铅污染对黄褐土真菌群落多样性的影响
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国家自然科学基金(41401278), 安徽省自然科学基金(2008085MC97), 安徽农业大学国家级大学生创新训练基金(202110364069)和安徽农业大学省级大学生创新训练基金(S202010364183)共同资助。


Effect of lead pollution on fungicidal diversity in yellow-cinnamon soil
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    摘要:

    为研究重金属铅对黄褐土真菌群落组成和丰度的影响,采用室内培养试验(28 d),利用宏基组测序技术和稀释平板法,检测了不同浓度铅处理条件下黄褐土真菌的群落组成、丰度和可培养种群数量。结果表明,铅胁迫对真菌生物的抑制作用随着铅浓度的升高而增强,随着培养时间的延长而减弱。高浓度铅处理(2 500 mg·kg-1)在1~28 d均显著抑制了可培养真菌的数量。培养前期(1~7 d)对照处理的土壤真菌OTU和多样性指数最高,培养中后期(14~28 d)中浓度铅(500 mg·kg-1)处理的真菌OTU最高;重度铅污染处理(2 500 mg·kg-1)的真菌多样性在不同培养期均最低。在门水平上共检测到14个门,子囊菌门Ascomycota是黄褐土第一真菌门,其次是被孢霉门Mortierellomycota(培养1 d时的高浓度铅处理除外)和担子菌门Basidiomycota。铅添加1 d时,高浓度铅处理显著降低了Ascomycota的丰度;在7~28 d的培养期,Ascomycota的丰度随着铅浓度增加呈现增加趋势,Basidiomycota则呈现出先增加后降低的趋势,铅添加对Mortierellomycota的丰度影响不大。未知真菌群落(Unidentified和Unassigned)的丰度在培养期内均随土壤铅浓度的增加而减小。阐明了铅添加对黄褐土真菌多样性的影响规律,可为黄褐土铅污染的诊断和修复提供理论依据。

    Abstract:

    In order to study the effect of lead pollution on the fungal diversity in yellow cinnamon soil, the simulated culture experiment (28 days) was used to detect the community composition, abundance and culturable population of fungi in yellow cinnamon soil under different concentrations of lead by using Acer sequencing technology and Dilution plate method. The results showed that the inhibitory effect of lead stress on the fungal community was enhanced with the increase of lead concentration and weakened with the prolongation of culture time. High-concentration lead treatment (2 500 mg·kg-1) significantly inhibited the number of culturable fungi throughout the culture period. In the early stage of culture (1 - 7 d), the OTU and diversity indexes of soil fungi in the control treatment were the highest, but in the middle and late culture period (14 - 28 d),the OTU and diversity indexes of fungi in the middle-concentration lead (500 mg·kg-1) treatment were the highest. The fungal diversities of the high-concentration lead treatments (2 500 mg·kg-1) were the lowest during the whole culture period. Fourteen fungal phyla were detected at the phylum level. Ascomycota was the first dominant flora, followed by Mortierellomycota (except for the high-concentration lead treatment when cultured for 1 d) and Basidiomycota. When lead was added for 1 day, high-concentration lead treatment significantly decreased the abundance of Ascomycota, while which significantly increased the abundance of Basidiomycota. During the culture period of 7 - 28 days, the abundance of Ascomycota increased with the increase of lead concentration, while Basidiomycota increased first and then decreased. The addition of lead had little effect on the abundance of Mortierellomycota. The abundance of unknown fungal

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  • 在线发布日期: 2023-02-06