Lalancette Steve, Lerat Sylvain, Roy Sébastien, Beaulieu Carole
Département de Biologie, Université de Sherbrooke, Sherbrooke, Canada.
Mycobiology. 2019 Sep 18;47(4):415-429. doi: 10.1080/12298093.2019.1660297. eCollection 2019.
Soil contamination by metals is of particular interest, given that their retention times within the profile can be indefinite. Thus, phytostabilization can be viewed as a means of limiting metal toxicity in soils. Due to their ability to grow on contaminated soils, alders have repeatedly been used as key species in phytostabilization efforts. Alder ability to grow on contaminated sites stems, in part, from its association with microbial endophytes. This work emphasizes the fungal endophytes populations associated with ssp. and ssp. (previously ssp. ) under a phytostabilization angle. Fungal endophytes were isolated from alder trees that were growing on or near disturbed environments; their tolerances to Cu, Ni, Zn, and As, and acidic pH (4.3, 3, and 2) were subsequently assessed. spp. and spp. were identified as fungal endophytes of for the first time. When used as inoculants for alder, some isolates promoted plant growth, while others apparently presented antagonistic relationships with the host plant. This study reports the first step in finding the right fungal endophytic partners for two species of alder used in phytostabilization of metal-contaminated mining sites.
鉴于金属在土壤剖面中的留存时间可能是无限的，金属对土壤的污染尤其值得关注。因此，植物稳定化可被视为限制土壤中金属毒性的一种手段。由于桤木能够在受污染土壤上生长，它在植物稳定化工作中反复被用作关键物种。桤木在受污染场地生长的能力部分源于其与微生物内生菌的关联。这项工作从植物稳定化的角度着重研究了与桤木亚种和桤木亚种（以前的桤木亚种）相关的真菌内生菌群。从生长在受干扰环境附近或之上的桤木树上分离出真菌内生菌；随后评估了它们对铜、镍、锌、砷以及酸性pH值（4.3、3和2）的耐受性。桤木内生菌属和桤木内生菌属首次被鉴定为桤木的真菌内生菌。当用作桤木的接种剂时，一些分离菌株促进了植物生长，而其他一些菌株显然与宿主植物呈现出拮抗关系。本研究报告了为用于金属污染矿区植物稳定化的两种桤木寻找合适的真菌内生伙伴的第一步。
