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The SEEL motif and members of the MYB-related REVEILLE transcription factor family are important for the expression of LORELEI in the synergid cells of the Arabidopsis female gametophyte

Journal Article · · Plant Reproduction
 [1];  [2];  [3];  [4];  [4];  [2];  [4]
  1. Univ. of Arizona, Tucson, AZ (United States); University of Arizona School of Plant Science
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Agendia, Inc., Irvine, CA (United States)
  4. Univ. of Arizona, Tucson, AZ (United States)
Synergid cells in the micropylar end of the female gametophyte are required for critical cell–cell signaling interactions between the pollen tube and the ovule that precede double fertilization and seed formation in flowering plants. LORELEI (LRE) encodes a putative GPI-anchored protein that is expressed primarily in the synergid cells, and together with FERONIA, a receptor-like kinase, it controls pollen tube reception by the receptive synergid cell. Still, how LRE expression is controlled in synergid cells remains poorly characterized. We identified candidate cis-regulatory elements enriched in LRE and other synergid cell-expressed genes. One of the candidate motifs (‘TAATATCT’) in the LRE promoter was an uncharacterized variant of the Evening Element motif that we named as the Short Evening Element-like (SEEL) motif. Deletion or point mutations in the SEEL motif of the LRE promoter resulted in decreased reporter expression in synergid cells, demonstrating that the SEEL motif is important for expression of LRE in synergid cells. Additionally, we found that LRE expression is decreased in the loss of function mutants of REVEILLE (RVE) transcription factors, which are clock genes known to bind the SEEL and other closely related motifs. Here, we propose that RVE transcription factors regulate LRE expression in synergid cells by binding to the SEEL motif in the LRE promoter. Identification of cis-regulatory elements and transcription factors involved in the expression of LRE will serve as a foundation to characterize the gene regulatory networks in synergid cells.
Research Organization:
Great Lakes Bioenergy Research Center, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0018409
OSTI ID:
1845902
Journal Information:
Plant Reproduction, Journal Name: Plant Reproduction Journal Issue: 1 Vol. 35; ISSN 2194-7953
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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