Plants dynamically adjust their architecture to optimize growth and performance under fluctuating light environments, a process termed photomorphogenesis. A variety of photomorphogenic responses have been studied extensively in the shoots, where diverse photoreceptors and signaling molecules have been functionally characterized. Notably, accumulating evidence demonstrates that the underground roots also undergo photomorphogenesis, raising the question of how roots perceive and respond to aboveground light. Recent findings indicate that root photomorphogenesis is mediated by multiple signaling routes, including shoot-to-root transmission of mobile signaling molecules, direct sensing of light by the roots, and light channeling through the plant body. In this review we discuss recent advances in how light signals are transmitted to the roots to trigger photomorphogenic responses.

植物动态地调整其架构，以在变化的光照环境下优化生长和性能，这一过程称为光形态发生。在芽中已广泛研究了多种光形态发生反应，其中已对各种光感受器和信号分子进行了功能表征。值得注意的是，越来越多的证据表明地下根也经历了光形态发生，这引发了一个问题，即根如何感知并响应地上光。最近的发现表明，根的光形态发生是通过多种信号传导途径介导的，包括移动信号分子的从茎到根的传播，根部对光的直接感应以及光通过植物体的传播。