- Information
- Symbol: SMOS1,SHB,RLA1,NGR5
- MSU: LOC_Os05g32270
- RAPdb: Os05g0389000
- Publication
- A novel AP2-type transcription factor, SMALL ORGAN SIZE1, controls organ size downstream of an auxin signaling pathway, 2014, Plant Cell Physiol.
- SHOEBOX Modulates Root Meristem Size in Rice through Dose-Dependent Effects of Gibberellins on Cell Elongation and Proliferation., 2015, PLoS Genet.
- The RLA1/SMOS1 Transcription Factor Functions with OsBZR1 to Regulate Brassinosteroid Signaling and Rice Architecture., 2017, Plant Cell.
- Enhanced sustainable green revolution yield via nitrogen-responsive chromatin modulation in rice., 2020, Science.
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Genbank accession number
- Key message
- SMOS1 expression was induced by exogenous auxin treatment, and the auxin response element (AuxRE) of the SMOS1 promoter acts as a cis-motif through interaction with auxin response factor (ARF)
- We propose that SMOS1 acts as an auxin-dependent regulator for cell expansion during organ size control, and that its function is conserved among land plants
- In this study, we identified a new rice loss-of-function mutant, small organ size1 (smos1), that decreases the final size of various organs due to decreased cell size and abnormal microtubule orientation
- Furthermore, a functional fluorophore-tagged SMOS1 was localized to the nucleus, supporting the role of SMOS1 as a transcriptional regulator for organ size control
- SMOS1 encodes an unusual APETALA2 (AP2)-type transcription factor with an imperfect AP2 domain, and its product belongs to the basal AINTEGUMENTA (ANT) lineage, including WRINKLED1 (WRI1) and ADAP
- Quantitative analysis of cortical cell length and number indicates that shb has shorter, rather than fewer, cells in the root meristem until around the fifth day after sowing, from which the number of cortical cells is also reduced
- SHB encodes an AP2/ERF transcription factor that directly activates transcription of the GA biosynthesis gene KS1
- These defects can be either corrected by exogenous application of bioactive GA or induced in wild-type roots by a dose-dependent inhibitory effect of paclobutrazol on GA biosynthesis, suggesting that GA deficiency is the primary cause of shb mutant phenotypes
- Thus, root meristem size in rice is modulated by SHB-mediated GA biosynthesis that regulates the elongation and proliferation of meristem cells in a developmental stage-specific manner.
- SHOEBOX Modulates Root Meristem Size in Rice through Dose-Dependent Effects of Gibberellins on Cell Elongation and Proliferation
- RLA1 was identical to the previously reported SMALL ORGAN SIZE 1 (SMOS1) which was cloned from another allele
- Increased NGR5 activity consequently uncouples tillering from nitrogen regulation, boosting rice yield at low nitrogen fertilization levels
- NGR5 thus enables enhanced nitrogen use efficiency for improved future agricultural sustainability and food security
- We found that genome-wide promotion of histone H3 lysine 27 trimethylation (H3K27me3) enables nitrogen-induced stimulation of rice tillering: APETALA2-domain transcription factor NGR5 (NITROGEN-MEDIATED TILLER GROWTH RESPONSE 5) facilitates nitrogen-dependent recruitment of polycomb repressive complex 2 to repress branching-inhibitory genes via H3K27me3 modification
- NGR5 is a target of gibberellin receptor GIBBERELLIN INSENSITIVE DWARF1 (GID1)-promoted proteasomal destruction
- Connection
- OsPHI-1, SMOS1~SHB~RLA1~NGR5, A novel AP2-type transcription factor, SMALL ORGAN SIZE1, controls organ size downstream of an auxin signaling pathway, Among the down-regulated genes, we demonstrated by gel-shift and chromatin immunoprecipitation (ChIP) experiments that OsPHI-1, which is involved in cell expansion, is a target of SMOS1
- OsPHI-1, SMOS1~SHB~RLA1~NGR5, Small Organ Size 1 and Small Organ Size 2/Dwarf and Low Tillering form a Complex to Integrate Auxin and Brassinosteroid Signaling in Rice., Consistently, the expression of OsPHI-1, a direct target of SMOS1, is up-regulated only when SMOS1 and SMOS2/DLT proteins were both present in rice cells
- NAC028, SMOS1~SHB~RLA1~NGR5, Red-light receptor phytochrome B inhibits BZR1-NAC028-CAD8B signaling to negatively regulate rice resistance to sheath blight., It was also found that the BZR1 ligand NAC028 positively regulated resistance to ShB
- PHYB~OsphyB, SMOS1~SHB~RLA1~NGR5, Red-light receptor phytochrome B inhibits BZR1-NAC028-CAD8B signaling to negatively regulate rice resistance to sheath blight., Here, we found that PhyB mutation or shade treatment promoted rice resistance to ShB, while resistance was reduced by PhyB overexpression
- PHYB~OsphyB, SMOS1~SHB~RLA1~NGR5, Red-light receptor phytochrome B inhibits BZR1-NAC028-CAD8B signaling to negatively regulate rice resistance to sheath blight., Plants overexpressing PIL15 were more susceptible to ShB in contrast to bzr1-D-overexpressing plants compared with the wild-type, suggesting that PhyB may inhibit BZR1 to negatively regulate rice resistance to ShB
- OsBZR1~BZR1, SMOS1~SHB~RLA1~NGR5, Red-light receptor phytochrome B inhibits BZR1-NAC028-CAD8B signaling to negatively regulate rice resistance to sheath blight., Plants overexpressing PIL15 were more susceptible to ShB in contrast to bzr1-D-overexpressing plants compared with the wild-type, suggesting that PhyB may inhibit BZR1 to negatively regulate rice resistance to ShB
- OsBZR1~BZR1, SMOS1~SHB~RLA1~NGR5, Red-light receptor phytochrome B inhibits BZR1-NAC028-CAD8B signaling to negatively regulate rice resistance to sheath blight., Although BZR1 is known to regulate brassinosteroid (BR) signalling, the observation that BR signalling negatively regulated resistance to ShB indicated an independent role for BZR1 in controlling rice resistance
- OsBZR1~BZR1, SMOS1~SHB~RLA1~NGR5, Red-light receptor phytochrome B inhibits BZR1-NAC028-CAD8B signaling to negatively regulate rice resistance to sheath blight., It was also found that the BZR1 ligand NAC028 positively regulated resistance to ShB
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