Abstract
Several tuber-bearingSolanum species were screened for resistance to races 1 and 2 of Columbia root-knot nematode,Meloidogyne chitwoodi. Reproductive factor (Rf = Pf/Pi) was assessed and used to infer host resistance. Several clonal selections in one Plant Introduction accession ofSolanum hougasii showed high levels of resistance to both races. Crosses ofS. hougasii with tetraploid breeding clones yielded 14 vigorous F1 hybrids. Three of these interspecific hybrids expressed non-host (Rf<0.1) responses to race 1 and poor host (0.1<Rf<1.0) responses to race 2. Six hybrids were nonhosts to race 1 but good hosts (Rf>1.0) to race 2. Three hybrids were good hosts to both races, and one was a poor host to race 1 and non-host to race 2. The occurrence of resistance to both races in the F1 hybrids indicates success in the first step of introducing resistance to races 1 and 2 ofM. chitwoodi to the cultivated potato gene pool.
Compendio
Se evaluaron y seleccionaron varias especies deSolanum tuberizantes para resistencia a las razas 1 y 2 del nematodo del nódulo de la raíz de Columbia,Meloidogyne chitwoodi. Se determinó el factor de reproducción (Rf = Pf/Pi) para inferir la resistencia del hospedante. Varias selecciones clonales en una entrada de la Introductión de Plantas desolanum bougassi mostraron altos niveles de resistencia a ambas razas. Cruzamientos con clones tetraploides de mejoramiento rindieron 14 vigorosos híbridos F1. Tres de estos híbridos interespecíficos no expresaron respuesta del hospedante (Rf<0,1) a la raza 1 y respondieron pobremente (0,1<Rf<1,0) a la raza 2. Seis híbridos no fueron hospedantes de la raza 1, pero si fueron buenos hospedantes de la raza 2 (Rf>1,0). Tres híbridos fueron buenos hospedantes para ambas razas y uno fue un pobre hospedante para la raza 1 y no fue hospedante de la raza 2. La presencia de resistencia a ambas razas en los híbridos F1 indica el éxito del primer paso de la introducción de la resistencia a las razas 1 y 2 deM. chitwoodi al pul de genes de la papa cultivada.
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Cooperative investigations of the ARS, USDA, and the Washington State University Agriculture Research Center, Prosser, WA 99350. College of Agriculture and Home Economics Research Center, Pullman, WA 99164. Horticulture & Landscape Architecture Scientific Paper No. 90-25.
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Brown, C.R., Mojtahedi, H. & Santo, G.S. Resistance to Columbia root-knot nematode inSolanum ssp. and in hybrids ofS. hougasii with tetraploid cultivated potato. American Potato Journal 68, 445–452 (1991). https://doi.org/10.1007/BF02853782
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DOI: https://doi.org/10.1007/BF02853782