The effect of decumbenones A (1), B (2) and C (3) from the marine-derived strain of the fungus Aspergillus sulphureus on the growth of seedling roots of buckwheat, wheat, barley and corn at the concentration range 10 −5-10 −18 M was studied. It was shown that decumbenone B had a stimulatory effect on the growth of seedling roots of buckwheat, decumbenone A-on the growth of seedling roots of spring soft wheat, decumbenone Con the growth of seedling roots of spring barley, decumbenone A, B and Con the growth of seedling roots of corn. The stimulatory effect for some substances was shown at ultra-low concentrations 10 −12-10 −18 M. It is possible to recommend decumbenones A, B and C for studying in field conditions as growth factors of buckwheat, wheat, barley and corn.

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