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- Title
Correlation between Plant Growth Regulator Release Rate and Bioactivity for the Series of Newly Synthesized Phytoactive Polymers.
- Authors
Shtilman, Michael I.; Tzatzarakis, Manolis N.; Voskanyan, Potvakan S.; Tsakiris, Ioannis N.; Tsakalof, Andreas K.; Tsatsakis, Aristidis M.
- Abstract
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.
- Subjects
PLANT polymers; MOLECULAR structure; BIOACTIVE compounds; PLANT products; HYDROLYSIS; EFFECT of dichlorophenoxyacetic acid on plants; PHYSIOLOGICAL effects of dichlorophenoxyacetic acid; PLANT growth inhibiting substances; PLANT growth promoting substances
- Publication
Journal of Plant Growth Regulation, 2006, Vol 25, Issue 3, p211
- ISSN
0721-7595
- Publication type
Article
- DOI
10.1007/s00344-006-0002-0