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A dormant amoeba species can selectively sense and predate on different soil bacteria
Functional Ecology ( IF 5.2 ) Pub Date : 2021-05-09 , DOI: 10.1111/1365-2435.13824
Longfei Shu 1, 2 , Zhenzhen He 1 , Xiaotong Guan 1 , Xueqin Yang 1 , Yuehui Tian 1 , Siyi Zhang 1 , Chenyuan Wu 1 , Zhili He 1 , Qingyun Yan 1 , Cheng Wang 1 , Yijing Shi 2, 3
Affiliation  

  1. Soil protists are the invisible majority of soil eukaryotes, which are essential but often forgotten parts of the soil ecosystem. They play key roles in microbial food webs by predating on other soil microbes. However, it is not clear how dormant soil protists sense, recognize and feed on diverse microbial prey.
  2. In this study, we used a soil amoeba, Dictyostelium discoideum, to study selective discrimination and predation of 14 different bacteria. We found that discrimination and sensing of prey in D. discoideum started as early as resting spores. Dictyostelium discoideum had higher hatching rates, formed bigger amoeba plaques and preferred high nutritional value bacteria. The feeding speed of amoeba on various bacteria was constant and was not linked with sensing of prey or bacterial nutritional value. We also found that higher bacterial density decreased predation efficiency, and one species, P. fluorescens, induced a strong density-dependent inhibition of amoeba spore production.
  3. In conclusion, we find that dormant D. discoideum can selectively sense and predate on different soil bacteria, a process that is likely mediated through active amoeba preference as well as bacterial inhibition. This study provides new insights into the role of protists in shaping soil bacterial communities, and future study needs to assess this in natural soil environments.


中文翻译:

休眠的变形虫物种可以选择性地感知和捕食不同的土壤细菌

  1. 土壤原生生物是土壤真核生物中看不见的大多数,它们是土壤生态系统中必不可少但经常被遗忘的部分。它们通过捕食其他土壤微生物在微生物食物网中发挥关键作用。然而,目前尚不清楚休眠的土壤原生生物如何感知、识别和以不同的微生物猎物为食。
  2. 在本研究中,我们使用土壤变形虫盘基网柄菌( Dictyostelium discoideum ) 来研究对 14 种不同细菌的选择性区分和捕食。我们发现D 中对猎物的辨别和感知。discoideum早在静止孢子时就开始了。盘基网柄 具有较高的孵化率,形成较大的阿米巴菌斑和优先选择高营养价值的细菌。变形虫对各种细菌的摄食速度是恒定的,与对猎物或细菌营养价值的感知无关。我们还发现较高的细菌密度会降低捕食效率,一种物种P . 荧光素,诱导对变形虫孢子产生的强烈密度依赖性抑制。
  3. 总之,我们发现休眠的Ddiscoideum可以选择性地感知和捕食不同的土壤细菌,这一过程可能是通过活跃的变形虫偏好以及细菌抑制来介导的。这项研究为原生生物在塑造土壤细菌群落中的作用提供了新的见解,未来的研究需要在自然土壤环境中对此进行评估。
更新日期:2021-05-09
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