Isolation and structural identification of a germination inhibitor in fire-recruiters from the California chaparral.
A role for inhibitors as regulators of seed dormancy in fire-dependent annuals and their nondormant (fire-independent) congeners was examined in the family Hydrophyllaceae. From seeds of the fire-dependent species, Emmenanthe penduliflora, Phacelia minor, P. brachyloba, and P. grandiflora, extracts were obtained that were found to be largely self-inhibitory and potent inhibitors of seed germination in nondormant congeners. Lower activity was detected in the fire-independent species, P. tanacetifolia and P. campanularia. The inhibitory activity was associated with the new sucrose ester, 6-O-linoleyl-alpha-D-glucopyranosyl-beta-D-fructofuranoside.
Egerton-Warburton
L M
LM
Center for Conservation Biology and Department of Botany and Plant Sciences, The University of California, Riverside, California 92521, USA.
Ghisalberti
E L
EL
D001681:Biological Assay; D002140:California; D018525:Germination / Q000187:drug effects; D029522:Hydrophyllaceae / Q000737:chemistry*; D019787:Linoleic Acid / Q000737:chemistry* / Q000302:isolation & purification* / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010937:Plant Growth Regulators / Q000737:chemistry* / Q000302:isolation & purification* / Q000494:pharmacology; D012639:Seeds / Q000737:chemistry / Q000187:drug effects / Q000254:growth & development; D013045:Species Specificity; D013395:Sucrose / Q000031:analogs & derivatives*
D010937:Plant Growth Regulators; D013395:Sucrose; D019787:Linoleic Acid