Mechanisms of Early Microbial Establishment on Growing Root Surfaces
Mechanisms of Early Microbial Establishment on Growing Root Surfaces
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DOI：
10.2136/vzj2015.06.0094
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发表时间：
2016-02-01
影响因子：
2.8
通讯作者：
Silk, Wendy K.
中科院分区：
文献类型：
--
作者：
Dupuy, Lionel X.;Silk, Wendy K.
植物根部周围土壤中的微生物活性有助于养分的生物利用度、作物生长以及土壤生物多样性和肥力。根际和根面的定殖特别需要在营养源丰富的根表面上早期建立。在这项研究中，我们调查了细菌和根表面之间发生的物理相互作用时，根尖进入土壤未开发的地区。我们开发了一个理论框架，概括了描述根生长运动学和细菌生长和根表面粘附的流行方法。我们发现根伸长率、细菌附着率和根冠承载力是成功建立的关键性状。模型还表明，趋化性是更重要的径向运输和粘附比细菌的纵向运动。控制细菌附着是有效的根定殖和随后的细菌在土壤中的扩散所必需的。本研究结果有助于了解土壤微生物群落结构和组成的建立。
Microbial activity in the soil surrounding plant roots contributes to nutrient bioavailability, crop growth, and soil biodiversity and fertility. Colonization of the rhizosphere and the rhizoplane in particular requires early establishment on root surfaces where sources of nutrients are abundant. In this study, we investigated the physical interactions taking place between bacteria and the root surface when a root tip enters unexplored regions of soil. We developed a theoretical framework that generalizes the prevailing approaches for describing root growth kinematics and bacterial growth and adhesion on root surfaces. We found that the root elongation rate, bacterial attachment rate, and root cap carrying capacity are key traits for successful establishment. Models also indicate that chemotaxis is more important for radial transport and adhesion than for longitudinal movement of bacteria. Controls on bacterial attachment are required for both efficient root colonization and subsequent dispersal of bacteria in soil. The findings of this study help to understand the establishment of the structure and composition of microbial communities in soil.