Intracellular trafficking of photoreceptors during light-induced signal transduction in plants.
Intracellular trafficking of photoreceptors during light-induced signal transduction in plants.
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发表时间：
2001-02
影响因子：
4
通讯作者：
F. Nagy;S. Kircher;E. Schäfer
中科院分区：
文献类型：
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作者：
F. Nagy;S. Kircher;E. Schäfer
植物通过高度专门化的光感受器来监测环境光环境的变化，这些光感受器包括红/远红光可逆的光敏色素、吸收蓝光的隐色素和趋光素以及迄今尚未发现的UVB光感受器(S)。光很容易穿透植物的器官/组织，甚至到达各种细胞类型的亚细胞室。因此，多年来，光感受器细胞内定位的确定一直是植物光生物学和细胞生物学研究的一个主要且往往有争议的主题，这并不令人惊讶。向光素是高等植物的蓝光感受器之一，它通过监测光的方向来控制向光性，它定位于质膜上或质膜上。相比之下，光敏色素的亚细胞定位是动态变化的，并呈现出非常复杂的模式。这些光感受器定位于黑暗生长组织的胞浆中。然而，辐射会诱导光敏色素进入细胞核。这种进口以依赖于光质和光量的方式发生，因此，似乎是高等植物所独有的。光诱导的光敏色素在细胞核中的积累与这些光感受器介导的各种生理反应有很好的相关性。这些观察结果表明，光依赖的光敏色素感受器在细胞内的重新分布是光形态发生的主要调控步骤之一。
Plants monitor changes in the ambient light environment by highly specialised photoreceptors, which include the red/far-red photoreversible phytochromes, the blue-light-absorbing cryptochromes and phototropin and the so-far-unidentified UVB photoreceptor(s). Light easily penetrates plant organs/tissues and reaches even the subcellular compartments of various cell types. Therefore, it is not surprising that the determination of the intracellular localisation of photoreceptors has been, for many years, a major, and often controversial, subject of plant photobiology and cell biology research. Phototropin, one of the blue-light photoreceptors of higher plants, controls phototropism by monitoring the direction of light, and it is localised in or at the plasmalemma. In contrast, the subcellular localisation of phytochromes changes dynamically and exhibits a very complex pattern. These photoreceptors are localised in the cytosol in dark- grown tissues. Irradiation, however, induces import of phytochromes into the nucleus. The import occurs in a light-quality- and light-quantity-dependent fashion and, as such, seems to be unique to higher plants. Light-induced accumulation of phytochromes in the nuclei correlates well with various physiological responses mediated by these photoreceptors. These observations indicate that light-dependent intracellular redistribution of phytochrome photoreceptors is one of the major regulatory steps in photomorphogenesis.