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Studies on cytokinin-like substances synthesized by planktonic bacteria isolated from littoral and pelagial zones of the lake Jeziorak in spring and summer have been carried out. 62.5% of bacteria isolated in summer, and 12.5% of bacteria isolated in spring were able to produce cytokinin-like substances. Among synthesized substances there occurred isopentenyladenine (2iP, i6Ade), zeatin (Z, io6Ade)...
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