Electrical signals and cytokinins regulate the absorption of ions by maize and barley roots

The absorption of ions in the root is the most important step to maintain the nutritional balance of plant cells. The absorption of nutrients in the mature area is controlled by the system of stems and root tips. This process is regulated by electrical signals, pressure, mechanical stimulation, light and cytokinin. In 2009, scientists studied the ion currents in the roots of corn and barley through non-damaging micro-measurement technology, and found that short-term light reduced H + outflow, and K + changed from absorption to outflow. Under the low salt environment, the roots of the cut corn and barley reduced H + outflow and K + inflow stopped. When 100 mM NaCl is added, the pressure changes drastically, but the ion flow is not affected. The root tip of barley was cut away, and the ion current changed from a small inflow to a large inflow. Kinetin (2-4 μM, a cytokinin) caused a greater influx of K +, indicating that the transport of ions is regulated by the cytokinin synthesized by the root tip. This study shows that rapid electrical signals and cytokinins can regulate the nutrient absorption of roots. The next step of research will focus on how electrical signals triggered by increasing light intensity can regulate plant ion transport and nutrition absorption. This work provides a basis for how we regulate the nutrient absorption of plants. Keywords: kinetin; long-distance signalling; K +; H + References: Shabala S, et al. Plant, Cell and Environment (2009) 32, 194–207

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