Cell-by-cell dissection of phloem development links a maturation gradient to cell specialization.
Cell-by-cell dissection of phloem development links a maturation gradient to cell specialization.
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DOI:
10.1126/science.aba5531
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发表时间:
2021-12-24
期刊:
影响因子:
--
通讯作者:
Helariutta Y
中科院分区:
文献类型:
--
作者:
Roszak P;Heo JO;Blob B;Toyokura K;Sugiyama Y;de Luis Balaguer MA;Lau WWY;Hamey F;Cirrone J;Madej E;Bouatta AM;Wang X;Guichard M;Ursache R;Tavares H;Verstaen K;Wendrich J;Melnyk CW;Oda Y;Shasha D;Ahnert SE;Saeys Y;De Rybel B;Heidstra R;Scheres B;Grossmann G;Mähönen AP;Denninger P;Göttgens B;Sozzani R;Birnbaum KD;Helariutta Y
In the plant meristem, tissue-wide maturation gradients are coordinated with specialized cell networks to establish various developmental phases required for indeterminate growth. Here, we used single-cell transcriptomics to reconstruct the protophloem developmental trajectory from birth of cell progenitors to terminal differentiation in the Arabidopsis root. PHLOEM EARLY DNA-BINDING-WITH-ONE-FINGER (PEAR) transcription factors mediate lineage bifurcation by activating GTPase signaling and prime a transcriptional differentiation program. This program is initially repressed by a meristem-wide gradient of PLETHORA transcription factors. Only the dissipation of PLETHORA gradient permits activation of the differentiation program that involves mutual inhibition of early vs. late meristem regulators. Thus, for phloem development, broad maturation gradients interface with cell-type specific transcriptional regulators to stage cellular differentiation. Single-cell analysis shows how global signals in the root meristem interact with the cell type specific factors to determine distinct phases of phloem development.
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