Gene Details:

• MSU gene ID: LOC_Os02g25230
• RAPdb gene ID: Os02g0450000
• Gene Symbol: TAC4 SG2 OsBC17
• Genome: MSU7 ,  IRGSP-1.0
• Species: Oryza sativa

Functional Descriptions:

• TAC4 can regulate rice shoot gravitropism by increasing the indole acetic acid content and affecting the auxin distribution.
• TAC4 controls tiller angle by regulating the endogenous auxin content and distribution in rice.
• The loss of TAC4 function leads to a significant increase in the tiller angle.
• A sequence analysis revealed that TAC4 has undergone a bottleneck and become fixed in indica cultivars during domestication and improvement.
• TAC4 encodes a plant-specific, highly conserved nuclear protein.
• We further found that BRs enhance the accumulation of SG2 in the nucleus, and subcellular distribution of SG2 is regulated by GSK2 kinase activity.
• The decreased grain size was caused by repressed cell expansion in spikelet hulls of the SG2 mutant.
• In addition, OsOFP19, a negative regulator of grain shape, interacts with SG2 and plays an antagonistic role with SG2 in controlling gene expression and grain size.
• Our results indicated that SG2 is a new component of GSK2-related BR signaling response and regulates grain size by interacting with OsOFP19.
• SG2 is a positive regulator downstream of GSK2 in response to BR signaling, and its mutation causes insensitivity to exogenous BR treatment.
• According to LC-MS/MS analysis of intermediate products of the lignin synthesis pathway, the accumulation of caffeyl alcohol in the OsBC17 mutant was significantly higher than in Pingtangheinuo.
• Caffeyl alcohol can be polymerized to the catechyl lignin monomer by laccase ChLAC8; however, ChLAC8 and OsBC17 are not homologous proteins, which suggests that the OsBC17 gene is involved in this process by regulating laccase expression.

Function-related keywords:

• shoot-gravitropism ,  shoot ,  auxin ,  tiller ,  domestication ,  R-protein ,  tiller-angle ,  Kinase ,  spikelet ,  grain ,  grain-size ,  BR ,  BR-signaling ,  kinase ,  grain-shape ,  cell-expansion ,  lignin

Literature:

• TAC4 controls tiller angle by regulating the endogenous auxin content and distribution in rice .  DOI:  10.1111/pbi.13440 ;  PMID:  32628357
• Ribonuclease H-like gene SMALL GRAIN2 regulates grain size in rice through brassinosteroid signaling pathway .  DOI:  10.1111/jipb.13333 ;  PMID:  35904032
• BRITTLE CULM17, a Novel Allele of TAC4, Affects the Mechanical Properties of Rice Plants .  DOI:  10.3390/ijms23105305 ;  PMID:  35628116

Related News:

Gene Resources:

• NCBI ID:
• UniProt accessions:

Sequences: