The influence of pinosylvin and its methyl ester on the growth of plants

In this article are given the biotesting data of pinosylvin (PS) and its methyl ester (PSME) isolated from dormant buds of Alnus fruticosa (Rupr.). Coleoptile segments of wheat and aquatic plant Spirodela polyrhiza (L.) Schleid. were used as the test objects. Low concentrations of PS and PSME have weakly stimulated the growth of wheat during 22 hours of incubation. If concentrations of PS and PSME are increased up to 10–15 mg/L during the first 3 hours of incubation, the growth of coleoptiles slowed by 20–35 %, but during 22 h the growth reduced by 21–48 %. The PSME has stronger growth-inhibitory effect than PS. Further increasing of PS concentration (up to 25 mg/l) inhibited the growth of coleoptiles by 61 % during 22 hours. At the same concentration the PSME inhibited the growth by 67 % during the first 3 hours and completely suppressed the growth with loss of turgor during 22 hours. In the case of S. polyrhiza adding PS with 1 mg/l concentration to the nutrient medium resulted in decrease of its growth and development after 10 days of experiment by 40 %, but with higher concentration (25–50 mg/l) the growth process was completely inhibited. S. polyrhiza grown in a nutrient medium with 0.01, 0.1 and 1 mg/l concentrations of PSME shows a weak stimulation of growth and development. At the same time the PSME concentrations higher than 10 mg/l leaded to yellowing of plants during the first 2 days. These results show that pinosylvin and its methyl ester inhibit the growth of wheat coleoptiles segments in 50–100 times stronger than the known phenolic inhibitors (carboxylic acids, polyphenols and their glycosides).

Abstract licence: CC BY

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