不同濃度砷酸鹽脅迫對蜈蚣草根際微生物群落功能多樣性特征的影響
[Abstract]:Pteris vittata is the first arsenic superrich plant found in the world. Its rhizosphere microbes play an important role in arsenic transformation in soil and arsenic absorption of Pteris vittata. Using qPCR and Biolog-Eco microplate method, the functional diversity of rhizosphere microbial communities of centipede grass under arsenic stress was studied. The 16s rRNA gene abundance of rhizosphere microbes of Centipede was analyzed quantitatively, and then the average utilization rate of 31 carbon sources was analyzed by Biolog-Eco microplate method. Through principal component analysis, Pielou evenness index and Simpson dominance index of Shannon diversity index were used to study the differences in the utilization of different carbon sources by microorganisms and the effects of arsenic stress on microbial diversity. The results showed that arsenic stress not only reduced the 16s rRNA gene abundance and the number of microorganisms, but also significantly affected the microbial utilization efficiency of carbon source. The use of carbohydrates, amino acids and amines by microbes was most significantly affected by arsenic stress. In addition, arsenic stress can induce arsenic-resistant microorganisms to become dominant communities, and the structure tends to be single. Since long-term exposure can increase the number of rhizosphere microbes in Centipede grass, the role of specific carbon sources in root exudates of Pteris vittata in the process of strengthening microorganism Pteris vittata to repair arsenic contaminated soil can be studied in later stage.
【作者單位】: 南京大學環(huán)境學院污染控制與資源化國家重點實驗室;
【基金】:江蘇省博士研究生創(chuàng)新項目(KYLX_0052) 南京大學優(yōu)秀博士研究生創(chuàng)新能力提升計劃B(201601B010)
【分類號】:X17
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