Bacterial diversity on the surface of potato tubers in soil and influence of the plant genotype

N. Weinert, R. Meincke, C. Gottwalf, H. Heuer, M. Schloter, Gabriele Berg, K. Smalla

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The surface of tubers might be a reservoir for bacteria that are disseminated with seed potatoes or that affect postharvest damage. The numbers of culturable bacteria and their antagonistic potential, as well as bacterial community fingerprints were analysed from tubers of seven field-grown potato genotypes, including two lines with tuber-accumulated zeaxanthin. The plant genotype significantly affected the number of culturable bacteria only at one field site. Zeaxanthin had no effect on the bacterial plate counts. In dual culture, 72 of 700 bacterial isolates inhibited at least one of the potato pathogens Rhizoctonia solani, Verticillium dahliae or Phytophthora infestans, 12 of them suppressing all three. Most of these antagonists were identified as Bacillus or Streptomyces. From tubers of two plant genotypes, including one zeaxanthin line, higher numbers of antagonists were isolated. Most antagonists showed glucanase …
Original languageEnglish
Pages (from-to)114-123
JournalFEMS Microbiology Ecology
Issue number74
Publication statusPublished - 2010

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