Fecha/hora: 07/06/2024 23:48:31

Biblioteca(s): 	INIA Las Brujas.	
Fecha corriente: 	21/02/2014	
Fecha de la última actualización: 	17/10/2019	
Autoria: 	FERREIRA, V.; PIANZZOLA, M.J.; VILARÓ, F.; GALVÁN, G.; TONDO, M.L.; RODRÍGUEZ, M.V.; ORELLANO, E.G.; VALSS, M.; SIRI, M.I.	
Afiliación: 	VIRGINIA FERREIRA, Departamento de Biociencias, Facultad de Química, Universidad de la República, Montevideo, Uruguay; MARÍA J. PIANZZOLA, Departamento de Biociencias, Facultad de Química, Universidad de la República, Montevideo, Uruguay; FRANCISCO LUIS VILARO PAREJA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; GUILLERMO GALVÁN, Departamento de Producción Vegetal, Centro Regional Sur, Facultad de Agronomía, Universidad de la República, Canelones, Uruguay; MARÍA L. TONDO, Instituto de Biología Molecular y Celular de Rosario (CONICET-UNR), Rosario, Argentina; Área Biología Molecular, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina; MARÍA V. RODRÍGUEZ, Área Biología Vegetal (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina; ELENA G. ORELLANO, Instituto de Biología Molecular y Celular de Rosario (CONICET-UNR), Rosario, Argentina; Área Biología Molecular, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario, Argentina; MARC VALSS, Center for Research in Agricultural Genomics, CSIC, IRTA, Barcelona, Spain; Department of Genetics, Universitat de Barcelona, Barcelona, Spain; MARÍA I. SIRI, Departamento de Biociencias, Facultad de Química, Universidad de la República, Montevideo, Uruguay.	
Título: 	Interspecific potato breeding lines display differential colonization patterns and induced defense responses after Ralstonia solanacearum infection.	
Año de publicación: 	2017	
Fuente/Imprenta: 	Frontiers in Plant Science, 28 August 2017, volume 8, 1424. OPEN ACCESS.	
ISSN: 	1664-462X	
DOI: 	10.3389/fpls.2017.01424	
Idioma: 	Inglés	
Notas: 	Article history: Received: 30 June 2017 / Accepted: 02 August 2017 / Published: 28 August 2017.	
Contenido: 	ABSTRACT.
Potato (Solanum tuberosum L.) is one of the main hosts of Ralstonia solanacearum, the causative agent of bacterial wilt. This plant pathogen bacteria produce asymptomatic latent infections that promote its global spread, hindering disease control. A potato breeding program is conducted in Uruguay based on the introgression of resistance from the wild native species S. commersonii Dun. Currently, several backcrosses were generated exploiting the high genetic variability of this wild species resulting in advanced interspecific breeding lines with different levels of bacterial wilt resistance. The overall aim of this work was to characterize the interaction of the improved potato germplasm with R. solanacearum. Potato clones with different responses to R. solanacearum were selected, and colonization, dissemination and multiplication patterns after infection were evaluated. A R. solanacearum strain belonging to the phylotype IIB-sequevar 1, with high aggressiveness on potato was genetically modified to constitutively generate fluorescence and luminescence from either the green fluorescence protein gene or lux operon. These reporter strains were used to allow a direct and precise visualization of fluorescent and luminescent cells in plant tissues by confocal microscopy and luminometry. Based on wilting scoring and detection of latent infections, the selected clones were classified as susceptible or tolerant, while no immune-like resistance response was identified. Typical wilting symptoms in susceptible plants were correlated with high concentrations of bacteria in roots and along the stems. Tolerant clones showed a colonization pattern restricted to roots and a limited number of xylem vessels only in the stem base. Results indicate that resistance in potato is achieved through restriction of bacterial invasion and multiplication inside plant tissues, particularly in stems. Tolerant plants were also characterized by induction of anatomical and biochemical changes after R. solanacearum infection, including hyperplasic activity of conductor tissue, tylose production, callose and lignin deposition, and accumulation of reactive oxygen species. This study highlights the potential of the identified tolerant interspecific potato clones as valuable genetic resources for potato-breeding programs and leads to a better understanding of resistance against R. solanacearum in potato. 
© 2017 Ferreira, Pianzzola, Vilaró, Galván, Tondo, Rodriguez, Orellano, Valls and Siri.	
Palabras-Clave: 	Bacterial wilt; Disease resistance; Latent infections; Plant breeding; Potato; Ralstonia solanacearum; Solanum commersonii.	
Categoría del tema: 	F01 Cultivo	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (12685-1) - PXI - AP - DD - PP/Front. Plant Sci/2017 -  -  - DIS