Permeability of Plant Young Root Endodermis to Cu Ions and Cu-Citrate Complexes in Corn and Soybean
| Autor: | Wenrui Lei, Chunling Luo, Zhenguo Shen, Yanzhao Fu |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Copper ferrocyanide
Plant Science Plant Roots Zea mays Permeability Cell wall chemistry.chemical_compound Cell Wall Xylem Botany Sodium citrate Environmental Chemistry Soil Pollutants Citrates Chelating Agents Chemistry fungi food and beverages Pollution Apoplast Biodegradation Environmental Permeability (electromagnetism) Stele Endodermis Soybeans Nuclear chemistry |
| Zdroj: | International journal of phytoremediation. 17(9) |
| ISSN: | 1549-7879 |
| Popis: | The non-selective apoplastic passage of Cu and Cu-citrate complexes into the root stele of monocotyledonous corn and dicotyledonous soybean was investigated using an inorganic-salt-precipitation technique. Either Cu ions or Cu-citrate complexes were drawn into root through the apoplast from the root growth medium, and K4[Fe(CN)6] was subsequently perfused through xylem vessels or the entire root cross section. Based on microscopic identification of the reddish-brown precipitates of copper ferrocyanide in the cell walls of the xylem of corn and soybean roots, Cu(2+) passed through the endodermal barrier into the xylem of both species. When the solution containing 200 μM CuSO4 and 400 μM sodium citrate (containing 199.98 μM Cu-citrate, 0.02 μM Cu(2+)) was drawn via differential pressure gradients into the root xylem while being perfused with K4[Fe(CN)6] through the entire root cross-section, reddish-brown precipitates were observed in the walls of the stele of soybean, but not corn root. However, when a CuSO4 solution containing 0.02 or 0.2 μM free Cu(2+) was used, no reddish-brown precipitates were detected in the stele of either of the two plants. Results indicated that endodermis was permeable to Cu-citrate complexes in primary roots of soybean, but not corn. The permeability of the endodermal barrier to the Cu-citrate complex may vary between dicotyledonous and monocotyledonous plants, which has considerable implications for chelant-enhanced phytoextraction. |
| Databáze: | OpenAIRE |
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