State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China.
Institute of Fruit and Tea, Hubei Academy of Agricultural Sciences, Wuhan, China.
PLoS One. 2014 Jan 21;9(1):e85720. doi: 10.1371/journal.pone.0085720. eCollection 2014.
Plants can be adapted to the changing environments through tropic responses, such as light and gravity. One of them is root negative phototropism, which is needed for root growth and nutrient absorption. Here, we show that the auxin efflux carrier PIN-FORMED (PIN) 1 is involved in asymmetric auxin distribution and root negative phototropism. In darkness, PIN1 is internalized and localized to intracellular compartments; upon blue light illumination, PIN1 relocalize to basal plasma membrane in root stele cells. The shift of PIN1 localization induced by blue light is involved in asymmetric auxin distribution and root negative phototropic response. Both blue-light-induced PIN1 redistribution and root negative phototropism is mediated by a BFA-sensitive trafficking pathway and the activity of PID/PP2A. Our results demonstrate that blue-light-induced PIN1 redistribution participate in asymmetric auxin distribution and root negative phototropism.
植物可以通过向性反应（如光和重力）来适应不断变化的环境。其中之一是根负向向光性，这是根生长和养分吸收所必需的。在这里，我们表明生长素外排载体 PIN 形成（PIN）1 参与了不对称生长素分布和根负向向光性。在黑暗中，PIN1 被内化并定位于细胞内隔室；蓝光照射后，PIN1 在根中柱细胞的基底面质膜重新定位。蓝光诱导的 PIN1 定位改变参与了不对称生长素分布和根负向向光性反应。蓝光诱导的 PIN1 重分布和根负向向光性都由 BFA 敏感的运输途径和 PID/PP2A 的活性介导。我们的结果表明，蓝光诱导的 PIN1 重分布参与了不对称生长素分布和根负向向光性。
