Abstract:
:The juvenile-to-adult transition in plants involves changes in vegetative growth and plant architecture; the timing of this transition has important implications for agriculture. The microRNA miR156 regulates this transition and shoot maturation in plants. In Arabidopsis thaliana, deposition of histone H3 trimethylation on lysine 27 (H3K27me3, a repressive mark) at the MIR156A/C loci is regulated by Polycomb Repressive Complex 1 (PRC1) or PRC2, depending on the developmental stage. The levels of miR156 progressively decline during shoot maturation. The amount of H3K27me3 at MIR156A/C loci affects miR156 levels; however, whether this epigenetic regulation is conserved remains unclear. Here, we found that in rice (Oryza sativa), the putative PRC1 subunit LIKE HETEROCHROMATIN PROTEIN 1 (OsLHP1), with the miR156-SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) module, affects developmental phase transitions. Loss of OsLHP1 function results in ectopic expression of MIR156B/C/I/E, phenocopy of miR156 overexpression, and reduced H3k27me3 levels at MIR156B/C/I/E. This indicates that OsLHP1 has functionally diverged from Arabidopsis LHP1. Genetic and transcriptome analyses of wild-type, miR156b/c-overexpression, and Oslhp1-2 mutant plants suggest that OsLHP1 acts upstream of miR156 and SPL during the juvenile-to-adult transition. Therefore, modifying the OsLHP1-miR156-SPL pathway may enable alteration of the vegetative period and plant architecture.
journal_name
J Integr Plant Bioljournal_title
Journal of integrative plant biologyauthors
Cui Y,Cheng J,Ruan S,Qi P,Liu W,Bian H,Ye L,Zhang Y,Hu J,Dong G,Guo L,Zhang Y,Qian Q,Hu Xdoi
10.1111/jipb.12991subject
Has Abstractpub_date
2020-12-01 00:00:00pages
1839-1852issue
12eissn
1672-9072issn
1744-7909journal_volume
62pub_type
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