Section of Plant Biology, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853.
Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853.
Proc Natl Acad Sci U S A. 2022 Apr 5;119(14):e2116860119. doi: 10.1073/pnas.2116860119. Epub 2022 Mar 28.
SignificancePlants grow from their tips. The gametophore (shoot-like organ) tip of the moss is a single cell that performs the same functions as those of multicellular flowering plants, producing the cells that make leaves and regenerating new stem cells to maintain the shoot tip. Several pathways, including CLAVATA and cytokinin hormonal signaling, regulate stem cell abundance in flowering plants and in mosses, although the mechanisms whereby these pathways regulate stem cell abundance and their conservation between these plant lineages is poorly understood. Using moss, we investigated how CLAVATA and cytokinin signaling interact. Overall, we found evidence that CLAVATA and cytokinin signaling interact similarly in moss and flowering plants, despite their distinct anatomies, life cycles, and evolutionary distance.
意义植物从其顶端生长。苔藓的配子体（类似茎的器官）顶端是一个单细胞，它执行与多细胞有花植物相同的功能，产生制造叶子的细胞，并再生新的茎干细胞来维持茎顶端。包括 CLAVATA 和细胞分裂素激素信号在内的几个途径调节有花植物和苔藓中的干细胞丰度，尽管这些途径调节干细胞丰度的机制及其在这些植物谱系之间的保守性尚不清楚。我们使用苔藓来研究 CLAVATA 和细胞分裂素信号如何相互作用。总的来说，我们发现尽管苔藓和有花植物在解剖结构、生命周期和进化距离上存在明显差异，但它们的 CLAVATA 和细胞分裂素信号相互作用方式相似。
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