Abstract
Glycoalkaloids are anti-nutritional compounds commonly found in wildSolanum species used as resistance sources to major potato pathogens. It is therefore important for breeding purposes to know whether selecting for resistance using such species necessarily selects also for high glycoalkaloid contents in the tubers. To test this hypothesis, we used six partial progenies from crosses betweenSolanum tuberosum and accessions ofS. andigena, S. berthaultii, S. phureja, andS. vernei to investigate the possible correlation between resistance toPhytophthora infestans and/or toErwinia carotovora subsp.atroseptica and the concentration of glycoalkaloids in tubers. Concentrations of α-solanine and α-chaconine in the tubers segregated in each progeny, as did resistance to each pathogen. Some, but not all, clones from each progeny showed hypersensitive reactions to the isolate ofP. infestans used. Furthermore, clones within each progeny also differed for components of partial resistance toP. infestans, suggesting that all four wild species could be used as sources of both race-specific and partial resistance to late blight. With the exception of low, but statistically significant, correlations between concentration of α-solanine and two late blight resistance components (incubation period and spore production per unit lesion area) in progenies derived fromS. vernei, and despite a trend towards higher glycoalkaloid concentrations in the tubers of the clones most resistant to soft rot within progenies derived fromS. berthaultii andS. vernei, no consistent relationship between resistance to either disease and concentrations of α-solanine and/or α-chaconine was observed. These results indicate that neither race-specific nor partial resistance to late blight and soft rot in the accessions used as progenitors of resistance depend on high solanine or chaconine concentrations. These resistance sources could thus prove useful in breeding programs for improved behaviour againstP. infestans and/orE. carotovora.
Resumen
Los glicoalcaloides son compuestos antinutricionales que se encuentran presentes en las especies silvestres deSolanum usadas como fuentes de resistencia a los principales patógenos. Es por lo tanto importante con fines de mejoramiento, conocer si la selección hecha para obtener resistencia utilizando tales especies selecciona también necesariamente para contenidos altos de glicoalcaloides en los tubérculos. Para probar esta hipótesis, hemos utilizado seis progenies parciales provenientes de cruzamientos entreSolanum tuberosum y accesiones deS. andigena, S. berthaultii, S. phureja yS. vernei, con el objeto de investigar la existencia de una posible correlación entre la resistencia aPhytophthora infestans y/o aErwinia carotovora subsp.atroseptica y la concentración de glicoalcaloides en los tubérculos. Las concentraciones de α-solanina y α-chaconina en los tubérculos segregaron en cada progenie, asi como la resistencia a cada uno de los patógenos mencionados. Algunos, aunque no todos los clones en cada progenie mostraron reacciones de hipersensibilidad al aislamiento utilizado deP. infestans. Más aun, los clones dentro de cada progenie también mostraron diferencias en los componentes de la resistencia parcial aP. infestans, lo que sugiere que las cuatro especies de papa silvestre antes mencionadas pueden ser utilizadas como fuentes tanto para resistencia específica como para resistencia parcial aP. infestans. Con excepción de una reducida pero estadísticamente significativa correlación entre concentración de α-sblanina y dos componentes de resistencia al tizón tardío (periodo de incubación y producción de esporas por unidad de área de lesión) en progenies derivadas deS. vernei, y a pesar de una tendencia hacia altas concentraciones de glicoalcaloides en los tubérculos de los clones más resistentes a la pudrición blanda dentro de las progenies derivadas deS. berthaultii yS. vernei, no se ha observado una relación consistente en la resistencia a ambas enfermedades y la concentracios de α-solanina y/o α-chaconina. Estos resultados indican que ni la resistencia especifica, ni la resistencia parcial al tizón tardío y a la pudrición blanda en las accesiones utilizadas como progenitores de resistencia depende de la presencia de altas concentraciónes de solanina o de chaconina. Estas fuentes de resistencia pueden así ser de utilidad en los programas de mejoramiento para una mejor respuesta contraP. infestans y/oE. carotovora.
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Andrivon, D., Corbière, R., Lucas, JM. et al. Resistance to late blight and soft rot in six potato progenies and glycoalkaloid contents in the tubers. Am. J. Pot Res 80, 125–134 (2003). https://doi.org/10.1007/BF02870211
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DOI: https://doi.org/10.1007/BF02870211