4.7 Article

Regulation of plant vascular stem cells by endodermis-derived EPFL-family peptide hormones and phloem-expressed ERECTA-family receptor kinases

期刊

JOURNAL OF EXPERIMENTAL BOTANY
卷 64, 期 17, 页码 5335-5343

出版社

OXFORD UNIV PRESS
DOI: 10.1093/jxb/ert196

关键词

Endodermis; EPFL-family peptide hormone; ERECTA-family receptor kinase; ligand; phloem; procambium; vasculature

资金

  1. MEXT/JSPS KAKENHI [24570050, 24113513, 25114511, 19060007, 22370019]
  2. Grants-in-Aid for Scientific Research [24113513, 22370019, 25114511, 24570050] Funding Source: KAKEN

向作者/读者索取更多资源

Plant vasculatures are complex tissues consisting of (pro)cambium, phloem, and xylem. The (pro) cambium serves as vascular stem cells that produce all vascular cells. The Arabidopsis ERECTA (ER) receptor kinase is known to regulate the architecture of inflorescence stems. It was recently reported that the er mutation enhances a vascular phenotype induced by a mutation of TDR/PXY, which plays a significant role in procambial proliferation, suggesting that ER participates in vascular development. However, detailed molecular mechanisms of the ER-dependent vascular regulation are largely unknown. Here, this work found that ER and its paralogue, ER-LIKE1, were redundantly involved in procambial development of inflorescence stems. Interestingly, their activity in the phloem was sufficient for vascular regulation. Furthermore, two endodermis-derived peptide hormones, EPFL4 and EPFL6, were redundantly involved in such regulation. It has been previously reported that EPFL4 and EPFL6 act as ligands of phloem-expressed ER for stem elongation. Therefore, these findings indicate that cell-cell communication between the endodermis and the phloem plays an important role in procambial development as well as stem elongation. Interestingly, similar EPFL-ER modules control two distinct developmental events by slightly changing their components: the EPFL4/6-ER module for stem elongation and the EPFL4/6-ER/ERL1 module for vascular development.

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