title: Structure-activity relationship of acetylenes from galls of Hedera rhombea as plant growth inhibitors.
abstract: The structure-activity relationship of 12 isolated acetylenes from galls of Hedera rhombea (Araliaceae) induced by Asphondylia sp. (Cecidomyiidae) and their derivatives has been studied for the inhibition of the shoot and root growth of rice, perennial ryegrass, cockscomb, lettuce, and cress. Almost all acetylenes generally showed growth inhibitory activity. The diacetylenes exhibited higher activity than the monoacetylenes, suggesting that a conjugated diyne segment is essential for the activity. On the other hand, the acetylenes with a nonoxidated methylene group at C-8 showed stronger activity comparing with those possessing hydroxy and acetoxy groups at C-8. Furthermore, it has been demonstrated that the acetylenes bearing a terminal olefinic group at C-16, C-17 enhanced the activity. It is thus clarified that important sites for the activity of the acetylenes from galls of H. rhombea are a conjugated diyne and a terminal olefinic group connecting to the aliphatic chain and that less oxidated compounds show more activity.
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan.
authors.forename: Sayumi
authors.initials: S
authors.lastname: Yamazoe
authors.forename: Koji
authors.initials: K
authors.lastname: Hasegawa
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Shigemori
mesh_terms: D000114:Acetylene / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D035981:Hedera / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009904:Optical Rotation; D010937:Plant Growth Regulators / Q000494:pharmacology*; D018517:Plant Roots; D018520:Plant Shoots; D013329:Structure-Activity Relationship
chemical_list: D010937:Plant Growth Regulators; D000114:Acetylene