农田土壤病毒荧光显微计数法优化
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1.沈阳农业大学土地与环境学院;2.沈阳农业大学

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Optimization of Virus Enumeration in Epifluorescence Microscopy for Farmland Soil
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1.National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources /Ministry of Agriculture and Rural Affairs Key Laboratory of Arable Land Conservation in Northeast China,College of Land and Environment,Shenyang Agricultural University;2.China;3.Shenyang agricultural university

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    摘要:

    病毒在土壤微生物群落结构及宿主动态调控中发挥重要作用。受土壤环境复杂性影响,土壤病毒的有效提取和计数仍然面临诸多挑战。本研究通过病毒提取和显微观察条件优化,以提高土壤病毒荧光显微检测的效率。选取沈阳农业大学棕壤长期定位施肥实验站土壤,评估三种关键因素对土壤病毒提取效率及荧光显微计数结果的影响:(1)防荧光淬灭方法(防淬灭剂Fluoromount-GTM和实验室制备防褪色剂);(2)破碎方式(手持搅拌棒、涡旋混合器、超声波细胞粉碎机、水浴摇床);(3)土壤与提取液比例(30:100和50:100;质量:体积)。采用SYBR Green I核酸染料对病毒颗粒进行染色,并利用荧光显微镜观察和计数。将所得优化方案应用于棕壤、黑土与草甸土,以验证其普遍性。结果表明:在荧光显微镜检测过程中,不使用任何防荧光淬灭剂(防褪色剂或防淬灭剂)时病毒颗粒在100×显微镜下难以观察,而使用防淬灭剂(Fluoromount-GTM)后,病毒计数提升至3.75 × 108 Virus-Like Particles(VLPs) g-1,显著优于使用防褪色剂。此外,破碎方式显著影响病毒提取效率(P < 0.05),其中手持搅拌棒(650 W,50 Hz)处理3 min的提取效率最高,显著优于涡旋混合器和水浴摇床,而使用超声波细胞粉碎机未能检测到病毒颗粒。土液比的增加显著提升病毒提取效率(P < 0.05),土液比为50:100时的病毒数量较30:100时提高了1227.10%。三种类型土壤验证结果显示,优化方法在供试土壤中均能获得稳定、可靠的病毒计数结果,且不同类型土壤间病毒丰度差异显著。综上所述,本研究通过优化破碎方式、土液比及防淬灭剂选择,建立了一种高效、稳定且适用性较广的土壤病毒荧光显微计数方法,可有效提高土壤病毒的提取效率和荧光显微镜计数效果,为土壤病毒生态学研究提供技术支持。

    Abstract:

    【Objective】Viruses play a crucial role in regulating soil microbial community and host dynamics. However, the efficient extraction and enumeration of soil viruses remain challenging due to the complexity of soil environments. This study aimed to enhance the efficiency of soil virus detection by optimizing both the viral extraction protocol and epifluorescence microscopy observation conditions. 【Method】Soil samples were collected from the long-term brown soil fertilization experimental station at Shenyang Agricultural University. Three key factors affecting soil virus extraction efficiency and enumeration results were evaluated: (1) antifade agents (the commercial anti-quenching agent Fluoromount-G? and a laboratory-prepared antifade agent); (2) disruption methods (blender, vortex mixer, ultrasonic cell disruptor, and water bath shaker); and (3) soil-to-liquid ratios (30:100 and 50:100; mass: volume). Viral particles were stained using SYBR Green I and enumerated under an epifluorescence microscope. The optimized protocol was subsequently applied to brown soil, black soil, and meadow soil to validate its general applicability. 【Result】Without an antifade agent (Fluoromount-GTM or laboratory-prepared antifade agent), viral particles were difficult to observe under 100× magnification. The application of Fluoromount-GTM significantly increased virus counts to 3.75 × 108 virus-like particles (VLPs) g-1, outperforming the laboratory-prepared antifade agent. Disruption method significantly affected virus extraction efficiency (P < 0.05). The blender (650 W, 50 Hz) treatment for 3 minutes achieved the highest extraction efficiency, significantly surpassing the vortex mixer and water bath shaker, whereas no viral particles were observed with the ultrasonic cell disruptor treatment. Increasing the soil-to-liquid ratio also significantly enhanced virus extraction efficiency (P < 0.05), with the 50:100 ratio resulting in a 1227.10% increase in virus counts compared to the 30:100 ratio. Validation results demonstrated that the optimized method consistently yielded stable and reliable viral counts across all three soil types, with significant differences in viral abundance observed among them, confirming its broad applicability. 【Conclusion】In summary, this study established an efficient, stable, and widely applicable epifluorescence microscopy method for soil virus enumeration through the systematic optimization of the disruption method, soil-to-liquid ratio, and antifade agent. The optimized method significantly enhances the extraction efficiency and counting accuracy of soil viruses, thereby providing robust technical support for soil viral ecology research.

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王丰,刘灵芝,刘蕊,郭冰清,孟奥,陈美慧,安婷婷,汪景宽.农田土壤病毒荧光显微计数法优化[J].土壤学报,,[待发表]
WANG Feng, LIU Lingzhi, LIU Rui, GUO Bingqing, MENG Ao, Chen Meihui, AN Tingting, WANG Jingkuan. Optimization of Virus Enumeration in Epifluorescence Microscopy for Farmland Soil[J]. Acta Pedologica Sinica,,[In Press]

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  • 收稿日期:2025-08-31
  • 最后修改日期:2026-01-12
  • 录用日期:2026-02-13
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