CN1935835A - Thinopyrum intermedium ERF-transcription factor and its coding gene and use - Google Patents

Abstract

The invention discloses a middle couch grass ERF transcription factor and its coding gene. The middle couch grass ERF transcription factor can be the protein with one of the following amino acid residues sequences that SEQ ID No: 2 in sequence list; or its amino acid residues sequence which is replaced and/or missed and/or added with one or many amino acid residues, and relevant to plant against disease against reverse performance. The transcription expression of the coding gene is greatly induced by rhizoctonia cerealis, salt, cold, ethylene etc. The TiERF1 of the invention supplies the base for the relevant gene expression, gene resources for gene engineering breeding, and will play an importance role in increasing plant against disease against reverse performance for gene engineering breeding.

Description

Middle couchgrass ERF transcription factor and encoding gene and application

Technical field

The present invention relates to a plant ERF transcription factor and encoding gene thereof and application, ERF transcription factor and the encoding gene thereof of particularly a kind of middle couchgrass are with the application of this gene in cultivating disease-resistant plants, adversity resistant plant.

Background technology

At present, biologies such as various disease and pests are coerced, are coerced with abiotic stresses such as arid, salt marsh, low temperature, are the important factors of production developments such as restriction farm crop, woods grass and vegetables.For example, change along with factors such as cropping system, fertilizer and water condition and weather condition, silborne fungal diseases such as wheat hypochnus, head blight and gas borne fungus diseases such as wheat powdery mildew, stripe rust are serious day by day in causing harm of China wheat main producing region, gently then cause wheat yield 20-30%, heavy then underproduction 40-50%, even total crop failure.The arid of China, semiarid arable land amount to 5.7 hundred million mu, account for 38% of national cultivated area, and China causes hundred million kilograms of grain drop in production 700-800 because of lack of water every year.In addition, China produces about 20,000,000,000 kilograms of grain less because of the saltings every year, also has 5.54 hundred million mu of salt-affected soils to remain to be developed or the raising per unit area yield.

Cultivate and promote disease-resistant worm, the adversity resistant plant kind is to improve its output and quality, guarantees national food safety and the effective way of improving the ecological environment.Though utilize plant self disease-resistant gene and some anti contravariance related genes, aspect disease-resistant, breeding for stress tolerance, obtained some progress.But at present available disease-resistant and anti contravariance related gene resource-constrained, and exist problems such as disease-resistant variety is short-lived, anti-adversity is undesirable, be difficult to satisfy the demand of producing at present with ecological improvement.In recent years, about the particularly fast development of correlated response approach progress of research and genetic engineering technique of plant disease-resistant molecular mechanism and degeneration-resistant reaction mechanism, for the utilization genetic engineering means improves disease resistance of plant and resistance shows tempting prospect.

Plant has been developed a series of replies biologies and has coerced the reaction mechanism of coercing with abiotic stress in the long-term evolution process, grow to guarantee it.The experimental results to plants such as Arabidopis thalianas shows, plant can be by disease-resistant gene or other gene perception and identification pathogen or environment stress signal, start the signal transducting system of compact cascade type then, and then induce the defence gene with function in a series of downstreams such as relevant (PR) gene of the course of disease, or adversity gene is expressed.In the signal conductive process, transcription factor has important regulation.The ERF transcription factor is a plant specific class important transcription factor relevant with defense response.ERF transcription factor (be also referred to as EREBP, element responsive to ethylene is conjugated protein) has the DNA land of a high conservative, i.e. the structural domain of ERF/AP2 DNA land, and the ERF/AP2 structural domain is made up of about 60 amino acid.According to reports such as Sakuma, the difference of 2 amino-acid residues that the ERF/AP2 structural domain is the 14th, the 19th, determining the specific combination (Allen etc. of transcription factor and different cis-acting elements, 1998, A novel mode of DNA recognition by a β-sheet revealed bythe solution structure of the GCC-box binding domain in complex with DNA, EMBO J, 17:5484-5496; Sakuma et al, 2002, DNA-binding specificity of the ERF/AP2 domain of Arabidopsis DREBs, transcription factors involved indehydration-and cold-inducible gene expression.Biochem.Biophys.Res.Comun.290:998-1009), can be a word used in person's names propylhomoserin (V) with DRE cis element bonded AP2 structural domain the 14th amino acid, the 19th is L-glutamic acid (D), and can be L-Ala (A) with GCC-box bonded ERF/AP2 structural domain the 14th amino acid, the 19th is that (Hao etc. 1998 for aspartic acid (D), Unique mode of GCC-box recognitionby the DNA-binding domain of ethylene-responsive element, Bio.Chem., 273:26857-26861).GCC-box is the cis-acting elements that contains the GCCGCC conserved sequence and be subjected to the ethene regulation and control, mainly be present in the promotor of the disease-resistant defence of a large amount of alkalescence (PR) gene, (Hao etc. 1998 also to contain GCC-box in the promotor of some abiotic stress response genes, Unique mode of GCC-box recognition by theDNA-binding domain of ethylene-responsive element, Bio.Chem., 273:26857-26861; Ohme-Takagi etc. 1995, Ethylene-inducble DNA binding proteins thatinteract with ethylene-responsive element, Plant Cell, 7:173-182; Fujimoto etc. 2000, Arabidopsis ethylene-responsive element binding act astranscriptional activators or respressors of GCC BOX-mediated geneexpression, Plant Cell, 12:393-404).Tomato Pti4/5/6 belongs to Arabidopis thaliana ERF1, AtERF1-AtERF5, AtERF13 that (Zhou etc. 1997 with disease-resistant relevant ERF transcription factor, The Pro kinase conferringresistance to tomato bacterial speck disease interacts with proteins that binda cis-element of pathogen attack and osmotic stress in tobacco, EMBO J, 16:3207-3232; Solano etc. 1998, Nuclear events in ethylene signaling:atranscritional cascade mediated by EHYLENE-INSENSITIVE 3 andEHYLENE-RESPONSE-FACTOR1, Genes DEV., 3703-3714; Fujimoto etc. 2000, Arabidopsisethylene-responsive element binding act as transcriptional activators orrespressors of GCC BOX-mediated gene expression, Plant Cell, 12:393-404; Gutterson and Reuber, 2004, Regulation of disease resistance pathways byAP2/ERF transcription factors, Current Opinion in Plant Biology, 7:465-471).

Many ERF genes overexpression in plant can improve the resistance against diseases of plant.The overexpression of Pti can improve plants such as tobacco, tomato and Arabidopis thaliana, and (Thara etc. 1999 to the resistance of bacillary and fungal disease, Pseudomonassyringae pv.tomato induces the expression of tomato EREBP-like genes Pti4 andPti5 independent of ethylene, salicylate acid and jasmonate, PlantJ, 20:475-484; Gu etc., 2002, Tomato transcription factors Pti4, Pti5 and Pti6activate defense responses when expressed in Arabidopsis, Plant Cell, 14:817-831; Fujimoto etc. 2000, Arabidopsis ethylene-responsive element bindingact as transcriptional activators or respressors of GCC BOX-mediated geneexpression, Plant Cell, 12:393-404), and have certain broad effect spectrum.Arabidopis thaliana ERF1 crosses expression and can improve resistance to downright bad nutritious fungus Botrytis cinerea and Plectosphaeralla cucuneria and soil-borne fungus Fusariam Oxysporum (Berroecal-Lobo etc. 2002, Constitutiveexpression of EHYLENE-RESPONSE-FACTOR1 in Arabidopsis confers resistance toseveral necrophic fungi, Plant J, 29:23-32; Berrocal_Lobo etc. 2004, EHYLENE-RESPONSE-FACTOR1 mediates Arabidopsis resistance to the soilbornefungus Fusarium oxysporum, MPMI, 17 (7): 763-770).Some ERF transcription factor may be the joint of a plurality of signal transduction paths of disease-resistant and degeneration-resistant reaction.Can reply (the Park etc. that work in the anti-reactant salt at plant defense and abiotic stress simultaneously as tobacco EREBP Tsil gene, 2001, Overexpression ofthe tobacco Tsil gene encoding an EREBP/AP2-type transcription factorsenhances resistance against pathogen attack and osmotic stress in tobacco, Plant Cell, 13:1035-1046).Tobacco AP2/EREBP transcription factor OPBP1 crosses expression can improve resistance and the salt resistance ability (Guo etc. of tobacco to Pseudomonas syringae and Phytophthora parasitica pathogenic bacteria, 2004, Overexpression of the AP2/EREBP transcription factor OPBP1 enhancesdisease resistnce and salt tolerance in tobacco, Plant Mol.Biology, 55:607-618), therefore, disease-resistant from some, separating clone ERF class transcription factor in the plant with adverse resistance, on purpose cultivated the plant of expressing above-mentioned ERF class transcription factor by genetically engineered, not only can improve the disease resistance of plant, also can improve the salt resistance of plant, drought resistance or resistance to cold.

Couchgrass (Thinopyrum intermedium) in the middle of the nearly edge wild plant of wheat, have multiple disease-resistant genes such as anti-stripe rust of wheat, Powdery Mildew, yellow dwart, streak mosaic disease, head blight and banded sclerotial blight, and have proterties such as drought-enduring, cold-resistant, salt tolerant alkali.Therefore, separating clone ERF class transcription factor is studied its characteristic and mechanism of action from middle couchgrass, has important significance for theories and practical value for the disease resistance and the resistance that improve important crop and other plant.

Summary of the invention

The purpose of this invention is to provide a kind of middle couchgrass ERF transcription factor and encoding gene thereof.

Couchgrass ERF transcription factor in the middle of provided by the present invention, name is called TiERF1, and couchgrass in the middle of deriving from is the protein with one of following amino acid residue sequences:

1) the SEQ ID № in the sequence table: 2;

2) with SEQ ID № in the sequence table: 2 amino acid residue sequence through the replacement of one or several amino-acid residue and/or disappearance and/or interpolation and with disease resistance of plant, protein that resistance is relevant.

The replacement of described one or several amino-acid residue and/or disappearance and/or interpolation are meant replacement and/or the disappearance and/or the interpolation of no more than ten amino-acid residues.

Wherein, the sequence in the sequence table 2 is made up of 293 amino-acid residues.ERF/AP2 DNA binding domains is positioned at aminoterminal the 144th to the 202 amino acids residue from sequence 2, should conservative territory the 14th (from the 157th of the aminoterminal of sequence 2) amino-acid residue be third amino acid (A), the 19th (from the 162nd of the aminoterminal of sequence 2) amino acid is aspartic acid (D), and this structural domain can interact with the cis-acting elements of element responsive to ethylene GCC core and start the expression of disease-resistant defence gene or degeneration-resistant response gene.The C of sequence 2 end (from the 243rd of the aminoterminal of sequence 2 to 247 amino acids residues) has the nuclear localization signal (KRRKR) of an alkalescence, and the N end contains 1 tart active region (from the 51st of the aminoterminal of sequence 2 to 75 amino acids residues).

The encoding gene (TiERF1) of couchgrass ERF transcription factor also belongs to protection scope of the present invention in the middle of above-mentioned.

The cDNA gene of couchgrass ERF transcription factor in the middle of above-mentioned can have one of following nucleotide sequence:

1) SEQ ID № in the sequence table: 1 dna sequence dna;

2) SEQ ID № in the code sequence tabulation: the polynucleotide of 2 protein sequences;

3) under the rigorous condition of height can with SEQ ID № in the sequence table: the nucleotide sequence of the 1 dna sequence dna hybridization that limits.

The rigorous condition of above-mentioned height can be 65 ℃ of hybridization in hybridization solution, in 0.1 * SSC (0.1 * SSPE) and the solution of 0.1%SDS in, wash film under 65 ℃ of conditions.

Wherein, the SEQ ID № in the sequence table: 1 is made up of 1418 deoxynucleotides, is encoding sequence from the 10th to 891 deoxynucleotides of 5 ' end.

TiERF1 cDNA sequence NCBI comparison shows that, ERF gene BiERF3 (AY831394) homology of TiERF1 Partial cDNA Sequence and paddy rice, utilize DNAMAN that TiERF1 full length cDNA sequence and BiERF3 full length sequence are compared, its homology only is 50%, the homology of nucleotide sequence of the ERF gene of the nucleotide sequence of TiERF1 and other definite functions is very low, not in the comparison.The aminoacid sequence of TiERF1 compares at NCBI, the result shows, the ERF transcription factor of TiERF1 and the disease-resistant function of some tools: Arabidopis thaliana AtERF1, ERF1, tomato Pti4, LeERF1, ERF5, TSRF1, Pti5 and tobacco ERF2, NtERF1 are in AP2 dna structure territory conserved regions tool 73-90% homology, but the 20-38% homology is only arranged with these proteic full length sequences, with the homology of paddy rice BiERF3 amino acid (AAV98702.1) be 67.3%, these show that TiERF1 is 1 new middle couchgrass ERF transcription factor.

Contain expression carrier of the present invention, clone and host bacterium and all belong to protection scope of the present invention.

TiERF1 gene of the present invention can import, be building up in the expression vector of existing plant with existing method, can before it transcribes super beginning Nucleotide, add any promotor that comprises constitutive promoter, strengthens promotor, inducible promoter, tissue-specific promoter, etap specificity promoter, be not limited only to monocotyledons, also can be dicotyledons by plant transformed.As, with TiERF1 gene of the present invention and other a kind or several gene recombination, make up the expression vector of multivalent genetic and change plant over to; With other a kind or several gene fusion, construction of expression vector also changes plant over to; Collaborative mutually with other a kind or several gene, construction of expression vector changes same plant acceptor at the same time or separately over to respectively.Can utilize any carrier and introduction method that can guide foreign gene in plant, to express, in TiERF1 gene transfered plant of the present invention or its cell or tissue, to obtain to have plant disease-resistant, anti-adversity ability.

Experimental results show that TiERF1 gene transcription of the present invention is expressed is subjected to intensive such as pathogenic bacteria, salt, ethene and induces, and also suffers from drought, cold inducing.Yeast one-hybrid analysis experiment shows, TiERF1 of the present invention combination specifically, regulation and control contain the ERF cis element, and (core sequence: AGCCGCC) gene transcription is expressed, TiERF1 of the present invention can be the disease-resistant defence gene of artificial control, anti-(anti-) retrocorrelation expression of gene provides the basis, for plant disease-resistant, the breeding of adversity gene engineering provide new genetic resources, will in cultivating disease resistance, anti-(anti-) contrary property enhanced plant, play an important role.

Description of drawings

Fig. 1 is the result with gene specific primer pcr amplification TiERF1 full-length gene.

Fig. 2 A detects the influence of sheath blight fungus to TiERF1 genetic expression for sxemiquantitative RT-PCR.

Fig. 2 B is that Northern hybridization detects the influence of NaCl to TiERF1 genetic expression.

Fig. 2 C detects the influence of arid to TiERF1 genetic expression for sxemiquantitative RT-PCR.

Fig. 2 D detects the influence of low temperature to TiERF1 genetic expression for sxemiquantitative RT-PCR.

Fig. 2 E detects the influence of ethene to TiERF1 genetic expression for sxemiquantitative RT-PCR.

Fig. 3 is the vivoexpression electrophoresis detection collection of illustrative plates of TiERF1 gene in intestinal bacteria

Fig. 4 analyzes the situation of TiERF1 gene and GCC-BOX specific combination for yeast one-hybrid

Embodiment

Experimental technique among the following embodiment if no special instructions, is ordinary method.Should be noted that embodiments of the invention only play illustration and unrestricted effect to the present invention.

The clone and the sequential analysis of embodiment 1, middle couchgrass ERF transcription factor gene

Middle couchgrass is (26 degree) three weeks of growth at room temperature, and a part of plant adopts toothpick and rubbing manipulation inoculation rhizoctonia cerealis in the leaf sheath place and blade of middle couchgrass seedling, and the root system of a part of plant places 250mm NaCl aqueous solution immersion treatment.Get the middle couchgrass blade that inoculation sheath blight fungus 24 hours or NaCl handled 5 hours, utilize Trizol (Invitrogen company product) method, extract total RNA, be dissolved in the DEPC water, detect through agarose gel electrophoresis.Get total RNA that good, the no DNA of 5ug quality pollutes, adopt Invitrogen Corporation's Super script First-Strand Synthesis System for RT-PCR test kit (Invitrogen), with Oligo d (T) _12-18Be primer, carry out the synthetic of cDNA first chain according to the operation of test kit specification sheets method.According to wheat EST fragment (the NCBI number of landing CN010562.1, CK195316.1, CN012725, AL821943, CN011872.1) 1 pair of primer of design, sequence is as follows: upstream primer pER-U1:5 '-ACG GCG AGG ATG CTGCTG AAC-3 ', downstream primer pER-U2:5 '-CGA TCT CGG AGC GGA TGC GGA-3 '.The first chain cDNA with couchgrass in the middle of above-mentioned is a template, carries out pcr amplification, and 25 μ L amplification systems are: 1 * GC damping fluid, 1 μ L cDNA (100ng), 200 μ mol/L dNTPs, every primer of 0.2 μ mol/L, 1U LA-Taq enzyme; Amplification condition is 94 ℃ of pre-sex change 1min of elder generation; Then 94 ℃ 30 seconds, 62 ℃ 30 seconds, 72 ℃ of 1min, totally 35 circulations; Last 72 ℃ are extended 5min.The PCR product is connected on the pMD18-T carrier (available from Takara company) behind recovery, purifying, is transformed among the intestinal bacteria TOPO 10, utilizes above-mentioned pER-U1 and pER-U2 primer to carry out bacterium colony PCR, selects 5 positive colonies order-checkings.Show through The sequencing results, obtained middle couchgrass ERF transcription factor TiERF1 gene 5 ' end group because of fragment (from 5 of sequence 1 ' the 1st the-the 637th deoxynucleotide of end).

Adopt 3 of GIBCO-BRL '-RACE test kit (catalog number is #18373-019), according to its method that provides operation clone TiERF1 gene 3 ' terminal sequence.For guarantee 3 '-RACE PCR product really is 3 ' terminal sequence of special goal gene, adopts nest-type PRC amplification strategy, promptly according to goal gene TiERF15 ' end group because of segmental nucleotide sequence, design 23 '-the upstream primer RP of RACE ₁, RP ₂: RP ₁Primer sequence: 5 '-AGTTCGCGGCGGAGATC-3 ', RP ₂Primer sequence: 5 '-ACCTACGACACCGCCGAGGA-3 ', use RP earlier ₁AUAP primer (downstream primer in upstream primer and the test kit, the AUAP primer sequence: 5 '-GGCCACGCGTCGACTAGTAC-3 '), with 3 '-the first chain cDNA of RACE test kit reverse transcription synthetic mesophase couchgrass carries out first round amplification as template, and then make template with 50 times first round PCR product of dilution, with RP ₂(upstream primer) and AUAP (downstream primer) carry out second and take turns pcr amplification, reclaim purified pcr product, connect and be cloned on the pMD18-T carrier, by bacterium colony PCR, select 5 positive colony order-checkings, The sequencing results shows, obtains the 3 ' terminal sequence (from 5 of sequence 1 ' the 529th the-the 1418th deoxynucleotide of end) of TiERF1 gene.Wherein, first round PCR reaction conditions: 94 ℃ of 1min of elder generation; 94 ℃ of 30s → 58 ℃ 30s → 72 ℃ of 1min30s, totally 10 circulations then; 94 ℃ of 30s → 56 ℃ 30s → 72 ℃ of 1min30s, totally 25 circulations again; Last 72 ℃ of 5min.25 μ L reaction systems are: 1 * GC damping fluid, 1 μ L cDNA (100ng), 200 μ mol/L dNTPs, every primer of 0.2 μ mol/L, 1U LA-Taq enzyme.

Second takes turns the PCR reaction conditions: 94 ℃ of pre-sex change 2min of elder generation; 94 ℃ of 30s then, 63 ℃ of 30s, 72 ℃ of 2min, totally 10 circulations; 94 ℃ of 30s → 61 ℃ 30s → 72 ℃ of 2min, totally 25 circulations again; Last 72 ℃ of 5min.25 μ L reaction systems are 1 * GC damping fluid, 1 μ L cDNA (100ng), 200 μ mol/L dNTPs, every primer of 0.2 μ mol/L, 1U LA-Taq enzyme.

TiERF1 5 ' terminal sequence and 3 ' terminal sequence in external packing, are obtained the TiERF1 full length cDNA sequence.For obtaining effable TiERF1 gene clone, according to the TiERF1 full length cDNA sequence, design 1 couple of Auele Specific Primer TiE-F:5 '-ACG GCG AGG ATG CTG CTG AAC-3 ' again, TiE-R 5 '-GGTTGCTTTGCCGGATTGCTC-3 ' is a template with middle couchgrass cDNA or genomic dna, carry out pcr amplification, the reaction system of 25 μ L PCR is: 1 * GC damping fluid, 1 μ L, DNA (100ng), 200 μ mol/L dNTPs, 0.2 every primer of μ mol/L, 1U LA-Taq enzyme.Response procedures is: 94 ℃ of pre-sex change 2min of elder generation; 94 ℃ of 30s then, 65 ℃ of 30s, 72 ℃ of 2min, totally 10 circulations; 94 ℃ of 30s → 63 ℃ 30s → 72 ℃ of 2min, totally 25 circulations again; Last 72 ℃ of 10min.Amplified production carries out agarose electrophoresis, and the result shows with middle couchgrass cDNA or genomic dna to be that the PCR product size that obtains of template is identical as shown in Figure 1.Swimming lane 1 is a template for middle couchgrass cDNA among the figure; 2 is that middle couchgrass genomic dna is a template; M is 100bp ladder molecular weight marker (sky is epoch bio-engineering corporation's product).The PCR product that obtains is connected in the pMD18-T carrier checks order, obtain a sequence with sequence 1 in the sequence table and with the on all four cDNA clone of external packaging sequence, the unnamed gene that will have sequence 1 in the sequence table is TiERF1.This full length gene cDNA sequence is 1418bp (sequence 1 in the sequence table), the open reading frame that contains 882bp, originate in 10bp, end at 891bp, the TiERF1 that coding is made up of 293 amino-acid residues (sequence 2 in the sequence table), ERF/AP2DNA is positioned at from 5 ' end 439-615bp (encoding sequence 2 from aminoterminal the 144th to 202 amino acids residue) in conjunction with domain encoding sequence, should conservative territory the 14th amino acids be third amino acid (A), the 19th amino acids is aspartic acid (D), and this structural domain can start the expression of disease-resistant defence gene or degeneration-resistant response gene with the cis-acting elements interaction of element responsive to ethylene GCC core.

The C of TiERF1 end (from the 243rd of the aminoterminal of sequence 2 to 247 amino acids residues) has the nuclear localization signal (KRRKR) of an alkalescence, and the N end contains 1 tart active region (from the 51st of the aminoterminal of sequence 2 to 75 amino acids residues).

TiERF1 cDNA sequence NCBI comparison shows that, ERF gene BiERF3 (AY831394) homology of TiERF1 Partial cDNA Sequence and paddy rice, utilize DNAMAN that TiERF1 total length CDNA sequence and BiERF3 full length sequence are compared, its homology only is 50%, the homology of nucleotide sequence of the ERF gene of the nucleotide sequence of TiERF1 and other definite functions is very low, not in the comparison.The aminoacid sequence of TiERF1 compares at NCBI, the result shows, Arabidopis thaliana AtERF1, the ERF1 of TiERF1 and the disease-resistant function of some tools, tomato Pti4, LeERF1, ERF5, TSRF1, Pti5 and tobacco ERF2, NtERF1 are in AP2 dna structure territory conserved regions tool 73-90% homology, but the 20-38% homology is only arranged with these proteic full length sequences, with the homology of paddy rice BiERF3 amino acid (AAV98702.1) be 67.3%, these show that TiERF1 is 1 new plant ERF transcription factor.

The abduction delivering analysis of embodiment 2, TiERF1 gene

Middle couchgrass is carried out the following processing of coercing respectively: pathogenic bacteria, 250mM NaCl, arid, low temperature, 2mM ethephon solution (ET) are handled, and concrete treatment process is as follows:

Pathogenic bacteria is handled: inoculate the wheat hypochnus mycelia with friction and tooth mirror method respectively on the middle couchgrass blade in three weeks of growth, get blade respectively at inoculation back 0h, 2h, 5h, 12h, 24h, liquid nitrogen freezing ,-70 degree are preserved.

Salt is handled: the root system of the middle couchgrass plant around will growing places the 250mM NaCl aqueous solution respectively, gets blade behind 0h, 2h, 5h, 10h, 24h, liquid nitrogen flash freezer, and-70 degree are preserved standby.

Arid is handled: middle the couchgrass seedling in four week of will grow is got blade through washing after being placed at room temperature dewater on the filter paper that is enough to suck dry moisture 0h, 2h, 5h, 10h only, liquid nitrogen flash freezer, and-70 to spend preservation standby.

Low temperature stress is handled: the middle couchgrass plant around will growing is got blade after placing 4 ℃ (low temperature) to handle 0h, 2h, 5h, 10h, liquid nitrogen flash freezer, and-70 degree are preserved standby;

In 2mM ethephon solution (ET) solution, 0h, 2h, 24h get blade after processing respectively, liquid nitrogen flash freezer, and-70 degree are preserved standby.

Employing Trizol method is extracted the total RNA in the above-mentioned blade, get the synthetic first chain cDNA of the total RNA reverse transcription of 1ug, earlier with constructive expression's Actin gene primer each sample that increases, make the initial concentration unanimity (being homogenization) of amplification template mRNA/cDNA, then with TiERF1 gene specific primer TiE-F and TiE-R each sample cDNA that increases, carry out sxemiquantitative RT-PCR, to study this expression of gene feature; Or make probe with TiERF1 gene cDNA sequence (sequence 1), carry out Northern hybridization by molecular cloning method.The result shows that the expression of TiERF1 gene transcription is subjected to inducing of sheath blight fungus, under normal operation, detection is less than the TiERF1 expression of gene, after sheath blight fungus infects 2 hours, TiERF1 expression of gene amount begins to increase, reached maximum value in 5 hours infecting, the expression amount that infects 12 hours and 24 hours is stabilized in maximum value (Fig. 2 A); The TiERF1 gene transcription is expressed and is subjected to inducing of salt stress, under normal operation, detection is less than the TiERF1 expression of gene, the 250mM NaCl aqueous solution was handled after 2 hours, TiERF1 expression of gene amount begins to increase, coerce and reached maximum value in 5 hours, the expression amount of coercing 10 hours and 24 hours is stabilized in maximum value (Fig. 2 B); The TiERF1 gene transcription is expressed and is subjected to inducing of arid, under normal operation, detect less than the TiERF1 expression of gene, drought stress is after 2 hours, TiERF1 expression of gene amount increases, coerce 5 hours with the expression amount of coercing 10 hours consistent with the expression amount of coercing 2 hours (Fig. 2 C); The TiERF1 gene transcription is expressed and also is subjected to cryogenic inducing, under normal operation, detect less than the TiERF1 expression of gene, cold coerce 2 hours after, TiERF1 expression of gene amount increases, coerce 5 hours with the expression amount of coercing 10 hours consistent with the expression amount of coercing 2 hours (Fig. 2 D); The TiERF1 gene transcription is expressed and to be subjected to inducing of ethene, under normal operation, detects less than the TiERF1 expression of gene, and it is the highest that ethene is handled 2 hours expression amount, 24 hours expression amount descend to some extent (Fig. 2 E).More than experiment shows that the TiERF1 gene transcription is expressed and is subjected to sheath blight fungus, salt, drought, cold, ethene etc. and induces.

Embodiment 3, the vivoexpression of middle couchgrass TiERF1 gene in intestinal bacteria

According to 1 pair of Auele Specific Primer of 1 design of the sequence in the sequence table, and add enzyme recognition site EcoRI and XhoI at primer two ends, upstream and downstream, the concrete following AP1 5 ' of sequence-CCGAATTCCCGACGACTCCGACGACA-3 ', AP25 '-TTCTCGAGCTAGCTGACCAGCTGCTGC-3 '; Comprise AP2 dna structure territory and both sides sequence by pcr amplification TiERF1, obtain the cDNA fragment of about 700bp, cut goal gene amplified fragments and fusion protein expression vector PGEX-4T-1 (available from Amersham company) with EcoRI and XhoI (Takara) enzyme, purifying, recovery target gene fragment and carrier segments.Pass through T ₄DNA ligase is inserted into TiERF1 after the GST site of PGEX-4T-1, be transformed into then in the e. coli bl21 cell, picking list bacterium colony, cultivate, extract plasmid, identify carrying out PCR with AP1 and AP2 primer, and order-checking, the bacterial strain called after PGST-ERF1 that contains the TiERF1 gene that confirms through evaluation.With PGST-ERF1 37 ℃ of cultivations in the LB liquid nutrient medium, add 1mM IPTG and induce, induce centrifugal collection thalline behind the 4h; Fusion rotein according to Microspin GST Purification Moduleprotocol (Amersham) method purifying, recovery abduction delivering.Through the SDS-PAGE gel electrophoresis analysis, the result is shown in Figure 3, and showing through the inductive bacterial strain has the about 43KD of a fusion rotein band (arrow shows), illustrates that TiERF1 can express translation in intestinal bacteria.Among Fig. 3, M is marker, and 0 is the total lysate of inductive fusion protein expression vector cell not, and 4C is the total lysate of fusion protein expression vector cell of inducing 4 hours, and 4P is the fusion rotein of inducing 4 hours purifying.

The specific combination of embodiment 4, TiERF1 and GCC-BOX sequence

2 parts of cis-acting elements GCC-box of synthetic (ATAAGAGCCGCCACTAAATAAGAGCCGCCACTAA), and two ends add (the GGATCC ATAAGAGCCGCCACTAAATAAGAGCCGCCACTAACTGCAG) of BamHI and PstI restriction enzyme site, be connected between the BamHI and PstI restriction enzyme site of the multiple clone site of HIS reporter gene upstream among the report carrier pHIS2 (Clontech.), be transformed among the yeast strain Y187 (Clontech.) according to the Clontech laboratory manual, as the sub-yeast Y187-GCC of report.

The sub-yeast competent cell of preparation report: the inoculation diameter is that the yeast strain Y187-GCC bacterium colony that contains reporter gene (GCC-BOX) of 2-3mm is in 1mL YPD liquid nutrient medium, thermal agitation 2 minutes, disperse behind the agglomerate suspension to be gone in the triangular flask that contains 50mL YPD liquid nutrient medium, 30 ℃ of 250rpm, overnight incubation is to OD ₆₀₀Be 1.6, this culture transferred among the 300 mL YPD that 30 ℃ of 250rpm cultivate about 3 hours to OD ₆₀₀Be 0.3-0.4, the centrifugal 5min of 1000g collects thalline, abandons supernatant, suspends with 100mL1 * TE, and is centrifugal, abandons supernatant, and with 1.5mL1 * TE/LiAc solution suspension cell precipitation, fully mixing is yeast competent cell liquid.

Operational manual according to Clontech, TiERF1 gene cDNA sequence (sequence 1) is inserted into the multiple clone site of yeast GAL4 activation domain expression vector pGADT7-RAC2 (Clontech.), and identifying the correct fusion vector called after pGAD-ERF1 that contains the TiERF1 gene cDNA sequence, transform, extract plasmid.

Transform (according to the Clontech method): take out 2.5 μ g pGAD-ERF1 plasmid DNA (is contrast with pGADT7-RAC2), 5 μ L salmon sperm dnas (10mg/ml), 500 μ L report sub-yeast Y187-GCC competent cell liquid and 500 μ L LiAc/PEG, behind the thorough mixing, vibrated 20 seconds at a high speed, cultivated 30 minutes for 30 ℃, every vibration in 10 minutes 1 time, add 20 μ l DMSO, put upside down mixing gently, 42 ℃ of water-bath heat-shockeds 15 minutes were mixed 1 time gently every 5 minutes, freezing on ice 2 minutes, high speed centrifugation 15 seconds is abandoned supernatant, adds 1ml YPD ⁺Substratum (available from Clontech.) suspends again, and 30 ℃ are incubated 90 minutes, and high speed centrifugation 15 seconds is abandoned supernatant, with 1mLNaCl (0.9%) suspension cell again.Being coated with 150 μ l cell transformed (His/-Ura/-Trp/SD) on the substratum (available from Clontech.), cultivated 3-4 days for 30 ℃ to the auxotrophy substratum that contains 3-AT (competitive inhibitor of His3 gene product).The result as shown in Figure 4, show change pGAD-ERF1 over to yeast can contain 5mM3-AT-grow on the His/-Ura/-Trp/SD substratum; And change over to pGADT7-RAC2 yeast can not contain 5mM3-AT-grow on the His/-Ura/-Trp/SD substratum.The albumen that the TiERF1 genes encoding is described can combine with the cis-acting elements GCC-box of HIS reporter gene upstream specifically, and then activates transcribing of HIS reporter gene effectively.Among Fig. 41 and 2 for the yeast that changes control plasmid pGADT7-RAC2 over to contain 3-AT-can not growing state on the His/-Ura/-Trp/SD substratum, 3 and 4 for the yeast that changes the pGAD-ERF1 plasmid over to containing 3-AT-the His/-Ura/-Trp/SD substratum on growing state.

Sequence table

<160>2

<210>1

<211>1418

<212>DNA

＜213〉couchgrass (Thinopyrum intermedium) in the middle of

<400>1

acggcgagga?tgctgctgaa?cccggcctcg?gaggcgctgg?tgctcgacag?catcaggcag 60

cacctcatgg?aggagacggc?ggccgtggcg?gcgccggcgg?aggcgaggag?gcagaggccg 120

gcctactgcc?ggagcaccag?cttcgggagc?ctggtggccg?accagtggag?cgagtcgctc 180

ccgttccgcg?ccgacgactc?cgacgacatg?gtcgtctacg?gcgcgctccg?cgacgccttc 240

tcctgcggct?ggctccccga?cggctccttc?gccgccgtca?agccggagcc?cctgccttcc 300

ccggactcct?acgcgtgcga?cggcccgtcg?tgcttcggtt?tcctcgagcc?ggagacgcct 360

ccggccacgc?ccccgggcga?gggcgaggag?gccacggcgt?tcatgggcga?ggcggccgcc 420

gcggtggcca?gggggaagca?ctaccgaggg?gtgcggcagc?ggccgtgggg?caagttcgcg 480

gcggagatcc?gggacccggc?caagaacggc?gcgcgcgtgt?ggctcggcac?ctacgacacc 540

gccgaggacg?ccgccgtggc?gtacgaccgc?gccgcgtacc?gcatgcgcgg?ctcccgcgcg 600

cttctcaact?tcccgctccg?catcggctcc?gagatcgccg?ccgcaaaagc?cgcggccgcg 660

gccgccggcg?acaagcgtcc?gtcgcccgag?cccgcgacct?cggactcgtc?ctcctcctcc 720

tcgtccgggt?ccccgaaaag?aaggaagagg?ggcgaggccg?cggccgcgtc?catggccatg 780

gcgctggtgc?cgccgccctc?ccagctgagc?cggccggccc?aggcgtggta?ccccgccgcg 840

ccggtcgagc?aggtggccat?ggcgccgcgc?gtgcagcagc?tggtcagcta?ggccccgcgt 900

gccagccacc?gggcgcacga?tcgtaaaaga?caatgcgcaa?gtgcaatgga?tcgatcagca 960

agtgcatgga?cgcgacagca?acatgagccc?gcctttcact?gttgcacggt?gcaaggtggt 1020

gatggcaatg?gagtgcgatg?ccgatcgagc?gagcgagcaa?tccggcaaag?caaccttagc 1080

gacggctcca?tttggatatt?tggatgggcc?gagaaaggaa?gataagctcg?gagcaactgg 1140

gtgctgcaat?ttggtctgga?atgacagttc?ctcctctgtc?tgctcggtgc?aactcgccca 1200

agtggatcaa?agcgaaactg?tgctagtagt?atcgggtcgt?cgtggtccgt?tgtgagtcgt 1260

agggttatat?ttgcgtcgct?gtcagagtgc?gtgtggtaaa?aattacaccc?ttgtgatcga 1320

gcttaatgga?agttgtgaaa?ctgtacaagc?atctgtagag?agaattccag?ggagtgaatt 1380

cttaccccat?catcaaaaaa?aaaaaaaaaa?aaaaaaaa 1418

<210>2

<211>293

<212>PRT

＜213〉couchgrass (Thinopyrum intermedium) in the middle of

<400>2

Met?Leu?Leu?Asn?Pro?Ala?Ser?Glu?Ala?Leu?Val?Leu?Asp?Ser?Ile?Arg

1 5 10 15

Gln?His?Leu?Met?Glu?Glu?Thr?Ala?Ala?Val?Ala?Ala?Pro?Ala?Glu?Ala

20 25 30

Arg?Arg?Gln?Arg?Pro?Ala?Tyr?Cys?Arg?Ser?Thr?Ser?Phe?Gly?Ser?Leu

35 40 45

Val?Ala?Asp?Gln?Trp?Ser?Glu?Ser?Leu?Pro?Phe?Arg?Ala?Asp?Asp?Ser

50 55 60

Asp?Asp?Met?Val?Val?Tyr?Gly?Ala?Leu?Arg?Asp?Ala?Phe?Ser?Cys?Gly

65 70 75 80

Trp?Leu?Pro?Asp?Gly?Ser?Phe?Ala?Ala?Val?Lys?Pro?Glu?Pro?Leu?Pro

85 90 95

Ser?Pro?Asp?Ser?Tyr?Ala?Cys?Asp?Gly?Pro?Ser?Cys?Phe?Gly?Phe?Leu

100 105 110

Glu?Pro?Glu?Thr?Pro?Pro?Ala?Thr?Pro?Pro?Gly?Glu?Gly?Glu?Glu?Ala

115 120 125

Thr?Ala?Phe?Met?Gly?Glu?Ala?Ala?Ala?Ala?Val?Ala?Arg?Gly?Lys?His

130 135 140

Tyr?Arg?Gly?Val?Arg?Gln?Arg?Pro?Trp?Gly?Lys?Phe?Ala?Ala?Glu?Ile

145 150 155 160

Arg?Asp?Pro?Ala?Lys?Asn?Gly?Ala?Arg?Val?Trp?Leu?Gly?Thr?Tyr?Asp

165 170 175

Thr?Ala?Glu?Asp?Ala?Ala?Val?Ala?Tyr?Asp?Arg?Ala?Ala?Tyr?Arg?Met

180 185 190

Arg?Gly?Ser?Arg?Ala?Leu?Leu?Asn?Phe?Pro?Leu?Arg?Ile?Gly?Ser?Glu

195 200 205

Ile?Ala?Ala?Ala?Lys?Ala?Ala?Ala?Ala?Ala?Ala?Gly?Asp?Lys?Arg?Pro

210 215 220

Ser?Pro?Glu?Pro?Ala?Thr?Ser?Asp?Ser?Ser?Ser?Ser?Ser?Ser?Ser?Gly

225 230 235 240

Ser?Pro?Lys?Arg?Arg?Lys?Arg?Gly?Glu?Ala?Ala?Ala?Ala?Ser?Met?Ala

245 250 255

Met?Ala?Leu?Val?Pro?Pro?Pro?Ser?Gln?Leu?Ser?Arg?Pro?Ala?Gln?Ala

260 265 270

Trp?Tyr?Pro?Ala?Ala?Pro?Val?Glu?Gln?Val?Ala?Met?Ala?Pro?Arg?Val

275 280 285

Gln?Gln?Leu?Val?Ser

290

Claims (8)

1, a kind of middle couchgrass ERF transcription factor is the protein with one of following amino acid residue sequences:

1) the SEQ ID № in the sequence table: 2;

2) with SEQ ID № in the sequence table: 2 amino acid residue sequence through the replacement of one or several amino-acid residue and/or disappearance and/or interpolation and with disease resistance of plant, protein that resistance is relevant.

2, the encoding gene of the described middle couchgrass ERF transcription factor of claim 1.

3, encoding gene according to claim 2 is characterized in that: the encoding gene of couchgrass ERF transcription factor in the middle of described has one of following nucleotide sequence:

1) SEQ ID № in the sequence table: 1 dna sequence dna;

2) SEQ ID № in the code sequence tabulation: the polynucleotide of 2 protein sequences;

3) under the rigorous condition of height can with SEQ ID № in the sequence table: the nucleotide sequence of the 1 dna sequence dna hybridization that limits.

4, the expression vector that contains the encoding gene of claim 2 or 3 described middle couchgrass ERF transcription factors.

5, the clone that contains the encoding gene of claim 2 or 3 described middle couchgrass ERF transcription factors.

6, the host bacterium that contains the encoding gene of claim 2 or 3 described middle couchgrass ERF transcription factors.

7, described middle couchgrass ERF transcription factor of claim 1 and the application of encoding gene in cultivating disease-resistant plants thereof.

8, described middle couchgrass ERF transcription factor of claim 1 and the application of encoding gene in cultivating adversity resistant plant thereof.

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