Growth inhibitory activity of ABA-β-d-glucopyranosyl ester and ABA-β-d-glucosidase

Short Communication
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Abstract

Exogenously applied ABA-β-d-glucopyranosyl ester (ABA-GE) inhibited shoot growth of alfalfa (Medicago sativa L.), cress (Lepidium sativum L.), lettuce (Lactuca sativa L.), Digitaria sanguinalis L., timothy (Pheleum pratense L.) and ryegrass (Lolium multiflorum Lam.) seedlings at concentrations greater than 0.1 μM. The growth inhibitory activity of ABA-GE on these shoots was 26–40% of that of (+)-ABA. ABA-β-d-glucosidase activities in these seedlings were 11–31 nmol mg−1 protein min−1. These results suggests that exogenously applied ABA-GE may be absorbed by plant roots and hydrolyzed by ABA-β-d-glucosidase, and liberated free ABA may induce the growth inhibition in these plants. Thus, although ABA-GE had been thought to be physiologically inactive ABA conjugate, ABA-GE may have important physiological functions rather than an inactive conjugated ABA form.

Keywords

Abscisic acid-β-d-glucopyranosyl ester Abscisic acid-β-d-glucosidase Seedling growth inhibition 

Abbreviations

ABA

Abscisic acid

ABA-GE

Abscisic acid-β-d-glucopyranosyl ester

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2008

Authors and Affiliations

  1. 1.Department of Applied Biological Science, Faculty of AgricultureKagawa UniversityKagawaJapan

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