Roya asiática de la Soja (Phakopsora pachyrhizi)

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Condición fitosanitaria: Presente solo en algunas áreas del país

Grupo de cultivos: Oleaginosas

Especie hospedante: Soja (Glycine max)

Rango de hospedantes: amplio rango de hospedantes alternativos o secundarios (roya atípica). En el campo, P. pachyrhizi infecta el tejido foliar de un amplio rango de leguminosas (al menos 31 especies en 17 géneros). La infección de 60 especies adicionales en otros géneros se ha logrado en condiciones de laboratorio (Goellner et al., 2010; Gupta et al., 2022). En total, se sabe que infecta a más de 95 especies de más de 42 géneros (Slaminko et al., 2008; Bettgenhaeuser et al., 2014).

Epidemiología: policíclica, subaguda.

Ciclo: no se conoce ningún hospedante intermediario. Las basidiosporas no pueden infectar la soja.

Etiología: Hongo. Biotrófico

Agente causal: Phakopsora pachyrhizi  Sydow & P. Sydow, 1914

Taxonomía: Eukaryota > Fungi > Dikarya > Basidiomycota > Pucciniomycotina > Pucciniomycetes > Pucciniales > Phakopsoraceae > Phakopsora

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Antecedentes

En América del Sur se encuentra en Paraguay, Brasil, Bolivia, Colombia, Uruguay, y en el NEA y NOA de la Argentina. Su importancia relativa, potencial muy elevada. Debido al tamaño pequeño (0,5 mm2) de las lesiones necróticas resulta muy difícil la detección a simple vista. La presencia de las pústulas es un indicio certero de la presencia de la enfermedad. Para la observación de sus pústulas se requiere una lupa de 20 aumentos o superior.

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Síntomas y signos

Las hojas son los órganos más frecuentemente afectados por esta enfermedad. Inicialmente, se manifiesta mediante diminutas lesiones o manchas puntiformes de color grisáceo a amarillento, ocultas en las hojas inferiores, fundamentalmente en el haz. Luego, estos puntos restringidos por las nervaduras, oscurecen adquiriendo una forma poligonal y angular. Se transforman en lesiones necróticas que son fácilmente confundibles con las causadas por otras enfermedades como mancha marrón, tizón y pústula bacteriana. La observación de estos síntomas es más frecuente en la parte basal del cultivo que en la superior. El amarilleo de las hojas inferiores (a veces de aspecto de “mosaico”), también es un síntoma clave a tener en cuenta para comenzar la observación. En condiciones óptimas para el desarrollo de la enfermedad, la sintomatología descripta es acompañada por una intensa defoliación que comienza por las hojas inferiores.

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Condiciones predisponentes para el establecimiento de la enfermedad

El período crítico se sitúa entre los 15 y 28 ºC, humedad relativa elevada (80%), y períodos de mojado foliar de 6 horas como mínimo.

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Ciclo de la enfermedad

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Epidemiología

Esta enfermedad no es una roya típica, ya que a diferencia de la mayoría de las royas (recordar por ej., las  royas específicas de los cereales cuyas pústulas son anaranjadas o amarillas y no generan manchas), la RAS presenta lesiones necróticas, no genera fructificaciones de color vistoso, no es específica de la soja, puede causar intensa defoliación y en su comienzo es de difícil diagnóstico. Al igual que otras royas, la RAS, se disemina muy eficientemente por el viento (Belinelli et al., 2022) y no puede sobrevivir en semilla o rastrojo, por lo cual su manejo es muy diferente al de las EFC (enfermedades de fin de ciclo de la soja). En Argentina sobrevive en plantas voluntarias o guachas de soja y en el kudzu (Pueraria montana var. lobata (Willd.) Sanjappa & Pradeep), planta perenne de la familia botánica de la soja, que crece principalmente en Misiones.

Phakopsora pachyrizi ingresa a la hoja penetrando directamente en la epidermis de la planta y, en este caso, la hidrofobicidad o las señales de cera juegan un papel en la inducción de estructuras previas a la penetración, en lugar del tigmotropismo (Uppalapati et al., 2012; Ishiga et al., 2013).

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Manejo Integrado

Actualmente no existen variedades de soja resistentes a la roya.

Es importante capacitarse en el reconocimiento y monitoreo de la enfermedad, eliminar plantas guachas. Las medidas preferenciales de manejo son: siembra de variedades de ciclos cortos, manejo de plantas guachas, monitoreo sistemático y control químico.

El monitoreo es la clave del manejo de esta enfermedad. Sugerencias para llevarlo a cabo eficientemente: recorrer el lote en diagonal y extraer 20 a 40 folíolos centrales de la mitad inferior de las plantas al menos 1 a 2 veces por semana desde la floración en adelante. Para ello detenerse de vez en cuando y extraer los folíolos hasta completar de 20 a 40. Comenzar por los lotes sembrados más temprano. Si dentro del lote existen zonas amarillentas, marrones o de mayor concentración de humedad comenzar por ese sector. Si se tiene una gran superficie o varios lotes para monitorear, pueden agruparse en un gran “lote semejante” siempre que sean de la misma variedad, conducidos con similares prácticas de manejo e implantados en lotes de similares tipos de suelo y la misma o similar fecha de siembra (en un rango de hasta 10 días).

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Videos

Rust: the fungi that attacks plants. Created by Chris Hammang, Producer Sean O’Donoghue, Scientific Consultant Peter Dodds. C SIRO (Video)

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