A closer look at root water potential: experimental evidence based on drought stress of Chrysopogon zizanioides
A closer look at root water potential: experimental evidence based on drought stress of Chrysopogon zizanioides
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DOI：
10.1007/s11104-024-06481-5
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发表时间：
2024-01-17
期刊：
影响因子：
4.9
通讯作者：
Leung，Anthony Kwan
中科院分区：
文献类型：
--
作者：
Ganesan，Suriya Prakash;Boldrin，David;Leung，Anthony Kwan
土壤-植物-大气连续体中的水分运动是由土壤-植物系统水势的调节因子驱动的。在这里，我们演示了如何根水势直接从根测量土壤水势的变化后，将有助于理解的干旱反应在Chrysopogon zizanoides.MethodsPlants of Chrysopogon zizanoides L.取样在不同的土壤水分状况（诱导干旱）和生长期（3-，4-和5-个月）。解剖植物的根和叶，分别测量根水势和比叶面积。用WP 4C型露点电位计测定根水势。根直径对应的根测量根水势也measured.ResultsOur研究结果表明，在诱导干旱胁迫下，土壤和根水势之间的梯度呈对数增加，类似于现有的研究结果的根水力传导。比叶面积随根水势的增大而显著减小，表明根叶间的水力连续性。一个新的幂律根直径和根水势之间的相关性建立了一个基于特征的理解根wateruptake.ConclusionThe聚集这样的根水势测量电位器将提供策略，探索地下植物行为的影响，如边坡稳定性和灌溉的应用。
AimsGradients in water potential of soil and plant system drives the water movement in soil-plant-atmospheric continuum. Here, we demonstrate how root water potential measured directly from the roots upon changes in soil water potential would contribute to the understanding of the drought response inChrysopogon zizanoides.MethodsPlants ofChrysopogon zizanoides L.were sampled at different soil water status (inducing drought) and growth periods (3-, 4- and 5- months). The roots and leaves of the plants were dissected to measure the root water potential and specific leaf area, respectively. The root water potential was measured in a WP4C dew-point potentiometer. Root diameter corresponding to the roots measured for root water potential was also measured.ResultsOur findings showed a logarithmic increase in gradient between soil and root water potential under the induced drought stress, similar to the existing findings of root hydraulic conductance. Specific leaf area significantly decreased with root water potential, indicating the hydraulic continuity between roots and leaves. A new power law correlation between root diameter and root water potential established a trait-based understanding of root water uptake.ConclusionThe aggregation of such root water potential measurements using potentiometer would offer strategies to explore the implications of below-ground plant behaviour in applications such as slope stability and irrigation.