CN105452280A

CN105452280A - Leucine zipper protein bZIP-4 from thellungiella halophila, and coding gene and use thereof

Info

Publication number: CN105452280A
Application number: CN201380078599.4A
Authority: CN
Inventors: 孙超; 陈文华; 崔洪志
Original assignee: Genesis Seed Industry Co ltd
Current assignee: Genesis Seed Industry Co ltd
Priority date: 2013-09-26
Filing date: 2013-09-26
Publication date: 2016-03-30
Also published as: WO2015042737A1

Abstract

Provided are a leucine zipper protein bZIP-4 from thellungiella halophila, a coding gene thereof, and a use thereof in breeding a transgenic plant with improved drought tolerance.

Description

Leucine zipper protein bZIP-4 from thellungiella halophila, and coding gene and use thereof

A kind of small salt mustard leucine zipper protein 6ZJP-$ and its encoding gene and application

The present invention relates to vegetable protein and its encoding gene and application, the more particularly to one leucine zipper protein/^ and its encoding gene from small salt mustard, and its application in the genetically modified plants that drought tolerance is improved are cultivated for technical field.The environment stresses such as background technology temperature, salt marsh and arid can cause to seriously endanger to growing for higher plant, cause crop yield to reduce, quality decline is serious to threaten agricultural production and natural environment.Wherein influence of the arid to crop yield, first place is accounted in many natural adverse circumstances, and it is endangered equivalent to other disaster sums, be many areas be agricultural development bottleneck.According to statistics, world's arid, semiarid zone account for the 34% of land area;China's arid, semiarid zone account for the 52% of area, year area suffered from drought up to 200-270 ten thousand hectares, the national billion cubic meter of the annual water shortage in irrigation district about 30 receives 350-400 hundred million kilograms of grain because of water shortage less；Particularly China relationship and primary grain producing such as North China, northeast and northwest, is the area of China's water shortage most serious, and spring drought frequently reaches 10 years nine chances.

Drought resistance in plants belongs to the quantitative character of controlled by multiple genes mostly, is lacked using the drought resistance of conventional breeding methods Crop Improvement by cycle length, quality germplasm and is limited.The Preliminary Study of transcription group in recent years, protein science and gene expression regulation discloses the effect molecule mechanism of plant drouhgt stress.At present, the drought-resistant ability of plant is improved using drought stress related gene, the study hotspot and the important research direction of plant stress-resistance genetic engineering of plant stress-resistance molecular biology is had become.

Plant is by that can produce corresponding responsing reaction during environment stress, to reduce or eliminate the harm that environment stress comes to vegetational zone.This responsing reaction of plant is a complex process for being related to polygenes, multi signal approach and polygenes product.But for current research situation, because its mechanism is sufficiently complex, many plants still need to be studied to the biochemistry under adverse circumstance and physiological response mechanism.In the research in terms of the function and expression regulation of degeneration-resistant response gene important basis is provided by the research that network system is transmitted in the contact between the signaling pathways related to plant stress-resistance and whole signal.Content of the invention the present inventor utilizes SSH (Subtractive hybridizations）With RACE (cDNA ends rapid amplifyings）The method being combined has cloned a kind of encoding gene of leucine zipper protein (being named as bZIP-4 herein) of small salt mustard, and determines its DNA sequence.And it was found that being conducted into after plant overexpression, the drought tolerance of transfer-gen plant is can obviously improve, and these characters can stablize heredity. First aspect present invention provides a kind of leucine zipper protein bZIP-4 of small salt mustard encoding gene（ThbZIP-4 is named as herein)；Preferably, its sequence is SEQ ID N0: 2.

Second aspect of the present invention provides a kind of recombinant expression carrier, it contains the gene described in first aspect present invention, its be by by the gene be inserted into it is a kind of be used to building the carrier is carrier of the recombinant expression carrier and obtain, and the nucleotide sequence of the gene is operably connected with the expression control sequence of the carrier is carrier；Preferably, the carrier is carrier is pCAMBIA2300_;Preferably, the recombinant expression carrier is the 35S-r shown in accompanying drawing 2) Z/P-$-2300 carriers.

Third aspect present invention provides a kind of recombinant cell, and it contains the recombinant expression carrier described in gene or second aspect of the present invention described in first aspect present invention；Preferably, the recombinant cell is restructuring agrobatcerium cell.

Fourth aspect present invention provides a kind of method of improvement drought resistance in plants, including：Recombinant expression carrier described in gene or second aspect of the present invention described in first aspect present invention is imported into plant or plant tissue and makes the gene expression；Preferably, the plant is arabidopsis.

Fifth aspect present invention provides a kind of method of prepare transgenosis plant, including：The plant containing the recombinant expression carrier described in the gene or second aspect of the present invention described in first aspect present invention or plant tissue are cultivated under conditions of plant is effectively produced；Preferably, the plant is arabidopsis.

Gene, the recombinant expression carrier described in second aspect of the present invention or the recombinant cell described in third aspect present invention that sixth aspect present invention is provided described in first aspect present invention are used to improve drought resistance in plants and the purposes for plant breeding；Preferably, the plant is arabidopsis.

Seventh aspect present invention provides the protein of the gene code described in first aspect present invention, its amino acid sequence such as SEQ ID NO:Shown in 1.Brief description of the drawings Fig. 1 be ThbZIP-4 plant expression vector (358- Γ) Ζ/Ρ -) structure flow（Scheme la-lb).

Fig. 2 is ThbZIP-4 plant expression vector<;358- Γ) Ζ/Ρ-$-2300) plasmid figure.

Fig. 3 is ThbZIP-4 T1 for transgenic Arabidopsis plants（In figure, T1A2) and it is used as the non-transgenic Arabidopsis plant of control（In figure, CK) drought-enduring simulated experiment result.（Fig. 3 a are the normal growth Arabidopsis plant of 20 days；Fig. 3 b are normal growth Osmotic treatment Arabidopsis plant of 14 days after 20 days）.

T1 under Fig. 4 drought stresses and normal growing conditions is for transgenic Arabidopsis plants and adjoining tree ABA changes of contents testing results.1-7 is followed successively by strain（From left to right）：T1A1, T1A2, T1A3, T1A4, T1A5, T1A6, CK, wherein T1A1, T1A2, T1A3, T1A4, T1A5, T1A6 are transfer-gen plant, and CK is adjoining tree.

Fig. 5 is that transgenosis T1 verifies knot for the protein expression of Arabidopsis plant and non-transgenic reference plant on transcriptional level Really.M is DNA Ladder Marker (DL2000, TakaRa), and the drought-enduring transgenic arabidopsis Tl of 1-7 are for plant（It is followed successively by：T1A1, T1A2, T1A3, T1A4, T1A5, T1A6, T1A7), 8-11 compares for non-transgenic arabidopsis；12-16 is not drought-enduring transgenic arabidopsis T1 for plant.

The present invention is further described with reference to non-limiting example for embodiment.The embodiment is not intended to limit the scope of the present invention merely for exemplary purpose.

The restriction enzyme in the unreceipted source mentioned in example below is purchased from New England Biolabs companies.Small salt mustard SSH library constructions under the drought stress of embodiment 1

Specific method is：

Utilize the PCR-select of Clontech companies^TMMethod shown in cDNA Subtraction Kit builds subtracted library by Subtractive hybridization method.MRNA using the blade of the salt mustard seedling of Osmotic treatment in experimentation is used as sample（), Tester the mRNA using the blade of untreated small salt mustard seedling is used as control（Driver specific steps are summarized as follows：

(1) material to be tested：

Small salt mustard（T ellungiella halophila, purchased from inner mongolia Ba Yan Nor City carex meyeriana green plants garden halophytes Breeding Center）, it is seeded on sterilized vermiculite, in 25 °C, 16 hours photoperiods illumination/8 hour dark（The Lx of light intensity 2000-3000) under the conditions of cultivate, 1/2MS culture mediums are poured weekly（9.39mMKN0₃, 0.625 mMKH₂P0₄, 10.3 mMNH₄N0₃, 0.75 mMMgSO₄, 1.5 mMCaCl₂, 50 μ Μ Κ Ι, 100 μ Μ H₃B0₃, 100 MMnSO₄, 30 μ Μ ZnS0₄, 1 μΜ Na₂Mo0₄, 0.1 μ Μ CoCl₂, 100 μΜ Na₂EDTA, 100 MFeSO₄)-secondary.It is used to test when seedling plant height is up to 25-30 cm.

(2) material process：

2 groups, every group of 4 basins, per 1 plant of basin will be divided into for examination seedling.First group is control group, is cultivated under 25 °C, 16 hours photoperiods illumination/8 hour dark condition, normal to pour.Second group is Osmotic treatment group, 25 °C, cultivate under 16 hours photoperiods illumination/8 hour dark condition, stops pouring, processing 10 days, the blade of two groups of seedling apicals 1/3 of timely clip after being disposed, after liquid nitrogen quick freeze, is preserved in -70 °C of refrigerators.

(3) Total RNAs extraction：

Control group and the small g of salt mustard blade 0.5 of Osmotic treatment group are taken respectively, use plant RNA extraction kit（Purchased from Invitrogen) extract the total serum IgE of small salt mustard blade.Surveyed with the ultraviolet specrophotometer U-2001 of HITACHI companies Total serum IgE is determined in 260 nm and 280 nm absorbance, OD₂₆₀/OD₂₈₀Ratio is 1.8-2.0, shows that total serum IgE purity is higher；The integrality of total serum IgE is detected with 1.0% agarose gel electrophoresis, the brightness of 28S bands is about 2 times of 18S bands, shows that RNA integrality is good.Use the Oligotex mRNA purification kits of Qiagen companies（Purification of poly A+ RNA from total RNA) separation mRNA.

(4) Subtractive hybridization：

By the PCR-select of Clontech companies^TMMethod shown in cDNA Subtraction Kit kits carries out Subtractive hybridization.Driver mRNA and Tester mRNA are first distinguished into reverse transcription, double-strand cDNA, then the progress subtractive hybridization using 2 Tester cDNA and 2 g Driver cDNA as parent material is obtained.Then the Tester cDNA after digestion are divided into joints different in two equal portions, connection by Tester cDNA and Driver cDNA Rsa I digestions 1.5 hours respectively under 37 °C of water-baths, and Driver cDNA are not connected to head.Two kinds of Tester cDNA for being connected with different joints are mixed with excessive Driver cDNA respectively, carry out positive subtractive hybridization for the first time.The product of two kinds of first time subtractives hybridization is mixed, then second of positive subtractive is carried out with the Driver cDNA that are newly denatured and is hybridized, the fragment of differential expression is then expanded by inhibition PCR twice, it is enriched with.

In order to have increased access to EST（Expressed sequence tag, EST) the validity of (Unigene), avoid gene without restriction enzyme site and obtained sequence in non-translational region, digestion is carried out to Tester cDNA and Driver cDNA by above-mentioned steps with restriction endonuclease Haelll simultaneously for this experiment and priority carries out positive subtractive hybridization and inhibition PCR amplifications twice twice, finally merges second of inhibition PCR primer that two groups of positive subtractives hybridize cDNA fragments.

(5) structure of cDNA subtracted libraries and preliminary screening, clone, identification

According to the program of pGEM-T Easy kits, the positive subtractive of above-mentioned merging is hybridized to second of PCR primer of cDNA fragments（Purified using QIAquick PCR Purification Kit, purchased from Qiagen) it is connected with pGEM-T Easy (being purchased from Promega kits) carrier, it is comprised the following steps that：Following ingredients are sequentially added with 200 μ PCR pipes：The positive subtractive of purifying hybridizes second of PCR primer, 31,2 χ Τ of μ, 4 ligase buffer solutions 5 μ 1, pGEM-T Easy carriers 1 μ 1, the μ of T4 DNA ligases 1 of cDNA fragments, is stayed overnight in 4 °C of connections.10 coupled reaction products are taken, are added in 100 competence e. coli jm109s (being purchased from TAKARA), ice bath 30 minutes, heat shock 60 seconds, ice bath 2 minutes separately add 250 μ L LB nutrient solutions（1% Tryptone is purchased from OXOID, 0.5% Yeast Extract are purchased from OXOID, 1% NaCl is purchased from traditional Chinese medicines) put in 37 °C of water-baths, with 225 revs/min of shaken cultivations 30 minutes, take 200 μ L bacterium solutions to be coated on containing 50 g/mL ampicillins（Purchased from TIANGEN Biotech (Beijing) Co., Ltd.）LB (ibid）(X-gal/IPTG is purchased from TAKARA to/X-gal/IPTG, and lg packagings are configured to 20 mg/ml mother liquors, and its working concentration is：The ml LB culture mediums of 200 μ of above mother liquor 1/100;IPTG is purchased from TaKaRa, and 5g packs the mother liquor for being configured to 100 mM concentration, and its working concentration is：The μ Ι of above mother liquor 100/lOOml LB culture mediums）On solid culture flat board, 37 °C are cultivated 18 hours.Count diameter in culture plate> 1 mm Clear white and blue colonies number, random 198 white colonies of picking (numbering：Gh-B001 to Gh-B198).All white colonies are inoculated in containing 50 μ respectively_§In 96 porocyte culture plates (CORNING) of the LB fluid nutrient mediums of/η Λ ampicillins, glycerol adding is saved backup to final concentration 20% in -80 °C after 37 °C of overnight incubations.With nest-type PRC primer Primer 1 and Primer 2R, (the PCR-select cDNA Subtraction Kit kits of Clontech companies are carried）Bacterium solution PCR amplification checkings are carried out, 166 positive colonies is obtained, is then sending Invitrogen by all positive colonies（Shanghai）Trade Co., Ltd is sequenced.

(6) the cDNA sequencing analysis of differential cloning：

After the cDNA that DNA sequencing result is removed to carrier and indefinite sequence and redundancy, 123 EST (Unigene are obtained；).There are 22 contigs through analysis, there are 101 single sequences.Find that wherein 53 EST (Unigene) have homologous sequence in GenBank through BlastN, 21 EST Unknown Functions are hypothesis albumen, separately there are 27 not obtain homologous matching, thus it is speculated that to be probably the shorter sequence in 3' or 5' ends non-translational region.The salt mustard leucine zipper protein encoding gene ThbZIP-4 of embodiment 2 clone

Clone YLS-16 removes after redundant DNA, and sequence is SEQ ID No:3, sequence analysis shows that the protein of the coding of the sequence belongs to leucine zipper protein, the corresponding total length encoding genes of clone YLS-16 is named as into ThbZIP-4 herein, its corresponding albumen is named as bZIP-4.

SEQ ID No: 3

The clone of GGGACCG TA AGCCCTGTTT CATCAGACGG GTTAGGACAT GGACAAGTGG ATAACATAGG AAGTCAGTAT GGAGTGGATA GGGAGGGTT AAGGGGAAGG AAAAGAGTAG GGATGGTCC AGTGGAGAAA GTAGTGGAAA GAAGGGAGAG GCGGATGATC AAGAACCGTG AGTCTGCTGC AAGGTCTAGA GCAAGAAAGC AGGCGTATAC AGTGGAATTA GAAGGGGAAT TGAACCAGTT GAAAGAAGAG AATGCGCAGC TAAAACA GC ATTGGGGGAG TTGGAGAGAA AGAGGAAGCA ACAGTAT TT GAGACTTTGA AGACAAGAGC ACAACCGAAG TTGCGGAAGG CGAGCGGGAG ATTGGGGACA TTGATGAGGA ACCCGAGT G TCCGCTCTGA bZIP-4 total length encoding genes

According to the SEQ ID No obtained:3 sequence analyses, SEQ ID No:3 be encoding gene 6Z/P-$ 3 terminal sequences.According to the SEQ ID NO obtained:3 sequences, design following three specific primers, are used as reverse transcription primer and 5 ' RACE specific primer.

YLS-16GSP1 ( SEQ ID NO: 4 ) ：

GATCATCCGCCTCTGCCTTC YLS-16GSP2 ( SEQ ID NO: 5 ) ：

GACCATCCACTACTCTTTTCC YLS-16 GSP3 ( SEQ ID NO:6) ：

GGACCGTTAAGCCCTGTTTC

Kit carries universal primer：

AAP ( SEQ ID NO: 7 ) ：

GGCCACGCGTCGACTAGTACGGGIIGGGIIGGGIIG AUAP ( SEQ ID NO: 8 ) ：

GGCCACGCGTCGACTAGTAC experimental procedures are operated by kit specification（5'RACE System for Rapid Amplification of cDNA Ends kits are purchased from Invitrogen companies）.

With YLS-16GSP1 (SEQ ID N0:4) it is reverse transcription primer, reverse transcription is carried out by template of small salt mustard mRNA, obtain cDNA templates, then Poly C tails are added according to the step in above-mentioned 5'RACE kit specifications, the amplification of first round PCR is carried out by template of the product after tailing, the primer is SEQ ID NO:4 and universal primer SEQ ID NO:7 (kit is carried, and I is a, c, g or t) that Hypoxanthine is modified, and is comprised the following steps that：

50 μ PCR reaction systems：5 μ Ι Ο Ε χ Buffer, the 3 μ 1 2.5 mM μ Ex of dNTP, the cDNA of 2.0 μm of RNA reverse transcriptions, 1.0 Taq (being purchased from TAKARA), 10 μ Μ primer SEQ ID NO:4 and SEQ ID NO:7 each 2.0 μ 1, and 35 μ distilled water.PCR reaction conditions：94 °C of pre-degenerations 5 minutes, 33 circulations（94 °C are denatured 50 seconds, and 55 °C are annealed 50 seconds, and 72 °C extend 1 minute）, 72 °C extend 10 minutes.

The PCR primer of gained takes 2.0 μ as template after diluting 50 times with distilled water, with SEQ ID NO:5 and universal primer SEQ ID NO:8, which carry out second, takes turns PCR amplifications, comprises the following steps that：

50 μ PCR reaction systems：The first round PCR product of 5 μ Ι Ο Ε χ Buffer, 3 μ 2.5 mM dNTP, 2.0 μ dilution, 1.0 l Ex Taq, 10 μ Μ primer SEQ ID NO:5 and SEQ ID NO:8 each 2.0 μ 1, and 35 μ distilled water.PCR reaction conditions：94 °C of pre-degenerations 5 minutes, 33 circulations（94 °C are denatured 50 seconds, and 55 °C are annealed 50 seconds, and 72 °C extend 1 minute）, 72 °C extend 10 minutes.Reclaim in second of PCR primer be about 500bp sizes band（Gel Extraction Kit are purchased from OMEGA), and pGEM-T Easy Vector are connected to, being then transformed into JM109, (specific method is ibid）, random 10 white colonies of picking are inoculated in the LB fluid nutrient mediums containing 50 g/mL ampicillins and cultivate respectively, and glycerol adding is to final concentration 20% (v/v) after 37 °C of overnight incubations, and -80 °C save backup.With primer SEQ ID NO:5 and 3' ends primer SEQ ID NO:6 carry out bacterium solution PCR amplifications（Reaction system and reaction condition are ibid）, obtain 4 positive colonies（YL16-1, YL16-3, YL16-5 and YL16-6), send Invitrogen（Shanghai）Trade Co., Ltd's sequencing sequencing, obtains the cDNA of the gene one section of 5' terminal sequence. It is SEQ ID NO that the sub- YL16-3 sequencings of 5 ' RACE product clonings of gained, which obtain sequence,: 9：

1 GGGGGGGGGG CGGCGGTGAG ATCGCGGCTA GACAACCAAC TTTTGGGGAG ATGACGCTTG

61 AAGATTTCTT GGTCAAGGCA GGTGTGGTTA GAGAACATCC CACTAACCCT AACCCTAACC

121 CTAACCCAAA CCCAAACTCA AACCAAAACC AATCTAGTGT TATACCCGCA GCTACGCAGC 181 AGCAGCTCTA GGTGTGTTT CAAGGAACTG GTGATCCTAC T TCCCCGGT CAGGCCATGA

241 GTGTAGGTGA CCCTTCAGGT TATGGTAAAA GGACAGGAGG AGGAGGAGGG TACCAGCAGG

301 CACCACCAGG GTTTGCTAT GGAGGTGGTG GTGGTGGGTT TGGAGGTGGT GGGCAACAAA

361 TGGGGATGGT GGGACCGTTA AGCCCTGTTT CATCAGACGG GTTAGGACAT GGACAAGTGG

The sequence SEQ ID NO that the TGGA GGTC of 421 ATAACATAGG AAGTCAGTAT GGAGTGGATA GGGAGGGTT AAGGGGAAGG AAAAGAGTAG 481 obtain 5 ' RACE:9, the sequence SEQ ID NO with acquisition:3 splicings, obtain SEQ ID NO: 10 :

1 GGGGGGGGGG CGGCGGTGAG ATCGCGGCTA GACAACCAAC TTTTGGGGAG ATGACGCTTG 61 AAGATTTCTT GGTCAAGGCA GGTGTGGTTA GAGAACATCC CACTAACCCT AACCCTAACC

121 CTAACCCAAA CCCAAACTCA AACCAAAACC AATCTAGTGT TATACCCGCA GCTACGCAGC

181 AGCAGCTCTA TGGTGTGTTT CAAGGAACTG GTGATCCTAC TTTCCCCGGT CAGGCCATGA

241 GTGTAGGTGA CCCTTCAGGT TATGGTAAAA GGACAGGAGG AGGAGGAGGG TACCAGCAGG

301 CACCACCAGG TGTTTGCTAT GGAGGTGGTG GTGGTGGGTT TGGAGGTGGT GGGCAACAAA 361 TGGGGATGGT GGGACCGTTA AGCCCTGTTT CATCAGACGG GTTAGGACAT GGACAAGTGG

421 ATAACATAGG AAGTCAGTAT GGAGTGGATA GGGAGGGTT AAGGGGAAGG AAAAGAGTAG

481 TGGA GGTCC AGTGGAGAAA GTAGTGGAAA GAAGGGAGAG GCGGATGATC AAGAACTGTG

541 AGTCTGCTGC AAGGTCTAGA GCAAGAAAGC AGGCGTATAC AGTGGAATTA GAAGCGGAAT

601 TGAACCAGTT GAAAGAAGAG AATGCGCAGC TAAAACATGC ATTGGGGGAG TTGGAGAGAA 661 AGAGGAAGCA ACAGTATTTT GAGACTTTGA AGACAAGAGC ACAACCGAAG T GCCGAAGG

721 CGAGGGGGAG ATTGCGGACA TTGATGAGGA ACCCGAGT G TCCGCTCTGA are according to SEQ ID NO:10 sequence retrievals are analyzed, SEQ ID NO:10 be 7) Z/P-$ full length sequence.

According to SEQ ID NO:10 sequences Design pair of primers are as follows： ThbZIP-4F ( SEQ ID NO: 1 1 ) ：

ATGACGCTTGAAGATTTCTTG

ThbZIP-4R ( SEQ ID NO: 12 ) ：

TCAGAGCGGACAACTCGGG

AP ( SEQ ID NO: 13 ) ：GGCCACGCGTCGACTAGTACTTTTTTTTTTTTTTTTT passes through SEQ ID NO:11 and SEQ ID NO:12 clone ThbZIP-4 complete encoding sequences.

Small salt mustard RNA is extracted, with primer SEQ ID NO:13 be reverse transcription primer, obtains the PfuUltra II Fusion HS DNA Polymerase that small salt mustard cDNA use Stratagene, performing PCR is entered using the cDNA of small salt mustard as template Reaction.50 μ PCR reaction systems：5 μ lO PfuUltra II reaction Buffer, 0.5 μ 25 mM dNTP, 2.0 μ cDNA, 1.0 μ PfuUltra II Fusion HS DNA Polymerase 10 μ Μ primer SEQ ID NO:11 and SEQ ID NO:12 each 2.0 μ 1, and 37.5 μ distilled water.PCR reaction conditions：95 °C of pre-degenerations 2 minutes, 35 circulations（95 °C are denatured 25 seconds, and 57 °C are annealed 25 seconds, and 72 °C extend 45 seconds）, 72 °C extend 5 minutes.

Pcr amplification product adds A tails：PCR primer moisturizing first takes out one time with chloroform and removes removing protein to 400 μ 1, draws supernatant and adds the μ 1 of 3 Μ sodium acetate solutions 40, plus 2 times of absolute ethyl alcohol, -20 °C are placed 10 minutes, centrifugation, supernatant is removed, is dried, is dissolved with 21 μ distilled waters.Add 2.5 μ Ι Ο χ Ε χ Buffer, 0.5 μ 5 mM dATP, 1.0 l Ex Taq.Reaction condition：70 °C are reacted 30 minutes.The DNA fragmentation for obtaining about 700bp is reclaimed（Omega QIAquick Gel Extraction Kits）, it is connected on pGEM T-easy carriers（Obtain 7) Z/P-$-pGEM plasmids）, JM109 is then converted, random 6 white colonies of picking are inoculated in the LB fluid nutrient mediums containing 50 g/mL ampicillins and cultivated respectively, and glycerol adding is to final concentration 20% after 37 °C of overnight incubations, and -80 °C save backup.With primer SEQ ID NO:11 and SEQ ID NO:12 carry out bacterium solution PCR amplifications（Reaction system and reaction condition are ibid）, 4 positive colonies are obtained, Invitrogen is delivered to（Shanghai）Trade Co., Ltd is sequenced, and sequence is SEQ ID NO:2, the amino acid sequence of its albumen encoded is SEQ ID NO:The amino acid sequence of 1 6Z/P-$ albumen（SEQ ID NO: 1 ) ：

1 MTLEDFLVKA GWREHP NP NPNPNENPNS NQNQSSVIPA ATQQQLYGVF QGTGDPTFPG

61 QAMSVGDPSG YGKRTGGGGG YQQAPPGVCY GGGGGGFGGG GQQMOVIVGPL SPVSSDGLGH

121 GQVDNIGSQY GVDMGGLRGR KRWDGPVEK WER QRR I KNRESAARSR AR QAYTVEL 181 EAELNQLKEE NAQLKHALGE LERKRKQQYF ESLK RAQPK LPKASGRLRT L RNPSCPL

The nucleotide sequence of 7 ^/^-$ encoding genes（SEQ ID NO: 2 ) ：

1 ATGACGCTTG AAGATTTCTT GGTCAAGGCA GGTGTGGTTA GAGAACATCC CACTAACCCT

61 AACCCTAACC CTAACCCAAA CCCAAACTCA AACCAAAACC AATCTAGTGT TATACCGGCA

121 GCTAGGCAGC AGCAGCTCTA TGGTGTGTTT CAAGGAACCG GTGATCCTAC T TCCCCGGT

181 CAGGCCATGA GTGTAGGTGA CCCTTCAGGT TATGGTAAAA GGACAGGAGG AGGAGGAGGG

241 TACCAGCAGG CACCACCAGG TGTTTGCTAT GGAGGTGGTG GTGG GGGTT TGGAGGTGGT

301 GGGCAACAAA GGGGA GGT GGGACCGTTA AGCCCTGTTT CATCAGACGG GTTAGGACAT

361 GGACAAGTGG ATAACATAGG AAGTCAGTAT GGAGTGGATA TGGGAGGGTT AAGGGGAAGG

421 AAAAGAGTAG GGATGGTCC AGTGGAGAAA GTAGTGGAAA GAAGGCAGAG GCGGA GATC

481 AAGAACCGTG AGTCTGCTGC AAGGTCTAGA GCAAGAAAGC AGGCGTATAC AGTGGAATTA

541 GAAGGGGAAT GAACCAGTT GAAAGAAGAG AATGCGCAGC TAAAACATGC ATTGGGGGAG

601 TTGGAGAGAA AGAGGAAGCA ACAGTAT TT GAGAGTTTGA AGACAAGAGC ACAACGGAAG

661 TTGCGGAAGG GGAGCGGGAG ATTGCGGACA TTGATGAGGA ACCCGAGT G TCCGCTCTGA embodiments 3 are because of plant expression vector construction

Plant binary expression vector pCAMBIA2300 is selected (to be purchased from Beijing DingGuo ChangSheng Biology Technology Co., Ltd）As plant expression vector, the 35S promoter that Ν Ρ Τ Π genes contain double enhancers is replaced with Pnos promoters, to reduce Ν Ρ Τ Π Expression of the albumen in plant.Selection contains 35S promoter and terminator the Tnos promoter and terminator respectively as ThbZIP-4 genes of double enhancers.

With primer SEQ ID NO:14 and SEQ ID NO:15 (are purchased from ocean Science and Technology Ltd. of Beijing China with plant expression vector pBI121）For template amplification Pnos, using TaKaRa PrimeSTAR HS archaeal dna polymerases.50 μ PCR reaction systems：10 μ 5 xPS Buffer, 3 μ 2.5 mM dNTP, 1.0 μ pBI121,1.0 μ PrimeSTAR, 10 μ Μ primer SEQ ID NO:14 standing grain P SEQ ID NO:15 each 2.0 μ 1, and 31 μ distilled water.PCR reaction conditions：94 °C of pre-degenerations 5 minutes, 33 circulations（94 °C are denatured 30 seconds, and 56 °C are annealed 30 seconds, and 72 °C extend 30 seconds）, 72 °C extend 10 minutes.PCAMBIA2300 (Promega, T4 ligase box) is connected to as the PCR products by obtained by after EcoRI, Bglll digestion and obtains pCAMBIA2300-l. SEQ ID NO: 14 ：

GCACGAATTCATACAAATGGACGAACGGAT SEQ ID NO: 15：

ATCCAGATCTAGATCCGGTGCAGATTATTTG

SEQ ID NO:16 standing grain P SEQ ID NO:17 using pBI121 as template amplification Tnos, using TaKaRa PrimeSTAR HS archaeal dna polymerases.50 μ PCR reaction systems：10 μ 5 xPS Buffer, 3 μ 2.5 mM dNTP, 1.0 μ pBI121,1.0 μ PrimeSTAR 10 μ Μ primer SEQ ID NO:16 standing grain mouthful SEQ ID NO:17 each 2.0 μ 1, and 31 μ distilled water.PCR reaction conditions：94 °C of pre-degenerations 5 minutes, (94 °C are denatured 30 seconds, and 58 °C are annealed 30 seconds, and 72 °C extend 30 seconds for 33 circulations）, 72 °C extend 10 minutes.PCAMBIA2300-1 (Promega T4 ligases box) is connected to as the PCR primer by obtained by after Sacl, EcoRI digestion and obtains pCAMBIA2300-2. SEQ ID NO: 16：

AAGGAGCTCGAATTTCCCCGATCGTTCAAA SEQ ID NO: 17：

TCAGAATTCCCAGTGAATTCCCGATCTAGTA

SEQ ID NO:18 and SEQ ID NO:19 using pCAMBIA2300 plasmids as template amplification arabidopsis 35S promoter.Using TaKaRa PrimeSTAR HS archaeal dna polymerases.50 μ PCR reaction systems：10 μ 5 xPS Buffer, 3 μ 2.5 mM dNTP, 1.0 μ dilute 50 times of pCAMBIA2300 plasmids, 1.0 μ PrimeSTAR, the 10 μ Μ ^^0 of 8 ￡ of primer 0 10:The ^ of 18 and 8 ￡ 0 10):19 each 2.0 ^, and 31 μ distilled water.PCR reaction conditions：94 °C of pre-degenerations 5 minutes, (94 °C are denatured 30 seconds, and 50 °C are annealed 30 seconds, and 72 °C extend 30 seconds for 33 circulations；), 72 °C extend 10 minutes.It is connected to as the PCR primer by obtained by after HindIII, Pstl digestion（Connection method is ibid）PCAMBIA2300-2 obtains pCAMBIA2300-3 SEQ ID NO: 18：

ACTAAGCTTATGGTGGAGCACGACACTCT SEQ ID NO: 19：

TGACTGCAGAGAGATAGATTTGTAGAGAGAGAC SEQ ID NO:20 and SEQ ID NO:(template is the positive that embodiment 2 is obtained to 21 amplification ThbZIP-4

ThbZIP-4-pGEM plasmids）, using stratagene PfuUltra II Fusion HS DNA Polymerase.50 μ PCR reaction systems：5 μ lO PfuUltra II reaction Buffer, 0.5 μ 1 25 mM dNTP, 2.0 μ ThbZIP-4-pGEM plasmids, 1.0 μ PfuUltra II Fusion HS DNA Polymerase, 10 μ Μ primer SEQ ID NO:20 standing grain P SEQ ID NO:21 each 2.0 μ 1, and 37.5 μ distilled water.PCR reaction conditions：95 °C of pre-degenerations 2 minutes, (95 °C are denatured 25 seconds, and 57 °C are annealed 25 seconds, and 72 °C extend 45 seconds, and 72 °C extend 5 minutes for 35 circulations.Connected as the PCR primer by obtained by after Pstl, Sad digestion（Connection method is ibid）To pCAMBIA2300-3, plant expression vector 35S-7 is obtained) Z/P-$-2300.

SEQ ID NO: 20：

AACTGCAGATGACGCTTGAAGATTTCTTG SEQ ID NO: 21：

The 35S-ThbZIP-4-23 expression vectors of AAGGAGCTC TCAGAGCGGACAACTCGGG embodiments 4 convert Agrobacterium

The preparation of Agrobacterium LBA4404 (being purchased from Biovector Science Lab, Inc) competent cell：Agrobacterium LBA4404 was drawn to single spot inoculation on the LB solid mediums containing 50 g/ml rifampins and 50 g/ml streptomysins in 1-2 days in advance, 28 °C are cultivated 1 to 2 day.Picking single bacterium colony is inoculated in 5 ml containing 50 μ_§The rifampins of/ι η 1 and 50 μ_§Overnight incubation (about 12-16 hours) is shaken in the LB fluid nutrient mediums of the streptomysins of/ι η 1, under 28 °C to OD_6(K)It is worth for 0.4, formation seed bacterium solution.Take the bacterium solution after 5 ml activation（1 :20 ratio）In the LB fluid nutrient mediums for being inoculated in the same concentration antibiotic of 100 ml, 28 °C of shakes cultivate 2-2.5 hours to OD_6(K)=0.8.Ice bath bacterium solution 10 minutes, shook up once every 3 minutes, made bacterium even into resting state.Centrifuged 10 minutes in 4000 g under 4 °C, abandon supernatant；Add 4000 g under 10% (v/v) glycerine resuspension thalline of 10 ml ice precoolings, 4 °C to centrifuge 10 minutes, collect precipitation；Ice-cold 10% (v/v) glycerine repeats to wash 3-4 times；Adding 10% (v/v) glycerine of 4 ml ice bath precoolings, suspended bacterial is precipitated again, is dispensed, is saved backup in -70 °C with 40 μ/pipe.

Convert Agrobacterium：Melt competent cell on ice, the positive 35S-7M of gained in 1 μ embodiments 3 added into 40 μ competent cell) Zff-$-2300 plasmids, ice bath about 10 minutes after mixing.The mixture of the competent cell and DNA is transferred in the electric shock of ice precooling cup with liquid-transfering gun, rapping makes suspension reach bottom, has been careful not to bubble. To be shocked by electricity cup（Purchased from Bio-Rad) it is put on the slideway of electroporation chamber, promote slideway to put electric shock cup to electroporation chamber base electrode.Using the electric shock cup of 0.1 cm specifications, MicroPuMUer (being purchased from Bio-Rad) program is set to " Agr ", and electric shock is once.Electric shock cup is taken out immediately, adds 1 ml LB culture mediums of 28 °C of preheatings.It is quickly soft to be beaten cell with liquid-transfering gun.Suspension is transferred to 1.5 ml centrifuge tube, under 28 °C, 225 rpm are cultivated 1 hour.100-200 μ bacterium solution is taken to be coated on corresponding resistance screening culture medium flat plate（LB solid mediums, containing 50 μ_§The rifampins of/ι η 1,50 μ_§The streptomysins of/ι η 1,50 μ_§The kanamycins of/ι η 1）, 28 °C of cultures.Positive transformants clone is screened, and its bacterium solution is saved backup in -70 °C.Embodiment 5 obtains transgenic arabidopsis using Agrobacterium-medialed transformation method

Plant culture to be transformed：Arabidopsis seed（Colombia's type, the arabidopsis Biological Resource Center from Ohio State Univ-Columbus USA）Sowing is in peat soil, after 4 °C of low-temperature treatments 3 days, is placed in 23 °C, germinates in the dark incubator in 16 hours illumination/8 hour.It is transplanted to after 7-10 days equipped with peat soil and vermiculite（Volume ratio 3:1) bore is in 7.5 cm polypots, every 6 plants of pot culture kind is placed in 23 °C, the dark incubator in 16 hours illumination/8 hour and grown.The ml of nutrient solution 40 is poured before transplanting per alms bowl, backsight soil moisture is transplanted and keeps the skin wet in time.In the appropriate nutrient solution of growth period.On demand per 3-4 weeks once（Or the time is longer）.In order to obtain more bud on each plant, first inflorescence is cut off after most of first inflorescence of plant are formed, apical dominance is released, promotes the synchronous appearance of multiple secondary inflorescences.When most of inflorescences about 1-10 cm are high（Cut off after first inflorescence 4-8 days）When prepare contaminate.

The culture of Agrobacterium：Take out after the bacterium liquid activation of Agrobacterium positive transformants clone of conservation in embodiment 4, picking Agrobacterium single bacterium colony is inoculated into the sterile LB fluid nutrient mediums of 10 mL（Containing 75 mg/ L rifampins, 100 mg/ L streptomysins and 100 mg/L kanamycins）, the lower 250 revs/min of shakings incubated overnight of 28 °C of constant temperature.Resulting bacterium solution is inoculated into the 200 mL equally LB fluid nutrient mediums containing above-mentioned antibiotic in 1%-2% (v/v) ratio again, 28 °C of constant temperature shakings make the concentration of Agrobacterium reach OD_6(K)=1.8, then centrifuged 15 minutes at 4 °C lower 3000 revs/min, with dip-dye culture medium after abandoning supernatant（The dip-dye culture medium contains 5.0% (w/v) sucrose and 0.05% (500 μ Ι Τ) Silwet L-77) suspend Agrobacterium again, is suspended into OD_6QQAbout 0.80.

The dip-dye of inflorescence：The above-mentioned dip-dye culture medium containing Agrobacterium is added in big mouth container, the dip-dye culture medium containing Agrobacterium described in 200-300 mL is added in each cm of bore 9 container to be used to contaminate.Plant is inverted, aerial tissues is fully immersed in agrobacterium suspension 3-5 seconds, and to be gently agitated for.There should be one layer of liquid film after infiltration on plant.The plant contaminated is placed in vinyl disc, with clean plastics or preservative film covering with moisturizing, is then placed within dim light or dark place is stayed overnight, note carefully preventing direct sunlight plant.Remove covering within about 12-24 hours after processing.Normal culture plant, the week of plant further growth 3-5, until silique browning is dried.Seed is harvested, and by seed centrifuge tube in 4 °C of lower dry storages.

Transgenic seed is screened:The aqueous solution containing 1/4 MS a great number of elements is prepared, 0.8 % agar powders is added, uses microwave stove heat Dissolved completely to agar, to be cooled to 50 °C or so, add the desired amount of final concentration of 50 η ^!/¹Kanamycins, per 25 mL are poured into culture dish after shaking up, putting can sow after experimental bench cooled and solidified.Load weighted seed is poured on a plain copying paper, use finger tap copy paper, seed is equably sowed on agaropectin, cover culture dish lid, after putting 4 °C of refrigerator cold treatments 72 hours, move to 23 °C, germinate in the dark incubator in 16 hours illumination/8 hour, resistance seedling is transplanted in Nutrition Soil by periodic statistical germination and growth of seedling situation in time.Backsight soil moisture is transplanted to keep the skin wet in time.In the appropriate nutrient solution of growth period.The g of Arabidopsis leaf 0.1 of growth 20 days is taken, DNA is extracted, with SEQ ID NO:11 and SEQ ID NO:12 amplification ThbZIP-4:(50 μ PCR reaction systems：5 μ Ι Ο Ε χ Buffer, 3 μ 2.5 mM dNTP, 2.0 μ DNA, 1.0 μ Ex Taq, 10 μ Μ primer SEQ ID NO:11 and SEQ ID NO:12 each 2.0 μ 1, and 35 μ distilled water.PCR reaction conditions：94 °C of pre-degenerations 5 minutes, 33 circulations（94 °C are denatured 45 seconds, and 57 °C are annealed 45 seconds, and 72 °C extend 1 minute）, 72 °C extend 7 minutes）, the PCR plant for being accredited as the positive are numbered（), T1A1-T1A12 and preserve.Embodiment 6 is overexpressed the sterilized vermiculite of drought-enduring simulated experiments and Function Identification of the ThbZIP-4 transgenic arabidopsis T1 for plant and is impregnated with 1/2MS culture mediums.T1A1-T1A6 and control arabidopsis seed are sowed on vermiculite respectively, 10 seeds are sowed per basin, 25 °C, optical culture/14 hour light culture circulation in 10 hours, pour a 1/2MS within every 7 days, after culture 20 days, per 4-5 more consistent seedling of basin reservation size, for arid experiment.Transgenic arabidopsis, control arabidopsis arid 14 days（Do not water), 25 °C, optical culture/14 hour light culture circulation in 10 hours.T1 is for transfer-gen plant（The plant that T0 grows up to for the seed of transfer-gen plant）Identification of Drought show that adjoining tree is all wilted seriously, and six strains of T1A1, T1 A2, T1A3, T1A4, T1A5, T1A6 are totally 24 (per each 4-5 of strain）21 can survive and continued growth shows obvious drought tolerance in arabidopsis（Referring to Fig. 3 a and 3b, by taking T1A2 as an example, T1A1, T1A3, T1A4, TIC 5, T1A6 result it is similar with T1A3, be not shown here）.The measure that ABA changes after the drought stress of embodiment 7

ABA is a generally acknowledged Plant Hormone related to environment stress, the expression of multiple adversity inducible genes can be regulated and controled as signaling molecule, so as to improve the anti-adversity ability of plant.We take the transfer-gen plant under drought stress 10 days and normal growing conditions（T1A1, T1A2, T1A3, T1A4, T1A5, T1A6) and adjoining tree（CK) each 0.2 g of blade or so, with Abscisic Acid (ABA) enzyme linked immunological（ELISA) kit (being purchased from Shanghai Rui Gu bio tech ltd) determines ABA contents（See Fig. 4).Test result indicates that, no matter under Osmotic treatment or collating condition, the ABA contents of transfer-gen plant are above control（CK1, CK2), prove Γ) Ζ/Ρ-$ genes can just regulate and control plant endogenous ABA contents.Embodiment 8 verifies Γ Ζ/Ρ-$ protein expressions on transcriptional level Control Arabidopsis plant, drought-enduring transgenic arabidopsis Tl are taken respectively for plant（It is belonging respectively to six strains of T1A1, T1A2, T1A3, Tl A4, Tl A5, T1A6）Not drought-enduring transgenic arabidopsis T1 uses plant RNA extraction kit for each 0.05 g of the arid blade of 10 days of plant（Invitrogen) the total serum IgE extracted.Total serum IgE is determined in 260 nm and 280 nm absorbance with the ultraviolet specrophotometer U-2001 of HITACHI companies, calculates each RNA concentration.Trying the reverse transcription of method progress shown in neat Ll boxes Superscript III Reverse Transcriptase according to Invitrogen reverse transcriptions, (2 μ g total serum IgEs are used as template, reverse transcription primer SEQ ID NO: 13 ).Pass through SEQ ID NO:11 and SEQ ID NO:12 amplifications

ThbZIP-4, detects mp-4 albumen relative expression's situations.

Using TaKaRa PrimeSTAR HS archaeal dna polymerases, performing PCR reaction is entered by template of the cDNA of reverse transcription.The Ρ Ο reaction systems of 50 μ 1：10 μ 5 xPS Buffer, 3 μ 2.5 mM dNTP, 2.0 μ cDNA, 1.0 l PrimeSTAR, 10 μ Μ primer SEQ ID NO:16 standing grain Ρ SEQ ID NO:17 each 2.0 μ 1, and 30 μ distilled water.PCR reaction conditions：94 °C of pre-degenerations 5 minutes, 29 circulations（94 °C are denatured 45 seconds, and 57 °C are annealed 45 seconds, and 72 °C extend 1 minute）, 72 °C extend 10 minutes.

Product electrophoresis result is as shown in Figure 5：M is DNA Ladder Marker (DL2000, TakaRa), and the drought-enduring transgenic arabidopsis T1 of 1-7 are for plant（It is followed successively by：T1A1, T 1A2, T1A3, T1A4, T1A5, T1A6, T1A7), 8-1 1 compares for non-transgenic arabidopsis；12-16 is not drought-enduring transgenic arabidopsis Tl for plant.The electrophoretic bands of PCR products shown in figure size is in the same size with Γ Ζ/Ρ-$'s（About 720 bp).As a result show, control arabidopsis does not have ThbZIP-4 transcriptions, drought-enduring transgenic arabidopsis T1 is for 7) Z/P-$ transcription is stronger in plant, and not drought-enduring transgenic arabidopsis T1 is transcribed very weak or do not transcribed for plant.

Claims

Claims

1. a kind of leucine zipper protein of small salt mustard, its sequence is SEQ ID N0: 1.

2. encode SEQ ID NO:The gene of 1 leucine zipper protein, preferably its sequence are SEQ ID NO: 2.3. a kind of recombinant expression carrier, it contains the gene described in claim 2, and the nucleotide sequence of the gene is operably connected with the expression control sequence of the carrier is carrier for building the recombinant expression carrier；Preferably, the carrier is carrier is pCAMBIA2300.

4. the recombinant expression carrier described in claim 3, it is the 35S-7 shown in accompanying drawing 2) Z/P-$-2300 carriers.

5. a kind of recombinant cell, it contains the recombinant expression carrier described in gene or claim 3 or 4 described in claim 2；Preferably, the recombinant cell is restructuring agrobatcerium cell.

6. a kind of method of improvement drought resistance in plants, including：Recombinant expression carrier described in gene or claim 3 or 4 described in claim 2 is imported into plant or plant tissue and makes the gene expression；Preferably, the plant is arabidopsis.

7. a kind of method of prepare transgenosis plant, including：The plant containing the recombinant expression carrier described in the gene or claim 3 or 4 described in claim 2 or plant tissue are cultivated under conditions of plant is effectively produced.

8. the method described in claim 7, wherein the plant is arabidopsis.

9. the recombinant expression carrier described in gene, claim 3 or 4 described in claim 2 or the recombinant cell described in claim 4 are used to improve drought resistance in plants and the purposes for plant breeding.

10. the purposes described in claim 9, wherein the plant is arabidopsis.