Iron inefficient and efficient oat cultivars. II. Characterization of phytosiderophore released in response to Fe deficiency stress

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Abstract
Iron-inefficient TAM 0-312 and Fe-efficient Coker 227 oats (Strategy II plants) differ in their release of phytosiderophore in response to iron-deficiency stress--the Fe-efficient Coker 227 releases a phytosiderophore whereas the Fe-inefficient TAM 0-312 does not. The phytosiderophore released by Coker 227 oats in response to Fe-deficiency stress does not appear to transport Fe into the plant as Fe3+phytosiderophore. When the Fe-inefficient TAM 0-312 and Fe-efficient Coker 227 oats were subjected to Fe supplied as Fe2+(BPDS)3, Fe3+HEDTA, as Fe3+EDDHA, Coker 227 utilized the Fe more efficiently than TAM 0-312 in every case. Both cultivars reduced Fe3+ as FeCl3 to form Fe2+(BPDS)3 and responded better to this form of Fe than Fe supplied as the ferric chelate. Reduction of Fe3+ at the root appears to be a factor that facilitates iron uptake by Coker 227 oats and the release of a phytosiderophore appears to make more Fe available at the root that can be reduced and transported to plant tops.