Effects of abscisic acid analogues on abscisic acid-induced gene expression in barley aleurone protoplasts: relationship between structure and function of the abscisic acid molecule
1993
Meulen, R.M. van der | Heidekamp, F. | Jastorff, B. | Horgan, R. | Wang, M.
A 520 The plant hormone abscisic acid (ABA) mediates gene expression in barley aleurone protoplasts. In order to elucidate the essential functional groups of the ABA molecule, the specificity of a number of ABA analogues for inducing ABA-regulated gene (e.g., RAB, BASI) expression in barley aleurone protoplasts was studied. These analogues have modifications at three different positions of the ABA molecule: (a) the 1'-hydroxyl group (1'-deoxy ABA), (b) the carboxyl group (ABA-methyl ester or ABA-glucose ester), and (c) both the 1'-hydroxyl and 4'-carbonyl groups (alpha-ionylidene acetic acid). The importance of the different putative functional groups was analyzed. The dose-response analysis of ABA analogues upon the induction gene expression showed the following order: ABA > ABA methyl ester > 1'-deoxy ABA > ABA glucose ester > alpha-ionylidene acetic acid > alpha-beta-ionone.
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