CN101429510B - Wheat hpfw gene, expression product and uses thereof - Google Patents

Abstract

The invention relates to a wheat hpfw gene, an expression product and application thereof which belong to the technical field of agricultural biology, and are used for preventing plant disease and pests, improving plant growth and crop yield. The rice hpfr gene has a gene sequence with functions similar to those of plant pathogenetic bacteria hrp gene in plant, which is discovered for the first time; and a coded product has functions of exciton, such as generating anaphylactic reaction on tobacco, inducing plant to generate disease resistance, improving plant growth, improving crop yield and the like; as the hpfr gene originates from plant, and the expression product hpfr protein is generated through expressing vector with high efficiency and microbial fermentation, the gene and the expression product are economic and environment-friendly biological pesticide, and can be used for preventing and treating plant disease and pests in land and sheltered land and improving the yield. The invention also provides the wheat hpfw gene, wherein an expression product hpfw protein of the gene has the functions of inducing tobacco to generate anaphylactic reaction, exciting plant to generate resistance, and promoting plant growth.

Description

Wheat hpfw gene, expression product and application thereof

The application is the applying date: on February 14th, 2007, application number: 200710020342.X, title: the dividing an application of paddy hpfr gene, expression product and application thereof.

One, technical field

The present invention relates to paddy hpfr gene, expression product and uses thereof, belong to agricultural biological technical field, be used to prevent and treat plant pest, promote plant-growth and improve crop yield.

Two, background technology

The hrp gene is that decision excites anaphylaxis (hypersensitiveresponse in the plant pathogenetic bacteria on non-host plant, HR) pathogenic gene [Lindgren P B and on host plant, The role of hrp genes duringplant-bacterial interaction.Annu Rev Phytopathol, 1997,35:129～152].Anaphylaxis is a kind of partial, cell programming fast dead (programmed cell death, the PCD) form that plant produces.PCD can cause one or more signal transduction paths, gives plant multiple anti-environment-stress ability.

The hrp gene of plant pathogenetic bacteria has been done more detailed research both at home and abroad.People such as Wei find that first a kind of new protein of the hrpN genes encoding of erwinia amylovora Erwinia amylovora can produce anaphylaxis by inducing plant, and with its called after Harpin.These proteinic characteristics are to be rich in glycine and to lack halfcystine, thermally-stabilised, have inducing plant and produce biological activity [Wei Z M such as anaphylaxis, inducing anti-disease and promotion plant growth, Laby R J, Zumoff C H, et al.Harpin, elicitor of the hypersensitive response produced by the plant pathogen Erwinia amylovora.Science, 1992.257:85～88].Now from various plants pathogenetic bacterias such as pseudomonas syringae Pseudomonas syringae and Xanthomonas campestris Xanthomonasoryzae, identify successively and have the active protein of harpin.They are by specific hrp genes encoding in the corresponding plant pathogenetic bacteria hrp gene cluster.

Hear big firm grade and from rice leaf spot bacteria X.oryzae pv.oryzae, cloned the hrp gene, be i.e. hrfA _XooGene, this gene nucleotide series size is 420bp, coded product harpin _XooMolecular weight is 15.6kD, and this protein has the function of harpins: the injection tobacco can produce anaphylaxis by inducing plant; Handle plant in external spraying and can produce [Wen Weigang, Shao Min, Chen Gongyou such as resistance and promotion plant growth by inducing plant, Wang Jinsheng, the defense response of bacterial blight of rice protein exciton inducing plant. Journal of Agricultural Biotechnology, 2003,11 (2): 192～197].Express this proteinic engineering strain and carried out study on the industrialization and exploitation, national patent protection [patent No.: ZJ00135403.5] has been applied in relevant research; With hrfA _XooThe gene transformation paddy rice has and improves resistance [Shao Min, Wang Jinsheng, the commentaries on classics hrfA of paddy rice to rice blast, bacterial leaf-blight _XooTrans-genetic hybrid rice is to the resistance of bacterial leaf-blight, Agricultural University Of Nanjing's journal 2004,27 (4): 36-40], correlative study has been subjected to national patent protection [patent No.: ZL 02157213.5].Therefore, hrp gene in the plant pathogenetic bacteria and applied research thereof get more, but are similar to the harpin encoding gene in the plant and applied research does not have report so far as yet.

Three, summary of the invention

Technical problem the purpose of this invention is to provide hpfr gene in the paddy rice, expression product and uses thereof.The hpfr expression of gene product that comes from paddy rice, controlling plant diseases, promotion plant growth.

Technical scheme gene provided by the present invention has following feature:

1. paddy hpfr gene is originated:

Design primer: 5 '-GGAATTCCATATGAACTCTTTGAACACACAATTGG-3 ' and 5 '-CGGGATCCTATTACTGCATTGATGCGCTTCC-3 ' amplifies this fragment with PCR method from paddy rice.This gene fragment called after hpfr gene (Fig. 1).With the hpfr gene is probe, and with the total DNA hybridization of rice genome, results of hybridization shows that hybridization positive signal (Fig. 2) is arranged in rice genome.

2. the nucleotides sequence of the nucleotide sequence paddy hpfr gene of paddy hpfr gene is classified SEQ ID NO.1 (Fig. 3) as: determine that this gene size is 405bp, there is EcoRI restriction enzyme site GAATTC in the initiator codon place, coding region is rich in GGT or GGC shows coding glycine (glycine, G) codon (shadow zone) has 4 GGCGGC repeat regions (square frame district).ATG shows initiator codon, and TAA shows terminator.

3. the derivation aminoacid sequence of the derivation aminoacid sequence paddy hpfr gene of paddy hpfr gene coding coding is SEQ IDNO.2 (Fig. 4), is 134 amino acid according to the nucleotide sequence deduced amino acid of hpfr gene.Be rich in glycine (shadow zone), do not contain cysteine.

4. the paddy hpfr gene vivoexpression is implemented in the outer efficient expression vector pET30a (+) of aleuroplast with paddy hpfr gene and forms recombinant plasmid pETR (Fig. 5), produce the vivoexpression product of paddy hpfr gene, called after hpfr protein, its feature class is similar to harpin _XooFunction: can induce the non-host plant tobacco in 24 hours, produce anaphylaxis (Fig. 6), wetting ability, to thermostability, to proteolytic enzyme susceptibility, through the SDS-PAGE electrophoresis, determine that this proteinic molecular weight is about 14.5kD (Fig. 7).

5. the proteinic physicochemical property of paddy hpfr

Hpfr protein still can excite tobacco to produce anaphylaxis in 24h behind 100 ℃ of water-bath 10min, and activity does not significantly descend yet; With then having completely lost the anaphylactoid ability that excites behind the protease hydrolysis 30min, this shows that hpfr protein is thermally-stabilised, but to the proteolytic enzyme sensitivity.

6. the application of the expression product of paddy hpfr gene

The expression product hpfr protein of paddy hpfr gene is mixed with proper concn, is used for the crop foliage-spray in the various seasons of crop, also can be used for soaking root when crop is transplanted and handle, and controlling plant diseases, promotes plant growth.7. derive from homologous sequence hpfx gene plant and above-mentioned paddy hpfr gene, it is characterized in that, use paddy hpfr gene primer: 5 '-GGAATTCCATATGAACTCTTTGAACACACAATTGG-3 ' and 5 '-CGGGATCCTATTACTGCATTGATGCGCTTCC-3 ', genomic dna with plant is a template, amplify the hpfx gene with PCR method, pcr amplification condition: 1 circulation of 94 ℃/5min, 35 circulations of 94 ℃/45sec+60 ℃/45sec+72 ℃/45sec, 1 circulation of 72 ℃/7min; The hpfx gene encoding production has evoking tobacco and produces the anaphylaxis reaction, excites plant to produce resistance and promote the plant-growth function.The product of hpfx coded by said gene is a hpfx protein.

8, derive from homologous sequence hpfw gene wheat and paddy hpfr gene, its sequence is SEQ ID NO.3, its deduced amino acid is SEQ ID NO.4, and hpfw gene encoding production hpfw protein has evoking tobacco and produces anaphylaxis, excites plant to produce resistance and promote the plant-growth function.

Beneficial effect

The inventor is with hrfA _Xoo[Shao Min, Wang Jinsheng change hrfA to the gene transformation paddy rice _XooTrans-genetic hybrid rice is to the resistance of bacterial leaf-blight, Agricultural University Of Nanjing's journal, 2004,27 (4): 36-40], when the transgenic paddy rice Molecular Detection, find to exist and hrfA in the paddy rice _XooThe dna homolog sequence, and with its clone with at vivoexpression, its expression product has evoking tobacco and produces anaphylaxis, excites plant to produce functions such as resistance and promotion plant-growth, finds that in plant being similar to the harpin encoding gene still belongs to the first time.

The present invention be in the paddy rice with the hrp dna homolog sequence of rice leaf spot bacteria (X.oryzae pv.oryzae), expression product and uses thereof, derive from the hrp dna homolog sequence expression product of paddy rice and the coded product harpin of rice Xanthomonas hrp gene _XooSimilar function is arranged, so be hpfr (hrp-like function loci in rice) gene with this unnamed gene.This gene size is 405bp.

The present invention discovers that the hpfr gene has similar function at external expression product to the hrp gene expression product of rice Xanthomonas, promptly promote plant-growth, inducing anti-disease worm property etc., the present invention has cloned the hpfr gene from paddy rice, and builds up in the expression vector, obtains expression product.

Result of study shows that hpfr protein is handled the ability (Fig. 8) that tobacco has the anti-TMV of obvious evoking tobacco.Tomato, capsicum growing way that hpfr protein is handled obviously are better than be untreated (Fig. 9), the collecting period in advance 1 all left and right sides hpfr protein handle the tomato yield ratio and be untreated and improve 40.3%, capsicum improves 31.6%.(Figure 10) takes place obviously to alleviate in virus disease on the tomato.

Handle tomato with the spraying of hpfw protein, have the plant-growth function (Figure 14) of promotion, simultaneously, obviously reduce the generation of early blight of tomato; Handle cucumber with this protein spraying, cucumber downy mildew is had better prevention effect (table 2).

Four, description of drawings

Fig. 1 paddy hpfr gene pcr amplification electrophorogram

Fig. 2 paddy hpfr gene is the total DNA results of hybridization of probe and rice genome

M-Marker, hplr-hplr gene masculine contrast, 1,2, the total DNA of 3-rice genome

The nucleotide sequence SEQ ID NO.1 of Fig. 3 paddy hpfr gene

Fig. 4 paddy hpfr gene derivation aminoacid sequence SEQ ID NO.2

Fig. 5 paddy hpfr gene is implemented in pET30a (+) and goes up restriction enzyme digestion and electrophoresis figure

Fig. 6 paddy hpfr protein induce tobacco produces anaphylaxis

The crude protein extract of A-BL21 (DE3)/pETR,

The crude protein extract C-H of B-BL21 (DE3)/pET30 (a) ₂O

Fig. 7 paddy hpfr protein s DS-PAGE electrophorogram

M-Marker, the CFEP that 1.BL21 (DE3)/pETR extracts, 2. the paddy hpfr protein of purifying

Fig. 8 BL21 (DE3)/pETR expresses the anti-TMV of paddy hpfr protein induce tobacco

Fig. 9 paddy hpfr protein foliage-spray tomato, capsicum promote growth

Figure 10 paddy hpfr protein foliage-spray tomato alleviates virus disease and takes place

The nucleotides sequence of Figure 11 wheat hpfw gene is classified SEQ ID NO.3 as

Figure 12 wheat hpfw gene derivation aminoacid sequence SEQ ID NO.4

Figure 13 wheat hpfw protein s DS-PAGE electrophorogram

Figure 14 wheat hpfw protein induce tobacco produces anaphylaxis

The crude protein extract of A-BL21 (DE3)/pETW,

The crude protein extract C-H of B-BL2I (DE3)/pET30 (a) ₂O

Figure 15 wheat hpfw protein foliage-spray tomato promotes growth

Five, embodiment

Embodiment 1

1. the discovery of paddy hpfr gene designs the paddy hpfr gene primer with the clone according to the pathogenic mutation hrfAXoo gene open reading frame of rice Xanthomonas bacterial leaf-blight:

5 '-GGAATTCCATATGAACTCTTTGAACACACAATTGG-3 ' and 5 '-CGGGATCCTATTACTGCATTGATGCGCTTCC-3 ' amplifies from paddy rice with PCR method and to derive from hpfr gene in the paddy rice.Pcr amplification condition: 1 circulation of 94 ℃/5min, 35 circulations of 94 ℃/45sec+60 ℃/45sec+72 ℃/45sec, 1 circulation of 72 ℃/7min.With this gene fragment called after hpfr gene (Fig. 1).With the paddy hpfr gene is probe, and with the total DNA hybridization of rice genome, results of hybridization shows that hybridization positive signal (Fig. 2) is arranged in rice genome.

2. the vivoexpression of paddy hpfr gene

The PCR product purification is connected on the expression vector pET30a (+) after NdeI and BamHI enzyme are cut, and obtaining recombinant plasmid is pETR[pET30a (+) ∷ hpfr] (Fig. 5).With pETR transformed into escherichia coli BL21 (DE3), obtain recombinant microorganism BLTR[BL21 (DE3)/pET30a (+) ∷ hpfr], 37 ℃ of following shaking culture 12h in the LB+Km20 μ g/ml of single colony inoculation 20ml of recombinant microorganism BLTR, 37 ℃ of following shaking culture 3h in the LB+Km20 of 20ml μ g/ml transfer, the IPTG (TaKaRa company) of 1M is added wherein, making its final concentration is 1mM, continues to cultivate 2h.It is centrifugal that (5000rpm 10min) collects thalline.Thalline boils 10min in 100 ℃ of water-baths, and the cooling back is centrifugal, and (12000rpm, 10min), (Cell-free Elicitor Protein CFEP), in the injection tobacco leaf mesophyll tissue cell, produces anaphylaxis (Fig. 6) in the 24h to get supernatant.Get supernatant liquor 3 μ l and carry out the 12%SDS-PAGE electrophoresis, calculate that according to the molecular weight of standard protein the proteinic molecular weight of paddy hpfr is about 14.5kD (Fig. 7).

3. subtotal amount in laboratory is produced paddy hpfr protein

With 37 ℃ of following shaking culture 12h among the LB+Km20 μ g/ml of single colony inoculation 20ml of recombinant microorganism BLTR9, transfer in the fermentation of corn starch substratum (monosodium glutamate 1% of 5L, yeast extract paste 1%, Semen Maydis powder 3.5%)+Km20 μ g/ml in 37 ℃ of bottom fermentations cultivate 3h, add lactose (final concentration is 10mM) inducing culture 2h.It is centrifugal that (5000rpm 10min) collects thalline.Thalline boils 10min in 100 ℃ of water-baths, and the cooling back is centrifugal, and (12000rpm 10min), gets supernatant, is paddy hpfr protein.1L fermentation of corn starch substratum approximately can produce 1.5g hpfr protein.

The proteinic direct use of embodiment 2 paddy hpfr gene expression product hpfr

The expression product hpfr protein of paddy hpfr gene carries out foliage spray by the concentration of 15,30,60 μ g/ml to plant.

1. induce the resistant phenotype of Xanthi tobacco to TMV

With paddy hpfr and harpin _XooIt is 15,30,60 μ g/ml that proteinic CFEP mother liquor is diluted to concentration respectively, sprays into strain phase coral west cigarette, 5 repetitions of every processing with micro-sprayer; Behind the 16h, use frictional inoculation activated T MV on tobacco leaf; Observed result after 4 days, and statistics scab number.Result of study shows, paddy hpfr and harpin _XooHandle tobacco, the ability (minimizing on the withered spot number order) that the anti-TMV of obvious evoking tobacco all arranged (Fig. 8).Analyze (F through LSD method multiple comparisons _189.464) show BL21 (DE3)/pETR and BL21 (DE3)/pET30a (+) ∷ hrfA _XooThe protein extract handle with pET30 (a)/BL21 (DE3) protein extract contrast and compare difference extremely remarkable (table 1).Inducing anti-disease most pronounced effects when concentration is 60 μ L/mL, the proteinic preventive effect of paddy hpfr is 96.35%, with harpin _XooPreventive effect (95.9%) is close.

2. promotion plant-growth improves output

It is 60 μ g/ml that paddy hpfr protein C FEP mother liquor is diluted to concentration; At tomato, capsicum booth, spray in seedling stage, florescence and setting phase respectively, result of study shows that the tomato of processing, capsicum growing way obviously are better than be untreated (Fig. 9), collecting period in advance 1 all left and right sides paddy hpfr protein handle the tomato yield ratio and be untreated and improve 40.3%, capsicum improves 31.6%.(Figure 10) takes place obviously to alleviate in virus disease on the tomato.

Table 1 BL21 (DE3)/pETR9 expresses the effect of the anti-TMV of paddy hpfr protein induce tobacco

^*: the significance of difference on P＜0.01 level

Derive from and plant unify called after hpfx gene with homologous sequence above-mentioned paddy hpfr gene, it is characterized in that, with embodiment 1 paddy hpfr gene primer, genomic dna with plant is a template, (method is with embodiment 1) amplifies the hpfx gene with PCR method, and its coded product has evoking tobacco and produces anaphylaxis, excites plant to produce resistance and promote the plant-growth function.The product of hpfx coded by said gene is unified called after hpfx protein.

Following embodiment is an example with the wheat, and acquisition is hpfw with paddy hpfr gene homologous gene from wheat, and expression product is a hpfw protein.

In embodiment 3 wheats with paddy hpfr gene homology hpfw gene cloning and expression

1. wheat hpfw gene clone and nucleotide sequence are with designing primer:

5 '-GGAATTCCATATGAACTCTTTGAACACACAATTGG-3 ' and 5 '-CGGGATCCTATTACTGCATTGATGCGCTTCC-3 ', from wheat, increase and the paddy hpfr gene homologous gene called after hpfw gene with PCR method (method is with embodiment 1).The nucleotides sequence of hpfw gene is classified SEQ ID NO.3 (Figure 11) as, and size is 414bp, with the homology of paddy hpfr gene be 93%.Hpfw gene derivation aminoacid sequence is SEQ ID NO.4 (Figure 12).

2. wheat hpfw gene in vitro is expressed and subtotal amount production hpfw protein (method is with embodiment 1)

Wheat hpfw gene is connected on the expression vector pET30a (+), obtains recombinant expression vector pETW9[pET30a (+):: hpfw], by e. coli bl21 (DE3) expressed products, called after hpfw protein.This calculates that according to the molecular weight of standard protein the proteinic molecular weight of wheat hpfw is about 14.8kD (Figure 13) through the 12%SDS-PAGE electrophoresis.

3. the proteinic biological activity of wheat hpfw

In the wheat hpfw protein injection tobacco leaf mesophyll tissue cell, excite tobacco to produce anaphylaxis (Figure 14) in the 24h; Handle tomato with this protein spraying, the result shows that this protein has the plant-growth function (Figure 15) of promotion, simultaneously, obviously reduces the generation of early blight of tomato; Handle cucumber with this protein spraying, cucumber downy mildew is had better prevention effect (table 2).

Table 2. wheat hpfw protein to the prevention effect of crop pest (relative control effect, %)

Sequence table

＜110〉Agricultural University Of Nanjing

＜120〉paddy hpfr gene, expression product and application thereof

＜130〉specification sheets

<140>00

<141>2007-02-05

<160>6

<170>PatentIn?version3.1

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<211>405

<212>DNA

＜213〉Oryza sativa (paddy rice)

<220>

<221>gene

<222>(1)..(405)

<223>

<400>1

<210>2

<211>134

<212>PRT

＜213〉Oryza sativa (paddy rice)

<220>

＜221〉aminoacid sequence of paddy hpfr gene expression

<222>(1)..(134)

＜223〉be rich in the glycosides propylhomoserin

<400>2

<210>3

<211>414

<212>DNA

＜213〉wheat (Triticum aestivum)

<220>

＜221〉wheat hpfw gene

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<223>

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<210>4

<211>137

<212>PRT

＜213〉wheat (Triticum aestivum)

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＜221〉wheat hpfw amino acid

<222>(1)..(137)

<223>

<400>4

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<211>33

<212>DNA

＜213〉synthetic

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＜221〉paddy hpfr gene primer left sided sequence

<222>(1)..(33)

<223>

<400>5

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<212>DNA

＜213〉synthetic

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＜221〉paddy hpfr gene primer right side sequence

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Claims (3)

1. wheat hpfw gene, its sequence is SEQ ID NO.3.

2. the protein of the described wheat hpfw of claim 1 genes encoding, its aminoacid sequence is SEQ ID NO.4.

3. the application of the protein of the described wheat hpfw of claim 2 genes encoding aspect controlling plant diseases, promotion plant growth.

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