Correlation between Plant Growth Regulator Release Rate and Bioactivity for the Series of Newly Synthesized Phytoactive Polymers

Phytoactive polymers are high molecular weight systems in which a plant growth regulator (PGR) unit is attached to the polymeric chain by a hydrolyzable chemical bond. The release rate of the PGR is linked to the biological activity of the phytoactive polymer and can be controlled by properties inhe...

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Bibliographic Details
Published in:Journal of plant growth regulation 2006-09, Vol.25 (3), p.211-218
Main Authors: Shtilman, Michael I, Tzatzarakis, Manolis N, Voskanyan, Potvakan S, Tsakiris, Ioannis N, Tsakalof, Andreas K, Tsatsakis, Aristidis M
Format: Article
Language:English
Subjects:
2,4-D
barley
bioactive properties
coleoptiles
Esters
Growth regulators
Hordeum vulgare
Hydrolysis
Molecular weight
Plant growth
plant growth substances
Polymers
Triticum aestivum
wheat
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Summary:Phytoactive polymers are high molecular weight systems in which a plant growth regulator (PGR) unit is attached to the polymeric chain by a hydrolyzable chemical bond. The release rate of the PGR is linked to the biological activity of the phytoactive polymer and can be controlled by properties inherent in the whole macromolecular system. In this study the correlation of biological activity and plant growth regulator hydrolytic release rate was investigated for the series of newly synthesized 2,4-dichlorophenoxyacetic acid (2,4-D) polymeric esters. The polymers synthesized differ in their molecular weight, side group structure, and 2,4-D residue content. The influence of these polymer characteristics on the 2,4-D hydrolytic release was investigated, and it was demonstrated that hydrolysis rate substantially depends on the polymer molecular weight, side group structure, and 2,4-D residue content. It was also demonstrated that phytoactive polymer bioactivity depends on the hydrolysis rate of the polymers, and in dependence of this parameter can provide stimulating or inhibiting activity. Biological activity was illustrated by the elongation of wheat and barley coleoptiles.
ISSN:0721-7595
1435-8107
DOI:10.1007/s00344-006-0002-0