Chemical forms of iron in xylem sap from graminaceous and non-graminaceous plants

被引:46
作者
Ariga, Tomoko [1 ]
Hazama, Kenji [1 ]
Yanagisawa, Shuichi [1 ]
Yoneyama, Tadakatsu [1 ]
机构
[1] Univ Tokyo, Dept Appl Biol Chem, Bunkyo Ku, Tokyo 1138657, Japan
关键词
Citrate; graminaceous plants; iron-ligand; phytosiderophores; xylem sap; FERRIC-CHELATE REDUCTASE; ORYZA-SATIVA L; RICE PLANTS; NITRATE REDUCTASE; PHLOEM SAP; CITRATE; ROOT; TRANSLOCATION; NICOTIANAMINE; TRANSPORT;
D O I
10.1080/00380768.2014.922406
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Graminaceous plants can take up iron-phytosiderophore complexes, whereas non-graminaceous plants absorb ferrous ions after the reduction of ferric compounds at the root cell membranes. The iron (Fe) in the roots may be transported to the aerial plant parts through the xylem. We compared the chemical forms in xylem sap collected from the cut stems of three graminaceous plants (rice [Oryza sativa L.], maize [Zea mays L.], barley [Hordenum vulgare L.]) and three non-graminaceous plants (tomato [Lycopersicon esculentum Mill.], soybean [Glycine max Merr.], castor bean [Ricinus communis L.]) grown in composite soils for the concentrations of iron and iron-chelating compounds (nicotianamine, phytosiderophores, citrate). We also fractionated the xylem saps by size-exclusion chromatography to gain insight into the chemical forms of iron. The Fe concentrations in the xylem sap ranged from 9 to 40 mu M. Nicotianamine was found in the xylem sap from all the plants examined, with higher concentrations in the non-graminaceous plants. In contrast, phytosiderophores (2'-deoxymugineic acid and mugineic acid) were predominantly detected in the graminaceous plants. The concentrations of free citrate varied greatly (from 4 to 2200 mu M) among the six plant species. The xylem sap iron in non-graminaceous plants may form two types of Fe-citrate, whereas in graminaceous plants, the bound Fe forms may be largely two types of Fe-citrate with various Fe-phytosiderophores.
引用
收藏
页码:460 / 469
页数:10
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