EFFECT OF EDTA ON TRANSPORT FORMS OF MANGANESE IN MAIZE XYLEM EXUDATE

被引：4

作者：

EBEID, MM ^{[1
]}

KUTACEK, M ^{[1
]}

机构：

[1] CZECH ACAD SCI,INST EXPTL BOT,CS-16630 PRAHA 6,CZECHOSLOVAKIA

来源：

BIOLOGIA PLANTARUM | 1979年 / 21卷 / 03期

关键词：

D O I：

10.1007/BF02884564

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Xylem exudates were collected from 20-day-old maize seedlings grown for 24 h in labelled manganese chloride solution (10 ppm) with or without EDTA (18 mgl-1). The distribution of radioactivity on paper ohromatograms of exudates did not show the existence of free Mn. Fractionation of exudate constituents by gel filtration on Sephadex G-26 showed that54Mn is associated with three UV (254 nm) -absorbing fractions. Two fractions contain amino acids (M. wt.:≧ 10 000 and ∼ 900). The third fraction (M. wt. ∼ 600) however, appears to be a carrier of a different type, which is practically amino acid free, although it contains 10.23% N (by elementary analysis). The properties of this carrier are discussed. Application of EDTA has favoured the; transport of Mn in xylem sap with fractions of relatively lower molecular weights. © 1979 Academia.

引用

页码：178 / 182

页数：5

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