CN106244625A - A kind of agriculture bacillus mediated tobacco seed genetic transforming method rapidly and efficiently - Google Patents

A kind of agriculture bacillus mediated tobacco seed genetic transforming method rapidly and efficiently Download PDF

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CN106244625A
CN106244625A CN201610877696.5A CN201610877696A CN106244625A CN 106244625 A CN106244625 A CN 106244625A CN 201610877696 A CN201610877696 A CN 201610877696A CN 106244625 A CN106244625 A CN 106244625A
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赵德刚
张祎
秦利军
赵丹
杜致辉
祖庆学
余婧
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Guizhou University
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    • C12N15/8202Methods for introducing genetic material into plant cells, e.g. DNA, RNA, stable or transient incorporation, tissue culture methods adapted for transformation by biological means, e.g. cell mediated or natural vector
    • C12N15/8205Agrobacterium mediated transformation

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Abstract

The present invention discloses a kind of agriculture bacillus mediated tobacco seed genetic transforming method rapidly and efficiently.The key step of the method includes: ripe tobacco seed is used as genetic transformation material after appropriateness is ground, adjust Agrobacterium bacterial concentration to appropriate value for infecting acceptor material, successively through co-culturing, sowing, GUS histochemical stain and PCR amplification after, identify transgenic tobacco plant.The inventive method without carrying out disinfection, the step such as sterilizing and tissue culture, and major part operating process is without aseptically carrying out, avoid the shortcoming such as loaded down with trivial details, time-consuming brought due to aseptic and group training operation, it is a kind of simple, quick, low cost, repeatability preferably genetic transforming method, quickly initiative transgene tobacco new germ plasm is had great importance and is worth.

Description

A kind of agriculture bacillus mediated tobacco seed genetic transforming method rapidly and efficiently
Technical field
The invention belongs to agricultural biological technical field and plant genetic engineering field, a kind of agriculture bacillus mediated cigarette Grass seed method for transformation.
Background technology
Nicotiana tabacum L. is the crop that a kind of economic worth is higher, occupies huge economic market in China.Nicotiana tabacum L. is except being mainly used in Suck, albumen edible and medicinal outside, also there is relatively broad purposes.Along with the development of plant subject, grind based on Nicotiana tabacum L. Model plant in studying carefully and applying has played important at aspects such as plant genetic, growth, Physiology and biochemistry and secondary metabolism researchs Effect.Although China's tobacco planting area and yield all rank first in the world, but Nicotiana tabacum L. is the economy that a kind of yield and quality is laid equal stress on Crop, the factor such as Different climate condition, pest and disease damage all can have a strong impact on the quality of the growth of cigarette strain, Nicotiana tabacum L., in turn results in greatly Economic loss.So the requirement that cigarette quality is improved by people is more and more urgent, conventional smoke grass crossing breeding cycle length, take effect Slowly, there is the phenomenon that unfavorable character gene is chain simultaneously, have a strong impact on new product of tobacco cultivation.At present, genetic engineering is used It is one of the most efficient breeding mode that technology obtains new product of tobacco.
Since 1984 obtain transgene tobacco first, including particle bombardment, electric shocking method, PEG method, pollen tube channel Method and the multiple genetic transforming method such as agriculture bacillus mediated have been successfully applied to the initiative of Nicotiana tabacum L. new germ plasm.But PEG method and electric shocking method Needing by means of plant protoplast culture technique, operation easier is relatively big and plant protoplast may be spontaneous by hormonal action Merge and produce somatic variation;Although particle bombardment is simple to operate, but economic drain is big, there is exogenous gene and easily loses and sink Silent phenomenon, the shortcoming such as transgenic progeny easily sudden change;It addition, pollen tube passage method is big by the influence of change of environmental condition, repeatability Bad, empirical too strong, conversion ratio is on the low side and obtains the shortcomings such as plant late detection difficulty.At present, Agrobacterium is utilized to infect cigarette It is to study the most deep, the most ripe genetic transforming method that blade of grass sheet obtains transgene tobacco, and it has conversion ratio height, low cost etc. Advantage, but the method must require strict by tissue culture and Regeneration Ways in operating process, time and effort consuming, work Amount is big, vitrification, brownization easily occurs in group training material successive transfer culture.So setting up one to be independent of plant tissue culture technique Nicotiana tabacum L. genetic transforming method significant.
Agrobacterium is the gram negative bacteria being widely present in a kind of soil.Research finds, after plant sustains damage, and agriculture bar Bacterium can infect most of dicotyledon and part monocotyledon, and plant injury will produce a species specific biology Alkali crown gall alkali (opines), enters in agrobatcerium cell, causes the processing of T-DNA, enters plant cell and is incorporated into cell On Matrix attachment region.If inserted in the suitable agrobatcerium T-DNA built by genes of interest, exogenous gene will be along with T-DNA Insert in Plant Genome, and along with the Differentiation of plant cell, produce transfer-gen plant.The Nicotiana tabacum L. of agrobacterium-mediated transformation is lost The acceptor material that biography Study on Transformation is used generally includes blade, embryo callus etc..The difference of these material source plants Growth and development stage, has spatio-temporal difference, need to take different conversion and cultural method for different materials, operate Journey is relatively complicated, in order to improve transformation efficiency, it is thus achieved that new tobacco bred, it should use ideal genetic transformation material, It should have the advantage that first, and material processing mode is relatively uniform, has high duplication and universality;Second, material breaks up Degree is low, and cellular omnipotency is strong, has the probability developing into whole plant;3rd, material easily obtains, and reduces and draws materials to reality The impact tested, it is simple to test;4th, material quantity is relatively large, beneficially genetic transformation success.Due to tobacco seed subnumber Amount is relatively big, and material is homogeneous, and repeatability is high, and easily obtains, and easily preserves, and cellular omnipotency is strong, is by Nicotiana tabacum L. Study on Genetic Transformation Ideal material.Tradition Nicotiana tabacum L. Agrobacterium genetic transformation generally requires by plant tissue culture technique, and outer implant Sterilization is one of key factor, and disinfecting time is too short, the easy microbiological contamination of tissue culture procedures;Overlong time, disinfecting substance can kill Plant cell, affects group training effect.Therefore, a Nicotiana tabacum L. genetic transforming method being independent of tissue culture is set up for initiative cigarette Grass new germ plasm is particularly important.
Summary of the invention
For the demand in above-mentioned field, the invention provides one and grow tobacco genetic transforming method, thus avoid tradition Shortcoming in Nicotiana tabacum L. genetic transforming method is loaded down with trivial details including plant tissue culture technique, it is desirable to stringent asepsis requirements, in incubation Growth cycle is long, more high to the conditions dictate of material, establishes the something lost of a kind of efficient quick agriculture bacillus mediated tobacco seed Pass method for transformation.
The most agriculture bacillus mediated a kind of tobacco seed genetic transforming method, employing following steps:
1) choosing full seed is experiment material, destroys seed coat thus its embryo exposed with grinding pestle grinding seed;
2) adjustment engineering Agrobacterium bacterium solution containing destination carrier is to debita spissitudo, in conjunction with vacuum infiltration method, by Agrobacterium Import the blastocyte of Nicotiana tabacum L.;
3) after aseptic filter paper draws unnecessary bacterium solution, the seed after infecting is sowed at and co-cultures in ware, and 28 DEG C of dark condition are cultivated 2d。
4) tobacco seed is moved into the soil of suitable growth, it is carried out Routine Management, to its grow to the 3-4 leaf phase carry out turn Genetic tobacco plant is identified, screening.
Described vacuum infiltration method is to be soaked by aseptic ultra-pure water resuspended Agrobacterium bacterium solution by the tobacco seed exposing embryo, Evacuation processes.
The condition that described evacuation processes is: soak 8-10min under 15Kpa pressure.
Its OD of Agrobacterium bacterium solution in described re-suspension liquid600For 0.3-0.5.
Described Agrobacterium bacterium solution adds acetosyringone (acetosyringone, AS) and surfactant (Silwet L-77)。
Described Agrobacterium is Agrobacterium tumefaciems (Agrobacterium tumefaciens) bacterial strain LBA4404, destination carrier For carrying quinolate phosphoribosyl transferase (Quinolinate phosphoribosyltransferases Transferase) gene QPT and the plant expression vector pQPT of screening report fusion gene (GUS ∷ NPT II).
Described step 3) in culture medium be desaccharide MS fluid medium.
The method that described transfer-gen plant identifies, screen is GUS histochemical stain and pcr analysis, screening GUS dyeing and The tobacco plant that PCR amplification is positive.
Before described tobacco seed carries out genetic transformation, all without disinfecting.
Described tobacco bred is K326 (Nicotiana tabacum L.var.K326).
Described step 1) in seed be collect ripe tobacco seed, in 40 DEG C of dry for standby.
The present invention, with Nicotiana tabacum L. mature seed as material, processes, with exposed embryo as receptor through grinding seed coat;Need not nothing Collarium border, under vacuum, utilizes agriculture bacillus mediated, exogenous gene imports tobacco gene group, thus obtains transgenic cigarette Grass.
The present invention needs not move through tissue culture, directly operates with seed, has the advantage that
The first, simple to operate.In addition to the cultivation of Agrobacterium, other steps are without operating in an aseptic environment.Avoid Plant tissue culture course's necessary culture medium preparation, the sterilization of outer implant, callus induction, subculture, train altogether, screen, regenerate Bud inducement, a series of complicated processes such as take root.
The second, growth cycle is short.Obtain transfer-gen plant and only need one growth cycle of Nicotiana tabacum L., relative to traditional tissue training The method required time supported is shorter.
3rd, repeatability is high with universality.Unified to the processing mode of material, easy, easily repeat.
4th, high financial profit.Directly use Agrobacterium bacterium solution to infect tobacco seed genetic transformation receptor, utilize soil to train Support Nicotiana tabacum L., decrease during Conventional reformat a series of manpower and materials needed for plant tissue culture and put into, can be greatly reduced Genetic transformation cost.
The term of the present invention and culture medium:
In the present invention, Agrobacterium cultivates general employing YEP culture medium (yeast extract 10g/L+ peptone 10g/L+NaCl 5g/L, pH 7.2, adds 15g/L agar in solid medium) cultivate.
Accompanying drawing explanation
Fig. 1 plant expression vector structure chart,
Wherein A is plant expression vector pSH737, and B is plant expression vector pQPT,
Seed conversion process agriculture bacillus mediated for Fig. 2,
A: the tobacco seed that after grinding, seed coat is impaired;B: the tobacco seed co-cultured after infecting;C: application of vacuum seed with Agrobacterium infects the mixture of liquid;D: training terminates rear planting seed in seedlings nursing plate altogether;E: infect seed germination.
Fig. 3 GUS histochemical stain and PCR identify
Wt: represent wild-type tobacco plants (Wild-type plants);Tp: represent transgenic tobacco plant (Transgenic plants)
Fig. 4 QPT gene PCR testing result
M:5000bp DNA Marker;P: positive plasmid compares;1-3: transfer-gen plant;N: negative control
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment: use this method to obtain Nicotiana tabacum L. K326 transfer-gen plant.
1, plant expression vector construction and the activation of engineering Agrobacterium
Studying the plant expression vector pSH737 (A in Fig. 1) to preserve is that initial carrier is transformed.In pSH737 carrier Containing a multiple clone site (multiple cloning site, MCS), containing Xba I, BamH I, Xma I, Sma I, The restriction enzyme sites such as Asp718, Kpn I and EcoR I.Respectively with BamH I and Kpn I double digestion plant expression vector pSH737 and The two ends of synthetic are with BamH I and the QPT genetic fragment of Kpn I restriction enzyme site, afterwards at T4Under DNA ligase effect It is attached, is built into plant expression vector pQPT (in Fig. 1 B, the public can be provided by this carrier).QPT gene code quinoline Acid phosphoric acid phosphoribosynltransferase, this enzyme catalysis quinolinic acid forms NAMN (NAMN), enters pyridine nucleotide circulation with this, And then formation nicotinic acid.Research shows, QPT is the rate-limiting step of nicotine biosynthetic branch approach pyridine nucleotide circulation.For Cause the change of tobacco plant alkaloid and cause physiological shaped in transfer-gen plant after research Nicotiana tabacum L. overexpression QPT The change of state, utilizes Agrobacterium freeze-thaw method that the plant expression vector pQPT built is imported competence Agrobacterium tumefaciems (A.tumefaciens) in bacterial strain LBA4404, and tobacco seed is carried out quick genetic transformation.Screening in Vector map Reporter gene is fusion gene, i.e. GUS ∷ NPT II, wherein NPT II gene code neomycin phosphotransferase (neomycin Phosphotransferase), neomycin and kanamycin all there is resistance.Agrobacterium tumefaciems (A.tumefaciens) bacterial strain LBA4404, carries the pQPT carrier of quinolate phosphoribosyl transferase gene, and streak inoculation (contains in YEP solid medium On 20mg/L rifampicin (Rif)+50mg/L kanamycin (Kan).It is placed in incubator, after cultivating 2d under 28 DEG C of dark conditions, takes Go out culture medium picking list bacterium colony in YEP solid medium (containing 20mg/L rifampicin (Rif)+50mg/L kanamycin (Kan) On, it is placed in incubator, after cultivating 2d under 28 DEG C of dark conditions, resuspended with aseptic ultra-pure water, observe its bacterial concentration, and survey it OD600Value, until bacterium solution OD600=0.3-0.5.
2, Nicotiana tabacum L. genetic transformation receptor prepares
Take K326 mature seed, seed is put into and 1.5mL centrifuge tube coordinates glass grinding rod appropriateness grind seed coat, thus Expose its embryo (A in Fig. 2).
3, the genetic transformation of Nicotiana tabacum L.
Ready tobacco seed material is put into resuspended Agrobacterium bacterium solution, adds surface activity by the concentration of 200 μ L/L The concentration of agent (SILWET 1-77) and 1mL/L adds acetosyringone (As), application of vacuum 8-10min under 15Kpa pressure (C in Fig. 2), outwells bacterium solution, is placed in clean culture dish, adds aseptic ultra-pure water and cleans 2-3 time, is inhaled by surface liquid filter paper Dry.Draw 2mL desaccharide MS fluid medium to be laid in culture dish (diameter 9cm), the subset after Agrobacterium is infected is put It is placed in culture dish center, under 28 DEG C of dark conditions, cultivates 2d (B in Fig. 2).Planting seed after co-culturing afterwards is in soil Germination and growth is to the 2-3 leaf phase.(D in Fig. 2, E), co-culturing base is sterilizing MS fluid medium (removing sucrose).
4, transgenic tobacco plant is identified
4.1 transformation of tobacco GUS histochemical stains are identified
Tobacco seed after cultivating is seeded in soil, waits that it grows, and its Nicotiana tabacum L. tender leaf is carried out GUS systematism Learning dyeing detection, concrete grammar is as follows: clip Nicotiana tabacum L. tender leaf, puts in PCR pipe, and (the bromo-4-of 5-is chloro-to add the X-Gluc of 40 μ L 3-indole-β-D-Glucose glycosides) dyeing liquor, place 12h, sucking-off X-Gluc for 37 DEG C, add ethanol (75%) solution of 200ul, Its chlorophyll is taken off, compares with matched group, filter out the positive plant (Fig. 3) of blueness.
4.2 transformation of tobacco PCR detections
Take the plant of GUS dyeing tests positive, use DNAsecure Plant Kit (TIANGEN company) test kit Extract the DNA of tobacco leaf.Concrete grammar is as follows:
(1) take the Nicotiana tabacum L. fresh blade 100mg that GUS detection is positive, shred to mortar, add liquid nitrogen, be fully ground.
(2) blade after grinding, be equipped with the 2mL of 400 μ L buffer LP1 and 6 μ L RNase A (10mg/mL) from Heart pipe, vortex vibration 1min, room temperature places 10min.
(3) 130 μ L buffer LP2, liquid-transfering gun piping and druming mixing, vortex vibration 1min are added.
(4) 12,000rpm is centrifuged 5min, is moved to by supernatant in new 2mL centrifuge tube.
(5) the buffer LP3 of 1.5 times of volumes, immediately fully vibration mixing 15sec are added, until flocculent deposit occurs.
(6) previous step gained solution and flocculent deposit are all added in an adsorption column CB3 that (adsorption column puts into collecting pipe In), 12,000rpm are centrifuged 30sec, outwell waste liquid, and adsorption column CB3 puts in collecting pipe.
(7) adding 600 μ L rinsing liquid PW in adsorption column CB3,12,000rpm are centrifuged 30sec, outwell waste liquid, will absorption Post CB3 puts in collecting pipe.
(8) previous action is repeated.
(9) putting back in collecting pipe by adsorption column CB3,12,000rpm are centrifuged 2min, outwell waste liquid.Adsorption column CB3 is placed in Room temperature places several minutes, thoroughly dries rinsing liquid remaining in adsorbing material.
(10) adsorption column CB3 is proceeded in a clean centrifuge tube, the unsettled dropping 50-to the middle part of adsorbed film 200 μ L elution buffer TE, room temperature placement 2-5min, 12,000rpm are centrifuged 2min, are collected in centrifuge tube by solution.
Agrobacterium plasmid extracts, and uses the TIANGEN company little extraction reagent kit of plasmid to extract, and concrete grammar is as follows:
(1) column equilibration step: (adsorption column is put in collecting pipe) adds the balance liquid BL of 500 μ L in adsorption column CP3, 12,000rpm are centrifuged 1min, outwell the waste liquid in collecting pipe, and adsorption column is put back in collecting pipe.
(2) taking bacterium solution 1-5ml of incubated overnight, add in centrifuge tube, 12,000rpm are centrifuged 1min, draw supernatant.
(3) in the centrifuge tube leave bacterial sediment, add 250 μ L solution P1, use pipettor or vortex oscillator thorough Suspended bacterial precipitates.
(4) in centrifuge tube, add 250 μ L solution P2, leniently spin upside down 6-8 time and make thalline fully crack.
(5) in centrifuge tube, add 350 μ L solution P3, the most leniently spin upside down 6-8 time, fully mix, now will White flock precipitate occurs.12,000rpm are centrifuged 10min, now form precipitation bottom centrifuge tube.
(6) the supernatant pipettor that previous step is collected is transferred in adsorption column CP 3 that (adsorption column puts into collecting pipe In), note sucking-off precipitation of trying not.12,000rpm are centrifuged 30-60s, outwell the waste liquid in collecting pipe, by adsorption column CP 3 Put in collecting pipe.
(7) adding 600 μ L rinsing liquid PW in adsorption column CP 3,12,000rpm are centrifuged 30-60s, outwell in collecting pipe Waste liquid, puts into adsorption column CP 3 in collecting pipe.
(8) step (7) is repeated.
(9) putting in collecting pipe by adsorption column CP 3,12,000rpm are centrifuged 2min, remove rinsing remaining in adsorption column Liquid.
(10) adsorption column CP 3 is placed in a clean centrifuge tube, drips 50-100 μ l to the middle part of adsorbed film Elution buffer EB, room temperature placement 2min, 12,000rpm are centrifuged 1min, are collected in centrifuge tube by plasmid solution.
QPT gene is carried out PCR detection, respectively by transgene tobacco DNA, Agrobacterium plasmid product, carry out as template PCR expands;Its gene primer is by the synthesis of the handsome biological company limited in Shanghai.Primer sequence is: Forward primer:5 '- Cgcacaatcccactatcctt-3 ': Reverse primer:5 '-ttagagctttgccgacacct-3 ', PCR response procedures For: preheat 94 DEG C of 3min;(94℃30s;58℃1min;68 DEG C of 2min 30s) 35 circular response;68℃5min;16 DEG C of guarantors Deposit.
PCR after completion of the reaction, takes 5 μ L amplified productions, electrophoresis in the agarose gel electrophoresis of 1%, Bio-Rad gel imaging Observe under system instrument and take a picture.PCR amplification shows, 3 strain positive plants all can amplify target stripe (Fig. 4).
4.3 seed genetic transformation rate statistics
Often approving and forwardingization tobacco seed about 100, co-culture after planting statistics sprouting and obtain tobacco seedlings about 14-20 strain, through GUS group The plant about 3-5 strain that weave chemistry dyeing and PCR are positive after expanding, seed germination rate is 14%-20%, and conversion ratio is 15%- 36%.

Claims (10)

1. a most agriculture bacillus mediated tobacco seed genetic transforming method, employing following steps:
1) choosing full seed is experiment material, destroys seed coat thus its embryo exposed with grinding pestle grinding seed;
2) adjustment engineering Agrobacterium bacterium solution containing destination carrier is to debita spissitudo, in conjunction with vacuum infiltration method, is imported by Agrobacterium The blastocyte of Nicotiana tabacum L.;
3), after aseptic filter paper draws unnecessary bacterium solution, the seed after infecting is sowed in culture dish cultivates 2d in 28 DEG C of dark condition.
4) tobacco seed is moved into the soil of suitable growth, it is carried out Routine Management, grow to the 3-4 leaf phase to it and carry out transgenic Tobacco plant is identified, screening.
Method the most according to claim 1, described vacuum infiltration method is to be surpassed with aseptic by the tobacco seed exposing embryo Pure water resuspended Agrobacterium bacterium solution is soaked, and evacuation processes.
Method the most according to claim 2, the condition that described evacuation processes is: soak 8-10min under 15Kpa pressure.
Method the most according to claim 3, its OD of Agrobacterium bacterium solution in described re-suspension liquid600For 0.3-0.5.
Method the most according to claim 4, adds acetosyringone (AS) and surfactant in described Agrobacterium bacterium solution (Silwet L-77)。
Method the most according to claim 1, described Agrobacterium is agrobacterium tumefaciens bacterial strain LBA4404, and destination carrier is for taking Band quinolate phosphoribosyl transferase (Quinolinate phosphoribosyltransferases transferase) base Because of QPT and the pQPT carrier of kanamycin (kanamycin) resistant gene.
Method the most according to claim 6, transfer-gen plant identifies, the method screened is GUS histochemical stain and PCR Analyzing, screening GUS dyeing and PCR expand positive tobacco plant.
Method the most according to claim 1, described step 3) in culture medium be desaccharide MS fluid medium.
Method the most according to claim 1, described step 1) in seed be the ripe tobacco seed collected, in 40 DEG C of bakings Dry standby;Before described tobacco seed carries out genetic transformation, all without disinfecting.
Method the most according to claim 1, described tobacco bred is K326 (Nicotiana tabacum L.var.K326)。
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CN109315290A (en) * 2018-11-14 2019-02-12 云南中烟工业有限责任公司 A method of induction Hongda tobacco Hairy root and plant regeneration
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