Gene Details:

• MSU gene ID: LOC_Os01g17260
• RAPdb gene ID: Os01g0279900
• Gene Symbol: OsHBP1b OsTGA5
• Genome: MSU7 ,  IRGSP-1.0
• Species: Oryza sativa

Functional Descriptions:

• As compared to the WT tobacco plants, the transgenic plants ectopically expressing OsHBP1b showed better survival and favourable osmotic parameters (such as germination and survival rate, membrane stability, K(+)/Na(+) ratio, lipid peroxidation, electrolyte leakage and proline contents) under salinity and drought stress.
• qRT-PCR based expression studies for OsHBP1b in seedlings of contrasting genotypes of rice showed its differential regulation in response to salinity stress.
• Taken together, our findings suggest that OsHBP1b contributes to abiotic stress tolerance through multiple physiological pathways and thus, may serve as a useful ‘candidate gene’ for improving multiple stress tolerance in crop plants.
• In the present study, we over-express the full-length gene encoding OsHBP1b in the homologous system (rice) to assess its contribution towards multiple stress tolerance and grain yield.
• Recently, we have reported the characterization of OsHBP1b in relation to salinity and drought tolerance in a model system tobacco.
• We provide evidence to show that transgenic rice plants over-expressing OsHBP1b exhibit better survival and favourable osmotic parameters under salinity stress than the wild type counterparts.
• Phosphorylation of OsTGA5 by casein kinase II compromises its suppression of defense-related gene transcription in rice.
• Importantly, we showed that the nucleus-localized casein kinase II (CK2) complex interacts with and phosphorylates OsTGA5 on Ser-32, which reduces the affinity of OsTGA5 for the JIOsPR10 promoter, thereby alleviating the repression of JIOsPR10 transcription and increasing rice resistance.
• In this study, we characterized the role of OsTGA5 as a negative regulator of rice resistance against blast fungus by transcriptionally repressing the expression of various defense-related genes.
• Moreover, OsTGA5 repressed PTI responses and the accumulation of endogenous salicylic acid.
• Furthermore, the in vivo phosphorylation of OsTGA5 Ser-32 was enhanced by blast fungus infection.
• Taken together, our results provide a mechanism for the role of OsTGA5 in negatively regulating the transcription of defense-related genes in rice and the repressive switch imposed by nuclear CK2-mediated phosphorylation during blast fungus invasion.

Function-related keywords:

• drought ,  salinity ,  tolerance ,  stress ,  seedlings ,  grain ,  grain-yield ,  yield ,  drought-tolerance ,  salinity-stress ,  stress-tolerance ,  Kinase ,  kinase ,  resistance ,  salicylic-acid ,  blast

Literature:

• A nuclear-localized histone-gene binding protein from rice (OsHBP1b) functions in salinity and drought stress tolerance by maintaining chlorophyll content and improving the antioxidant machinery .  DOI:  10.1016/j.jplph.2014.11.005 ;  PMID:  25543954
• A unique bZIP transcription factor imparting multiple stress tolerance in Rice .  DOI:  10.1186/s12284-019-0316-8 ;  PMID:  31375941
• Phosphorylation of OsTGA5 by casein kinase II compromises its suppression of defense-related gene transcription in rice .  DOI:  10.1093/plcell/koac164 ;  PMID:  35642941

Related News:

Gene Resources:

• NCBI ID: KM096571
• UniProt accessions:

Sequences: