The root is the sensing organ for potassium (K) and water availability. We evaluated whether K availability influences root architecture and contributes to drought tolerance under moisture stress. Rice seedling growth was severely affected by low K availability under water stress, and the substantial reductions in root projected area, maximum width, and width to depth ratio were observed. High K availability helps maintain root top and bottom angles and reduces root steepness under mild water stress, but over K nutrition does not ensure higher seedling growth. Under severe water stress, the steepness was more regulated by water than K availability.

中文翻译：

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水分胁迫下植物的根系结构对钾营养有反应吗？一例来自稻苗根系反应。

根是钾（K）和水可用性的传感器官。我们评估了钾的有效性是否会影响根系结构并促进水分胁迫下的耐旱性。水分胁迫下低钾有效性严重影响了水稻幼苗的生长，并且观察到根部投影面积，最大宽度和宽度与深度的比值显着降低。在温和的水分胁迫下，高钾素的利用有助于维持根​​的顶部和底部角度并降低根部的陡度，但是钾素的过量营养无法确保更高的幼苗生长。在严重的水分胁迫下，陡度比钾的有效性更受水分调节。