Uptake of cadmium from an experimentally contaminated calcareous soil by arbuscular mycorrhizal maize (Zea mays L.)
Uptake of cadmium from an experimentally contaminated calcareous soil by arbuscular mycorrhizal maize (Zea mays L.)
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DOI：
10.1007/s00572-003-0281-2
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发表时间：
2004-12-01
期刊：
影响因子：
3.9
通讯作者：
Christie, P
中科院分区：
文献类型：
--
作者：
Chen, BD;Liu, Y;Christie, P
我们在两个温室实验中研究了接种了苔藓球囊霉的丛枝菌根 (AM) 玉米对低磷砂质钙质土壤中镉的吸收情况。植物在含有两个隔室的盆中生长，一个用于根和菌丝生长，另一个仅用于菌丝发育。将三种浓度的Cd（0、25和100 mg kg(-1)）和两种浓度的P（20和60 mg kg(-1)）分别施用到两个隔室中以评估菌丝对Cd的吸收。添加 Cd 和 P 都不会抑制 AM 真菌在根部的定殖，但 Cd 会降低植物生物量。菌根定植、磷添加和镉添加水平的增加导致枝条中镉的分配减少。在所研究的所有镉水平下，菌根定植均增强了植物对磷的吸收。当向植物区室添加 Cd，向菌丝区室添加 P 时，植物生物量随着 AM 定植而增加，并且随着 Cd 添加量的增加，菌根效应更加明显。当向植物区室添加P、向菌丝区室添加Cd时，植物生物量受AM定植的影响很小，但在低Cd添加率（25 mg kg(-1)）下，地上部Cd吸收量因定植而增加，而在高Cd添加率（100 mg kg(-1)）下则降低，但根部Cd吸收量没有差异。这些影响可能是由于真菌菌丝体对 Cd 的固定或 AM 真菌对根际物理化学条件的影响，并结合 AM 植物对污染场地可能的植物稳定作用进行了讨论。
We investigated uptake of Cd by arbuscular mycorrhizal (AM) maize inoculated with Glomus mosseae from a low-P sandy calcareous soil in two glasshouse experiments. Plants grew in pots containing two compartments, one for root and hyphal growth and one for hyphal development only. Three levels of Cd (0, 25 and 100 mg kg(-1)) and two of P (20 and 60 mg kg(-1)) were applied separately to the two compartments to assess hyphal uptake of Cd. Neither Cd nor P addition inhibited root colonization by the AM fungus, but Cd depressed plant biomass. Mycorrhizal colonization, P addition and increasing added Cd level led to lower Cd partitioning to the shoots. Plant P uptake was enhanced by mycorrhizal colonization at all Cd levels studied. When Cd was added to the plant compartment and P to the hyphal compartment, plant biomass increased with AM colonization and the mycorrhizal effect was more pronounced with increasing Cd addition. When P was added to the plant compartment and Cd to the hyphal compartment, plant biomass was little affected by AM colonization, but shoot Cd uptake was increased by colonization at the low Cd addition rate (25 mg kg(-1)) and lowered at the higher Cd rate (100 mg kg(-1)) but with no difference in root Cd uptake. These effects may have been due to immobilization of Cd by the fungal mycelium or effects of the AM fungus on rhizosphere physicochemical conditions and are discussed in relation to possible phytostabilization of contaminated sites by AM plants.