Record ID No. |
251 |
Author(s) |
Chen B.D., Jakobsen I., Roos P., Zhu Y.G. , 2005 |
Affiliation |
Chinese Academy of Science, Ecoenvironment Science Research Center, Department of Soil & Environmental Science, 18 Shang Qing Rd, Beijing 100085, Peoples R China |
Title |
Effects of the mycorrhizal fungus Glomus intraradices on uranium uptake and accumulation by Medicago truncatula L. from uranium-contaminated soil |
Source. Vol.(no):Page |
Plant and soil. 275(1-2): 349-359 p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Pollution |
Sub-subjects |
Soil pollution |
Host |
Medicago truncatula |
Organism |
Glomus intraradices |
Country |
China, Asia |
Abstracts |
Phytostabilization strategies may be suitable to reduce the dispersion of uranium (U) and the overall environmental risks of U-contaminated soils. The role of Glomus intraradices, an arbuscular mycorrhizal (AM) fungus, in such phytostabilization of U was investigated with a compartmented plant cultivation system facilitating the specific measurement of U uptake by roots, AM roots and extraradical hyphae of AM fungi and the measurement of U partitioning between root and shoot. A soil-filled plastic pot constituted the main root compartment (C-A) which contained a plastic vial filled with U-contaminated soil amended with 0, 50 or 200 mg KH2PO4-P kg(-1) soil (C-B). The vial was sealed by coarse or fine nylon mesh, permitting the penetration of both roots and hyphae or of just hyphae. Medicago truncatula plants grown in C-A were inoculated with G. intraradices or remained uninoculated. Dry weight of shoots and roots in C-A was significantly increased by G. intraradices, but was unaffected by mesh size or by P application in C-B. The P amendments decreased root colonization in C-B, and increased P content and dry weight of those roots. Glomus intraradices increased root U concentration and content in C-A, but decreased shoot U concentrations. Root U concentrations and contents were significantly higher when only hyphae could access U inside C-B than when roots could also directly access this U pool. The proportion of plant U content partitioned to shoots was decreased by root exclusion from C-B and by mycorrhizas (M) in the order: no M, roots in C-B > no M, no roots in C-B > M, roots in C-B > M, no roots in C-B. Such mycorrhiza-induced retention of U in plant roots may contribute to the phytostabilization of U contaminated environments. |