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5. Low water availability increases susceptibility to peanut smut (Thecaphora frezzii) in peanut crop.

Author

Paredes, Juan A., Guzzo, M. Carla, Monguillot, Joaquin H., Asinari, Florencia, Posada, Gisella A., Oddino, Claudio M., Giordano, Damian F., Morichetti, Sergio A., Torres, Adriana M., Rago, Alejandro M., and Monteoliva, Mariela I.

Subjects
WATER supply, PEANUTS, CROPS, GROWING season, DISEASE incidence, SOIL moisture
Abstract

Peanut smut (causal agent Thecaphora frezzii) and seasonal drought are the two main factors reducing peanut yields in Argentina. There are no previous studies about the effect of drought on peanut smut occurrence. We evaluated the effect of soil water limitation on smut symptoms in greenhouse and field assays. Additionally, we analysed the biochemical responses of plants to the combined stress caused by water limitation and smut infection in greenhouse experiments. We found that a moderate water deficit (30% of soil water‐holding capacity) increased smut symptoms and differentially increased proline and reduced chlorophylls in the host. Subsequently, we studied the correlation between field precipitation data and smut damage from 2015 to 2020 in naturally infected fields with a high T. frezzii spore load in the soils. Strong correlations between precipitation and severely affected pods, severity disease index and incidence were found from January to March (susceptibility window for T. frezzii infections). We suggest a strategy of irrigation in a specific time frame to mitigate smut damage when there is a water deficit in the growing season. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Low water availability increases susceptibility to peanut smut (Thecaphora frezzii) in peanut crop

Author

Paredes, Juan A., primary, Guzzo, M. Carla, additional, Monguillot, Joaquin H., additional, Asinari, Florencia, additional, Posada, Gisella A., additional, Oddino, Claudio M., additional, Giordano, Damian F., additional, Morichetti, Sergio A., additional, Torres, Adriana M., additional, Rago, Alejandro M., additional, and Monteoliva, Mariela I., additional

Published
2023
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13. Evolução da mancha preta do amendoim nas principais regiões produtoras da Argentina e do Brasil frente às mudanças no clima

Author

BISONARD, E. M., HAMADA, E., ANGELOTTI, F., GONÇALVES, R. R. do V., RAGO, A. M., Eduardo Matias Bisonard, INTA, EMILIA HAMADA, CNPMA, FRANCISLENE ANGELOTTI, CPATSA, Renata Ribeiro do Valle Gonçalves, UNICAMP, and Alejandro Mario Rago, INTA.

Subjects
Peanuts, Cercosporidiumpersonatum, Amendoim, Mancha Preta, Arachis hypogea, Plant diseases and disorders, Doença de Planta, Climate change, Geoprocessamento, Doença da planta, Doença, Mudança Climática
Abstract

A ocorrência da mancha preta do amendoim está diretamente relacionada com os elementos climáticos. Desta maneira, a elaboração de mapas de distribuição geográfica e temporal contribui informações sobre o comportamento de patossistemas frente às mudanças climáticas. Assim, o objetivo deste trabalho foi avaliar a evolução da favorabilidade climática à ocorrência da mancha preta para as principais regiões produtoras de amendoim da Argentina e do Brasil em função das mudanças climáticas. Na elaboração dos mapas foram consideradas as principais áreas produtoras de amendoim da Argentina e do Brasil e os meses de janeiro a março. Para a elaboração dos mapas foi empregada a metodologia de análise integrada das projeções climáticas e do problema fitossanitário com suporte do geoprocessamento. Foram considerados o clima normal (1961-1990) e o clima futuro (201-2040, 2041-270 e 2071-2100). Diferentes regras foram adotadas para cada a Argentina e o Brasil, pois elas incorporam as particularidades da doença nas áreas produtoras de cada país, como efeito da interação das características próprias do patógeno virulento, hospedeiro suscetível e ambiente. Os cenários climáticos futuros apontam o aumento da favorabilidade para a ocorrência da mancha preta do amendoim para a Argentina e para o Brasil. Made available in DSpace on 2020-11-11T11:23:37Z (GMT). No. of bitstreams: 1 Evolucao-da-mancha-preta-do-amendoim-nas-principais-regioes-2020.pdf: 1387315 bytes, checksum: 1732127f2cf730d076502b10d472a57c (MD5) Previous issue date: 2020

Published
2020

16. First Report of Orange Rust of Sugarcane Caused by Puccinia kuehnii in Argentina

Author

Funes, C., primary, Pérez Gómez, S. G., additional, Henriquez, D. D., additional, Di Pauli, V., additional, Bertani, R. P., additional, Fontana, D. P., additional, Rago, A. M., additional, Joya, C. M., additional, Sopena, R. A., additional, González, V., additional, Babi, H., additional, Erazzu, L. E., additional, Cuenya, M. I., additional, and Ploper, L. D., additional

Published
2016
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17. Avances en la investigación de la relación patogeno-hospedante y de la resistencia genética a enfermedades de la caña de azúcar en Argentina

Author

Mariotti, Jorge Alberto, Machado Assefh, Cristina Renata, Rech, G., Fontana, P. D., Collavino, N. G., Pocoví, M. I., Rago, A. M., and Daz, Mirta Elizabeth

Subjects
MARC ADORES MOLECULARES, CIENCIAS AGRÍCOLAS, Agricultura, purl.org/becyt/ford/4.1 [https], RESISTENCIA GENÉTICA, CAÑA DE AZÚCAR, Agricultura, Silvicultura y Pesca, DIVERSIDAD GENÉTICA, purl.org/becyt/ford/4 [https]
Abstract

Esta contribución presenta avances en la investigación de la variabilidad y resistencia genética con relación a “Roya marrón” y “Estría roja” de la caña de azúcar en Argentina. Resultados experimentales de la inoculación con roya en condiciones controladas permitieron postular que tanto la actividad peroxidasa basal como la tasa de su crecimiento con posterioridad a la infección serían mecanismos complementarios que favorecen la expresión de la resistencia a la enfermedad. También se investigó la diversidad molecular en poblaciones de roya con base en 538 marcadores AFLP a partir de muestreos en diferentes variedades y en una amplia faja de distribución de la enfermedad en el NOA. No se detectaron estructuras genéticas diferenciadas según orígenes, comportándose las diferentes poblaciones como una única gran población indiferenciada de uredosporos con alto grado de variabilidad genética intrínseca. Con relación a Estría roja se logró optimizar una técnica efectiva para el aislamiento, identificación y caracterización genética del agente responsable de la enfermedad. Los resultados obtenidos permitieron confirmar que Acidovorax avenae es el agente responsable de estría roja de la caña de azúcar en Argentina, siendo ésta la primera caracterización realizada en la región cañera para esta patología. Por otra parte el análisis de perfiles de REP-PCR y RAPD confirmó la presencia de al menos cuatro biotipos de la enfermedad en aislados de Salta y Tucumán. La existencia de diversidad genética entre aislamientos permite diseñar estrategias de control mediante el uso de variedades resistentes. The paper presents recent progress in the investigation of variability and genetic resistance in relation to Rust and Red stripe diseases of sugar cane in Argentina. Experimental results for rust innoculation under controlled conditions served to postulate that both basal peroxidase activity and its rate of increase after innoculation with the disease could be complementary mechanisms in the expression of resistance in different cultivars. Molecular diversity of rust populations collected in the field in North West Argentina were also investigated based on 538 AFLP markers. Samples collected in different varieties and sites indicated that rust uredospores populations correspond with a single mixed undifferentiated population with a high degree of intrinsic genetic variability. In regard to Red stripe it was possible to optimize an effective procedure for the isolation, identification and genetic characterization of the disease agent. Results permitted for the first time the identification of Acidovorax avenae as the agent responsible for the disease in Argentina. The profile analysis for REP-PC and RAPD indicated the presence of at least four different biotypes of the disease in Salta and Tucumán. The occurrence of genetic diversity among isolates permits the design of strategies for the control of the disease by means of resistant varieties. Fil: Mariotti, Jorge Alberto. Instituto Nacional de Tecnología Agropecuaria; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Machado Assefh, Cristina Renata. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Salta; Argentina Fil: Rech, G.. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina Fil: Fontana, P. D.. Instituto Nacional de Tecnología Agropecuaria; Argentina Fil: Collavino, N. G.. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina Fil: Pocoví, M. I.. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina Fil: Rago, A. M.. Instituto Nacional de Tecnología Agropecuaria; Argentina Fil: Daz, Mirta Elizabeth. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Salta; Argentina

Published
2011

18. Roya naranja de la caña de azúcar: análisis de su situación actual en el continente americano

Author

Funes, Claudia, Rago, Alejandro M., Perera, María Francisca, Pérez Gómez, Sergio G., Fernández de Ulivarri, Ricardo, and Cuenya, María Inés

Subjects
Otras Agricultura, Silvicultura y Pesca, CIENCIAS AGRÍCOLAS, purl.org/becyt/ford/4.1 [https], CAÑA DE AZÚCAR, AMÉRICA, Agricultura, Silvicultura y Pesca, purl.org/becyt/ford/4 [https]
Abstract

La roya naranja de la caña de azúcar, causada por el hongo Puccinia kuehnii, fue considerada histó- ricamente una enfermedad secundaria y, desde su descripción en 1890, estuvo limitada al sudeste asiático y Oceanía. Entre 2000 y 2001, esta enfermedad produjo pérdidas significativas en los cañaverales de Queensland (Australia) al atacar a Q124, por entonces la principal variedad comercial cultivada en esa región. En julio de 2007, su presencia fue constatada por primera vez en el continente americano, en el estado de Florida (EE.UU.), y desde allí se distribuyó a varios países de Centroamérica, México y Cuba. En diciembre de 2009 fue reportada en Brasil y en agosto de 2010 en Colombia, siendo los primeros países en Sudamérica en los cuales se confirmó la enfermedad hasta la fecha de redacción de este artículo (20 de septiembre de 2010). En el presente trabajo se resumen los principales antecedentes mundiales de esta enfermedad, analizándose la distribución actual en América y su probable impacto en la producción, relacionado con la reacción frente al patógeno de las variedades de caña de azúcar cultivadas en las zonas afectadas. Se describen además, la sintomatología y las condiciones ambientales predisponentes para el desarrollo de este patógeno. Fil: Funes, Claudia. Provincia de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial "Obispo Colombres" (p). Sección FitopatologÍa; Argentina Fil: Rago, Alejandro M.. Instituto Nacional de Tecnología Agropecuaria; Argentina Fil: Perera, María Francisca. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Provincia de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial "Obispo Colombres". Sección Biotecnología; Argentina Fil: Pérez Gómez, Sergio G.. Instituto Nacional de Tecnología Agropecuaria; Argentina Fil: Fernández de Ulivarri, Ricardo. Provincia de Salta. Ministerio de Asuntos Agrarios. Chacra Experimental Agrícola Colonia Santa Rosa; Argentina Fil: Cuenya, María Inés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Provincia de Tucumán. Ministerio de Desarrollo Productivo. Estación Experimental Agroindustrial "Obispo Colombres" (p). Programa de Mejoramiento Genético de Caña de Azúcar; Argentina

Published
2010

19. MOLECULAR DETECTION OF THECAPHORA FREZII IN PEANUT (ARACHIS HYPOGAEA L.) SEEDS.

Author

Cazón, I., Conforto, C., Fernández, F. D., Paredes, J. A., and Rago, A. M.

Subjects
THECATE hydroids, PLANT disease research, PEANUT diseases & pests, SURFACE contamination, POLYMERASE chain reaction
Abstract

Thecaphora frezii is the causal agent of peanut smut, important disease in the Argentine production area. The pathogen can be dispersed by kernels, through surface contamination or small lesions. The aim of this work was to design specific primers to develop a Polymerase Chain Reaction assay for the detection of Thecaphora frezii in peanuts kernels. The ITS region of four T. frezii isolates was amplified and sequenced. A consensus sequence was obtained and a pair of primers specific for the pathogen, named TF-2F and TF-2R, was synthesized. The primers were used for specificity and sensitivity tests. The former test involved a PCR using DNA from T. frezii and other seed-transmitted pathogens (S. rolfsi, S. minor, Fusarium solani and S. sclerotiorum). A 190 bp fragment was obtained for the T. frezii isolates, whereas no amplification was observed for the remaining pathogens. For the sensitivity test, positive results were observed at concentrations up to 3x10-4 pg of the target DNA. The specificity of this method, along with its sensitivity, makes it an important tool for epidemiological studies of peanut smut. [ABSTRACT FROM AUTHOR]

Published
2016

21. Consecration words

Author

Rago, Christine M.

Subjects
Philosophy and religion
Abstract

* I find it disturbing, frustrating and sad that this pope, Benedict XVI, should find it necessary to change the words 'for all' to 'for many' in the words of [...]

Published
2006

23. Reservoir Performance in Viscoelastic Porous Media

Author

Rago, F. M., Ohkuma, H., Sepehrnoori, K., and Thompson, T. W.

Abstract

The mass balance equations for a two-phase two-component fluid system are written for viscoelastic porous media. The resulting equations are approximated by finite differences and the resulting numerical simulator is used to conduct a sensitivity study on the effects of uniaxial viscoelastic deformation in geopressured aquifers. Results of this study indicate that viscoelastic deformation may have considerable influence on the pressure maintenance of these aquifers. A numerical model of the geopressured aquifer in Brazoria County, Texas, is constructed and the numerical simulator is used to predict the ultimate recovery of solution gas from this viscoelastic geopressured aquifer.

Published
1985
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24. LETTERS.

Author

Turlish, Maureen, Hoatson, Robert, Grenn, Stan, Carroll, Donald C., Rago, Christine M., Hockey, Kathleen P., Sheridan, Mary S., Doerr, Edd, Walker, David J., Gotvald, Mark, Lazzo, Janelle, and Van Coppenolle, John

Subjects
*LETTERS to the editor, *CHURCH polity, *LAY ministry, *CHRISTIANITY, *RELIGIONS
Abstract

Several letters to the editor are presented in response to articles in previous issues including "Conclusion on Limbo," by John L. Allen in the October 20, 2006 issue, "Laity Must Not Purify Vessels," in the November 3, 2006 issue, and "Talking Sense About a New 'Lost' Generation," by Raymond Schroth in the December 15, 2006 issue.

Published
2006

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