The content of the invention
It is an object of the present invention to provide the one plant of spindle lysine gemma obtained through screening, agricultural chemicals induction, domestication
Bacillus strain.
Spindle lysine bacillus (Lysinibacillus fusiformis) bacterial strain provided by the invention (is designated as
FY-7), its deposit number is CGMCC No.13523.
Spindle lysine bacillus (Lysinibacillus fusiformis) bacterial strain is through screening purpose bacterium
Strain and to purpose bacterial strain through single agricultural chemicals and blended induction, domestication obtain, comprise the following steps:
1) by the purpose bacterial strain rejuvenation of screening;
2) culture medium containing different active ingredient concentration agricultural chemicals is prepared using agricultural chemicals chlopyrifos, by the purpose of step 1) rejuvenation
Bacterial strain streak inoculation, culture and by continuous induction culturing (by improving constantly pesticide concentration), cultivate be resistant to it is higher
Chlopyrifos concentration aimed strain;
3) agricultural chemicals chlopyrifos, carbendazim, procymidone and dimethomorph isoconcentration are mixed, and after being diluted to finite concentration
It is added in culture medium, is configured to the culture medium containing different effective ingredient concentration agricultural chemicals.The aimed strain that step 2) is obtained again
Streak inoculation, culture simultaneously obtain being resistant to higher agriculture by continuous induction culturing (by improving constantly pesticide concentration), cultivation
The bacterial strain of concentration, final separation obtain one plant of spindle lysine bacillus (Lysinibacillus fusiformis)
Bacterial strain (is designated as FY-7).
Second object of the present invention is to provide a kind of method for producing biodegradable enzyme.
The method of production biodegradable enzyme provided by the invention, comprises the following steps:By above-mentioned spindle lysine gemma
After bacillus (Lysinibacillus fusiformis) bacterial strain FY-7 fermentations, thalline, broken born of the same parents, centrifugation are collected, extracts supernatant,
Obtain biodegradable enzyme solutions.
In the method for above-mentioned production biodegradable enzyme, the condition of the fermentation is to be cultivated in 34-39 DEG C, 180-200rpm
16-24 hours.
In the method for above-mentioned production biodegradable enzyme, the component for the fermentation medium that the fermentation uses is as follows:Every liter institute
Stating fermentation medium includes tryptone 17-19g, phytone 1-4g, sodium chloride 2-5g, dipotassium hydrogen phosphate 2-5g and grape
Sugared 2-5g, volume is supplied with water;The pH value of fermentation medium is 6.8-7.6, preferably 7.0-7.4.
In the method for above-mentioned production biodegradable enzyme, the fermentation specifically includes following steps:By spindle lysine bud
Spore bacillus (Lysinibacillus fusiformis) bacterial strain FY-7 strains obtain seed by expanding culture, and seed is inoculated with
Cultivated into the fermentation medium under conditions of the fermentation.
The condition for expanding culture is to cultivate 16-24h in 34-39 DEG C, 180-200rpm.
The strain is by above-mentioned spindle lysine bacillus (Lysinibacillus fusiformis) bacterial strain
FY-7 thalline is suspended in the solution obtained in phosphate buffer.
In the method for above-mentioned production biodegradable enzyme, after the fermentation, by tunning in 12000-14000rpm, temperature
4-6 DEG C of degree, 15-25min is centrifuged, collect thalline, height crushes born of the same parents after thalline is resuspended, then in 8000-10000rpm, temperature 4-
6 DEG C, 50-65min is centrifuged, supernatant is collected, by supernatant liquid filtering, obtains biodegradable enzyme solutions.
Third object of the present invention is to provide a kind of biodegradable enzyme preparation.
Biodegradable enzyme preparation provided by the invention, its active component are above-mentioned spindle lysine bacillus
(Lysinibacillus fusiformis) bacterial strain FY-7 or above-mentioned biodegradable enzymes.
Fourth object of the present invention is to provide above-mentioned spindle lysine bacillus (Lysinibacillus
Fusiformis) bacterial strain FY-7, biodegradable enzyme and biodegradable enzyme preparation are in pesticide residual degradation, particularly vegetables and fruits residues of pesticides
Application in degraded.
The concentration of the biodegradable enzyme or biodegradable enzyme preparation in vegetables and fruits chemical residual degradation is 2.5-
15ppm, optimal is 2.5-7.5ppm, different because of specific vegetables and fruits.
Beneficial effects of the present invention are embodied in:
The experiment proves that present invention induction, domestication obtain spindle lysine bacillus
(Lysinibacillus fusiformis) bacterial strain FY-7, extraction endocellular enzyme can be used as biology drop after fermented and cultured is carried out to it
Enzyme is solved, the residues of pesticides that the biodegradable enzyme may act in vegetables and fruits, makes Multiple Pesticides residue degrading, reaches removal residues of pesticides
Effect, there is application potential in chemical residual degradation field.
Colorimetric method for determining bacterial number, i.e. turbidity counting method are used in embodiment;With the light absorption value OD of culture600Table
Show the increment of bacterium.
Example 1, the separation identification of spindle lysine Bacillus strain
First, the collection of pedotheque
It is collected in insecticide factory's floss hole sludge.
2nd, the separation screening of bacterial strain
Sludge 10g is weighed in 100mL inorganic salt liquid culture mediums, inorganic salt liquid medium component is as follows:
MgSO4·7H2O 0.2g;K2HPO40.1g;(NH4)2SO40.1g;CaSO40.04g;FeSO4·7H2O
0.001g;Deionized water 1L;pH 7.0.121 DEG C of sterilizing 30min.
The chlopyrifos that concentration is 100mg/L is added in inorganic salt liquid culture medium, nutrient solution is obtained, in 37 DEG C, 180r/
Min shaking table cultures, it is so anti-in 10% inoculum concentration access fresh medium, to transfer weekly once later after cultivating one week
Multiple repeatedly domestication.Finally, isolated and purified, be inoculated into the LB culture mediums containing 100ppm chlopyrifos with plate dilution method,
Select and grow best inoculation inclined-plane, numbering, which preserves, to be used to tame.
3rd, identify
Specific authentication step is as follows:Extraction numbering preserves the STb gene of bacterial strain and is used as template, using universal primer ITS1
(5 '-TCCGTAGGTGAACCTGCGG-3 ') and ITS4 (5 '-TCCTCCGCTTATTGATATG-3 '), PCR expand to obtain it
ITS, 947bp nucleotide sequence (referring to SEQ.ID.NO.1), sequence analysis analysis shows are obtained through sequencing:Numbering
Preserve bacterial strain and the homology highest of spindle lysine bacillus (Lysinibacillus fusiformis).
Example 2, the induction of spindle lysine Bacillus strain, domestication
First, chlopyrifos induction, domestication
1. the active constituent content section that chlopyrifos is prepared:300mg/L-800mg/L.Prepare the chlopyrifos containing various concentrations
Tryptone agar.Different amounts of chlopyrifos is added in tryptone agar respectively the culture medium containing chlopyrifos is made.
Specific steps:1) chlopyrifos is configured to 4500mg/L pesticide standard liquid.The pesticide standard liquid of 4500mg/L concentration is taken respectively
13.3mL, 17.8mL, 22.2mL, 26.6mL, 31.1mL, 35.6mL are added in 200mL tryptone agars, are configured to contain and are poisoned with poison
Tick 300mg/L, 400mg/L, 500mg/L, 600mg/L, 700mg/L and 800mg/L tryptone agar culture medium.Flat board system
Make:By the tryptone agar pour plate of the chlopyrifos containing 300mg/L-800mg/L prepared, 15mL/ wares, solidification to be cooled
After use.
Tryptone agar composition is:Per L tryptones containing 18g, 2g phytones, 5g sodium chloride and 15g agar
(pH is 7.3 ± 0.2).
2. all purposes bacterial strain is distinguished into streak inoculation in middle 300mg/L flat board.
3. the flat board being inoculated with is placed in 37 DEG C of constant incubators, 24h is cultivated.
4. then by the flat board of cultured bacterial strain renewed vaccination to 400mg/L.The flat board being inoculated with is placed in 37 DEG C of perseverances
In warm incubator, cultivate 24 hours.
5. progressively continuing to cultivate in 500mg/L, 600mg/L, 700mg/L and 800mg/L flat board, finally obtain and be resistant to
The aimed strain of 800mg/L organophosphorus pesticides (chlopyrifos).
2nd, blended induction, domestication
1. blended dilution process
Chlopyrifos, carbendazim, procymidone and dimethomorph is dense into 6.2% with pH7.2 phosphate buffered salines respectively
The solution of degree.
2. being 6.2% four kinds of the pesticide solutions by active constituent content, respectively take 3.60mL to be well mixed, obtain mixing agriculture
Medicine.
3. blended 0.97mL, 1.30mL, 1.61mL, 1.94mL, 2.26mL, 2.58mL is taken to be separately added into 200mL pancreases
In peptone agar, it is well mixed, is configured to 300mg/L, 400mg/L, 500mg/L, 600mg/L, 700mg/L and 800mg/L
Blended tryptone agar culture medium, and flat board is made.
4. the aimed strain for being resistant to 800mg/L organophosphorus pesticides (chlopyrifos) is transferred to the flat of 300mg/L blendeds
In plate.The flat board being inoculated with is placed in 37 DEG C of constant incubators, cultivated 24 hours.
5. stepping up blended concentration in flat board, continue to induce, tame, obtain one plant of degradable high concentration mixing agriculture
The bacterial strain of medicine, is designated as FY-7, and chlorpyrifos degradation and carbendazim contrast effect are as shown in Figure 1 before and after inducing and acclimating.
It is common that above-mentioned bacterial strains FY-7 has been preserved in China Committee for Culture Collection of Microorganisms on December 30th, 2016
(abbreviation CGMCC, address are at microorganism center:Yard 1, BeiChen xi Road, Chaoyang District, Beijing City 3), deposit number CGMCC
No.13523, Classification And Nomenclature are spindle lysine bacillus (Lysinibacillus fusiformis).
6. rinsed with sterile phosphate buffer by obtained FY-7 thalline are tamed from culture dish, with repeatedly from
The method washing thalline of heart resuspension 3 times, weighs, and is 0.1g by thalline and phosphate buffer (pH7.2):500 μ L ratio weight
New suspension thalline.50% glycerine water solution of sterilizing and bacterium solution are pressed 1:Dispensed after 1 mixing, often the μ L of pipe 500, it is cold in 4 DEG C of refrigerators
Hide.
Example 3, using spindle lysine Bacillus strain FY-7 prepare biodegradable enzyme preparation
1. strain amplification cultivation:The strain of refrigeration is taken to be inoculated into the sterile TSB culture mediums of 100mL, 37 DEG C, 180rpm trainings
Support 24h, as first order seed;First order seed is forwarded in 1L TSB culture mediums by 10% inoculum concentration, 37 DEG C, 180rpm trainings
Support 24 hours, as secondary seed.Secondary seed is forwarded in 10L industrial culture medium by 10% inoculum concentration, 37 DEG C,
180rpm cultivates 24h, as three-level seed.
2. three-level seed is inoculated into fermentation tank, inoculum concentration is the 5% of fermentation medium.It is 2.5m to control throughput3/
H, temperature be 37 DEG C, pH be 7.2 ± 0.4, rotating speed 180rpm, every when sample, determine OD600And pH, centre is according to foam situation
Sterile defoamer is added in right amount.Lower tank after fermenting 18 hours.
3. by zymotic fluid high speed centrifugation (14000rpm, temperature are 4 DEG C) 15-20min in fermentation tank, liquid is abandoned, is collected
Thalline.Thalline is pressed 1 with phosphate buffer:10 (g/mL) suspend again, obtain bacteria suspension.
4. using high pressure cell cracker, in 4-6 DEG C of 2.5-5.0MPa, temperature, the resuspension thalline of bacteria suspension is crushed, crushes two
It is secondary, obtain broken liquid.
5. broken liquid centrifuges 50min in 8000rpm (4 DEG C of temperature), supernatant is biodegradable enzyme crude enzyme liquid.
6. filtering:First with 6-8 layers filter paper filtering crude enzyme liquid, then with aperture it is 0.45 μm of membrane filtration, you can must clarify
Biodegradable enzyme solutions.
7. stabilization processes:Biodegradable enzyme solutions are diluted 100 times with phosphate buffer (pH7.2), add 0.01-
0.02% polyhexamethylene guanide, then be thoroughly mixed together in equal volume with the glycerine after sterilizing, 4 DEG C of preservations.
The component of the industrial culture medium (i.e. fermentation medium) is as follows:Fermentation medium is by tryptone described in per L
17g, phytone 3g, sodium chloride 5g, dipotassium hydrogen phosphate 2.5g, glucose 5g and water composition, volume is supplied with water.
The application of example 4, biodegradable enzyme preparation in vegetables (fruit) residues of pesticides of degrading
More representational vegetables cucumber is bought from wholesale vegetable market (Shouguang) and Lettuce is tested, first will be real
Example 3 obtains biodegradable enzyme solutions (enzyme preparation) and is added in pure water to obtain experimental liquid, and the concentration of enzyme preparation is 2.5-4ppm,
Corresponding vegetables are soaked in 3-5min in experimental liquid under 37-43 DEG C of water bath with thermostatic control, sending third party testing agency, (promise peace strength can business
(Qingdao) Co., Ltd is surveyed in product examine) detected.Cucumber and naked oats chemical residual degradation species (Boscalid, Mobucin, phonetic bacterium
Fat, dimethomorph, procymidone, metalaxyl, Propamocarb etc.) and effect is as shown in Figures 2 and 3.
Sequence table
<110>Xi'an Rutgers bio tech ltd
<120>The application of spindle lysine Bacillus strain, enzyme preparation and its degrading pesticide residues
<160> 3
<170> SIPOSequenceListing 1.0
<210> 1
<211> 947
<212> DNA
<213> Lysinibacillus fusiformis
<400> 1
ggcggctggc tccaaaaggt tacctcaccg acttcgggtg ttacaaactc tcgtggtgtg 60
acgggcggtg tgtacaaggc ccgggaacgt attcaccgcg gcatgctgat ccgcgattac 120
tagcgattcc ggcttcatgt aggcgagttg cagcctacaa tccgaactga gaacgacttt 180
atcggattag ctccctctcg cgagttggca accgtttgta tcgtccattg tagcacgtgt 240
gtagcccagg tcataagggg catgatgatt tgacgtcatc cccaccttcc tccggtttgt 300
caccggcagt caccttagag tgcccaacta aatgatggca actaagatca agggttgcgc 360
tcgttgcggg acttaaccca acatctcacg acacgagctg acgacaacca tgcaccacct 420
gtcaccgttg cccccgaagg ggaaactata tctctacagt ggtcaacggg atgtcaagac 480
ctggtaaggt tcttcgcgtt gcttcgaatt aaaccacatg ctccaccgct tgtgcgggcc 540
cccgtcaatt cctttgagtt tcagtcttgc gaccgtactc cccaggcgga gtgcttaatg 600
cgttagctgc agcactaagg ggcggaaacc ccctaacact tagcactcat cgtttacggc 660
gtggactacc agggtatcta atcctgtttg ctccccacgc tttcgcgcct cagcgtcagt 720
tacagaccag aaagtcgcct tcgccactgg tgttcctcca aatctctacg catttcaccg 780
ctacacttgg aattccactt tcctcttctg cactcaagtc ccccagtttc caatgaccct 840
ccacggttga gccgtgggct ttcacatcag acttaaagga ccgcctgcgc gcgctttacg 900
cccaataatt ccggacacgc ttgccaccta cgtattaccg cggctgc 947
<210> 2
<211> 19
<212> DNA
<213>Artificial synthesized ()
<400> 2
tccgtaggtg aacctgcgg 19
<210> 3
<211> 19
<212> DNA
<213>Artificial synthesized ()
<400> 3
tcctccgctt attgatatg 19