Table 1.

Collection of rice straw and isolation of natto-fermenting strains

Harvest siteNo. of rice straw samples collectedNo. of strains isolated
Natto fermentingNonfermenting
Ibaraki Prefecture
    Hitachioomiya area8028
    Mito area261425
    Tsukuba area5033
    Tutiura area5014
    Namegata area92110
    Inashiki area640
    Bandou area19788
    Tikusei area15286
Other prefectures
    Hokkaidou-Sapporo area2022
    Miyagi-Sendai area2120
    Niigata-Jouestu area101
    Hiroshima-Fukuyama area2105
    Fukuoka-Chikugo area2012
    Okinawa-Ishigaki area2021
Total10459365