title: Photovoltaic measurement of early gravicurvature.
abstract: An easily constructed photovoltaic method of growth measurement capable of detecting movement occurring a a speed of 1.7 hum min-1 and avoiding physical interference with plant material is described. The application of this method to the measurement of early gravicurvature of nodal segments of Lolium multiforum and peduncle lengths of Taraxacum officinale is outlined and some measurements of lag times together with speeds of early gravicurvature obtained for these gravitropic systems are presented. Other applications of this photovoltaic method are suggested.
authors.affiliation: Botany Department, The Queen's University of Belfast, Belfast, Northern Ireland.
authors.forename: S J
authors.initials: SJ
authors.lastname: Lynd
authors.forename: P E
authors.initials: PE
authors.lastname: Clifford