Candidatus Liberibacter ssp., y en México es dispersada por el vector Diaphorina citri Kuwayama (Hemiptera: Liviidae). En el presente estudio, mediante el método de microextracción en fase solida (SPME) se recolectaron compuestos volátiles emitidos de brotes vegetativos (menores a 3 cm) sanos, así como de brotes infectados con Ca. L. asiaticus, de limón persa (Citrus latifolia Tanaka) y limón mexicano (Citrus aurantifolia... |
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Palavras-chave: Cítricos; SPME; Psílido asiático; B-ocimeno; D-limoneno; Brotes vegetativos; Citrus; Psyllid; B-ocimene; D-limonene; Vegetative shoots; Entomología y Acarología; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2155 |
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| Martínez Hernández, María de Jesús. |
| La multiplicación de plantas in vitro presenta varias etapas críticas, desde la selección de los componentes para la germinación, multiplicación y enraizamiento hasta el proceso de aclimatación en invernadero. En la presente investigación se utilizaron los sustratos inertes (vermiculita, agrolita y tezontle) como medio de soporte en sustitución del agar y los azúcares xilosa, fructosa y 10X20F se compararon con la sacarosa, en su efecto sobre la germinación, multiplicación, enraizamiento y sobrevivencia de los portainjertos de cítricos: Citrus volkameriana, Citrumelo swingle y Citrange 35. Además de probar diferentes intensidades luz en el proceso de aclimatación de plántulas de Citrus volkameriana con diferentes sustratos y una reducción gradual... |
| Tipo: Tesis |
Palavras-chave: Cultivo in vitro; Sustratos inertes; Cítricos; Doctorado; Agroecosistemas tropicales; Tissue culture; Inert substrates; Citrus. |
| Ano: 2007 |
URL: http://hdl.handle.net/10521/1263 |
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| Federici,María Teresa; Marcondes,Jackson A; Picchi,Simone Cristina; Stuchi,Eduardo S; Fadel,André Luiz; Laia,Marcelo L; Lemos,Manoel Victor F; Lemos,Eliana Gertrudes Macedo. |
| Xylella fastidiosa inhabits the plant xylem, a nutrient-poor environment, so that mechanisms to sense and respond to adverse environmental conditions are extremely important for bacterial survival in the plant host. Although the complete genome sequences of different Xylella strains have been determined, little is known about stress responses and gene regulation in these organisms. In this work, a DNA microarray was constructed containing 2,600 ORFs identified in the genome sequencing project of Xylella fastidiosa 9a5c strain, and used to check global gene expression differences in the bacteria when it is infecting a symptomatic and a tolerant citrus tree. Different patterns of expression were found in each variety, suggesting that bacteria are responding... |
| Tipo: Journal article |
Palavras-chave: Citrus; Microarray; Xylella fastidiosa. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300004 |
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| Pires,Regina C. de M; Bodine Junior,Décio; Sakai,Emílio; Villar,Heloísa L; Silva,Tonny J. A. da; Arruda,Flávio B. |
| The aim of this study was to evaluate the effect of different microirrigation designs on root system distribution in wet bulb region, orange orchard yield and quality of orange fruits. The experiment was installed as random blocks with five treatments and four replicates in an orchard of 'Pêra' orange trees grafted on 'Cleopatra' mandarin rootstock. The treatments consisted of: one drip line (T1), two drip lines (T2), four drip lines (T3) per planting row, microsprinkler irrigation (T4) and without irrigation (T5). Irrigation treatments favored yield and ºBrix. The treatment with a single drip line (T1) showed the greatest quantity of roots in relation to the treatments T2 and T3. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Trickle irrigation; Microsprinkler irrigation; Citrus; Water management. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000600007 |
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| Glienke-Blanco,Chirlei; Aguilar-Vildoso,Carlos Ivan; Vieira,Maria Lúcia Carneiro; Barroso,Paulo Augusto Vianna; Azevedo,João Lúcio. |
| During some phases of of their life-cycle endophytic fungi colonize plants asymptomatically being found most frequently inside the aerial part of plant tissues. After surface disinfection of apparently healthy leaves from three varieties of mandarin orange and one tangor, and after incubation on appropriate culture medium, 407 fungal isolates were obtained, giving a total infection frequency of 81%. No fungal growth was observed from disinfected seeds, indicating that fungi are probably not transmitted via seeds. Of the fungal isolates, 27% belonged to the genus Guignardia, with 12 isolates being identified as Guignardia citricarpa Kiely, which is described as a citrus pathogen. The isolates were variable in respect to the presence of sexual structures and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; Endophytes; Genetic variability; Guignardia citricarpa; Mandarin; RAPD. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000200021 |
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| Carvalho,Flávia Maria de Souza; Caramori,Lázara Pereira Campos; Leite Júnior,Rui Pereira. |
| Xanthomonas axonopodis pv. citri strains that cause disease in citrus were investigated by pulsed field and plasmid profile analysis. For the first method, genomic DNA was digested by the rare-cutting enzymes Xba I and Vsp I. The strains evaluated were collected in seven different States of Brazil and in Argentina, Bolivia, Paraguay and Uruguay. Genetic variability was found among strains of X. axonopodis pv. citri from different geographical areas Argentina, Bolivia and Uruguay, with similarities varying from 0.62 to 0.83. However, the strains collected in Brazil, despite being from different States, have shown a genetic similarity ranging from 0.83 to 1.00. Cluster analysis showed a relationship between genomic similarity and geographical origin of the... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Genetic variability; Bacterium; Citrus; PFGE. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000300020 |
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| Wickert,Ester; Marcondes,Jackson; Lemos,Manoel Victor; Lemos,Eliana G.M.. |
| Assimilation of nitrate and ammonium are vital procedures for plant development and growth. From these primary paths of inorganic nitrogen assimilation, this metabolism integrates diverse paths for biosynthesis of macromolecules, such as amino acids and nucleotides, and the central intermediate metabolism, like carbon metabolism and photorespiration. This paper reports research performed in the CitEST (Citrus Expressed Sequence Tag) database for the main genes involved in nitrogen metabolism and those previously described in other organisms. The results show that a complete cluster of genes involved in the assimilation of nitrogen and the metabolisms of glutamine, glutamate, aspartate and asparagine can be found in the CitEST data. The main enzymes found... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen assimilation; Citrus; CitEST datamining. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500009 |
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| Targon,Maria Luísa P. Natividade; Takita,Marco Aurélio; Amaral,Alexandre M. do; Souza,Alessandra A. de; Locali-Fabris,Eliane Cristina; Dorta,Sílvia de Oliveira; Borges,Kleber Martins; Souza,Juliana Mendonça de; Rodrigues,Carolina Munari; Lucheta,Adriano Reis; Freitas-Astúa,Juliana; Machado,Marcos Antonio. |
| In order to obtain a better understanding of what is citrus, 33 cDNA libraries were constructed from different citrus species and genera. Total RNA was extracted from fruits, leaves, flowers, bark, seeds and roots, and subjected or not to different biotic and abiotic stresses (pathogens and drought) and at several developmental stages. To identify putative promoter sequences, as well as molecular markers that could be useful for breeding programs, one shotgun library was prepared from sweet orange (Citrus sinensis var. Olimpia). In addition, EST libraries were also constructed for a citrus pathogen, the oomycete Phythophthora parasitica in either virulent or avirulent form. A total of 286,559 cDNA clones from citrus were sequenced from their 5 end,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ESTs; Shotgun; Citrus; Phytopathogen. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500030 |
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| Mehta,Angela; Silva,Marilia Santos; Guidetti-Gonzalez,Simone; Carrer,Helaine; Takita,Marco Aurélio; Martins,Natália F.. |
| Citrus spp. are economically important crops, which in Brazil are grown mainly in the State of São Paulo. Citrus cultures are attacked by several pathogens, causing severe yield losses. In order to better understand this culture, the Millenium Project (IAC Cordeirópolis) was launched in order to sequence Citrus ESTs (expressed sequence tags) from different tissues, including leaf, bark, fruit, root and flower. Plants were submitted to biotic and abiotic stresses and investigated under different development stages (adult vs. juvenile). Several cDNA libraries were constructed and the sequences obtained formed the Citrus ESTs database with almost 200,000 sequences. Searches were performed in the Citrus database to investigate the presence of different... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; Cell signaling; Genomics. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500003 |
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| Peroni,Luis Antonio; Ferreira,Renato Rodrigues; Figueira,Antonio; Machado,Marcos Antonio; Stach-Machado,Dagmar Ruth. |
| Plants not only evolve but also reduce oxygen in photosynthesis. An inevitable consequence of this normal process is the production of reactive oxygen species (ROS). Plants are adequately protected by the presence of multiple antioxidative enzymes in the cytosol and also in the different cell organelles such as chloroplasts, mitochondria, and peroxisomes. Traditionally, ROS were considered to be only a toxic byproduct of aerobic metabolism. However, recently it has become apparent that plants actively produce these molecules which may control many different physiological processes such as abiotic and biotic stress response, pathogen defense and systemic signaling. The search results using the Citrus Genome Program in Brazil (CitEST) for oxidative stress... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; Genome; EST; Reactive oxygen species; Oxidative stress enzyme. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500016 |
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| Bordignon,Rita; Medina-Filho,Herculano Penna; Siqueira,Walter José; Teófilo Sobrinho,Joaquim. |
| Controlled pollinations between four elite citrus rootstocks, Citrus limonia - 'Limeira' rangpur lime (Cravo), C. sunki - 'Sunki' mandarin (Sunki), C. aurantium - 'São Paulo' sour orange (Azeda) and Poncirus trifoliata - 'Davis A' trifoliate orange (Trifoliata), resulted in 1614 nucelar and 1938 hybrid plants identified by the isozyme loci Pgi-1, Pgm-1, Got-1, Got-2, Aps-1, Me-1, Prxa-1 and or by the morphological markers broadness of leaf petiole wing or trifoliolate leaves. Tolerance to the citrus tristeza virus (CTV) was evaluated under nursery and field conditions for several years by the reaction of Valencia orange infected with a severe strain of CTV and grafted onto the hybrids and nucellar clones. Genetic analyses indicated that tolerance was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; CTV; Epistasis; Rootstock; Tristeza. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200013 |
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| Cristofani-Yaly,Mariângela; Berger,Irving J.; Targon,Maria Luisa P.N.; Takita,Marco A.; Dorta,Sílvia de O.; Freitas-Astúa,Juliana; Souza,Alessandra A. de; Boscariol-Camargo,Raquel L.; Reis,Marcelo S.; Machado,Marcos A.. |
| Citrus is the most important fruit crop in Brazil and Citrus tristeza virus (CTV) is considered one of the most important pathogens of citrus. Most citrus species and varieties are susceptible to CTV infection. However, Poncirus trifoliata, a close relative of citrus, is resistant to the virus. In order to better understand the responses of citrus plants to the infection of CTV, we constructed expressed sequence tag (EST) libraries with tissues collected from Poncirus trifoliata plants, inoculated or not with Citrus tristeza virus at 90 days after inoculation, grafted on Rangpur lime rootstocks. We generated 17,867 sequence tags from Poncirus trifoliata inoculated (8,926 reads) and not (8,941 reads) with a severe CTV isolate. A total of 2,782 TCs... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; Disease resistance; Citrus tristeza virus; Biotic stress. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500025 |
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| Campos,Magnólia A.; Rosa,Daniel D.; Teixeira,Juliana Érika C.; Targon,Maria Luisa P.N.; Souza,Alessandra A.; Paiva,Luciano V.; Stach-Machado,Dagmar R.; Machado,Marcos A.. |
| In silico expression profiles, of the discovered 3,103 citrus ESTs putatively encoding for PR protein families (PR-1 to PR-17), were evaluated using the Brazil citrus genome EST CitEST/database. Hierarchical clustering was displayed to identify similarities in expression patterns among citrus PR-like gene families (PRlgf) in 33 selected cDNA libraries. In this way, PRlgf preferentially expressed by organ and citrus species, and library conditions were highlighted. Changes in expression profiles of clusters for each of the 17 PRlgf expressed in organs infected by pathogens or drought-stressed citrus species were displayed for relative suppression or induction gene expression in relation to the counterpart control. Overall, few PRlgf showed expression 2-fold... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; Functional genome; Ests; Gene expression profiles; Pathogenesis-related proteins; Defense genes. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500020 |
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| Registros recuperados: 258 | |
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