Functional roles of Cercozoa in the rhizosphere and phyllosphere of plants (CERCOPLANT)

尾虫在植物根际和叶际中的功能作用 (CERCOPLANT)

• 批准号: 209156033
• 负责人: Professor Dr. Michael Bonkowski
• 金额: --
• 依托单位: Arbeitsgruppe Terrestrische Ökologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/209156033?language=en
• 关键词: Functional; roles; Cercozoa; rhizosphere; phyllosphere

Protozoa are the dominant bacterial grazers in terrestrial systems and often exert significant positive effects on plant growth, due to (1) the release of growth-limiting nutrients from consumed bacterial biomass and (2) changes in bacterial community composition and function. However, information on the species identity, the diversity and on differences in the functional roles of specific soil protozoan taxa is largely lacking. Among soil protozoa, the Cercozoa (Cercomonadida) are a highly diverse, and probably the most productive group of terrestrial flagellates. The project aims to determine the species identity and to quantify the diversity of Cercozoa in the rhizosphere and phyllosphere of plants and to link specific phylogenetic and phenotypic traits of the cercomonads to grazing-induced changes in bacterial community composition and function in space and time. The project will further investigate the degree of functional redundancy and complementarity of cercozoan taxa in the plant rhizosphere, and their in situ effects on the diversity of bacteria and on plant performance. In the phyllosphere, the project will investigate the spatial metapopulation dynamics of Cercozoa and different phyllosphere bacterial taxa and model the spatial and temporal dynamics of these predator-prey dynamics in order to characterize the underlying mechanisms and identify the functional traits of Cercozoa and bacteria that define their central role in phyllosphere community dynamics.

原生动物是陆地生态系统中的主要食草动物，它们对植物的生长具有显著的积极影响，主要是由于（1）消耗的细菌生物量释放出限制生长的营养物质，（2）改变细菌群落的组成和功能。然而，在物种的身份，多样性和具体的土壤原生动物类群的功能作用的差异的信息是在很大程度上缺乏。在土壤原生动物中，尾原虫（Cercomonadida）是一种高度多样化的，可能是最具生产力的陆生鞭毛虫。该项目的目的是确定物种身份，量化植物根际和叶际中尾藻的多样性，并将尾藻的特定系统发育和表型特征与放牧引起的细菌群落组成和功能在空间和时间上的变化联系起来。该项目将进一步调查植物根际尾虫分类群的功能冗余和互补程度，以及它们对细菌多样性和植物性能的原位影响。在叶圈，该项目将调查尾藻和不同叶圈细菌类群的空间集合种群动态，并模拟这些捕食者-被捕食者动态的空间和时间动态，以描述潜在的机制，并确定尾藻和细菌的功能特征，这些功能特征决定了它们在叶圈群落动态中的核心作用。