Endogenous levels of abscisic acid in various organs of <em>Vitis vinifera</em> L. (cv. Cabernet Sauvignon) between flower buds separated and grape closed stages

Abstract

&lt;p&gt;Free abscisic acid (ABA) and bound abscisic acid (ABA-GE: ABA glucose ester) contents and growth were investigated in leaves, internodes, flowers buds, flowers and berries of &lt;em&gt;Vitis vinifera&lt;/em&gt; L. cv. Cabernet Sauvignon between flower buds separated and grape closed stages. The ABA levels in leaves and in internodes decrease when the growth was hight and increases when the growth become smaller or stopped. What is more, ABA was accumulated hightly in the flowers (at 50% of flowering) and then appears to be a good marker of flowering. ABA contents decreased at berry setting and till grape closed stage. In leaves, internodes, flowers buds and flowers, ABAGE and ABA show an inverse development and then suggests an interconversion phenomenon between theses two forms. Two most importants points were discuted in this paper: 1) The role of ABA in the controle of growth and development of the organs studied and (2) The translocation of abscisic acid between the organs studied and the role of ABA-GE in this transport.&lt;/p&gt;

Cathodic adsorptive stripping voltammetry of abscisic acid using pencil-lead bismuth-film electrode

“…Metabolism can occur by several routes involving oxidation, reduction, and conjugation (Cutler and Krochko 1999 ). The study of the variation of ABA concentration in different plant tissues can therefore provide knowledge on the ABA biosynthesis and degradation pathways, and the correlation with different physiological and environmental parameters (Xiong and Zhu 2003, Koussa et al 2004, Soar et al 2004 ). Using biotechnology approaches to control ABA levels is seen as a powerful strategy for improving plant performance and productivity, and there is currently much research into the molecular mechanism of ABA action (Rock 2000 ).…”