Abstract
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.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Evans M. L., Ray P. M., Reinhold L. Induction of coleoptile elongation by carbon dioxide. Plant Physiol. 1971 Mar;47(3):335–341. doi: 10.1104/pp.47.3.335. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Rayle D. L., Cleland R. Enhancement of wall loosening and elongation by Acid solutions. Plant Physiol. 1970 Aug;46(2):250–253. doi: 10.1104/pp.46.2.250. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Rehm M. M., Cline M. G. Rapid growth inhibition of Avena coleoptile segments by abscisic Acid. Plant Physiol. 1973 Jan;51(1):93–96. doi: 10.1104/pp.51.1.93. [DOI] [PMC free article] [PubMed] [Google Scholar]