title: 1-Naphthyl Acetate-Dependent Medium Acidification by Zea mays L. Coleoptile Segments.
abstract: Zea mays L. cv INRA 5a coleoptile segments ecidify the incubation medium on the addition of 1-naphthyl acetate (1-NA). The buffering capacity of the bathing solution increases during 1-NA stimulated medium acidification. The solution bathing the 1-NA treated coleoptile segment was analyzed by high performance liquid chromatography. A considerable amount of acetic acid was detected in the bathing solution used to measure 1-NA-dependent medium acidification. For the first time, the data demonstrate directly the release of acetic acid from 1-NA. The extent of medium acidification was proportional to 1-NA concentration. Simultaneous measurement of medium acidification and acetate content upon addition of 1-NA showed that both processes were temporally correlated. The stoichiometry of proton equivalents to acetate ion was 0.966. Addition of 50 micromolar N,N'-dicyclohexylcarbodiimide had little effect on 1-NA-dependent medium acidification. The results indicate that 1-NA is hydrolyzed in the extracellular space of coleoptile cells.
authors: Department de Biologia Vegetal, Universitat de Valencia, E-46100 Burjassot, Valencia, Spain.
authors: J
authors: J
authors: Salguero
authors: A
authors: A
authors: Calatayud
authors: F
authors: F
authors: Gonzalez-Daros
authors: S
authors: S
authors: Del Valle-Tascon