Growth-Regulating Activity of Three 4-Hydroxycoumarin Derivatives on Inoculated Soybean Plants |
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| Authors: | Stancho Stanchev Teodor Boyanov Maria Geneva Madlen Boychinova Ira Stancheva Ilia Manolov |
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| Institution: | (1) Department of Organic Chemistry, Faculty of Pharmacy, 2 Dunav Street, Sofia, 1000, Bulgaria;(2) Academy of the M. Popov Institute of Plant Physiology, Acad. G. Bonchev Street, Bl. 21, Sofia, 1113, Bulgaria |
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| Abstract: | Three 4-hydroxycoumarin derivatives (ethyl 2-(4-hydroxy-2-oxo-2H-chromen-3-yl)(4-hydroxyphenyl)methyl]-3-oxobutanoate (SS-14), ethyl 2-(4-hydroxy-2-oxo-2H-chromen-3-yl)(3-nitrophenyl)methyl]-3-oxobutanoate (SS-21), and 2-(3,4,5-trimethoxyphenyl)(4-hydroxy-2-oxo-2H-chromen-3-yl)methyl]-3-oxobutanoate (T-2)] were tested for growth-regulating activity on nitrogen-fixing soybean plants in
different concentrations: 10−5, 10−4, and 10−3 M. They revealed growth-regulating activity in a concentration-dependent manner. The most powerful suppression effect of
T-2 on shoot and root fresh and dry biomass accumulation, length of roots, and height of plants was found. Shoot fresh biomass
was suppressed in an equal extent at 10−3 M of the three compounds but the order of inhibition regarding the three applied concentrations was T2 > SS-14 ≈ SS-21. The
compound SS-14 inhibited nodule number and nodule biomass mainly at the highest applied concentration, 10−3 M. The highest inhibition of nitrogenase activity was established at the three applied concentrations of the compound SS-14. |
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