Virulence of Phytophthora infestans isolates from potato in Spain

Alba Alvarez-Morezuelas, Nestor Alor, Leire Barandalla, Enrique Ritter and Jose Ignacio Ruiz de Galarreta
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Alba Alvarez-Morezuelas: NEIKER-Basque Institute for Agricultural Research and Development-BRTA, Vitoria, Spain
Nestor Alor: NEIKER-Basque Institute for Agricultural Research and Development-BRTA, Vitoria, Spain
Leire Barandalla: NEIKER-Basque Institute for Agricultural Research and Development-BRTA, Vitoria, Spain
Enrique Ritter: NEIKER-Basque Institute for Agricultural Research and Development-BRTA, Vitoria, Spain

Plant Protection Science, 2021, vol. 57, issue 4, 279-288

Abstract: The oomycete Phytophthora infestans is responsible for the disease known as late blight in potato and tomato. It is the plant pathogen that has caused the greatest impact on humankind so far and, despite all the studies that have been made, it remains the most important in this crop. In Spain during the last years a greater severity of the disease has been observed in both, potato and tomato, probably due to genetic changes in pathogen populations described recently. The aim of this study was the characterization of the physiological strains of 52 isolates of P. infestans obtained in different potato-growing areas in Spain. For this purpose, inoculations on detached leaves were performed in order to determine compatibility or incompatibility reactions. A total of 17 physiological races were found. The less frequent virulence factors were Avr5 and Avr8. By studying the epidemiology of the pathogen, a specific breeding program for late blight resistance can be implemented.

Keywords: physiological strains; late blight; Solanum tuberosum; virulence (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpps:v:57:y:2021:i:4:id:39-2021-pps

DOI: 10.17221/39/2021-PPS

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