Castignetti D, Smarrelli J
Biochem Biophys Res Commun. 1984 Nov 30;125(1):52-8. doi: 10.1016/s0006-291x(84)80332-0.
Squash cotyledon NADH:nitrate reductase catalyzes the reduction of the siderophore ferrioxamine B. The enzyme also reduced ferric ion in a buffer system containing the chelators oxalate and maleate. Ferrioxamine B reduction was maximal at pH 4; ferric ion reduction was maximal at pH 8. The present study indicates that iron assimilation by higher plants may occur with microbial siderophores serving as ferric ion sources and nitrate reductase functioning as the siderophore reductase.
南瓜子叶NADH：硝酸还原酶催化铁载体高铁载体B的还原。该酶还能在含有螯合剂草酸盐和马来酸盐的缓冲体系中还原铁离子。高铁载体B的还原在pH 4时达到最大值；铁离子的还原在pH 8时达到最大值。本研究表明，高等植物的铁同化可能发生在以微生物铁载体作为铁离子来源且硝酸还原酶作为铁载体还原酶的情况下。
