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题名: Chromium immobilization by extraradical mycelium of arbuscular mycorrhiza contributes to plant chromium tolerance
作者: Wu, Songlin; Zhang, Xin; Chen, Baodong; Wu, Zhaoxiang; Li, Tao; Hu, Yajun; Sun, Yuqing; Wang, Youshan
刊名: ENVIRONMENTAL AND EXPERIMENTAL BOTANY
出版日期: 2016-02
卷号: 122, 页码:10-18
关键词: Arbuscular mycorrhiza ; Cr tolerance ; Phosphorus ; Cr immobilization ; SR mu-XRF
DOI: 10.1016/j.envexpbot.2015.08.006
部门归属: 城市与区域生态国家重点实验室
英文摘要: Arbuscular mycorrhizal (AM) fungi, as important plant mutualists, can protect host plants against environmental stresses, including heavy metal contaminations. It is generally accepted that improvement of plant P nutrition by AM symbiosis plays an important role in plant tolerance to heavy metals. In the present study, we tested if exogenous P amendment to the chromium (Cr) contaminated soil could match the positive effects of AM symbiosis on plant Cr tolerance for the highly mycorrhizal dependent plant dandelion (Taraxacum platypecidum Diels.). Experimental results showed that P addition could not enhance plant growth as well as AM symbiosis did. AM fungi could immobilize Cr in mycorrhizal roots besides enhancing plant P acquisition. Cr distribution pattern in principal roots as revealed by synchrotron radiation micro-focused X-ray fluorescence (SR mu-XRF) analysis supported the stabilization of Cr in mycorrrihzal roots. Furthermore, by using a three-compartment cultivation system, we demonstrated that extraradical mycelium (ERM) could take up and transport Cr to mycorrhizal roots, but restrained Cr translocation from roots to shoots, and thus contributed to Cr immobilization in roots and relieved Cr phytotoxicity. (C) 2015 Elsevier B.V. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35538
Appears in Collections:城市与区域生态国家重点实验室_期刊论文

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