Interaction of an oligogalacturonide mixture with Cu2+ ion and its effect on tomato seedling roots
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Abstract
in the National Institute of Agricultural Sciences (INCA) from
citrus peel. This product is constituted by a mixture of ? 1-4
oligogalacturonides with a degree of polymerization between
7 and 16. Each galacturonide residue has a terminal carboxyl
group allowing the formation of complex with heavy metals. In
this work, a metal:ligand molar ratio of 1:1 and 1:2 between
oligogalacturonides and Cu2+ was established. Changes in
oligogalacturonide structures as a consequence of their bound
with Cu2+ ion were identified by IR-spectroscopy. On the other
hand, some trials were done to analyze the possibility that the
oligogalacturonides could protect tomato seedlings growing
at toxic levels of metal, being evidenced a bigger radical growth
and a decrease of the number of roots in the plants treated
with the product, effects that counteract those of toxicity for
heavy metals.
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