Characterization of Phytophthora infestans populations of southern Brazil in 2004 and 2005

Santana, F. M.; Gomes, C. B.; Rombaldi, César Valmor; Bianchi, Valmor João; Reis, Ailton

doi:10.1007/s12600-013-0316-y

Cited by 9 publications

(6 citation statements)

References 28 publications

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“…The disease caused by the oomycete Phytophthora infestans (Mont.) de Bary is considered the most important disease of potato crop in all producing regions worldwide ( Santana et al., 2013 ; Göre et al., 2019 ).…”

Section: Resultsmentioning

confidence: 99%

“…The outbreaks caused by new isolates of the late blight oomycete Phytophthora infestans (Mont.) de Bary in Europe and the Americas ( Santana et al., 2013 ; Göre et al., 2019 ; Maurice et al., 2019 ), or by the new sequevars of bacterial wilt Ralstonia solanacearum found in Brazil, Peru and Iran ( Gutarra et al., 2017 ; Santiago et al., 2017 ; Sedighian et al., 2020 ) have the potential to destroy potato fields. Lack of resistance of the current potato cultivars to the main diseases that affect the crop makes it one of the most dependent crops on agrochemical applications ( Vleeshouwers et al., 2011 ).…”

Section: Introductionmentioning

confidence: 99%

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Solanum malmeanum, a promising wild relative for potato breeding

et al. 2023

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Crop wild relatives are gaining increasing attention. Their use in plant breeding is essential to broaden the genetic basis of crops as well as to meet industrial demands, for global food security and sustainable production. Solanum malmeanum (Solanum sect. Petota, Solanaceae) is a wild relative of potatoes (S. tuberosum) from Southern South America, occurring in Argentina, Brazil, Paraguay and Uruguay. This wild potato has been largely mistaken for or historically considered as conspecific with S. commersonii. Recently, it was reinstated at the species level. Retrieving information on its traits and applied uses is challenging, because the species name has not always been applied correctly and also because species circumscriptions and morphological criteria applied to recognize it have not been consistent. To overcome these difficulties, we performed a thorough literature reference survey, herbaria specimens’ identification revision and genebank database queries to review and update the information available on this potato wild relative, contributing to an increase in research on it to fully understand and explore its potential for potato breeding. Scarce studies have been carried out concerning its reproductive biology, resistance against pests and diseases as well as tolerance to abiotic stresses and evaluation of quality traits. The scattered information available makes it less represented in genebanks and genetic studies are missing. We compile, update and present available information for S. malmeanum on taxonomy, geographical distribution, ecology, reproductive biology, relationship with its closest relatives, biotic and abiotic stresses resistance and quality traits and discuss ways to overcome sexual barriers of hybridization and future perspectives for its use in potato breeding. As a final remark, we highlight that this species’ potential uses have been neglected and must be unlocked. Thus, further studies on morphological and genetic variability with molecular tools are fundamental for an efficient conservation and applied use of this promising genetic resource.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solanum malmeanum, a promising wild relative for potato breeding

et al. 2023

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“…Los resultados de la dosis media efectiva (EC 50 ) para este fungicida concuerdan con los reportados por Lagos ( 2002) al encontrar después de evaluar 63 aislamientos procedentes del Departamento de Nariño un 24% de reacción resistente. Dentro de las razones que expliquen la ausencia de poblaciones resistentes a metalaxil en este estudio, sean los cambios presentados en el ingrediente activo, ya que desde el año 2002 se ha distribuido en el mercado variantes dos veces más efectiva que el genérico conocido como Metalaxil -M. De igual manera, el uso intensivo de esta molécula para el control del tizón tardío en la zonas productoras de papa se ha visto reducida en virtud a la aparición de productos comerciales compuestos por nuevas mezclas que contienen fungicidas de tipo preventivo y curativo como Cimoxanil, Dimetomorf, Propamocarb o Estrobulinas (Santana et al, 2013) y que resultan eficientes en el control del patógeno generando una sustitución gradual del metalaxil. Lo que indica que en general, las zonas productoras de papa en el Departamento de Nariño no generan una fuerte presión de selección y que aún se puede considerar el uso de productos a base de Metalaxil en programas de manejo que controlen este patógeno.…”

Section: Discussionunclassified

Sensibilidad de aislamientos de Phytophthora infestans procedentes de Solanum tuberosum a tres fungicidas sistémicos

Chañag

Álvarez

Lagos

et al. 2018

Rev. Colomb. Cienc. Hortic.

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Phytophthora infestans, es el agente causal de una de las enfermedades más limitantes de cultivos de papa (Solanum tuberosum) en el departamento de Nariño causando que los agricultores utilicen de forma intensiva diferentes fungicidas, llegando a representar el 30% de los costos de producción, siendo un grave problema ambiental y de salud pública. El propósito de esta investigación es apoyar los programas de manejo integrado de enfermedades a partir de la generación de una línea base de sensibilidad de 20 aislamientos de P. infestans del departamento de Nariño frente a tres fungicidas sistémicos comerciales compuestos por Metalaxil 8% + Mancozeb 64%, Cimoxanil 6% + Propineb 70% y Fluopicolide 6% + Propineb 66,7%. Este estudio se llevó a cabo siguiendo la metodología in vitro utilizando cinco dosis basadas en una escala exponencial. Los resultados mostraron un comportamiento heterogéneo donde algunos aislamientos presentaron resistencia al fungicida compuesto por Metalaxil + Mancozeb, alcanzando valores promedio de EC50 de 6,67 µg mL-1, mientras que para los fungicidas compuestos por Cimoxanil + Propineb y Fluopicolide + Propineb se presentaron niveles de sensibilidad intermedia y sensibles con valores de EC50 promedio de 1,57 µg mL-1 y 2,61 µg mL-1. Por otra parte, la tasa de esporulación se redujo en su totalidad para los tres fungicidas cuando se evaluaron las dosis de 100, 1.000, 10.000 µg mL-1.

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“…Reports of Arafa et al [ 61 ] identified P. infestans mating type A1 using SSR markers in Egypt with seven genotypes among fourty isolates indicating genetic variability. According to Santana et al [ 62 ], 131 potato and 32 tomato isolates were evaluated where 59 isolates were classified as A1 mating type, while 103 were A2. All the tomato isolates that were of A1 mating type presented 86/100 pattern for the enzyme GPI and mtDNA Ib, indicating that the isolates belonged to the US-1 clonal lineage.…”

Section: Morphological and Molecular Diversity Of Phytophth...mentioning

confidence: 99%

Morphological and Molecular Variability of Alternaria solani and Phytophthora infestans Causing Tomato Blights

Mugao

2023

International Journal of Microbiology

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Alternaria solani and Phytophthora infestans cause early and late blight diseases in tomato and potato, respectively. A. solani can survive for more than a decade in the soil, seed, or in plant residues at optimum temperature. The pathogen exhibits high molecular and genetic variation between isolates from potato and tomato plants, in different countries. Morphological studies reveal separate conidia borne singly on simple conidiophores. Spores are elongated, muriform, beaked, septate, and dark coloured. The mycelia are branched and septate. A. solani demonstrated a high genetic variability among isolates originating from the United States, Greece, Cuba, Canada, Russia, Turkey, South Africa, Brazil, and China based on vegetative compatibility groups and molecular markers (random amplified polymorphic DNA markers, random amplified microsatellite markers, and amplified fragment length polymorphisms). Different morphological and molecular variations indicate the presence of variability among the isolates. On the other hand, P. infestans is a diploid, obligate, heterothallic, and biotrophic oomycete, whose asexual lifecycle is characterized by alternating phases of sporangia germination, hyphal growth, and sporulation. The mycelia of P. infestans is coenocytic, multinucleate, and aseptate although the cross walls do not form in old cultures. Sporangia are borne singly on the branch tips of the alternately branched sporangiophore. Sporangium is hyaline and lemon shaped with a papilla at the distal end. Mating types A1 and A2 with different clonal lineages have been discovered in various parts of the world indicating variation in the species.

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Characterization of Phytophthora infestans populations of southern Brazil in 2004 and 2005

Cited by 9 publications

References 28 publications

Solanum malmeanum, a promising wild relative for potato breeding

Solanum malmeanum, a promising wild relative for potato breeding

Sensibilidad de aislamientos de Phytophthora infestans procedentes de Solanum tuberosum a tres fungicidas sistémicos

Morphological and Molecular Variability of Alternaria solani and Phytophthora infestans Causing Tomato Blights

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