Gene Details:

• MSU gene ID: LOC_Os04g23550
• RAPdb gene ID: Os04g0301500
• Gene Symbol: RERJ1 OsOsbHLH006 OsbHLH6
• Genome: MSU7 ,  IRGSP-1.0
• Species: Oryza sativa

Functional Descriptions:

• Differential screening of a cDNA library constructed using poly(A)(+) RNA from suspension-cultured rice cells treated with jasmonic acid (JA) for 1/2h yielded a cDNA of a gene tentatively named RERJ1 that is upregulated in response to exogenous JA.
• Northern blot analysis indicated that the RERJ1 mRNA levels peaked at 1/2-1h after the addition of jasmonic acid and then decreased gradually.
• RERJ1, a jasmonic acid-responsive gene from rice, encodes a basic helix-loop-helix protein.
• We previously reported that RERJ1, a JA-inducible transcription factor in rice, is up-regulated by exposure to wounding and drought stress.
• RERJ1 expression was induced only at the region of injury after wounding, whereas expression was induced in the entire leaf after drought.
• According to JA measurements of stressed leaves, high accumulation of endogenous JA was only detected around the wound site in a rice leaves, whereas the drought treatment led to uniform accumulation of JA in the entire leaf, suggesting that RERJ1 will be a useful marker gene for studies on localization of JA in rice.
• Stress-induced expression of the transcription factor RERJ1 is tightly regulated in response to jasmonic acid accumulation in rice.
• The jasmonic acid (JA)-responsive gene RERJ1 isolated from suspension-cultured rice cells encodes a transcription factor with a basic helix-loop-helix motif.
• The phenotypes of transgenic rice plants overexpressing sense or antisense RERJ1 mRNA demonstrated that RERJ1 is involved in the growth inhibition of rice shoots caused by JA.
• It is also suggested that JA but not abscisic acid is involved in the up-regulation of RERJ1 expression caused by wounding and drought stress.
• These results suggest that RERJ1 plays a role as a transcriptional activator for regulating stress-inducible gene expression, with a strong correlation to JA accumulation in the stressed region.
• In this study, we found that RERJ1 is also expressed in rice plants in response to JA, and that its expression in rice leaves is up-regulated by exposure to wounding and drought stress.
• Involvement of the Basic Helix-Loop-Helix Transcription Factor RERJ1 in Wounding and Drought Stress Responses in Rice Plants.
• Our data suggest that OsbHLH6 controls disease resistance by dynamically regulating SA and JA signaling.
• Transgenic rice plants overexpressing OsbHLH6 display increased JA responsive gene expression and enhanced disease susceptibility to the pathogen.
• Nucleus-localized OsbHLH6 activates JA signaling and suppresses SA signaling; however, the SA regulator OsNPR1 (Nonexpressor of PR genes 1) sequesters OsbHLH6 in the cytosol to alleviate its effect.
• OsbHLH6 expression was upregulated during Magnaporthe oryzae infection.

Function-related keywords:

• jasmonic ,  drought ,  transcription-factor ,  jasmonic-acid ,  growth ,  ja ,  leaf ,  shoot ,  resistance ,  disease ,  disease-resistance ,  JA ,  magnaporthe-oryzae ,  sa ,  SA ,  pathogen ,  JA-signaling

Literature:

• RERJ1, a jasmonic acid-responsive gene from rice, encodes a basic helix-loop-helix protein .  DOI:  10.1016/j.bbrc.2004.10.126 ;  PMID:  15541369
• Stress-induced expression of the transcription factor RERJ1 is tightly regulated in response to jasmonic acid accumulation in rice .  DOI:  10.1007/s00709-012-0400-z ;  PMID:  22456953
• Involvement of the basic helix-loop-helix transcription factor RERJ1 in wounding and drought stress responses in rice plants .  DOI:  10.1271/bbb.69.1042 ;  PMID:  15914931
• A bHLH transcription activator regulates defense signaling by nucleo-cytosolic trafficking in rice .  DOI:  10.1111/jipb.12922 ;  PMID:  32129570

Related News:

Gene Resources:

• NCBI ID: AK242210
• UniProt accessions:

Sequences: