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Mycorrhizal stress alleviation in Senecio bonariensis Hook & Arn growing in urban polluted soils
Journal of Environmental Quality ( IF 2.4 ) Pub Date : 2021-03-08 , DOI: 10.1002/jeq2.20212
María Josefina Bompadre 1 , Matías Benavidez 2 , Roxana Paula Colombo 2 , Vanesa Analía Silvani 2 , Alicia Margarita Godeas 2 , Adalgisa Scotti 3 , Alejandro Guillermo Pardo 1 , Laura Fernández Bidondo 1
Affiliation  

Loss of biodiversity and accumulation of contaminants in urban soils and water bodies cause serious issues in metropolitan areas. The Matanza-Riachuelo river basin (metropolitan area of Buenos Aires, Argentina) is one of the most environmentally degraded regions in the world. Senecio bonariensis Hook & Arn (Asteraceae) grows in the periodically flooded soils of this wetland. This plant concentrates potentially toxic trace elements (PTEs) in its tissues and establishes symbiosis with arbuscular mycorrhizal (AM) fungi that collaborate with PTE phytostabilization in soils. The objective of this work was to evaluate tolerance and stress alleviation of AM-colonized S. bonariensis when transplanting and exposing to highly polluted environmental conditions of the river basin. Plants were initially inoculated with different AM strains and maintained in greenhouse conditions. After 6 mo, they were transplanted to the field. These plants showed a more equal distribution between shoot and root biomass production in comparison to field spontaneous S. bonaerensis plants. Plants in earlier contact with native soil inoculum showed positive correlation with phosphorus content and a significant increase of vesicle frequency. Plants belatedly contacted with native inoculum in the field (control) showed a higher catalase level that was positively correlated with the total colonization frequency and chlorophyll content. The ability to establish symbiosis with Rhizophagus intraradices (strain GC3), commonly used in the formulation of biofertilizers, was also analyzed. Plants inoculated with GC3 at the beginning of the assay showed lower colonization and were less efficient in the field. The preservation of spontaneous native plants with ornamental value and bioaugmentation of their associated microbiome can contribute to the stabilization of contaminants in soils.

中文翻译:

城市污染土壤中生长的千里光 Hook & Arn 菌根胁迫缓解

城市土壤和水体中生物多样性的丧失和污染物的积累在大都市区造成了严重的问题。Matanza-Riachuelo 河流域(阿根廷布宜诺斯艾利斯的都市区)是世界上环境退化最严重的地区之一。Senecio bonariensis Hook & Arn(菊科)生长在这片湿地周期性被洪水淹没的土壤中。这种植物将潜在有毒的微量元素 (PTE) 浓缩在其组织中,并与丛枝菌根 (AM) 真菌建立共生关系,这些真菌与土壤中的 PTE 植物稳定化合作。这项工作的目的是评估 AM 定植的S. bonariensis 的耐受性和缓解压力移栽和暴露于流域高度污染的环境条件时。植物最初用不同的 AM 菌株接种并保持在温室条件下。6个月后移植到田间。与田间自发的S. bonaerensis植物相比,这些植物在地上部和根部生物量产量之间表现出更均匀的分布。较早接触原生土壤接种物的植物与磷含量呈正相关,并且囊泡频率显着增加。与田间(对照)中的天然接种物接触较晚的植物显示出较高的过氧化氢酶水平,这与总定植频率和叶绿素含量呈正相关。与Rhizophagus intraradices建立共生关系的能力(菌株 GC3),通常用于生物肥料的配方,也进行了分析。在测定开始时接种 GC3 的植物表现出较低的定植并且在田间效率较低。保护具有观赏价值的自发本地植物及其相关微生物群的生物增强有助于稳定土壤中的污染物。
更新日期:2021-03-08
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