This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Web of Science (16) Citing Articles via Google Scholar Google Scholar Articles by Rehm, M. M. Articles by Cline, M. G. Search for Related Content PubMed PubMed Citation Articles by Rehm, M. M. Articles by Cline, M. G. Agricola Articles by Rehm, M. M. Articles by Cline, M. G.

Articles

Inhibition of Low pH-induced Elongation in Avena Coleoptiles by Abscisic Acid ¹

^a Department of Botany, The Ohio State University, Columbus, Ohio 43210

An angular position-sensing transducer was used to make continuous measurements of acid-induced elongation of Avena sativa coleoptile segments. Elongation rates at pH 4.5 (5 mM succinate buffer) were about 5-fold greater than those at pH 6.0. Buffered 0.1 mM abscisic acid produced a partial decrease of the growth rate. Pretreatments with abscisic acid buffered at pH 6.0 usually caused a further reduction of the elongation response when the coleoptile segments were subsequently placed in buffer at pH 4.5 containing abscisic acid. Abscisic acid did not completely prevent the pH effect in any of these experiments, and the brief latent period of the pH response was not affected by abscisic acid treatments. At pH 4.5, where the inhibitory effect of ABA was maximum, low pH-induced elongation was also inhibited by KCN and HgCl₂. These results suggest that pH-(4.5) induced elongation in this system may be dependent on some metabolic processes and that abscisic acid-induced inhibition of this elongation may involve an interaction with these processes.

¹ Paper No. 831 from the Department of Botany, Ohio State University.