Abstract Soybean ( Glycine max [L.] Merr.) productivity is frequently compromised by soil-borne pathogens. Macrophomina phaseolina (Mp), the causal agent of charcoal rot, can produce important soybean yield losses especially when hot and dry weather prevails. Integrating biological control agents with chemical seed treatments represents a promising strategy for improving disease management. This study aimed to (i) assess the in vitro compatibility of Trichoderma koningiopsis with commercial fungicide seed treatments, and (ii) evaluate the field performance of T. koningiopsis , alone or combined with compatible fungicides, across three soybean growing seasons. Compatibility assays revealed fungicide-specific effects, with Acronis® classified as non-fungitoxic and Topseed Extra as moderately fungitoxic. Across field seasons, Mp inoculation reduced seedling emergence, while several seed treatments improved emergence compared to the inoculated control, however, treatment effects varied markedly among years. Disease severity did not differ significantly among treatments in any season, and yield responses were strongly modified by environmental conditions rather than treatment effects. Temperature-response assays showed that T. koningiopsis exhibited optimal growth between 28 to 30°C and complete inhibition above 40°C, indicating high thermal sensitivity. The results demonstrate that T. koningiopsis can be integrated with compatible fungicides and may enhance early stand establishment under favorable conditions, but its field performance is strongly limited by high temperatures. These findings highlight the importance of environmental conditions when biological seed treatments are used.

The efficacy of Azospirillum argentinense REC3, applied by seed inoculation, in enhancing soybean (Glycine max [L.] Merr.) nodulation with native rhizobia, improving grain yield, and protecting against Fusarium fungi was studied. In La Cruz, Tucum & aacute;n, Argentina, 23 fungal isolates were identified as F. oxysporum (2 strains), F. solani (2), and F. tucumaniae (19). Following soil infestation, only F. tucumaniae was confirmed as a phytopathogen, with REC3 inhibiting its mycelial growth. Greenhouse trials, for a duration of 30 days, showed significant reductions in disease severity (78.2%), root rot (32.3%), and disease incidence (50.9%) in plants susceptible to sudden death syndrome (SDS) when REC3 was applied. Field experiments (2018-2019; January-April) under drought stress conditions, displayed increased nodulation (37.2%) and grain yield (2077 +/- 272.8 kg ha(-1), p < 0.05) in REC3-treated plants compared to controls (1516 +/- 272.8 kg ha(-1), p < 0.05). Additionally, a low disease incidence (0.90%) was observed only in the SDS-susceptible soybean variety without REC3 treatment. Overall, the findings showed the significant potential of REC3 inoculation as a biotechnological strategy for enhancing agricultural productivity, managing diseases, and improving crop resilience under challenging environmental conditions. This integrated approach, combining the use of a partially SDS-resistant soybean variety with REC3 inoculation, showed promise in protecting soybean cultivation against SDS and other fungal diseases, thereby ensuring more sustainable and resilient agricultural practices.

Macrophomina phaseolina (Tassi) Goid. (Mp) is the causal agent of charcoal rot in soybean, an economically serious and potentially destructive disease. Chemical control sometimes has limited effects on disease severity and may pose a threat to the environment, so the use of Trichoderma as a biological product could be a feasible alternative for charcoal rot management. The objective of this research was to isolate and characterize native Trichoderma spp. from northwestern Argentina and study their antagonistic effect against Mp in soybean. Isolations were performed from soil samples followed by cultural and microbiological characterization of the Trichoderma spp. isolates collected. Then, the antagonist effect against Mp was studied in vitro, under greenhouse conditions, and finally under field conditions with pathogen artificial inoculations during two soybean crop seasons (2020 and 2021). The results demonstrated that isolate Tr009 had a biocontrol effect against Mp in soybean. This control was evidenced in vitro and under controlled and field conditions with high emergency of plants compared to the Mp inoculated control. Under field conditions, treatments that included Trichoderma presented lower disease severity, colony-forming unit index and disease severity index values than the pathogen inoculated control. Moreover, Tr009 improved weight and length of soybean plants under greenhouse conditions. Isolate Tr009 was identified as Trichoderma koningiopsis by molecular methods. These results indicate that this biological tool can be used against Mp and thus favor a sustainable management of soybean charcoal rot.

Soybean target spot, caused by the fungus Corynespora cassiicola, is an important disease in northwestern Argentina (NWA). A cultural, morphological, and virulence characterization of 24 C. cassiicola isolates from different geographic localities in NWA was performed. The isolates were classified into five different cultural phenotypes, one of which has not been previously described. The ribosomal DNA internal transcribed spacer region sequence from five representative isolates (587 bp) exhibited 100% identity with C. cassiicola. A high variability of conidial morphology was observed among isolates, but no correlation with cultural phenotype was observed. When the soybean cultivar A 8000 RG was challenged with the 24 isolates, different degrees of virulence were observed, ranging from highly virulent to nonvirulent. No association of virulence with cultural or morphological characters was observed, but a relationship with geographical origin was demonstrated. Histopathological studies were performed on a nonvirulent and a highly virulent isolate. Microscopic observations of infected tissues of the former showed low mycelium development restricted to the upper epidermis, a thickening of the cuticle and primary wall of subepidermal cells, and accumulation of callose in phloematic vessels. In tissue infected with the latter, there was abundant mycelium development accompanied by cellular disorganization in mesophyll cells. Pathological challenges of isolates on nine different cultivars indicated that the degree of virulence of isolates depends on the plant genotype, demonstrating that the C. cassiicola-soybean interaction is highly specific. Understanding the genetic basis of this interaction will provide new information for better disease management and breeding strategies.

Key message This review provides a comprehensive atlas of QTLs, genes, and alleles conferring resistance to 28 important diseases in all major soybean production regions in the world. Abstract Breeding disease-resistant soybean [ Glycine max (L.) Merr.] varieties is a common goal for soybean breeding programs to ensure the sustainability and growth of soybean production worldwide. However, due to global climate change, soybean breeders are facing strong challenges to defeat diseases. Marker-assisted selection and genomic selection have been demonstrated to be successful methods in quickly integrating vertical resistance or horizontal resistance into improved soybean varieties, where vertical resistance refers to R genes and major effect QTLs, and horizontal resistance is a combination of major and minor effect genes or QTLs. This review summarized more than 800 resistant loci/alleles and their tightly linked markers for 28 soybean diseases worldwide, caused by nematodes, oomycetes, fungi, bacteria, and viruses. The major breakthroughs in the discovery of disease resistance gene atlas of soybean were also emphasized which include: (1) identification and characterization of vertical resistance genes reside rhg1 and Rhg4 for soybean cyst nematode, and exploration of the underlying regulation mechanisms through copy number variation and (2) map-based cloning and characterization of Rps11 conferring resistance to 80% isolates of Phytophthora sojae across the USA. In this review, we also highlight the validated QTLs in overlapping genomic regions from at least two studies and applied a consistent naming nomenclature for these QTLs. Our review provides a comprehensive summary of important resistant genes/QTLs and can be used as a toolbox for soybean improvement. Finally, the summarized genetic knowledge sheds light on future directions of accelerated soybean breeding and translational genomics studies.

El Proyecto Legumbres Secas de la Estación Experimental Agroindustrial Obispo Colombres ha desarrollado una nueva variedad de garbanzo (Cicer arietinum L.) tipo Desi, denominada TUC 450, primera en este acervo genético para registrar en la Argentina. Con el objetivo de inscribirla en el Registro Nacional de Cultivares (RNC) y el Registro Nacional de Propiedad de Cultivares (RNPC) se realizó la descripción de caracteres morfológicos, fenológicos y comportamiento sanitario sobre plantas provenientes de un ensayo ubicado en la localidad de La Ramada, departamento Burruyacú, provincia de Tucumán. Los caracteres presentados en este trabajo son requisitos obligatorios para la inscripción de la nueva variedad y permitirán distinguirla entre otras similares.

Durante las últimas décadas, el cultivo de la soja a nivel mundial tuvo un crecimiento tanto en superficie como en productividad. En la Argentina sucedió de igual manera, particularmente a comienzos de este siglo, como resultante del uso de alta tecnología, convirtiendo a este cultivo y los subproductos que de él se obtienen en el pilar del sistema granario y exportador. El desarrollo del noroeste argentino (NOA) coincidió con el proceso a nivel nacional. La Estación Experimental Agroindustrial Obispo Colombres (EEAOC) de Tucumán buscó permanentemente producir cultivares adaptados a esta zona, siendo este el principal objetivo del subprograma Mejoramiento Genético del Proyecto Soja. Tarpusqa RR es una nueva variedad de soja liberada por la EEAOC, que completa su madurez fisiológica a los 117 días de la siembra (pertenece al grupo de madurez VII) con excelentes potenciales de rendimiento. Fue obtenida a través de cruzamiento y posterior avance generacional en la subestación de Monte Redondo (San Agustín, Tucumán). Tarpusqa RR fue sometida a ensayos comparativos de rendimiento (ECR) en tres diferentes sitios del área sojera tucumana durante las campañas 2008/2009 y 2009/2010, alcanzando rendimientos superiores a los testigos en la mayoría de los ensayos. Exhibe, entre otras características, baja o nula dehiscencia de vainas y un peso de 1000 semillas de 153 gramos. En cuanto a la sanidad, se destaca su resistencia a las enfermedades cancro del tallo y mancha ojo de rana, así como ante patógenos de semillas como Cercospora kikuchii y Fusarium spp.

Fil: Reznikov, Sebastian. Provincia de Tucuman. Ministerio de Desarrollo Productivo. Estacion Experimental Agroindustrial Obispo Colombres (P); Argentina

La podredumbre carbonosa de la soja [Glycine max (L.) Merr.], ocasionada por el hongo polífago Macrophomina phaseolina (Tassi) Goid., es una enfermedad que ocasiona pérdidas económicamente importantes en el mundo. En el noroeste de Argentina esta patología es limitante para la producción de soja cuando se presentan condiciones de altas temperaturas y estrés hídrico. Debido a la importancia económica y a la falta de genotipos comerciales de soja resistentes a esta enfermedad, se planteó como objetivo evaluar el comportamiento de las líneas avanzadas de soja del programa de mejoramiento genético de la Estación Experimental Agroindustial Obispo Colombres (EEAOC) frente a la podredumbre carbonosa, en ensayos a campo inoculados con el hongo. Se evaluaron los parámetros de severidad e índice de unidades formadoras de colonias de M. phaseolina (IUFC) en estadio fenológico R7 del cultivo. Se evaluaron 12 líneas de soja en la campaña 2016/2017 y 24 líneas en el ciclo agrícola 2017/2018. Las líneas que presentaron los mejores comportamientos frente a M. phaseolina en los ciclos agrícolas evaluados fueron: D38M3-13/182, D51N59-14/247 y Munasqa RR, las cuales se comportaron como moderadamente resistentes cuando se evaluó el parámetro severidad, y como resistentes según el parámetro IUFC. Estas líneas podrían ser utilizadas en los programas de mejoramiento genético como progenitores para incorporar la resistencia frente a esta enfermedad, y mejorar así el manejo de la podredumbre carbonosa de la soja en el noroeste de Argentina de forma eficaz y amigable con el ambiente.

La Argentina siembra y exporta garbanzo tipo Kabuli; sin embargo, a nivel mundial el tipo Desi representa el 85% de la producción total de garbanzo. Estos tipos difieren en una serie de características morfológicas y agronómicas, tolerancia al frío, resistencia a la rabia y hábito de crecimiento erecto son más frecuentes en los garbanzos tipo Kabuli; en cambio, los tipos Desi suelen presentar tolerancia a las altas temperaturas y a la sequía, resistencia a Fusarium spp. y precocidad. La necesidad de diversificar la producción de garbanzo en la Argentina llevó al Proyecto Legumbres Secas de la Estación Experimental Agroindustrial Obispo Colombres (EEAOC) a introducir genotipos de garbanzo Desi desde dos centros internacionales de investigación. Así, en el año 2009 la EEAOC recibió líneas avanzadas desde el International Center for Agriculture Research in the Dry Areas (ICARDA), y en 2015 desde el Australian Grains Genebank (AGG), las que fueron sembradas en la localidad de La Ramada, provincia de Tucumán, para su evaluación y selección. Durante los años 2016 a 2018 se evaluaron las líneas seleccionadas en Ensayos Comparativos de Rendimiento (ECR) en La Ramada y en el año 2018 se incorporó la localidad de Metán, provincia de Salta. Se evaluaron parámetros como número de días a floración, número de días a madurez fisiológica, porte a cosecha, color de grano, peso de semillas y rendimientos. Los resultados obtenidos posibilitaron la identificación y selección de una línea con características destacadas, lo que justificó su inscripción ante el Registro Nacional de Cultivares y el Registro Nacional de Propiedad de Cultivares como una nueva variedad de garbanzo tipo Desi a la que se le asignó el nombre de TUC 450.

HomePlant DiseaseVol. 103, No. 5First Report of ‘Candidatus Liberibacter asiaticus’ and Its Vector Diaphorina citri in Murraya paniculata in Santiago del Estero Province, Argentina PreviousNext DISEASE NOTES OPENOpen Access licenseFirst Report of ‘Candidatus Liberibacter asiaticus’ and Its Vector Diaphorina citri in Murraya paniculata in Santiago del Estero Province, ArgentinaG. M. Fogliata, C. V. Martínez, M. E. Acosta, A. A. Rojas, M. L. Muñoz, and L. D. PloperG. M. Fogliata†Corresponding author: G. M. Fogliata; E-mail: E-mail Address: gfogliata@eeaoc.org.arhttp://orcid.org/0000-0003-2157-8728Estación Experimental Agroindustrial Obispo Colombres, Las Talitas C.P. T4101XAC, Tucumán, ArgentinaSearch for more papers by this author, C. V. MartínezEstación Experimental Agroindustrial Obispo Colombres, Las Talitas C.P. T4101XAC, Tucumán, ArgentinaSearch for more papers by this author, M. E. AcostaEstación Experimental Agroindustrial Obispo Colombres, Las Talitas C.P. T4101XAC, Tucumán, ArgentinaSearch for more papers by this author, A. A. RojasEstación Experimental Agroindustrial Obispo Colombres, Las Talitas C.P. T4101XAC, Tucumán, ArgentinaSearch for more papers by this author, M. L. MuñozEstación Experimental Agroindustrial Obispo Colombres, Las Talitas C.P. T4101XAC, Tucumán, ArgentinaSearch for more papers by this author, and L. D. PloperEstación Experimental Agroindustrial Obispo Colombres, Las Talitas C.P. T4101XAC, Tucumán, ArgentinaSearch for more papers by this authorAffiliationsAuthors and Affiliations G. M. Fogliata † C. V. Martínez M. E. Acosta A. A. Rojas M. L. Muñoz L. D. Ploper Estación Experimental Agroindustrial Obispo Colombres, Las Talitas C.P. T4101XAC, Tucumán, Argentina Published Online:26 Feb 2019https://doi.org/10.1094/PDIS-06-18-0942-PDNAboutSections ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmailWechat ‘Candidatus Liberibacter asiaticus’ is one of the bacterial species associated with Huanglongbing (HLB), a severe citrus disease that causes major losses worldwide. It is transmitted by the psyllid Diaphorina citri. HLB can also affect Murraya paniculata, an ornamental plant common in sidewalks and home yards. In Argentina, the first detection of HLB was on citrus plants in Misiones province in 2012, and it has since been detected in other provinces of northeastern Argentina (Badaracco et al. 2017). HLB also represents a menace to the other important citrus growing region of Argentina, the Northwest (NWA), which produces 56% of the citrus of the country in the provinces of Tucumán (1,400,000 t per year, mainly lemon), Salta (323,000 t), Jujuy (257,000 t), Catamarca (9,000 t), and Santiago del Estero (only in backyard and urban areas). In 2005, the Estación Experimental Agroindustrial Obispo Colombres (EEAOC) started monitoring and analyzing samples from commercial citrus fields, urban areas, and nurseries from NWA. Since 2009, the EEAOC participates in the National HLB Prevention Program, coordinated by the federal phytosanitary agency Servicio Nacional de Sanidad y Calidad Agroalimentaria (Senasa). To date, 48 locations in NWA have been visually inspected, and leaf samples displaying HLB-type symptoms and psyllid samples were collected. A total of 12,462 samples were analyzed by real-time polymerase chain reaction (PCR) (Li et al. 2006); 51% corresponded to citrus and 4% to M. paniculata from the five provinces of NWA, and 45% to D. citri from Salta and Jujuy, all with negative results. In July 2017, Senasa personnel detected in the urban area of La Banda city in Santiago del Estero a M. paniculata tree with chlorotic branches that presented only a few leaves showing blotchy mottle and yellow midrib. During this inspection, the psyllid was also detected for the first time in Santiago del Estero province. Immediately, insect and leaf samples were submitted to the EEAOC laboratory for analysis. Total DNA was extracted from 500 mg of petiole and midrib tissue from leaves and from five adult insects using a modified cetyltrimethylammonium bromide method and analyzed with real-time PCR. All the psyllid samples were negative. The plant sample analyzed produced a threshold cycle (Ct) value of 26.31 (positive range). The presence of ‘Ca. L. asiaticus’ in M. paniculata was confirmed by nested real-time PCR (Lin et al. 2010) and conventional PCR, as well as by the sequence of its partial 16S rRNA. Sequences were PCR-amplified using specific primers OI1 and OI2c for the Asian form (Jagoueix et al. 1996). BLAST analysis of the sequence obtained showed a 99% identity with the sequence of the organism ‘Ca. L. asiaticus’ (GenBank accession no. CP019958.1). The positive plant was eradicated, and additional actions included in the program to prevent the spread of HLB in NWA were taken. Furthermore, actions are being implemented to avoid entry of the psyllid from Salta, Jujuy, and Santiago del Estero into Tucumán and Catamarca, where the insect has not yet been detected. To date, there have been no additional positive detections in plant or insect samples from NWA. Symptoms observed in negative samples could be attributed to other causes such as nutritional deficiencies or other pests. To our knowledge, this is the first report of ‘Ca. L. asiaticus’ in Santiago del Estero province, in an urban area located approximately 150 km from the closest citrus growing areas in Tucumán province, the world’s main producer and processor of lemon and one of the main exporters of lemon fresh fruits.References:Badaracco, A., et al. 2017. Australas. Plant Pathol. 46:171. https://doi.org/10.1007/s13313-017-0473-4 Crossref, ISI, Google ScholarJagoueix, S., et al. 1996. Mol. Cell. Probes 10:43. https://doi.org/10.1006/mcpr.1996.0006 Crossref, ISI, Google ScholarLi, W., et al. 2006. J. Microbiol. Methods 66:104. https://doi.org/10.1016/j.mimet.2005.10.018 Crossref, ISI, Google ScholarLin, H., et al. 2010. J. Microbiol. Methods 81:17. https://doi.org/10.1016/j.mimet.2010.01.014 Crossref, ISI, Google ScholarDetailsFiguresLiterature CitedRelated Vol. 103, No. 5 May 2019SubscribeISSN:0191-2917e-ISSN:1943-7692 DownloadCaptionTomato leaves infected with Tomato chlorotic dwarf viroid (Olmedo-Velarde, Roy, Belanger, Watanabe, Hamasaki, Mavrodieva, Nakhla, and Melzer). Photo credit: M. J. Melzer. Spinach plants with downy mildew symptoms caused by Peronospora effusa (Kandel, Mou, Shishkoff, Shi, Subbarao, and Klosterman). Photo credit: S. L. Kandel. Metrics Article History Issue Date: 8 May 2019Published: 26 Feb 2019Accepted: 3 Nov 2018 Pages: 1014-1014 Information© 2019 The American Phytopathological Society

Diseases are among the main factors that reduce soybean yields in Tucuman and other provinces in northwestern Argentina. The main diseases that affect the foliage of soybean plants in this region are target spot (caused by Corynespora cassiicola), Cercospora leaf blight (Cercospora kikuchii), and Asian soybean rust (Phakopsora pachyrhizi). The objective of this work was to evaluate the efficacy and application timing of different chemical fungicides for the management of these diseases in northwestern Argentina. Field trials were conducted during three growing seasons (2014/2015, 2015/2016, and 2016/2017). The fungicide treatments that presented statistical differences (P < 0.05) for target spot control compared to the untreated control in all growing seasons were those that included pyraclostrobin + epoxiconazole + fluxapyroxad (applied at R3, R5 and R3 + R5) and pyraclostrobin + epoxiconazole and azoxystrobin + cyproconazole at R3. For Cercospora leaf blight control, all treatments differed statistically from the untreated control in the 2014/2015 crop season, except for azoxystrobin + cyproconazole and azoxystrobin + benzovindiflupyr applied at R3 and pyraclostrobin + epoxiconazole at R5. Only azoxystrobin + cyproconazole at R3 in 2015/2016 and all the fungicide treatments in 2016/2017 differed statistically from the untreated controls. Soybean rust severity at R6 was low, 1.0% and 3.0% in the untreated control during 2014/2015 and 2015/2016, respectively, but increased to 54.2% in 2016/2017. Treatments that showed the lowest soybean rust severity values in the latter season were pyraclostrobin + epoxiconazole + fluxapyroxad (R3 + R5 and R5, with 17.4 and 17.1%, respectively), and azoxystrobin + benzovindiflupyr (R3 and R5, with 20.2 and 15.0%, respectively). Overall in this season, the efficacy of each fungicide for ASR control was better when applied at R5 than at R3. The treatments pyraclostrobin + epoxiconazole + fluxapyroxad applied at R3, R5 and R3+ R5 and treatments azoxystrobin + benzovindiflupyr and pyraclostrobin + epoxiconazole at R5 yielded significantly higher than the untreated control during all three seasons. These results should help improve management of soybean foliar diseases in northwestern Argentina.

El proyecto Legumbres Secas de la Estación Experimental Agroindustrial Obispo Colombres ha desarrollado una nueva variedad de garbanzo (Cicer arietinum L.), tipo Kabuli de calibre grande, denominada TUC G-470. Con el objetivo de inscribir la nueva variedad en el Registro Nacional de Cultivares (RNC) y el Registro Nacional de Propiedad de Cultivares (RNPC), se realizó la descripción de caracteres morfológicos, fenológicos y comportamiento sanitario. Las evaluaciones se efectuaron sobre plantas provenientes de un ensayo ubicado en la localidad de La Ramada, departamento Burruyacú, provincia de Tucumán. Los caracteres presentados en este trabajo son obligatorios para la inscripción de la nueva variedad y permiten distinguirla entre otras similares.

Soybean stem canker (SSC) is caused by two varieties of the fungus Diaporthe phaseolorum : var. meridionalis ( Dpm ) and var. caulivora ( Dpc ). The objective was to identify and characterize the mode of inheritance of Rdc genes through a classical Mendelian analysis. Resistant (R) and susceptible (S) genotypes were used to make 288 RxS and 132 RxR crosses, including their reciprocals. Segregating F 2 generations were obtained by self-fertilization of the respective F 1 . The incorporation of codominant molecular markers (Single Nucleotide Polymorphism, SNP) allowed the molecular validation of 48.75% of F 1 heterozygous individuals. Parents (R and S), F 1 individuals, and F 2:3 families (Progeny Test, PT) from COD 1–258-2 population were inoculated with an isolate of Dpc ( Dpc 16), previously identified morphologically and molecularly. The assay showed 21 F 2:3 families categorized as R, 42 segregated R and S, and 11 as S. Particularly, this F 3 population showed 466 individuals R and 274 S. The chi-square goodness of fit test verified that phenotypic segregation for individual plants in F 3 adjusted to a 5:3 ratio (R:S) and the PT results corresponded to the genotypic ratios (1RR: 2Rr: 1rr) of F 2 individuals. Results allowed the identification of a major resistance gene of simple Mendelian inheritance to SSC that was named Rdc1 . Also, independent segregation 9:3:3:1 was verified between this Rdc1 gene and the gene that regulates flower colour, a typical phenotypic marker in soybean. Based on literature review, this is the first report on resistance genes ( Rdc ) identified for SSC caused by Dpc .

El cultivo de poroto blanco (Phaseolus vulgaris L.) en la Argentina tiene importancia por su produccion del tipo alubia, del cual es primer exportador mundial y consecuentemente formador de precios. Una caracteristica del mercado de este tipo de poroto es que incluye distintas clases comerciales: Alubia (alargado), Great Northern (mediano, redondo) y Navybean (grano pequeno). El mejoramiento genetico de Navy bean se realiza casi exclusivamente en Michigan, Estados Unidos. El objetivo de este trabajo es presentar la nueva variedad de poroto blanco tipo Navy bean, TUC 150, obtenida por el Proyecto Legumbres Secas de la Estacion Experimental Agroindustrial Obispo Colombres (EEAOC). En el ano 2008 se realizaron cruzamientos en invernaculo y los progenitores fueron tres, todos provenientes del Centro Internacional de Agricultura Tropical (CIAT, Cali, Colombia). Una vez obtenidas las cruzas se realizo el avance generacional desde el ano 2009 hasta el 2012, haciendo dos siembras en el ano hasta llegar a estabilizar las lineas. Los procesos de seleccion, que se realizaron durante el avance generacional de F2 a F4, fueron individual y masal. Los parametros tenidos en cuenta fueron uniformidad, rendimiento, calidad de grano, reaccion a enfermedades y ciclo. La evaluacion y multiplicacion de las lineas estabilizadas se realizo durante el ano 2013 en la localidad de San Agustin (SA), Tucuman, donde se selecciono la linea que se denomino TUC 150. En el ano 2014 se inicio la evaluacion de TUC 150 en Ensayos Comparativos de Rendimiento (ECR) para sequia (por ser uno de sus progenitores resistente a sequia), conformado por seis lineas de poroto negro, dos de rojo y una de blanco. El ECR fue evaluado en dos localidades, SA y Pozo Hondo (PH), Santiago del Estero. Los anos de evaluacion fueron 2014, 2015 y 2017. Como resultado se decidio la inscripcion de TUC 150 como una nueva variedad tipo Navy bean, de habito de crecimiento IIa, de tallo firme, adaptado a la trilla directa y de buen comportamiento sanitario. Su tipo de grano, blanco brillante, le confiere una excelente calidad comercial. ABSTRACT TUC 150: first white bean variety, navy bean type, released by the Estacion Experimental Agroindustrial Obispo Colombres from Tucuman, Argentina White bean (Phaseolus vulgaris L.) in Argentina is important because of the production of the alubia type, of which it is the main world exporter. One of the characteristics of the white bean market is that it includes different commercial types: Alubia (elongated grain) Great Northern (rounded, mid-size grain) and Navy bean (small grain); genetic improvement of the latter is done almost exclusively in Michigan, U.S.A. The objective of this publication is to present TUC 150, a new white bean variety, Navy bean type, obtained by the Dry Legumes Project of the Estacion Experimental Agroindustrial Obispo Colombres (EEAOC). In 2008, crosses were made in the greenhouse; three parents were used, all of them had come from the Centro Internacional de Agricultura Tropical (CIAT, Cali, Colombia). Once the crosses were obtained, generations were advanced from 2009 through 2012, with two plantings per year, until lines were stabilized. The selection processes, carried out during the generation advance from F2 through F4, were individual and mass selection. The parameters evaluated were uniformity, yield, grain quality, and cycle. The evaluation and increase of the stabilized lines was performed in 2013 in the location of San Agustin (SA), Tucuman, where one line was selected and denominated TUC 150. In 2014, TUC 150 was included in the Comparative Yield Trials (CYT) for drought (since one of its parents was tolerant to drought), which also included six lines of black bean and two of red bean. The CYT was evaluated during 2014, 2015, and 2017 at two locations, SA and Pozo Hondo(PH), Santiago del Estero. Based on the results, it was decided that TUC 150 be officially registered as a new Navy bean cultivar, with IIa growth habit, firm stem, adaptation to direct harvest, and good reaction to diseases. Its excellent commercial quality is mainly due to its bright white grain.