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第一作者:Rotem Matosevich
第一单位:耶路撒冷希伯来大学
通讯作者:Idan Efroni
Abstract
背景回顾: The root meristem can regenerate following removal of its stem-cell niche by recruitment of remnant cells from the stump.
提出问题:Regeneration is initiated by rapid accumulation of auxin near the injury site but the source of this auxin is unknown.
主要发现:Here, we show that auxin accumulation arises from the activity of multiple auxin biosynthetic sources that are newly specified near the cut site and that their continuous activity is required for the regeneration process.
结果-Auxin_PIN:Auxin synthesis is highly localized while PIN-mediated transport is dispensable for auxin accumulation and tip regeneration.
结果-ERF115:Roots lacking the activity of the regeneration competence factor ERF115, or that are dissected at a zone of low regeneration potential, fail to activate local auxin sources. Remarkably, restoring auxin supply is sufficient to confer regeneration capacity to these recalcitrant tissues.
结论:We suggest that regeneration competence relies on the ability to specify new local auxin sources in a precise temporal pattern.
摘 要
植物根的分生组织能够在移除掉本身干细胞龛之后通过招募残留的细胞来再生。再生起始于受伤部位附近的快速生长素积累,但是生长素来源于哪并不清楚。本文中,作者发现生长素积累来自于多个生长素合成源的激活,这些生长素合成源均是在受伤部位附近新形成的,并且其持续的活性对于整个再生过程是必需的。生长素的合成是高度聚集的,因此由PIN介导的生长素转运对于生长素积累和尖端再生必不可少。缺少再生能力因子ERF115活性的根,或者在再生潜力很低的部位造成损伤,这种情况不能够激活局部的生长素源。有意思的是,恢复生长素的供应足以赋予这些顽抗组织以再生能力。作者提出再生能力依赖于以精确的时空模式特化出新的局部生长素源。
通讯作者
**Idan Efroni**
研究方向:
再生与不定根的发育。
doi: 10.1038/s41477-020-0737-9
Journal: Nature Plants
Published date: August 03, 2020
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