Root-Pore Interactions, the Underestimated Driver for Rhizosphere Structure and Rhizosheath Development.

IF 6.3 1区 生物学 Q1 PLANT SCIENCES
Maik Geers-Lucas, Andrey Guber, Alexandra Kravchenko
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Abstract

Physical characteristics of rhizosphere and rhizosheath, that is, root-adhering soil, are crucial for plant performance. Yet, the drivers of the rhizosphere's structural properties and their relationships with rhizosheath development remain unclear. We used X-ray computed micro-tomography (i) to explore two drivers of rhizosphere porosity: root-induced changes vs. preferential root growth into soil with certain pore characteristics and (ii) to estimate their contributions to rhizosphere macroporosity gradients and rhizosheath formation. Rhizosheath development was assessed in relation to rhizosphere macroporosity and rhizodeposition after ¹⁴C labeling. Our results confirmed that both root-induced changes and growth preferences shape rhizosphere structure, with their relative significance depending on the inherent macropore availability. In intact soils, growth preferences were the dominant factor, while in sieved soils the root-induced changes became equally important. Rhizosheath formation was associated with roots compacting their surrounding and releasing carbon. However, no correlation was found between rhizosheath formation and the actual rhizosphere, that is, the volume of soil adjacent to the roots. The study offers new process-level understanding of rhizosphere porosity gradients, while emphasizing caution in interpreting root growth data from sieved soil studies. Similarly, traditional destructively sampled rhizosheath may not fully capture the true characteristics of the actual rhizosphere, underscoring importance of intact-soil analyses.

根孔相互作用:根际结构和根鞘发育被低估的驱动因素。
根际和根鞘的物理特性,即根系附着土壤,对植物的生长性能至关重要。然而,根际结构特性的驱动因素及其与根鞘发育的关系尚不清楚。我们使用x射线计算机微断层扫描(1)探索了根际孔隙度的两个驱动因素:根诱导的变化与根优先生长到具有一定孔隙特征的土壤中;(2)估计它们对根际大孔隙度梯度和根鞘形成的贡献。¹⁴C标记后,评估根鞘发育与根际大孔隙度和根沉积的关系。我们的研究结果证实,根诱导的变化和生长偏好都影响根际结构,其相对重要性取决于固有的大孔有效性。在完整土壤中,生长偏好是主要因素,而在过筛土壤中,根系诱导的变化也同样重要。根鞘的形成与根压实周围环境和释放碳有关。然而,根鞘的形成与实际根际(即根系附近土壤的体积)之间没有相关性。该研究提供了对根际孔隙度梯度的新过程水平的理解,同时强调在解释从筛选土壤研究中获得的根生长数据时要谨慎。同样,传统的破坏性根鞘取样可能不能完全捕捉到实际根际的真实特征,强调了完整土壤分析的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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