title: Rapid-growth responses of corn root segments: Effect of citrate-phosphate buffer on elongation.
abstract: The effects of citrate-phosphate buffer on the elongation rate of 2 mm root segments of Zea mays L. was investigated under O2 and N2 conditions by comparing with the effects in non-buffered solution. The buffer at pH 7.0 has an inhibiting effect on the elongation rate of root segments. At pH 4.0 the buffer has a promoting effect on the elongation rate twice that of the H-ion concentration. Nitrogen experiments indicate that growth in neutral buffer is O2 dependent. On the other hand the acid-growth response of root segments in citrate-phosphate buffer appears to have two components, 1) a H-ion component which is partially inhibited by N2 and fluoride and 2) a citrate component which is inhibited in part by N2 but not by fluoride.
authors.affiliation: Department of Botany, University of North Carolina, 27514, Chapel Hill, North Carolina, USA.
authors.forename: K L
authors.initials: KL
authors.lastname: Edwards
authors.forename: T K
authors.initials: TK
authors.lastname: Scott