Abstract
The susceptibility of leaves and berries of five night-shade species to infection by the potato late blight pathogenPhytophthora infestans was tested. American black nightshade (Solanum americanum) and eastern black nightshade (Solanum ptycanthum) were resistant to infection. However, two accessions (entire-edged and dentate-edged leaf) of hairy nightshade (Solanum sarrachoides), cutleaf nightshade (Solanum triflorum), and bitter or climbing nightshade (Solanum dulcamara) were susceptible. Survival of the pathogen in susceptible species was tested under different environmental conditions. The pathogen survived for at least 2 wk in both hairy nightshade accessions when plant material was kept in soil at a temperature of 20 C. However,P. infestans survived 48 h at −15 C only in the entire-leaf hairy nightshade accession. In the laboratory, oospores of the pathogen were formed in inoculated plants of the two hairy nightshade accessions, cutleaf nightshade, and ‘Russet Burbank’ potato, but not in American black nightshade, bitter nightshade, or eastern black nightshade.
Resumen
Se probó la susceptibilidad a la infección del patógeno del tizón tardíoPhytophthora infestans en hojas y bayas de cinco especies de dulcamara (hierba mora). Fueron resistentes a la infección la dulcamara negra americana (Solanum americanum) y la dulcamara negra del este (Solanum ptycanthum). Sin embargo, dos accesiones (de hoja lisa y hoja dentada) de la dulcamara pilosa (Solanum sarrachoides), dulcamara de hoja partida (Solanum triflorum) y dulcamara amarga o trepadora (Solanum dulcamara) fueron susceptibles. La supervivencia del patógeno en las especies susceptibles se probó bajo diferentes condiciones de medio ambiente. El patógeno sobrevivió por lo menos por dos semanas en ambas accesiones pilosas cuando la planta se mantuvo en el suelo a una temperatura de 20 C. Sin embargo,P. infestans sobrevivió 48 horas a −15 C solamente en la accesión de dulcamara de hoja pilosa entera. En el laboratorio, las oosporas del patógeno se formaron en las plantas inoculadas de dos accesiones pilosas, dulcamara de hoja partida y la variedad Russet Burbank pero no en la dulcamara negra americana, la dulcamara amarga o en la dulcamara negra del este.
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Dandurand, L.M., Knudsen, G.R. & Eberlein, C.V. Susceptibility of five nightshade (Solanum) species tophytophthora infestans . Am. J. Pot Res 83, 205–210 (2006). https://doi.org/10.1007/BF02872156
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DOI: https://doi.org/10.1007/BF02872156