The development of lateral roots in Arabidopsis thaliana is strongly dependent on signaling directed by the AUXIN RESPONSE FACTOR7 (ARF7), which in turn activates LATERAL ORGAN BOUNDARIES DOMAIN (LBD) transcription factors (LBD16, LBD18 and LBD29). Here, the product of PRH1, a PR-1 homolog annotated previously as encoding a pathogen-responsive protein, was identified as a target of ARF7-mediated auxin signaling and also as participating in the development of lateral roots. PRH1 was shown to be strongly induced by auxin treatment, and plants lacking a functional copy of PRH1 formed fewer lateral roots. The transcription of PRH1 was controlled by the binding of both ARF7 and LBDs to its promoter region.

中文翻译：

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PRH1 介导 ARF7-LBD 依赖性生长素信号传导以调节拟南芥的侧根发育。

拟南芥侧根的发育强烈依赖于由 AUXIN RESPONSE FACTOR7 (ARF7) 指导的信号传导，这反过来又激活 LATERAL ORGAN BOUNDARIES DOMAIN (LBD) 转录因子 (LBD16、LBD18 和 LBD29)。在这里，PRH1 的产物是一种 PR-1 同源物，之前被注释为编码病原体反应蛋白，被鉴定为 ARF7 介导的生长素信号传导的靶标，也参与了侧根的发育。PRH1 被生长素处理强烈诱导，缺乏 PRH1 功能拷贝的植物形成较少的侧根。PRH1 的转录受 ARF7 和 LBD 与其启动子区域的结合控制。