Bakshi Arkadipta, Swanson Sarah J, Gilroy Simon
University of Wisconsin-Madison, Department of Botany, Birge Hall, 430 Lincoln Drive, 53706, Madison, WI, United States of America.
University of Wisconsin-Madison, Department of Botany, Birge Hall, 430 Lincoln Drive, 53706, Madison, WI, United States of America.
Cell Calcium. 2023 Mar;110:102695. doi: 10.1016/j.ceca.2023.102695. Epub 2023 Jan 14.
Mimosa pudica, the sensitive plant, responds to stimuli such as touch and wounding with leaf movements that propagate throughout the plant. The motion is driven by changes in the turgor of specialized cells in a set of motor organs called pulvinae. By imaging cellular Ca levels as the wave of movement propagates through the leaf, Hagihara and colleagues now show that Ca signals precede and predict the pulvinar movements. These results provide compelling support for a model where Mimosa uses a Ca-related response system to trigger its leaf movements. These researchers then used CRISPR to delete a critical genetic regulator of pulvinar development, producing plants with immobile leaves. These plants experienced more herbivory than wild type, suggesting that the Ca-triggered leaf movements are an adaptation to deter herbivory.
含羞草，这种敏感植物，会对诸如触摸和受伤等刺激做出反应，通过叶片运动在整个植株中传播。这种运动是由一组称为叶枕的运动器官中特化细胞的膨压变化驱动的。通过在叶片运动波在叶片中传播时对细胞钙水平进行成像，萩原及其同事现在表明钙信号先于并预测叶枕运动。这些结果为一个模型提供了有力支持，即含羞草利用与钙相关的反应系统来触发其叶片运动。然后，这些研究人员使用CRISPR删除了叶枕发育的一个关键基因调控因子，培育出了叶片无法运动的植株。这些植株比野生型遭受了更多的食草动物侵害，这表明由钙触发的叶片运动是一种抵御食草动物的适应性机制。
