, Volume 86, Issue 4, pp 297-303
Date: 25 Mar 2009

Hairy Nightshade is an Alternative Host of Spongospora subterranea, the Potato Powdery Scab Pathogen

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Abstract

Root galls possibly caused by Spongospora subterranea were observed on hairy nightshade (Solanum sarrachoide; HNS). HNS galls and galls from potato were used to artificially inoculate potato and HNS. Eighty-three and 52% potato and HNS plants inoculated with potato inoculum had root galls, respectively. Ten and 31% potato and HNS plants inoculated with HNS inoculum had root galls, respectively. A S. subterranea-specific PCR significantly correlated (P < 0.0001, Phi Coefficient = 0.69) with visual assessment of gall incidence in 34 of 40 samples. Five of 40 samples had no galls, but gave positive PCRs. One of 40 samples had root galls, but gave a negative PCR. More sporosori were produced on potato than on HNS. Therefore, the root galls on HNS were caused by S. subterranea that is able to complete its life cycle on HNS and produce new generations of sporosori that are infectious on potato.

Resumen

Agallas de la raíz, posiblemente causadas por Spongospora subterranea fueron observadas en belladona vellosa (Solanum sarrachoide; HNS). Agallas de HNS y de papa fueron utilizadas para inocular artificialmente papa y HNS. El 83% y el 52% de plantas de papa y HNS inoculadas con inóculo de papa tuvieron agallas de la raíz respectivamente. El 10% y 31% de plantas de papa y HNS inoculadas con inóculo de HNS tuvieron agallas de la raíz respectivamente. Un PCR especifico para S. subterranea correlacionó significativamente (P < 0.0001, Coeficiente Phi = 0.69) con evaluación visual de incidencia de agallas en 34 de 40 muestras. Cinco de 40 muestras no tuvieron agallas pero dieron PCR positivo. Una de las 40 muestras tuvo agallas de la raíz pero dio PCR negativo. Más sporosori fue producido en papa que en HNS. Por lo tanto las agallas de la raíz en HNS fueron causadas por S. subterranea que es capaz de completar su ciclo de vida en HNS y producir nuevas generaciones de sporosori que son infecciosas en papa.