Articles
UPTAKE OF FE(O,O-EDDHA) ISOMERS BY STRATEGY I AND II PLANTS
Article number
697_70
Pages
535 – 542
Language
English
Abstract
Higher plants are able to develop two different strategies in order to increase iron availability in soils.
Strategy I is developed by dicot and non-graminaceous monocot species.
Strategy II is developed by graminaceous species.
In soils and/or irrigation waters with high bicarbonate content, the activity of Strategy I can be neutralized, causing severe iron deficiency in crops that must be supplied with iron.
The iron fertilizer that yields better result consist of the iron chelate Fe(o,o-EDDHA). This chelate forms two different groups of isomers when the chelating agent (o,o-EDDHA) is linked to iron: the meso (50%) and racemic (50%) isomers.
These isomers show different stability constants, the isomer d,l-racemic is 500-fold more stable than the meso form.
The aim of this research was to test if plants took up iron in a different way depending on the isomer and the kind of strategy developed by plants under Fe deficiency.
The meso and d,l-racemic Fe(o,o-EDDHA), the free (o,o-EDDHA) and pH were measured in the nutrient solution.
Oats plants (Strategy II) took up iron from both Fe(o,o-EDDHA) isomers equally and did not take up the chelating agent.
Pepper plants (Strategy I) took up only iron from the meso form and (o,o-EDDHA) was likely kept temporally in the root apoplast.
Strategy I is developed by dicot and non-graminaceous monocot species.
Strategy II is developed by graminaceous species.
In soils and/or irrigation waters with high bicarbonate content, the activity of Strategy I can be neutralized, causing severe iron deficiency in crops that must be supplied with iron.
The iron fertilizer that yields better result consist of the iron chelate Fe(o,o-EDDHA). This chelate forms two different groups of isomers when the chelating agent (o,o-EDDHA) is linked to iron: the meso (50%) and racemic (50%) isomers.
These isomers show different stability constants, the isomer d,l-racemic is 500-fold more stable than the meso form.
The aim of this research was to test if plants took up iron in a different way depending on the isomer and the kind of strategy developed by plants under Fe deficiency.
The meso and d,l-racemic Fe(o,o-EDDHA), the free (o,o-EDDHA) and pH were measured in the nutrient solution.
Oats plants (Strategy II) took up iron from both Fe(o,o-EDDHA) isomers equally and did not take up the chelating agent.
Pepper plants (Strategy I) took up only iron from the meso form and (o,o-EDDHA) was likely kept temporally in the root apoplast.
Authors
S. Alcañiz, M. Cerdán, M. Juárez, J.D. Jordá, D. Bermúdez, A. Sánchez
Keywords
Fe (o,o-EDDHA), Strategy I, Strategy II, iron uptake, oats, pepper
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