L'abscissate de β-D-glucopyranose peut-il être une source d'acide abscissique libre <i>in vivo</i>?

Authors

  • M. Broquedis

DOI:

https://doi.org/10.5073/vitis.1989.28.121-135

Keywords:

abscisic acid, abscisyl-ß-D-glucopyranoside, seed, embryo, dormancy, stratification, germination, hydration

Abstract

Can abscisyl-β-D-glucopyranoside be a source of free abscisic acid in vivo?

In grape seeds, the evolution of abscisic acid (ABA) and of its glucose ester abscisyl-ß-D-glucopyranoside (ABA-GE) during treatments for breaking dormancy was investigated. It could be shown that complete disappearance of ABA-GE content from the seeds must essentially be due to the conversion of ABA-GE into free ABA. This phenomenon seems only to take place under the influence of stratification treatments andin the presence of vital embryos. The amounts of free ABA accumulated decrease mainly by diffusion and degradation, thus becoming minimal. The rate of germination appears closely linked with the amount of free ABA in the seeds. When germination takes place, there is no langer any free ABA present in the seeds. Afterwards, from the first developmental stages of the plantlet, free ABA and ABA-GE reappear, particularly in the cotyledons, where both forms are probably synthesized from a precursor located in these organs.

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Published

2015-12-15

Issue

Vol. 28 No. 3 (1989): VITIS

Section

Article

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