Internal colonization pathways of potato plants by Erwinia carotovora ssp. atroseptica

摘要: Transmission of pectinolytic Erwinia species from infected mother tubers to daughter has been studied mainly through detection tests, carried out at harvest, on limited samples produced by plants grown artificially inoculated tubers. However, not performed collected different stages crop development, in order follow the contamination progress organs progeny In this study bacterial was investigated detecting carotovora ssp. atroseptica symptomless plant (stolons, stems, tubers) and parts with or without symptoms diseased various development. Infection levels below- above-ground two cultivars differing their resistance Erwinia, either vacuum infiltration sand wounding, were monitored throughout growing season harvest using DAS-ELISA PCR. Detection tests showed that healthy less frequently contaminated than plants, stolons precociously more stems tubers, irrespective health plant. Stem infections shown latently stem, bacteria usually being recovered 10–15 cm past visible lesions. many cases, typical aerial stem-rot could be related upward movement tuber. Daughter contaminated, heel ends, suggesting internal tuber progeny.