THE EFFECTS OF CADMIUM ON ECTOMYCORRHIZAL PINUS-SYLVESTRIS L
THE EFFECTS OF CADMIUM ON ECTOMYCORRHIZAL PINUS-SYLVESTRIS L
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DOI：
10.1111/j.1469-8137.1993.tb03742.x
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发表时间：
1993-02-01
期刊：
影响因子：
9.4
通讯作者：
VANASSCHE, JA
中科院分区：
文献类型：
--
作者：
COLPAERT, JV;VANASSCHE, JA
研究了亚致死浓度镉对樟子松外生菌根苗的毒性。从锌和镉污染的土壤或未污染的地区采集的9株菌根菌株，比较了它们提高宿主植物对Cd的耐性的能力。植物是在半水培系统中种植的，这样可以直观地观察根系。测定了土壤定殖度和菌丝密度。在处理期间，对寄主植物的水分利用进行了仔细的监测。测定了植物各部位的镉浓度。虽然Cd的添加降低了非菌根植物的蒸腾作用，但在菌根松树中水分关系的干扰可能或多或少地明显。处理强烈地影响了基质中真菌的生长：几个真菌在污染的基质中几乎不能存活。菌丝生物量大的真菌在克服毒性方面表现出最大的效果。一些S列车在经过镉处理后，甚至能够提高营业额增长。在密集的菌丝体中，Cd的保留潜力增加，而单个菌丝暴露在比稀疏菌丝体中更低的Cd浓度中。由于非菌根幼苗对Cd的吸收最高，所以所有的真菌对寄主中的Cd毒害都有保护作用。处理对幼苗的生长和其他阳离子的浓度没有影响，可能是由于毒性相对较低和观察期较短所致。讨论了这些结果与真菌体外对Cd的耐受性之间的关系。
The toxicity of a sublethal cadmium concentration to ectomycorrhizal Pinus sylvestris L. seedlings was studied. Nine mycorrhizal strains, collected from a Zn- and Cd-polluted soil or from an unpolluted area, were compared for their ability to increase Cd tolerance in their host plant. Plants were cultivated in a semi-hydroponic system that allowed visual observation of the root systems. The degree of soil colonization as well as the density of the extramatrical mycelium was determined. The water use of the host plants was carefully monitored during the treatment period. Cadmium concentrations were determined in all plant parts. Although Cd addition resulted in decreases in transpiration in the non-mycorrhizal plants, disturbances in water relations could be more or less pronounced in the mycorrhizal pines. The treatment strongly influenced the growth of the fungi in the substrate: several mycobionts hardly survived in the polluted substrate. Fungi producing a large mycelial biomass showed the greatest effect in overcoming toxicity. Some s trains were even able to increase their turnover growth when treated with cadmium. In a dense extramatrical mycelium the potential for Cd retention increases, while the individual hyphae are exposed to a lower Cd concentration than in a sparse mycelium. A protective effect against cadmium toxicity in the host was observed with all mycobionts, since Cd uptake was highest in the non-mycorrhizal seedlings. The treatment had no effect on the growth of the seedlings or on the concentrations of the other cations, probably due to the relatively low toxicity and the relatively short observation period. The results are discussed in relation to the in vitro Cd tolerance of the fungi.