研究人员在单细胞分辨率下绘制了番茄芽生根发育图，发现这些根通过独特的过渡状态从韧皮部相关细胞开始发育。 这种状态需要一种转录因子的激活，研究人员将其命名为SBRL（SHOOTBORNE ROOTLESS）。进化分析表明，SBRL的功能和顺式调控在被子植物中是保守的，它是作为一个古老的复制出现的，其同系物控制着伤口诱导的和侧根的启动。研究人员提出，一个共同的过渡状态被特定环境的调节因子激活是植物根系的可塑性的基础。
据悉，植物在不同的发育环境中不断地形成新的器官，以响应环境变化。地下侧根起源于主根中预先形成的细胞，但细胞也可以绕过根-茎的轨迹分离，通过未知的机制生成芽生根。
附：英文原文
Title: A conserved superlocus regulates above- and belowground root initiation
Author: Moutasem Omary, Naama Gil-Yarom, Chen Yahav, Evyatar Steiner, Anat Hendelman, Idan Efroni
Issue&Volume: 2022-03-04
Abstract: Plants continuously form new organs in different developmental contexts in response to environmental cues. Underground lateral roots initiate from prepatterned cells in the main root, but cells can also bypass the root-shoot trajectory separation and generate shoot-borne roots through an unknown mechanism. We mapped tomato (Solanum lycopersicum) shoot-borne root development at single-cell resolution and showed that these roots initiate from phloem-associated cells through a unique transition state. This state requires the activity of a transcription factor that we named SHOOTBORNE ROOTLESS (SBRL). Evolutionary analysis reveals that SBRL’s function and cis regulation are conserved in angiosperms and that it arose as an ancient duplication, with paralogs controlling wound-induced and lateral root initiation. We propose that the activation of a common transition state by context-specific regulators underlies the plasticity of plant root systems.
DOI: abf4368
Source: https://www.science.org/doi/10.1126/science.abf4368