Difference between revisions of "Os06g0211200"

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OsAREB1,an ABRE-binding protein responding to ABA and glucosemay, may function as a positive regulator in drought/heat stresses response,
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The rice '''''Os06g0211200''''' was reported as '''''OsbZIP46''''' in 2012 <ref name="ref1" /> by researchers from China.  
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but a negative regulator in flowering time in Arabidopsis<ref name="refA" />.
 
  
 
==Annotated Information==
 
==Annotated Information==
 
===Function===
 
===Function===
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Firstly, overexpression of ''OsAREB1'' alters seedling sensitivity to ABA and glucose and OsAREB1 might have a crucial role in these two
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* '''''OsbZIP46''''' is one member of the third subfamily of bZIP transcription factors in rice (Oryza sativa)
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signaling pathways. Roots of transgenic plants were hypersensitive to ABA. Also,transgenic seeds were hypersensitive to glucose in germination period.
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* '''''OsbZIP46''''' is a positive regulator of ABA signaling and drought stress tolerance of rice depending on its activation.
 +
* The stress-related genes activated by '''''OsbZIP46CA1''''' are largely different from those activated by the other rice ABF/AREB homologs (such as OsbZIP23), further implying the value of '''''OsbZIP46CA1''''' in genetic engineering of drought tolerance.
  
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Secondly, 35S-OsAREB1 plants enhanced the resistance to drought and heat.Transgenic seeds can hold more water to stand against drought condition and up-regulate stress-related genes, such as ''RD29A'', ''RD29B''.  
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===Phenotypic analysis===
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* Overexpression of the native '''''OsbZIP46''''' gene increased ABA sensitivity but had no positive effect on drought resistance.  
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Thirdly, OsAREB1 delay the flowering time.by down-regulating the expression of flowering-related genes, such
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* The activation domain of '''''OsbZIP46''''' was defined by a series of deletions, and a region (domain D) was identified as having a negative effect on the activation. We produced a constitutive active form of '''''OsbZIP46''''' (OsbZIP46CA1) with a deletion of domain D. Overexpression of '''''OsbZIP46CA1''''' in rice significantly increased tolerance to drought and osmotic stresses.
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as ''FT'', SOC1, ''LFY''and ''AP1''.
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* Gene chip analysis of the two overexpressors (native '''''OsbZIP46''''' and the constitutive active form '''''OsbZIP46CA'''''1) revealed that a large number of stress-related genes, many of them predicted to be downstream genes of ABF/ AREBs, were activated in the '''''OsbZIP46CA1 '''''overexpressor but not (even down-regulated) in the '''''OsbZIP46''''' overexpressor.  
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* '''''OsbZIP46''''' can interact with homologs of SnRK2 protein kinases that phosphorylate ABFs in Arabidopsis.
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In other work ,A number of transcription factors
 
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(TFs) regulate stress-responsive gene expression. OsDREB1s and OsDREB2s were identified as abiotic-stress
 
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responsive TFs that belong to the AP2/ERF family. Similar to Arabidopsis, these DREB regulons were most likely not
 
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involved in the abscisic acid (ABA) pathway. OsAREBs such as OsAREB1 were identified as key components in ABAdependent transcriptional networks in rice.
 
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<ref name="refC" />
 
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The abscisic acid (ABA) responsive element (ABRE)
 
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binding protein (AREB)/ABRE binding factor (ABF) regulon functions in ABA-dependent gene expression
 
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under osmotic stress conditions
 
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Also,in ''Arabidopsis'', bZIP-type transcription factors AREBs/ABFs bind an abscisic acid
 
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(ABA)-responsive cis-acting element named ABRE and transactivate downstream gene expression inArabidopsis. Because AREB1
 
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overexpression could not induce downstream gene expression,
 
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activation of AREB1 requires ABA-dependent posttranscriptional
 
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modification. We confirmed that ABA activated 42-kDa kinase
 
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activity, which, in turn, phosphorylated Ser/Thr residues of R-XX-S/T sites in the conserved regions of AREB1. Amino acid substitutions of R-X-X-S/T sites to Ala suppressed transactivation activity, and multiple substitution of these sites resulted in almost
 
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complete suppression of transactivation activity in transient assays. In contrast, substitution of the Ser/Thr residues to Asp
 
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resulted in high transactivation activity without exogenous ABA
 
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application. A phosphorylated, transcriptionally active form was
 
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achieved by substitution of Ser/Thr in all conserved R-X-X-S/T sites
 
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to Asp. Transgenic plants overexpressing the phosphorylated active form of AREB1 expressed many ABA-inducible genes, such as
 
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RD29B, without ABA treatment. These results indicate that the
 
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ABA-dependent multisite phosphorylation of AREB1 regulates its
 
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own activation in plants.<ref name="refD" />
 
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The phytohormone abscisic acid (ABA) plays important roles in
 
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seed maturation and dormancy and is also involved in the
 
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adaptation of vegetative tissues to abiotic environmental stresses,
 
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such as drought and high salinity. ABA promotes stomatal closure
 
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in guard cells and regulates the expression of many genes, the
 
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products of which may function in dehydration tolerance in both
 
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vegetative tissues and seeds. Many ABA-inducible genes contain a
 
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conserved element named ABA-responsive element (ABRE) (PyACGTGG/TC) in their promoter regions. The ABRE functions as
 
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a cis-acting element and is involved in ABA-responsive gene expression.Each AREB protein
 
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contained a single bZIP-type DNA-binding domain, and expression
 
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ofAREB1andAREB2was up-regulated by ABA, drought, and
 
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high-salinity stresses, shown to function as trans-acting activators by
 
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using transient expression in protoplasts
 
  
 
===Expression===
 
===Expression===
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Expression patterns of the ''OsAREB1'' gene under various environmental stresses and hormones were analyzed by RT-PCR.
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* Expression of '''''OsbZIP46''''' was strongly induced by drought, heat, hydrogen peroxide, and abscisic acid (ABA) treatment; however, it was not induced by salt and cold stresses.
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OsAREB1 gene was induced within 1 or 2 h under 100 μM ABA and 15% PEG 6,000 treatments, and maintained the expression level for at least 8 hours. It’s expression was induced by heat within 1 h, and rapidly reached the top expression level within 2 h, then declined to initial level.
 
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OsAREB1 was not induced by KT, MeJA, NaCl and cold .These results indicated that OsAREB1was induced by exogenous ABA, water stress and heat. This result
 
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was consistent with the report of Lu et al.<ref name="refB" />.
 
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===Evolution===
 
===Evolution===
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Please input evolution information here.
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* '''''OsbZIP46''''' has high sequence similarity to ABA-responsive element binding factor (ABF/AREB) transcription factors ABI5 and OsbZIP23, two transcriptional activators positively regulating stress tolerance in Arabidopsis (Arabidopsis thaliana) and rice, respectively.
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Extending Knowledge
 
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===Binding activity===
 
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OsAREB1 has ABRE-binding activity in yeast
 
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Blast result indicated that OsAREB1 belongs to ABF subfamily.
 
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Most members of this subfamily can bind to the ABRE cis-element
 
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with a core sequence ACGTGCC. Yeast one-hybrid system was
 
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used to determine the DNA-binding activity of OsAREB1 with
 
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ABRE element. The entire coding region of OsAREB1 was fused
 
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to the GAL4 transcription active domain (TA). The construct
 
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was transformed into yeast (EGY48) harboring ABRE sequence  
 
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fused upstream of a lacZreporter gene, and the growth status of
 
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transformants was observed. Yeast cells harboring pPC86 and
 
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G222 could grow on SD medium lacking Trp, while cells only
 
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with G222 could not grow on the selection medium (Fig. 1A).
 
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The colony-lift filter assay suggested that OsAREB1 can bind to  
 
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the ABRE cis-element. Shown as Fig. 1B, when the colony grew
 
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on X-gal containing plate, only cells with pPC86-OsAREB1 and
 
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G222 turned blue, cells only with G222 or with both G222 and
 
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pPC86 did not turn blue. This result indicated that only
 
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OsAREB1 can bind to the ABRE cis-element and then active the
 
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expression of lacZ gene. Further, quantificational analysis for
 
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β-galactosidase activity was performed. Compared to the negative control, the relative β-galactosidase activity of the transformants was about four (Fig. 1C), which revealed there’s a distinct enhancement for β-galactosidase activity.
 
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[[File:DNA binding assay.jpg]]
 
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===AREB regulon===
 
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Abscisic Acid acts as a crucial signal molecule in abiotic
 
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stress responses (Fujita et al. 2011). The ABA content is
 
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increased by abiotic stresses, and leads to expression of
 
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numerous genes. Application of exogenous ABA also
 
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stimulates a myriad of genes. ABRE was identified as a
 
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cis-acting element conserved in promoter regions of
 
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ABA-inducible genes.ArabidopsiscDNAs that encode
 
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bZIP-type TFs were screened as ABRE-binding proteins
 
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(Yamaguchi-Shinozaki & Shinozaki 2006). Among these
 
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genes,AREB1/ABF2, AREB2/ABF4,andABF3were
 
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reported to be induced by ABA and osmotic stress in
 
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vegetative tissues (Fujita et al. 2011,). Evidence indicates
 
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that activation of AREB1 needs ABA-dependent posttranscriptional modification. The ABA-activated SnRK2
 
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protein kinases phosphorylate the AREB1 protein (Furihata et al. 2006). TransgenicArabidopsisplants overexpressing the phosphorylated active form of AREB1
 
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showed enhanced expression of a number of ABA-inducible genes (Furihata et al. 2006). The ABA-activated
 
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phosphorylation of AREB/ABFs was completely
 
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impaired in the SnRK2 triple mutant, srk2d srk2e srk2i
 
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(Fujii et al. 2009,; Fujii & Zhu 2009). The down-regulated genes in the srk2d srk2e srk2i andareb1 areb2
 
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abf3triple mutants largely overlapped in ABA-dependent expression, which supports the view that SRK2D/
 
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E/I regulate AREBs in ABA signaling in response to
 
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osmotic stress. (Fujita et al. 2009).
 
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The rice TRANSCRIPTION FACTOR RESPONSIBLE
 
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FOR ABA REGULATION1 (TRAB1) shows high homology toArabidopsisAREB2/ABF4. Expression ofTRAB1
 
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was up-regulated by ABA treatment (Hobo et al. 1999,).
 
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TRAB1 is phosphorylated rapidly in response to ABA treatment (Kagaya et al. 2002).  
 
  
 
You can also add sub-section(s) at will.
 
You can also add sub-section(s) at will.
  
 
==Labs working on this gene==
 
==Labs working on this gene==
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1
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* National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan 430070, China
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Biotechnology Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai,
 
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2
 
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College of Life Science and Technology, Yangzhou University, Jiangsu, PR China
 
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3
 
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*Biological Resources Division, Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki 305-8686, Japan;
 
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†
 
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Laboratory of Plant Molecular Biology, RIKEN Tsukuba Institute, Tsukuba, Ibaraki 305-0074, Japan;¶
 
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Graduate School of Agricultural and Life Sciences, University of Tokyo,
 
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Tokyo 113-8657, Japan;
 
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‡
 
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RIKEN Plant Science Center, Yokohama, Kanagawa 203-0045, Japan; and Core Research for Evolutional Science and Technology,
 
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Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
 
  
 
==References==
 
==References==
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<ref name="refA" /> Lu, G. J., Gao, C. X., Zheng, X. N. and Han, B. (2009) Identification of OsbZIP72 as a positive regulator of ABA response and drought tolerance in rice. Planta  229, 605-615.
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<references>
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* <ref name="ref1">
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<ref name="refC" /> Daisuke Todaka
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Tang N, Zhang H, Li X, Xiao J, Xiong L. Constitutive activation of
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1, Kazuo Nakashima1, Kazuo Shinozaki2and Kazuko Yamaguchi-Shinozaki1,3*(2012) Toward understanding transcriptional regulatorynetworks in abiotic stress responses and tolerance in rice  Rice 2012,5:6
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transcription factor OsbZIP46 improves drought tolerance in rice. Plant Physiol.  
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2012 Apr;158(4):1755-68. doi: 10.1104/pp.111.190389. Epub 2012 Feb 1. PubMed
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<ref name="refD" /> Takashi Furihata*, Kyonoshin Maruyama*, Yasunari Fujita*, Taishi Umezawa†‡, Riichiro Yoshida†, Kazuo Shinozaki†‡§,and Kazuko Yamaguchi-Shinozaki*§¶(2005) Abscisic acid-dependent multisite phosphorylation regulates the activity of a transcription activator AREB1.PNAS � February 7, 2006 � vol. 103 � no. 6
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PMID: 22301130; PubMed Central PMCID: PMC3320183.
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</ref>
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<ref name="refB" />Jin XF1, Xiong AS, Peng RH, Liu JG, Gao F, Chen JM, Yao QH. (2010) OsAREB1, an ABRE-binding protein responding to ABA and glucose, has multiple functions in Arabidopsis.BMB Rep 43(1):34-9.
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</references>
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==Structured Information==
 
==Structured Information==
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{{JaponicaGene|
 
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GeneName = Os06g0211200|
 
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Description = Similar to Abscisic acid responsive elements-binding factor (ABA-responsive element binding protein 1) (AREB1)|
 
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Version = NM_001063653.1 GI:115467037 GeneID:4340462|
 
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Length = 4829 bp|
 
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Definition = Oryza sativa Japonica Group Os06g0211200, complete gene.|
 
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Source = Oryza sativa Japonica Group
 
  
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  ORGANISM  Oryza sativa Japonica Group
 
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            Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
 
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            Spermatophyta; Magnoliophyta; Liliopsida; Poales; Poaceae; BEP
 
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            clade; Ehrhartoideae; Oryzeae; Oryza.
 
−
|
 
−
Chromosome = [[:category:Japonica Chromosome 6|Chromosome 6]]|
 
−
AP = Chromosome 6:5676158..5680986|
 
−
CDS = 5676361..5677152,5677846..5677917,5678514..5678543,5680499..5680575,5680665..5680668<br>|
 
−
GCID = <gbrowseImage1>
 
−
name=NC_008399:5676158..5680986
 
−
source=RiceChromosome06
 
−
preset=GeneLocation
 
−
</gbrowseImage1>|
 
−
GSID = <gbrowseImage2>
 
−
name=NC_008399:5676158..5680986
 
−
source=RiceChromosome06
 
−
preset=GeneLocation
 
−
</gbrowseImage2>|
 
−
CDNA = <cdnaseq>atggagttgccggcggatgggagcgcgctggcgaggcaggggtcgatctactcgctgacgttcgacgagttccagagcgcgctgggaagcgccgagaaggatttcgggtcgatgaacatggatgagctgctgcgcaacatctggacggcggaggagtcgcaggccatagcgccggcggcggcggctgcttcggcggcggcggtggttggggacgcgcagcagcagcagcagccgatccagaggcaggggtcgctgacgctgccacgcacgctgagccagaagacggtggacgaggtgtggcgcgacatcatgggcttgggcggcagcgacgacgaagaccccgcggcggcggcggctgcggcggcgcccgcgcagcggcagccgacgctgggggagatgacgctggaggagttcctggtgcgggccggcgtcgtgcgggaggacatggggcagaccatcgtgctgccgccgcaggcgcaggcgttgttccccgggagcaatgtggtcgccccggccatgcagctcgccaacgggatgctgcctggtgtcgtcggcgtcgcccccggcgccgccgccgcgatgacggtggcggcgccggccacgccggtggtgctgaacgggctggggaaggtggagggcggggatctctcgtcgctctcgccggtgccttacccattcgacaccgcgctcagggtgaggaagggccctaccgtcgagaaggtggtggagaggcggcagaggcggatgatcaagaacagggagtccgctgctaggtctcgcgcgcggaagcaggcttatataatggagttggaagctgaggtggcaaaactgaaggaacagaaggctgaattgcagaaaaagcaggtggaaatgatacagaagcaaaatgatgaggtcatggagagaatcactcagcaacttggaccaaaggcaaagagattttgcctccgacgaacactgactggtccatgctga</cdnaseq>|
 
−
AA = <aaseq>MELPADGSALARQGSIYSLTFDEFQSALGSAEKDFGSMNMDELL                    RNIWTAEESQAIAPAAAAASAAAVVGDAQQQQQPIQRQGSLTLPRTLSQKTVDEVWRD                    IMGLGGSDDEDPAAAAAAAAPAQRQPTLGEMTLEEFLVRAGVVREDMGQTIVLPPQAQ                    ALFPGSNVVAPAMQLANGMLPGVVGVAPGAAAAMTVAAPATPVVLNGLGKVEGGDLSS                    LSPVPYPFDTALRVRKGPTVEKVVERRQRRMIKNRESAARSRARKQAYIMELEAEVAK                    LKEQKAELQKKQVEMIQKQNDEVMERITQQLGPKAKRFCLRRTLTGPC</aaseq>|
 
−
DNA = <dnaseqindica>204..995#1689..1760#2357..2386#4342..4418#4508..4511#gattaaacctgatttccccttgctaattcgggccatcgcatcactcccccaactaatcacactcctctcttctccgcttcctcttctcgtatatttataaccccacttcccttttcttcctctttcttctcatcttggtttcttcctagtttcgggagaggattttagtgagggatttgaaggattttgaggtgggagaggagatggagttgccggcggatgggagcgcgctggcgaggcaggggtcgatctactcgctgacgttcgacgagttccagagcgcgctgggaagcgccgagaaggatttcgggtcgatgaacatggatgagctgctgcgcaacatctggacggcggaggagtcgcaggccatagcgccggcggcggcggctgcttcggcggcggcggtggttggggacgcgcagcagcagcagcagccgatccagaggcaggggtcgctgacgctgccacgcacgctgagccagaagacggtggacgaggtgtggcgcgacatcatgggcttgggcggcagcgacgacgaagaccccgcggcggcggcggctgcggcggcgcccgcgcagcggcagccgacgctgggggagatgacgctggaggagttcctggtgcgggccggcgtcgtgcgggaggacatggggcagaccatcgtgctgccgccgcaggcgcaggcgttgttccccgggagcaatgtggtcgccccggccatgcagctcgccaacgggatgctgcctggtgtcgtcggcgtcgcccccggcgccgccgccgcgatgacggtggcggcgccggccacgccggtggtgctgaacgggctggggaaggtggagggcggggatctctcgtcgctctcgccggtgccttacccattcgacaccgcgctcagggtgaggaagggccctaccgtcgagaaggtggtggagaggcggcagaggcggatgatcaagaacagggagtccgctgctaggtctcgcgcgcggaagcaggtgaagcctctcttctcttcaactgcactaggatgtaggaatacgtagcaatcttatgtccatttgcttgattaattagttctgaaaattcgatggtgcctatatttggtatgcctctcgataatgctgtactttattcacatgatgtgatccccccacttctaattcagcttgtagatgttaatttatgcctaatagccactgcaaatagcaagttagcgtcgttaaatattgttcaaccacagaggataagaatctaaagtgaataagccatggttcaagttgatgctctcagattcagagagatgatgagtggctttgttcatttcgggacactggctgagcggtgtttttttttttttttggatcgactattgctgtgatagggatagcatgctcaccatgaagcttggaaggacaattgacaagaccaattcgagaaatagtaacttccgttgatcttttctttaaaaaaaaaacttgtgggggtaataggtcttttttatgtgcaagttgtgctgccatgatgcactcatacttctataaaagctagtatatacttttattgttctaacatagcaaggtcaagtctttctgatactctgattgacagagaatagttctagacagttatggttgtgttgcgaaacacaattttttaacattaaattttggctttctgatatacaacaggcttatataatggagttggaagctgaggtggcaaaactgaaggaacagaaggctgaattgcagaaaaagcaggtatacctgctgtcatataaaattgctttgatccatgcatactctttatttttttctgtttctcttaccaattcctgtaatcagttagtagtccttagataacctcttgactttggataattcctatgtttcttgcctcgattgtcatatttgtttggggatttgggcttaccaatggctgttgttttaatctacccccagcaatgcttgttgctggtattgcaatatgtaggtgaccacaaatagcattcaaatgtccttgttctatgtatttcctgtggaatttatctgagttcaaatctttaatggttgttggaggtttgcacttaaaaggtgtatccctttttaatttgaacattgatggggttacattaattttgtattactgtcctgcaaacttgtattgaaatcctatgccatctggtatcttcttgttcacacattttccatgtgcctactattgttatgccagtatgtcattgtatcatgattttgtaattgaataacttaacaaaagcaccaaaccttttcttcttccaaattcctgacaaaaaatccatgaagctttattcacttattatgcttctaatttgcaggtggaaatgatacagaagcaaaatgatgaggtaatgaccttacagttggtagtaaataccatggttctgaattcgcactatgtttgtcctcattgatgtggaagttgtctatacctctttttgatcataccatactttcttcttttttaaataaaaaacaagagtaagttcatttccacaaacttgctgattaagggatctttggatctgggtgaattttttggggcatttgcaagtttggactaaagttctgatgacttgaatccagataccctctatatccaaacagacccaaattggggcaaaacaacaagctaactctatcgaaccaattcgtttttcttgctgtgagcctttcctaaaactggcagacgccttagaatctccatggctgaagtttgtcaaagtgcacaacaacagtagcattaggtcatttattagagctgcatgacattcaaattctttttaatgagctgcacaacaacatgcacgatttcccaattctggctgtgaggtgtgtttgttattgcattttttgtggtcatgtcagaaaatatcttactacatatggtttaaattatgtttcagaaatcccttattctttaaccaactgccatcataaatgtatatgctggtgttggccatatatttcatgtcactgacactctggcctcttatcccttctcattttcattcatgtatcatgttatctatgtagggtcattgtgttacatccatcttcagttttttaacactttagtgccatccacttgtggttttttttttcataaaataaatttgaagaaactaacagagatatgcaatactggaactcctgccattgcaatagaaaattagcacatcatgattttcagctatcacagtgtggattactgtgatgtgttttttgttaaaaaaaaatgtacactactttgtcctacactcgtccctgctgtcaaataattgagtttgccatgtacagagtaaatgtccagatgtgcaccattctgaatatggtatcccattttgggcatgcatgcttgtaacaccaaaattctgttggagaacatactacccaataagctcaaggtttcattttcaaaatctagttatctgtaattcccatgtcattatagttaaagtatttaattttctaccttctgttttatttttaactaatcagttcaattttttaaccaaagaatgatactcttttaccagggagatctgaagtgacttattggacatacaatgctaaaacaacaaactaaaacaacaaaatggacattgggtaggtttgtctgggtggtatgctcaacccagtctgatctggagtattaaaaagaatcctgactctaaatttagtccaccgctactatagacgctatagtgagcctgtccagcattcaaattaaggacattagttgtgttcgtttctaatggttgggaaccttccccctctagcatgtaaaacggagcaacgatttagcacacgatcaattaagtattagctaaaaaaaacttgaaaaaatggattaatataattttttaaaccaacttttctatagaaagtttttctagaaaacacattgtttagcagttttggaagcgtgcgtgcggaaaacaagtgagtagaggtgggaaagtgtagggaagatgtcatgttggtttgaattttgaaagtctgcaaactcttactaatgttacataaatagttttggttgctactctgcggtttcaagcagtaaacctctgcctcaatcattctgaagtttaagcatttctttgattataatcagtacagttagaaggccttaactgggtgcatttttatgttccgacttctgacgatctcactgaaatctgacaagtgttttctagctgaagatagtacattttactagatgctttgcaatgttgagaaagttctcttcatagattcttctttccctaacaggagttttatctataaatggattttgcaggtcatggagagaatcactcagcaacttggaccaaaggcaaagagattttgcctccgacgaacactgactggtccatggtaagttgatcaagtttgcacagcattgaccaaagttaagatcgttggcttccttggatgtgaccaatcgccgcgtgtatatatatcagctgaagccagagtctccggtttcgccgtggcgctcagcttcagagttgcttctctccttgttggtgaatggtgatggctcagtctcttggacggtcgaatgctggcgtcgattactcactaggtttagctgcgagatcgttgcgtgagcaaaggcatactatctaatctgtttaactccttatttagggaaatctggcatggtgaaaacggggcatgccatctgtgtttgttgtttttgtgcagctgttgcatctgctctgtatgttgctgttgcgttgacatgtcatcccgtttacagttcagtgattctgttctgtaccc</dnaseqindica>|
 
−
Link = [http://www.ncbi.nlm.nih.gov/nuccore/NM_001063653.1 RefSeq:Os06g0211200]|
 
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}}
 
 
[[Category:Genes]]
 
[[Category:Genes]]
 
[[Category:Japonica mRNA]]
 
[[Category:Japonica mRNA]]

Latest revision as of 05:53, 22 October 2016

The rice Os06g0211200 was reported as OsbZIP46 in 2012 [1] by researchers from China.

Annotated Information

Function

  • OsbZIP46 is one member of the third subfamily of bZIP transcription factors in rice (Oryza sativa)
  • OsbZIP46 is a positive regulator of ABA signaling and drought stress tolerance of rice depending on its activation.
  • The stress-related genes activated by OsbZIP46CA1 are largely different from those activated by the other rice ABF/AREB homologs (such as OsbZIP23), further implying the value of OsbZIP46CA1 in genetic engineering of drought tolerance.

Phenotypic analysis

  • Overexpression of the native OsbZIP46 gene increased ABA sensitivity but had no positive effect on drought resistance.
  • The activation domain of OsbZIP46 was defined by a series of deletions, and a region (domain D) was identified as having a negative effect on the activation. We produced a constitutive active form of OsbZIP46 (OsbZIP46CA1) with a deletion of domain D. Overexpression of OsbZIP46CA1 in rice significantly increased tolerance to drought and osmotic stresses.
  • Gene chip analysis of the two overexpressors (native OsbZIP46 and the constitutive active form OsbZIP46CA1) revealed that a large number of stress-related genes, many of them predicted to be downstream genes of ABF/ AREBs, were activated in the OsbZIP46CA1 overexpressor but not (even down-regulated) in the OsbZIP46 overexpressor.
  • OsbZIP46 can interact with homologs of SnRK2 protein kinases that phosphorylate ABFs in Arabidopsis.

Expression

  • Expression of OsbZIP46 was strongly induced by drought, heat, hydrogen peroxide, and abscisic acid (ABA) treatment; however, it was not induced by salt and cold stresses.

Evolution

  • OsbZIP46 has high sequence similarity to ABA-responsive element binding factor (ABF/AREB) transcription factors ABI5 and OsbZIP23, two transcriptional activators positively regulating stress tolerance in Arabidopsis (Arabidopsis thaliana) and rice, respectively.

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Labs working on this gene

  • National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan 430070, China

References

  1. ↑ Tang N, Zhang H, Li X, Xiao J, Xiong L. Constitutive activation of transcription factor OsbZIP46 improves drought tolerance in rice. Plant Physiol. 2012 Apr;158(4):1755-68. doi: 10.1104/pp.111.190389. Epub 2012 Feb 1. PubMed PMID: 22301130; PubMed Central PMCID: PMC3320183.

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