Toxic metal tolerance of Aspergillusflavus and Aspergillus nidulansisolated from tailings

IF 0.6 4区农林科学 Q3 Agricultural and Biological Sciences

Revista Chapingo Serie Ciencias Forestales Y Del Ambiente Pub Date : 2022-04-30 DOI:10.5154/r.rchscfa.2021.02.009

A. G. Villalba-Villalba, L. Chan-Chan, A. Maldonado-Arce

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引用次数: 1

Abstract

Introduction: Metals are found naturally in the environment, but their indiscriminate use has caused serious pollution problems. Objective: Two species of Aspergillus were isolated and identified from tailings, then their tolerance index at different concentrations of several metals was evaluated. Materials and methods: Fungi were isolated from tailings located in the Sonoran Desert. Fungal growth was evaluated in the presence of Cr6+, Pb2+, Zn2+, Ag+, Cd2+, Cu2+ and Hg2+ metals using the tolerance index and minimum inhibitory concentration (MIC). Results and discussion: A. flavus had very high tolerance indices to Cr6+, Pb2+ and Zn2+ at all concentrations evaluated (>20 mM); it also had a high tolerance index to the other metals at lower concentrations. The MIC for this fungus in the presence of Cd2+, Hg2+ and Ag+ was recorded between 5 and 10 mM. The growth of A. nidulans was not inhibited with 20 mM of Cr6+. The MIC of A. nidulans in presence of Hg2+, Ag+ and Cu2+ is in the range 1-5 mM; with Cd2+, Pb2+ and Zn2+ it is in the range between 15 and 20 mM. The dose-response curves display a characteristic sigmoidal shape. With Ag+ and Cu2+A. flavus displayed a hermetic behavior. Conclusion: High metal tolerance of these fungi suggests their potential use in the removal of metals.

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从尾矿中分离的黄曲霉和灰曲霉对有毒金属的耐受性

金属是自然存在于环境中的，但它们的滥用已经造成了严重的污染问题。目的:从尾矿中分离鉴定两种曲霉，评价其对不同浓度几种金属的耐受性。材料和方法:从索诺兰沙漠的尾矿中分离真菌。采用耐受性指数和最小抑制浓度(MIC)评价了真菌在Cr6+、Pb2+、Zn2+、Ag+、Cd2+、Cu2+和Hg2+金属存在下的生长情况。结果与讨论:黄曲霉对Cr6+、Pb2+和Zn2+的耐受性指数在所有评价浓度(bbb20 mM)下都很高;在较低浓度下对其他金属也有较高的耐受指数。在Cd2+、Hg2+和Ag+的作用下，该真菌的MIC值在5 ~ 10 mM之间。20mm的Cr6+对该真菌的生长没有抑制作用。在Hg2+、Ag+和Cu2+存在下，毛竹的MIC在1 ~ 5mm范围内;Cd2+、Pb2+和Zn2+在15 ~ 20 mM范围内，剂量响应曲线呈典型的s型曲线。用Ag+和Cu2+A。黄曲霉表现出一种封闭的行为。结论:这些真菌具有较高的金属耐受性，在金属去除方面具有潜在的应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Chapingo Serie Ciencias Forestales Y Del Ambiente FORESTRY-

CiteScore

1.20

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： The Revista Chapingo Serie Ciencias Forestales y del Ambiente (RCHSCFA) is a scientific journal that aims to raise awareness of high-quality research products related to forest, arid, temperate and tropical environments in the world. Since its foundation in 1994, the RCHSCFA has served as a space for scientific dissemination and discussion at a national and international level among academics, researchers, undergraduate and graduate students, forest managers and public/private entities that are interested in the forest environment. All content published in the journal first goes through a strict triple-blind review process and is published in the following formats: Scientific Articles, Review Articles, Methodologies, Technical or Technological Notes.