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■ Isolation and Structure Elucidation of a Potent Growth Inhibitor, Helian, from Blue Light-Illuminated Sunflower (Helianthus annuus) Hypocotyls

Tsuyoshi Hasegawa, Shigenori Togo, Yosuke Hisamatsu, Kosumi Yamada,* Kiyotake Suenaga, Mitsuhiro Sekiguchi, Hideyuki Shigemori, and Koji Hasegawa

*Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan

Abstract

A potent growth inhibitor was isolated from blue light-illuminated sunflower (Helianthus annuus) hypocotyls and identified as 8-(β-D-glucopyranosyloxy)-3-hydroxy-1,9,14-pentadecatriene-4,6-diyne (1, designated “helian”) from analysis of its ¹H and ¹³C NMR spectra, and HRFABMS. Helian 1 showed plant growth-inhibitory activity at concentrations higher than 2.6 x 10^-6 mol/L for the cress root growth test. The amount of helian was higher in the illuminated halves than in the shaded ones in phototropically stimulated sunflower hypocotyls. These results suggest that this new potent growth inhibitor, helian, may play an important role on phototropism of sunflower hypocotyls.