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Efecto Inhibidor del Extracto Acuoso de las Teliosporas Telióides del Hongo Puccinia pampeana Speg., sobre Agentes Causales de Royas
Passador, Martha Maria;Barreto Figueiredo, Mário;Furtado, Edson Luiz;
Revista mexicana de fitopatología , 2008,
Abstract: green pepper rust is caused by the fungus puccinia pampeana. since this fungus has two distinct telial forms, it is classified as a biteliomorphic rust. the first form occurs at the beginning of symptom appearance, with aecidioid, golden-yellow, catenulate teliospores surrounded by a peridium. the second one occurs at the end of the fungus cycle in the host, with dark brown, pulvinate, bicellular, pedicellate telioid teliospores, which contain germination self-inhibiting substances in their walls, that can be removed by washing. aqueous extracts were prepared with 20 mg of puccinia pampeana telioid teliospores, and tested on germination inhibition of aecidioid teliospores of the same rust and of urediniospores of coleosporium plumierae and hemileia vastratrix. the inhibiting effect was demonstrated by measuring metabasidial length (aecidioid teliospores of p. pampeana) and germ tube length of c. plumierae and h. vastratrix. the inhibiting effect was verified after 4 and 6 h of contact of spores with the extracts.
Variability in isolates of Puccinia polysora in Brazil
CASELA, CARLOS R.;FERREIRA, ALEXANDRE S.;
Fitopatologia Brasileira , 2002, DOI: 10.1590/S0100-41582002000400015
Abstract: the main objective of this work was to evaluate the variability of the southern rust pathogen puccinia polysora in brazil, based on its virulence on a set of maize (zea mays) cultivars. sixty single pustule isolates, from different areas of occurrence of southern rust, were evaluated for their virulence to 50 maize experimental hybrids. six cultivars showed a clear distinction between susceptible and resistant reaction, and were used to characterize the variability of the pathogen. seventeen virulence patterns were identified among the 60 isolates tested. the most frequent virulence patterns identified, were observed in all locations of sampling, which suggests the absence of geographical differentiation among prevalent populations of p. polysora in brazil.
Variability in isolates of Puccinia polysora in Brazil  [cached]
CASELA CARLOS R.,FERREIRA ALEXANDRE S.
Fitopatologia Brasileira , 2002,
Abstract: The main objective of this work was to evaluate the variability of the southern rust pathogen Puccinia polysora in Brazil, based on its virulence on a set of maize (Zea mays) cultivars. Sixty single pustule isolates, from different areas of occurrence of southern rust, were evaluated for their virulence to 50 maize experimental hybrids. Six cultivars showed a clear distinction between susceptible and resistant reaction, and were used to characterize the variability of the pathogen. Seventeen virulence patterns were identified among the 60 isolates tested. The most frequent virulence patterns identified, were observed in all locations of sampling, which suggests the absence of geographical differentiation among prevalent populations of P. polysora in Brazil.
Meiotic irregularities in Capsicum L. species
Souza, Margarete Magalh?es;Pereira, Telma Nair Santana;Sudré, Cláudia Pombo;Rodrigues, Rosana;
Crop Breeding and Applied Biotechnology , 2012, DOI: 10.1590/S1984-70332012000200007
Abstract: cytogenetic and pollen viability (pv) studies were performed in pepper accessions, capsicum chinense and capsicum baccatum. irregularities such as laggard and univalent chromosomes, bridges, problems in the spindle fibers and cytomixis were observed, especially in c. baccatum which was the most unstable genotype. in the post-meiotic products, irregularities were observed, on average, at 20 % of the microspores in c. baccatum and 17 % in c. chinense. pv in c. baccatum was below 70 %, while in c. chinense, it was above 80 %. meiotic irregularities in capsicum, mainly in c. baccatum, considering the low pv estimated, were significant but not impeditive for fertilization.
PUCCINIA SCHULTESIANTHI, NUEVA ESPECIE BITELIOMóRFICA SOBRE SOLANACEAE PUCCINIA SCHULTESIANTHI, NEW BITELIOMORPHIC SPECIES ON SOLANACEAE  [cached]
Diana Marcela Gallo Agudelo,Víctor Manuel Pardo Cardona,Mauricio Salazar Yepes,Pablo Buriticá Cespedes
Revista Facultad Nacional de Agronomía, Medellín , 2011,
Abstract: Se describe, proveniente de colecciones colombianas, la nueva especie biteliomórfica de Uredinales Puccinia schultesianthi colectada sobre Schultesianthus coriaceus, planta eminentemente neotropical-andina perteneciente a la familia Solanaceae. Se hacen algunas consideraciones taxonómicas acerca de su biología. Puccinia schultesianthi, a new biteliomorphic species of Uredinales on Schultesianthus coriaceus, Solanaceae, from Colombia is described. Some taxonomical and biological considerations are done.
PUCCINIA SCHULTESIANTHI, NUEVA ESPECIE BITELIOMóRFICA SOBRE SOLANACEAE
Gallo Agudelo,Diana Marcela; Pardo Cardona,Víctor Manuel; Salazar Yepes,Mauricio; Buriticá Cespedes,Pablo;
Revista Facultad Nacional de Agronomía, Medellín , 2011,
Abstract: puccinia schultesianthi, a new biteliomorphic species of uredinales on schultesianthus coriaceus, solanaceae, from colombia is described. some taxonomical and biological considerations are done.
Identidade e propriedades de isolados de potyvírus provenientes de Capsicum spp.  [cached]
Truta Adriana A.C.,Souza Ana R. R. e,Nascimento Ana V. S. do,Pereira Rita de Cássia
Fitopatologia Brasileira , 2004,
Abstract: Vinte isolados virais provenientes de Capsicum spp. foram coletados em Minas Gerais, S o Paulo, Espírito Santo e Rio de Janeiro visando definir a etiologia dos mosaicos. Para a caracteriza o biológica realizou-se teste de gama de hospedeiros e inocula o em cultivares diferenciadoras de piment o (Capsicum annuum). Dois isolados provenientes de batata (Solanum tuberosum) (PVY N-BR e PVY O-BR) foram utilizados como controles. Os resultados indicaram considerável grau de variabilidade biológica entre os isolados, embora todos tenham sido identificados preliminarmente como Potato virus Y (PVY). A rea o das cultivares diferenciadoras classificou os isolados como patótipo 1 ou 1.2 de PVY. Anti-soros foram produzidos a partir de partículas virais purificadas de um isolado fraco e um forte. O uso desses anti-soros em ELISA indireto levou a resultados positivos contra os isolados testados. Os anti-soros reagiram também contra PVY N-BR e PVY O-BR, embora este último tenha apresentado rea o mais fraca. Para caracteriza o molecular, seqüenciaram-se os genes da polimerase (NIb) e da proteína capsidial (cp), e da regi o 3' n o-traduzida (3'NTR) de isolados biologicamente distintos. A análise filogenética confirmou a identidade de seis isolados como Pepper yellow mosaic virus (PepYMV), um potyvírus descrito recentemente infetando piment o no Brasil. Esse resultado sugere que o PepYMV pode ser a espécie de potyvírus predominante em Capsicum spp. no Brasil. O fato de isolados de PepYMV apresentarem gama de hospedeiros semelhante à do PVY, e de os dois vírus apresentarem relacionamento sorológico, ressalta a utilidade da análise molecular para a classifica o de potyvírus provenientes de Capsicum spp.
MICROPROPAGATION OF CAPSICUM ANNUUM L
K. SANATOMBI,G. J. SHARMA
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2007,
Abstract: An efficient micropropagation protocol was developed for Capsicum annuum L. cv. 'Morok Amuba', an ornamental chilli cultivar using shoo-tip and axillary shoot-tip explants. Multiple shoot buds were induced from shoot-tip explants on MS medium containing cytokinins alone or in combination with IAA. A maximum number of shoot buds was induced on MS medium containing 10 mg/l Zea followed by 5 mg/l BAP in combination with 1 mg/l IAA. Rooting and elongation of the shoot buds were achieved on MS medium supplemented with 0.5 mg/l IAA or IBA. Axillary shoots were induced on the rooted plantlets by decapitation and the axillary shoot-tips explants were used for further induction of shoot buds by culturing them on a medium containing combinations of BAP with IAA. The shoot buds were rooted on a medium containing 0.5 mg/l IBA. The plantlets showed 80-90% survival during transplantation.
Sensibilidade, especificidade e valor preditivo da queixa auditiva  [cached]
Marini Ana Lúcia Sant'Anna,Halpern Ricardo,Aerts Denise
Revista de Saúde Pública , 2005,
Abstract: Objetivou-se verificar o valor preditivo, sensibilidade e especificidade das queixas auditivas de pacientes avaliados em clínica de fonoaudiologia de uma universidade. O estudo, de delineamento transversal, foi realizado em Canoas, RS, de 1998 a 2002. Foram analisados 795 indivíduos que realizaram o exame audiométrico. Os resultados mostraram que a queixa de perda auditiva apresentou sensibilidade de 80,9%, especificidade de 69,6%, valor preditivo positivo de 86,5% e negativo de 60,4%. O exame audiométrico é um exame confiável, apesar da sua subjetividade, devendo ser utilizado devido ao seu baixo custo em rela o às novas tecnologias.
An eQTL Analysis of Partial Resistance to Puccinia hordei in Barley  [PDF]
Xinwei Chen,Christine A. Hackett,Rients E. Niks,Peter E. Hedley,Clare Booth,Arnis Druka,Thierry C. Marcel,Anton Vels,Micha Bayer,Iain Milne,Jenny Morris,Luke Ramsay,David Marshall,Linda Cardle,Robbie Waugh
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0008598
Abstract: Genetic resistance to barley leaf rust caused by Puccinia hordei involves both R genes and quantitative trait loci. The R genes provide higher but less durable resistance than the quantitative trait loci. Consequently, exploring quantitative or partial resistance has become a favorable alternative for controlling disease. Four quantitative trait loci for partial resistance to leaf rust have been identified in the doubled haploid Steptoe (St)/Morex (Mx) mapping population. Further investigations are required to study the molecular mechanisms underpinning partial resistance and ultimately identify the causal genes.
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