Abstract
Siderophore-producing activity of heterotrophic bacteria isolated from sediments of a small lagoon by Lake Biwa was examined by bioassay with siderophore auxotrophs. About a half of the heterotrophic bacteria exhibited siderophore producing activity and there were not so much differences in the presence of siderophore-producing bacteria between in the surface layer of the sediment and in the subsurface layer, even though the concentration of ferrous iron in these sedi-ments was different. Though the concentration of ferrous iron in the interstitial water seemed sufficient to repress the siderophore production by these bacteria, siderophore was detected in the interstitial water of the sediment when assayed by hyroxamate suxotroph Arthrobacter flavescens JG-9 after extracted the siderophore from interstitial water.
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