title: Growth inhibitor production by root caps in relation to geotropic responses.
authors.affiliation: Department of Physiology and Environmental Studies, University of Nottingham, School of Agricultural Sciences, Sutton Bonington, Loughborough, Leicestershire.
authors.forename: G S
authors.initials: GS
authors.lastname: Gibbons
authors.forename: M B
authors.initials: MB
authors.lastname: Wilkins