CN101086017A

CN101086017A - Mushroom 507 bacteria molecular specific mark and its obtaining method and uses

Info

Publication number: CN101086017A
Application number: CNA2007100403229A
Authority: CN
Inventors: 宋春艳; 谭琦; 陈明杰; 尚晓冬; 潘迎捷
Original assignee: Edible Mushroom Research Institute Shanghai Academy Of Agricultural Sciences
Current assignee: Edible Mushroom Research Institute Shanghai Academy Of Agricultural Sciences
Priority date: 2007-04-29
Filing date: 2007-04-29
Publication date: 2007-12-12
Anticipated expiration: 2027-04-29
Also published as: CN101086017B

Abstract

The invention relates to a molecular special mark for mushroom 507 bacterial and the preparation method and application. The section of molecular marked DNA of mushroom 507 bacterial is 368 bp, the specific PCR augmentation primer squence is 5'AGGTCTATGTTCAGGAAGT 3'and 5'ATGCTGTATACGTGTTGTG 3'. The method comprises following steps: culturing bacterial filament and extracting genetic DNA; getting specific DNA section of mushroom 507 bacterial; getting specific PCR augmentation primer; SCAR- PCR augmentation; and ionophresis detection. The molecular mark can be used for fast determination and detection for mushroom 507 bacterial.

Description

A kind of molecule marker of mushroom 507 bacterial classifications and preparation method and application

Technical field

The invention belongs to biological technical field, be specifically related to a kind of molecule marker and preparation method and application of mushroom 507 bacterial classifications.

Background technology

China's mushroom production is from 1.95 ten thousand tons of 2,420,000 tons of developing 2005 rapidly of nineteen eighty-three, account for more than 70% of global mushroom ultimate production, rewritten the ranking list of world's edible mushrooms output, and constantly dwindle and the Twospore Mushroom poor distance of ranking first, scholarly forecast is arranged, because the fast development of Chinese mushroom industry, it will become the highest edible mushrooms of world wide production in nearly 10 years.China's mushroom is with its alarming development speed, and fine quality and cheap cost are that world mushroom industry personage attractes attention the fashionable world of Chinese mushroom.

The contribution rate of good quality strain in mushroom per unit area yield and quality is very important, and this has determined the critical role of mushroom strain in the mushroom industry.China had signed " international new variety of plant protection method " in 1999; this not only requires us to respect other national kind intellecture property; also to strengthen simultaneously protecting the kind intellecture property of our country oneself; really protect the kind property right of China in order to set up edible mushrooms new variety resignation system; must at first set up sophisticated cultivar identification technology, for the new variety registration lays the foundation.Especially Japan on April 1st, 2004 came into effect " seedling method amendment ", to the export mixes of China edible mushrooms especially mushroom great threat.With regard to domestic, the phenomenon of cultivating champignon bacterial classification " different name of the same race, xenogenesis is of the same name " has brought great loss not only for the mushroom farming, has influenced their cultivation enthusiasm, has also greatly influenced the fast development of Chinese mushroom; And, more and more higher along with the appearance of large-scale factory culture mode to the requirement of cultivating champignon bacterial strain quality, need more easy, the identification of strains technology fast and accurately of development, with guarantee every batch with kind all accurate.

Along with the foundation of the fast development of Protocols in Molecular Biology, particularly molecule marker and genetic marker technology with ripe, easy for developing, the identification of strains technology provides effective means fast and accurately.SCAR (Sequence CharacterizedAmplified Region) mark is a kind of very stable molecule marker, on using, have rapid, easy, characteristics cheaply, the present invention has set up the SCAR molecule marker of mushroom 507 bacterial classifications, can carry out Rapid identification to mushroom 507 bacterial classifications.

Summary of the invention

The objective of the invention is for can to mushroom 507 bacterial classifications carry out easy, identify fast and accurately and detect, a kind of molecule marker of mushroom 507 bacterial classifications is provided, the preparation method of the molecule marker of this mushroom 507 bacterial classifications is provided simultaneously.

A kind of molecular specific mark of mushroom 507 bacterial classifications is the specific fragment of 368bp size, and its specific PCR amplimer to sequence is: 5 ' AGGTCTATGTTCAGGAAGT 3 ' and 5 ' ATGCTGTATACGTGTTGTG 3 '.

A kind of preparation method of molecular specific mark of mushroom 507 bacterial classifications comprises the following steps:

(1) extraction of mycelium culture and genomic dna.

(2) the pulsating acquisition of the specific DNA of Xianggu mushroom strain 507: adopt round pcr, through a large amount of shaker tests, (primer sequence: AGGGCGTAAG) obtained the specific DNA segment of Xianggu mushroom strain 507, molecular weight is 405bp, with this fragment cloning order-checking to adopt random primer.

(3) acquisition of specific PCR amplimer: based on the dna sequence dna that obtains, design specific PCR amplimer, the right sequence of primer is as follows: 5 ' AGGTCTATGTTCAGGAAGT 3 ' and 5 ' ATGCTGTATACGTGTTGTG 3 '.

(4) increase to 507 bacterial strains being carried out SCAR-PCR with the specific PCR amplimer.

(5) specific fragment (Fig. 1) of the visible 368bp size of electrophoresis detection.And other mushroom strain there is no the specificity segment.

According to adopting this a pair of special primer to carry out pcr amplification, can produce the 368bpDNA fragment as the foundation that mushroom 507 bacterial strains are identified and detected.

This detection method is compared with conventional morphologic detection, antagonistic effect, fruiting experiment, has weak point detection time, advantage of high accuracy.This detection required time only needs 2-3 days, and conventional antagonistic effect required time needs two time-of-weeks at least, and fruiting experiment then needs at least 3 months time; This method is produced the specificity that has 507 bacterial strains in the bacterial strain at 164 mushrooms of collected China.

Description of drawings

Fig. 1 mushroom 507 bacterial strain special primer for checking carry out the SCAR-PCR amplification to Xianggu mushroom strain

23 is 507 bacterial strains (Sanming City, Fujian Province fungal studies institutes) among the figure, and arrow is depicted as mushroom 507 bacterial strains and amplifies the special DNA band that molecular weight is about 368bp, the negative contrast of ck, and all the other are numbered other Xianggu mushroom strain.

Embodiment

Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

Embodiment 1

(1) the pulsating acquisition of the specific DNA of Xianggu mushroom strain 507: adopt round pcr, through a large amount of shaker tests, (primer sequence: AGGGCGTAAG) obtained the specific DNA segment of Xianggu mushroom strain 507, molecular weight is 368bp, with this fragment cloning order-checking to adopt random primer.

(2) specific PCR amplimer: based on the dna sequence dna that obtains, design specific PCR amplimer, the right sequence of primer is as follows: 5 ' AGGTCTATGTTCAGGAAGT 3 ' and 5 ' ATGCTGTATACGTGTTGTG 3 '.

(3) extraction of mycelium culture and genomic dna: the Xianggu mushroom strain 507 of cryopreservation is transferred on the PDA inclined-plane, cultivates activation for 25 ℃.Receive after two weeks in the 100mL PD liquid nutrient medium, 25 ℃ of two weeks of 100r/min shaking culture, collect mycelia, it is frozen to put into-20 ℃ of refrigerators.Extract genomic dna with improved CTAB method, DNA is diluted to 20ng/ μ L, and-20 ℃ of refrigerator storages are standby.

(4) pcr amplification of SCAR molecule marker: the amplification system cumulative volume is: 25 μ L, 10 * PCR buffer, 2.5 μ L, 25mmol/L MgCL ₂2 μ L, 10mmol/L dNTP 0.25L, 2.5U/ μ L Taq DNA enzyme 0.5 μ L, 10 μ mol/L, 507 bacterial strains detect primer special to each 1 μ L, template DNA 1 μ L (concentration 1ng～10ng/ μ L), ddH ₂O 18.6 μ L.PCR reaction conditions: 94 ℃ of 1min; 94 ℃ of 15second, 61 ℃ of 15second, 72 ℃ of 1min, 30 circulations; 72 ℃ of 5min.

In order to get rid of the false negative situation of other bacterial classification, in the SCAR-PCR reaction system, add ITS (InternalTranscribed Spacer) universal primer to (ITS1, ITS4), verify the integrity of all template DNAs.

(5) electrophoresis detection: get above-mentioned pcr amplification product 8 μ L, with 1 μ L sample loading buffer mixing, point sample is on 1.5% fine jade vinegar sugar gel, in 0.5 X tbe buffer liquid, electrophoresis under the 5V/cm voltage is after electrophoresis finishes, with EB dyeing, on the gel imaging instrument, take a picture then.

Embodiment 2

To 114 (for produce with kind) individual collection from mushroom production in all parts of the country with bacterial classification and minority wild species totally 164 bacterial strains carry out SCAR and increase.The single-minded SCAR mark that has had only mushroom 507 bacterial strains to amplify in 164 bacterial classifications.

Claims

1. the molecular specific mark of mushroom 507 bacterial classifications, it is characterized in that: the specific PCR amplimer is 5 ' AGGTCTATGTTCAGGAAGT 3 ' and 5 ' ATGCTGTATACGTGTTGTG 3 ' to sequence; The dna segment size is 368bp.

2. the preparation method of the molecular specific mark of mushroom 507 bacterial classifications comprises the steps:

(1) extraction of mycelium culture and genomic dna;

(2) the pulsating acquisition of the specific DNA of Xianggu mushroom strain 507;

(3) acquisition of specific PCR amplimer;

(4) increase to 507 bacterial strains being carried out SCAR-PCR with the specific PCR amplimer;

(5) electrophoresis detection.

3. the preparation method of the molecular specific mark of a kind of mushroom 507 bacterial classifications as claimed in claim 2, it is characterized in that: the specific DNA segment of Xianggu mushroom strain 507 is by adopting round pcr in the described step (2), through a large amount of shaker tests, the employing random primer obtains, molecular weight is 405bp, with this fragment cloning order-checking.

4. the preparation method of the molecule marker of a kind of mushroom 507 bacterial classifications as claimed in claim 3 is characterized in that: used random primer sequence is: AGGGCGTAAG.

5. the preparation method of the molecular specific mark of a kind of mushroom 507 bacterial classifications as claimed in claim 2, it is characterized in that: the specific PCR amplimer obtains by following method in the described step (3): based on the dna sequence dna that obtains, design specific PCR amplimer, the right sequence of primer is as follows: 5 ' AGGTCTATGTTCAGGAAGT 3 ' and 5 ' ATGCTGTATACGTGTTGTG 3 '.

6. the preparation method of the molecular specific mark of a kind of mushroom 507 bacterial classifications as claimed in claim 2, it is characterized in that: the extraction of mycelium culture and genomic dna comprises the following steps: the mushroom strain of cryopreservation is transferred on the PDA inclined-plane in the described step (1), cultivate activation for 25 ℃, receive after two weeks in the 100mL PD liquid nutrient medium, 25 ℃ of two weeks of 100r/min shaking culture, collect mycelia, it is frozen to put into-20 ℃ of refrigerators; Extract genomic dna with improved CTAB method, DNA is diluted to 20ng/ μ L, and-20 ℃ of refrigerator storages are standby.

7. the preparation method of the molecular specific mark of a kind of mushroom 507 bacterial classifications as claimed in claim 2, it is characterized in that: the SCAR-PCR amplification in the described step (4): the amplification system cumulative volume is: 25 μ L, amplification system: 10 * PCR buffer2.5 μ L, 25mmol/L MgCL ₂2 μ L, 10mmol/L dNTP 0.25L, 2.5U/ μ L Taq DNA enzyme 0.5 μ L, 10 μ mol/L mushrooms, 507 bacterial strains detect primer special to each 1 μ L, template DNA 1 μ L (concentration 1ng～10ng/ μ L), ddH ₂O 18.6 μ L, PCR reaction conditions: 94 ℃ of 1min; 94 ℃ of 15second, 61 ℃ of 15second, 72 ℃ of 1min, 30 circulations; 72 ℃ of 5min.

8. the preparation method of the molecular specific mark of a kind of mushroom 507 bacterial classifications as claimed in claim 2, it is characterized in that: add ITS (Internal TranscribedSpacer) in the pcr amplification reaction system of SCAR molecule marker in the described step (4), universal primer is to (ITS1, ITS4).

9. the preparation method of the molecular specific mark of a kind of mushroom 507 bacterial classifications as claimed in claim 2, it is characterized in that: described step (5) electrophoresis detection is: get step (4) pcr amplification product 8 μ L, with 1 μ L sample loading buffer mixing, point sample is on 1.5% fine jade vinegar sugar gel, in 0.5 X tbe buffer liquid, electrophoresis under the 5V/cm voltage is after electrophoresis finishes, with EB dyeing, on the gel imaging instrument, take a picture then.

10. the molecular specific mark of mushroom 507 bacterial classifications is applied to the Rapid identification and the detection of mushroom 507 bacterial classifications.