Characteristics of microflora in the root zone of potato plants as affected by field management

Tabuchi Hiroyasu, Naitoh Tomoko, Kosugi Akiko, Nioh Ichio

doi:10.18946/jssm.54.1_41

We compared the bacterial and fungal flora in the root zone of potato plants cultivated under Nature-Farming systems (NF) which are similar to organic farming systems, with those under conventional farming systems (CF). The fields under NF and CF were adjacent to each other in Mishima city, Shizuoka, Japan, and managed by different farmers. There was no appreciable difference between both systems in the number of aerobic bacteria and actinomyces in the potato roots and soils. The number of fluorescent Pseudomonas in the samples from NF was higher than that of CF. MIS (Microbial Identification System, MIDI Inc.) was used to identify the aerobic bacteria isolated from the roots. MIS indicated that the same bacterial species were isolated from both samples as the most abundant species. Based upon MIS analysis, the diversity of the root-colonizing bacteria of potato under NF was higher than that under CF. The bacteria showing an antifungal activity against a phytopathogen, Rhizoctonia solani, were isolated from the NF potato roots rather than from the CF roots. Comparison of the root fungal flora by the root-washing technique showed that Fusarium sp. and Trichoderma sp. were isolated from NF roots and CF roots, respectively, as the main fungi. The diversity of the root fungi under NF was higher than that under CF.

Characteristics of microflora in the root zone of potato plants as affected by field management

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