Signaling by the EPFL-ERECTA family coordinates female germline specification through the BZR1 family in Arabidopsis
| Autor: | Hanyang Cai, Youmei Huang, Liping Liu, Man Zhang, Mengnan Chai, Xinpeng Xi, Mohammad Aslam, Lulu Wang, Suzhuo Ma, Han Su, Kaichuang Liu, Yaru Tian, Wenhui Zhu, Jingang Qi, Thomas Dresselhaus, Yuan Qin |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | The Plant Cell. 35:1455-1473 |
| ISSN: | 1532-298X 1040-4651 |
| DOI: | 10.1093/plcell/koad032 |
| Popis: | In most flowering plants, the female germline is initiated in the subepidermal L2 layer of ovule primordia forming a single megaspore mother cell (MMC). How signaling from the L1 (epidermal) layer could contribute to the gene regulatory network (GRN) restricting MMC formation to a single cell is unclear. We show that EPIDERMAL PATTERNING FACTOR-like (EPFL) peptide ligands are expressed in the L1 layer, together with their ERECTA family (ERf) receptor kinases, to control female germline specification in Arabidopsis thaliana. EPFL-ERf dependent signaling restricts multiple subepidermal cells from acquiring MMC-like cell identity by activating the expression of the major brassinosteroid (BR) receptor kinase BRASSINOSTEROID INSENSITIVE 1 and the BR-responsive transcription factor BRASSINOZOLE RESISTANT 1 (BZR1). Additionally, BZR1 coordinates female germline specification by directly activating the expression of a nucleolar GTP-binding protein, NUCLEOSTEMIN-LIKE 1 (NSN1), which is expressed in early-stage ovules excluding the MMC. Mutants defective in this GRN form multiple MMCs resulting in a strong reduction of seed set. In conclusion, we uncovered a ligand/receptor-like kinase-mediated signaling pathway acting upstream and coordinating BR signaling via NSN1 to restrict MMC differentiation to a single subepidermal cell. |
| Databáze: | OpenAIRE |
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