CN112795687B - SSR (simple sequence repeat) marker fingerprint spectrum of hypsizigus marmoreus HM21 strain as well as construction method and application thereof - Google Patents

Abstract

The invention discloses an SSR marker fingerprint of hypsizigus marmoreus HM21 strain and a construction method and application thereof, wherein the fingerprint consists of 6 pairs of SSR markers. The construction method comprises the following steps: (1) hypha culture; (2) extracting genome DNA; (3) detecting SSR molecular markers; and (4) detecting by capillary electrophoresis. The application comprises the following steps: and performing SSR marker amplification on the hypsizigus marmoreus strain, comparing the obtained banding pattern with the fingerprint spectrum, and obtaining the hypsizigus marmoreus HM21 strain which is consistent with the fingerprint spectrum. Compared with conventional morphological detection, antagonism test and fruiting test, the method has the advantages of short detection time, high accuracy and good repeatability, and has the specificity of hypsizigus marmoreus HM21 strains in the collected 56 hypsizigus marmoreus cultivation main culture strains at home and abroad.

Description

SSR (simple sequence repeat) marker fingerprint spectrum of hypsizigus marmoreus HM21 strain as well as construction method and application thereof

Technical Field

The invention belongs to the technical field of detection of hypsizigus marmoreus strains, and particularly relates to an SSR marker fingerprint of a hypsizigus marmoreus HM21 strain and a construction method and application thereof.

Background

Hypsizigus marmoreus (Peck) H.E.Bigelow, a species of Basidiomycota, agaricales, lyophyllaceae, is named due to marble patches on the surface of its pileus. The seafood soup is attractive in appearance, crisp and tender in texture, unique in seafood flavor and economical in price, and is popular with consumers. The hypsizigus marmoreus not only contains abundant vitamins and 18 amino acids, but also has the functions of hemolysis, antioxidation, leukemia and lymphoma cell inhibition, blood fat reduction, inflammation resistance, antioxidation and the like in components such as micromolecular compounds, polysaccharide, polypeptide and the like contained in the hypsizigus marmoreus through recent research, and is edible and medicinal fungi with high economic value. Since the first industrialized culture enterprise of hypsizygus marmoreus in China established in 2001, hypsizygus marmoreus becomes one of novel edible fungi which are developed in markets of China quickly. The industrialized total yield of the hypsizigus marmoreus in 2019 is 32.8 ten thousand tons, the yield is increased by 58.63 percent in comparison with that in 2018, the yield accounts for 9.6 percent of the industrialized total yield of the edible fungi, and the highest rank is found in the industrialized production total yield of edible fungi in China.

The high-quality strain plays a very important role in the industrial cultivation of the hypsizigus marmoreus. At present, hypsizigus marmoreus strains used by industrialized production enterprises in China are mainly introduced into Japan or further bred by hybridization on the basis of the introduced strains, the cultivated hypsizigus marmoreus has brown fruiting bodies called as crab-flavor mushrooms, and the cultivated hypsizigus marmoreus has white fruiting bodies called as white beech mushrooms or yulong mushrooms. Although the yield of factory production is improved year by year, partial strains still have the problems of long cultivation period, low yield per unit, poor appearance uniformity of single fruiting body, easy occurrence of cap formation and the like, and the defects can cause the increase of production cost and reduce the market competitiveness of products. On the other hand, the strain diversity of the hypsizigus marmoreus factory production strain is not high, the product appearance is similar, and the diversified demands of market consumers cannot be met. The method has rich wild and natural culture resources of the hypsizigus marmoreus, efficiently utilizes the high-quality resources, expands the genetic basis of the strains, and is beneficial to breeding the high-yield, high-quality and special hypsizigus marmoreus strains in China.

With the promulgation and implementation of the protection law of new species of international plants, the establishment of a mature, rapid and accurate molecular biology identification technical system becomes a powerful means for protecting the intellectual property rights of edible fungus varieties.

Disclosure of Invention

The invention aims to solve the technical problem of providing an SSR marker fingerprint of hypsizigus marmoreus HM21 strain and a construction method and application thereof.

Hypsizigus marmoreus (Hypsizygusgurmoreus) HM21 was deposited at Guangdong province microbial culture collection center at 12/2/2020, and was assigned to Zhou 100 Mr. 59 th building 5, guangdong province institute of microbiology, with the collection number GDMCC No. 61414.

The SSR marker fingerprint of hypsizigus marmoreus HM21 strain of the invention consists of 6 pairs of SSR markers, is an SSR primer developed based on hypsizigus marmoreus genome simple repetitive sequence fragments, has good amplification band type and high repeatability, and has detailed marker information shown in a table 1:

TABLE 1 SSR tag detailed information List

The invention relates to a method for constructing an SSR marker fingerprint spectrum of hypsizigus marmoreus HM21 strain, which comprises the following steps:

(1) Hypha culture: inoculating Hypsizigus marmoreus strain to potato glucose agar solid culture medium, culturing at 22 deg.C for 10-14d, and collecting mycelium;

(2) Extraction of genomic DNA: the fungal DNA extraction kit is used, the genomic DNA is extracted according to the kit experimental steps, and 2 mu L of DNA is taken for carrying out 1.2% agarose gel electrophoresis detection. Detecting the concentration and purity of the total genome DNA by an ultraviolet spectrophotometry, and adjusting the concentration of the sample DNA to be consistent;

(3) SSR molecular marker primer development: selecting a polymorphic sequence to design an SSR primer and synthesizing according to the genome re-sequencing result of the hypsizigus marmoreus strain;

(4) Detection of SSR molecular markers: carrying out PCR amplification of gene SSR markers on the extracted DNA;

(5) And (3) electrophoresis detection: mixing the product obtained by PCR amplification with formamide sample adding buffer solution, denaturing, and detecting on a machine;

(6) GeneMapper data analysis.

The method for constructing the SSR marker fingerprint spectrum of the hypsizigus marmoreus HM21 strain is characterized by comprising the following steps of: the step (2) of extracting the genome DNA comprises the following specific steps:

(1) Adding a fungus sample into liquid nitrogen for fully grinding;

(2) Adding 360 mu LBuffersSTE and 40 mu L Buffer SDS into the ground powder rapidly, quickly swirling and mixing uniformly, placing the centrifugal tube in a water bath at 65 ℃ for 15min, and reversing the centrifugal tube in the water bath process to mix the sample for a plurality of times;

(3) Adding 5 mu L of RNase Solution into the lysate, uniformly mixing by vortex, and standing for 15-30min at room temperature;

(4) Adding 140 mu L of Buffer PS, vortexing and shaking for 30s, and standing on ice for 10min;

(5) 13000g was centrifuged for 5min at room temperature, and 400. Mu.L of the supernatant was carefully transferred to a new centrifuge tube;

(6) Adding 600 mu L of Buffer PBD into the sample, and uniformly mixing by vortex for 30s;

(7) Loading the DNA binding column in a collecting tube, transferring half of the mixed solution to the column, and centrifuging at 8000g for 1min;

(8) Pouring off the filtrate, loading the column back into the collecting pipe, transferring the rest mixed solution into the column, and centrifuging at 8000g for 1min;

(9) Pouring the filtrate and putting the column back into the collecting pipe, adding 600 mu L of Buffer GW2 into the column, and centrifuging for 1min at 8000 g;

(10) Repeating the step 9;

(11) Pouring off the filtrate, putting the column back into the collecting pipe, centrifuging at 10000g for 2min to remove the residual ethanol in the column;

(12) Transferring the column to a new 1.5mL centrifuge tube, adding 30. Mu.L of Buffer AE preheated to 65 ℃ to the center of the membrane of the column, standing at room temperature for 2min, and centrifuging at 10000g for 1min;

(13) mu.L of DNA was subjected to 1.2% agarose gel electrophoresis, 2. Mu.L of DNA was subjected to NanoDrop spectrophotometry, and the remaining DNA was stored at-20 ℃.

The PCR amplification system in the step (3) is as follows: total volume 10 μ Ι _, comprising: 10 XPCR buffer1 uL, 2.5mmol/L dNTP 0.8 uL, 5U/uL TAKARA HSTaq enzyme 0.1 uL, 5 umol/L TP-M130.5 uL, 5 umol/L SSR mark specific primer total volume each 0.6 uL, concentration 20 ng-30 ng/uL extracted template DNA 1.2 uL, ddH ₂ O 5.2μL；

And (3) PCR reaction conditions: 5min at 95 ℃; 30s at 95 ℃, 30s at 59 ℃, 30s at 72 ℃ and 30 cycles; 5min at 95 ℃; 30s at 95 ℃, 30s at 53 ℃, 30s at 72 ℃ and 10 cycles; 30min at 60 ℃.

The sample adding buffer solution in the step (5) is 9 mu L of a molecular weight internal standard and formamide mixed solution (0.5; the amount of the PCR amplification product added was 1. Mu.L.

The specific process of denaturation in the step (5) is to denature at 95 ℃ for 3min, and then to cool in an ice-water mixture for 3min.

The electrophoresis in the step (5) has the following process parameters: the modified polyacrylamide gel is commercial POP7 gel, the electrophoresis buffer solution is 3730buffer EDTA, the injection voltage is 2000V, the operation voltage is 15000V, the sample injection time is 10s, the temperature is 60 ℃, the capillary length is 50cm, the power is 200W, the electrophoresis is performed for 20min, and the current and the power are dynamic.

The data analysis in the step (6) specifically comprises the following steps: and (3) importing the detected original data file into analysis software GeneMapper ID3.2, and performing group structure analysis, clustering and heterozygosity analysis and core germplasm resource calculation analysis by using software such as POPGENE, NTSYS and the like. Allele factors (Na, ne), nei's genetic diversity index (He), shannon's diversity information index (I) and gene observation heterozygosity (Ho) were analyzed.

TABLE 2 summary of allelic fragment information from SSR primer amplification

The invention relates to application of an SSR (simple sequence repeat) marker fingerprint of hypsizygus marmoreus HM21 strain, which is characterized in that 6 pairs of SSR primers developed by utilizing hypsizygus marmoreus genome simple repeated sequence segments are used for screening a large number of SSR primers, the number of allelic segments amplified by the 6 pairs of SSR primers in each hypsizygus marmoreus cultivated variety is determined and numbered (table 2) by performing banding amplification on the collected SSR primers of 56 main hypsizygus marmoreus cultivated varieties, and the HM21 strain can be effectively identified in the collected 56 main cultivated varieties by the combination of the numbers of different SSR allelic sites. The relative molecular weight of the amplified allelic locus of each SSR primer can be determined by analyzing by capillary electrophoresis combined software, the strain with the specific SSR allelic fragment combination of the strain HM21 is the hypsizigus marmoreus strain HM21, and the numbering combination of the strain is as follows: 2/9/(2+3)/(3+4)/(3+6)/(1+6).

The invention has the beneficial effects that: compared with conventional morphological detection, antagonism test and fruiting test, the method has the advantages of short detection time, high accuracy and good repeatability. The detection time only needs 3 days, the conventional antagonism test needs at least two weeks, and the fruiting test needs at least 3 months; the method has the specificity of 'HM 21' strains in the collected 56 commercial hypsizigus marmoreus main culture strains, and has good application prospect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

FIG. 1 is a diagram of allelic site relative molecular weight peaks respectively obtained by sequential detection of a primer HMSSR3 in a selected hypsizigus marmoreus cultivation material HM21 and several main cultivation commercial varieties;

FIG. 2 is a diagram showing the relative molecular weight peaks of the allelic sites obtained by sequentially detecting the primer HMSSR5 in the selected hypsizigus marmoreus cultivation material HM21 and several main cultivation commercial varieties respectively;

FIG. 3 is a diagram of the peak of the relative molecular weight of the allelic site obtained by the primer HMSSR11 respectively and sequentially detected in the selected hypsizigus marmoreus cultivation material HM21 and several main cultivation commercial varieties;

FIG. 4 is a diagram of the peak of the relative molecular weight of the allelic site obtained by the primer HMSSR18 respectively and sequentially detected in the selected hypsizigus marmoreus cultivation material HM21 and several main cultivation commercial varieties;

FIG. 5 is a diagram showing the relative molecular weight peaks of the allelic sites sequentially detected by the primer HMSSR47 in the selected Hypsizygus marmoreus cultivation material "HM21" and several main cultivation commercial varieties, respectively;

FIG. 6 is a diagram of the peak of the relative molecular weight of the allelic site obtained by the primer HMSSR59 in the selected hypsizigus marmoreus cultivation material HM21 and several main cultivation commercial varieties in turn.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and it will be appreciated by those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the present invention and that the present invention is not limited by the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1:

(1) Hypha culture: inoculating Hypsizigus marmoreus strain to potato glucose agar solid culture medium, culturing at 22 deg.C for 10d, and collecting mycelium;

(2) Extraction of genomic DNA: the fungal DNA extraction kit is used, the genomic DNA is extracted according to the kit experimental steps, and 2 mu L of DNA is taken for carrying out 1.2% agarose gel electrophoresis detection. Detecting the concentration and purity of the total genome DNA by an ultraviolet spectrophotometry, and adjusting the concentration of the sample DNA to be consistent;

the CTAB method for extracting genome DNA of hyphae comprises the following steps:

(1) adding a fungus sample into liquid nitrogen for fully grinding;

(2) adding 360 mu L of Buffer STE and 40 mu L of Buffer SDS into the ground powder quickly, quickly whirling and uniformly mixing, placing the centrifuge tube in a water bath at 65 ℃ for 15min, and reversing the centrifuge tube in the water bath process to mix the sample for a plurality of times;

(3) adding 5 mu L of RNase Solution into the lysate, uniformly mixing by vortex, and standing for 15-30min at room temperature;

(4) adding 140 mu L of Buffer PS, vortexing and shaking for 30s, and standing on ice for 10min;

(5) 13000g was centrifuged for 5min at room temperature, and 400. Mu.L of the supernatant was carefully transferred to a new centrifuge tube;

(6) add 600. Mu.L Buffer PBD (diluted with absolute ethanol) to the sample, vortex and mix for 30s;

(7) loading the DNA binding column in a collecting tube, transferring half of the mixed solution to the column, and centrifuging at 8000g for 1min;

(8) pouring off the filtrate, putting the column back into the collecting pipe, transferring the residual mixed solution into the column, and centrifuging for 1min at 8000 g;

(9) pouring off the filtrate, putting the column back into the collecting pipe, adding 600. Mu.L Buffer GW2 (diluted with absolute ethyl alcohol) into the column, and centrifuging at 8000g for 1min;

r repeats step 9;

pouring off the filtrate, putting the column back into the collecting pipe, centrifuging at 10000g for 2min to remove the residual ethanol in the column;

transferring the column to a new 1.5mL centrifuge tube, adding 30. Mu.L of Buffer AE preheated to 65 ℃ to the center of the membrane of the column, standing at room temperature for 2min, and centrifuging at 10000g for 1min;

2 μ L of DNA was taken up to 1.2%Agarose gel electrophoresis detection, 2. Mu.L of DNA was used for NanoDrop spectrophotometry, and the remaining DNA was stored at-20 ℃.

(3) Detection of SSR molecular markers: carrying out PCR amplification of gene SSR markers on the extracted DNA;

the PCR amplification system is as follows: total volume 10 μ L, including: 10 XPCR buffer1 uL, 2.5mmol/L dNTP 0.8 uL, 5U/uL TAKARA HSTaq enzyme 0.1 uL, 5 umol/L TP-M130.5 uL, 5 umol/L SSR mark specific primer total volume 0.6 uL respectively, concentration 20 ng-30 ng/uL extracted template DNA 1.2 uL, ddH ₂ O 5.2μL；

And (3) PCR reaction conditions: 5min at 95 ℃; 30s at 95 ℃, 30s at 59 ℃, 30s at 72 ℃ and 30 cycles; 5min at 95 ℃; 30s at 95 ℃, 30s at 53 ℃, 30s at 72 ℃ and 10 cycles; 30min at 60 ℃. (4) electrophoretic detection: mixing 1 μ L of the product obtained by PCR amplification with 9 μ L of sample buffer solution, denaturing at 95 deg.C for 3min, and cooling in ice water mixture for 3min; 3 mu L of sample is applied to a modified polyacrylamide gel for electrophoresis, the modified polyacrylamide gel is commercial POP7 gel, the electrophoresis buffer solution is 3730buffer EDTA, the injection voltage is 2000V, the operation voltage is 15000V, the sample injection time is 10s, the temperature is 60 ℃, the length of a capillary is 50cm, the power is 200W, the electrophoresis is 20min, the current and the power are dynamic,

(5) Analysis of results

Adopting 6 pairs of SSR primers to carry out PCR amplification and capillary electrophoresis on hypsizigus marmoreus strains, and finding a matched numbering combination by analyzing allele factors (Na, ne), nei's genetic diversity index (He), shannon's diversity information index (I) and gene observation heterozygosity (Ho) and combining relative molecular weight peak maps of allele sites: HMSSR3, HMSSR5, HMSSR11, HMSSR18, HMSSR47, HMSSR59, the respective banding patterns being: 2/9/(2 + 3)/(3 + 4)/(3 + 6)/(1 + 6), and the strain is the hypsizigus marmoreus "HM21" strain. To ensure the accuracy of the identification, three replicates were recommended.

Taking several main commercial varieties as examples, the peak patterns of the relative molecular weights of the allelic sites obtained by sequential detection of 6 pairs of primers are shown in FIGS. 1-6 (sequentially (1 HM21 (2); K (3); B2 (4); 15-X2 (5); 14-X1 (6); 13-X6 (7); H2 (8); BS027 (9); X5 r DTG)

B4)。

The fingerprint spectrum of the invention refers to the combination of the primer and the band type thereof.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

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Claims (2)

1. A fingerprint identification method of an SSR marker of hypsizigus marmoreus HM21 strain is characterized by comprising the following steps: the fingerprint consists of 6 SSR marker loci, and the specific sequences of 6 pairs of corresponding primers are as follows:

HMSSR3 forward primer: GCGAAACCATATTCATGCGT;

reverse primer: ATTACTTGTTCGTCGGCAGGA;

HMSSR5 forward primer: CACACCTTACGAGGTGAGCA;

reverse primer: tgtttgtgttagccgaacg;

HMSSR11 forward primer: GGAGTTTGAGTGAGGCAGC;

reverse primer: ATGAACCAGACCAAAGACCG;

HMSSR18 forward primer: GAGGATTAAGGGGACTGTCG;

reverse primer: CCTCATCTCCCGACTCTACG;

HMSSR47 forward primer: TCTCATGGAACGACCTGGAG;

reverse primer: TCCAAATCCAGACTTCGC;

HMSSR59 forward primer: cactgttccagagatgggacc;

reverse primer: AGGGCCTTTTCAGAGACGAT;

the corresponding combination of the belt type numbers is as follows: 2/9/(2 + 3)/(3 + 4)/(3 + 6)/(1 + 6);

the corresponding band type number of the primer HMSSR3 is 2, and the corresponding allelic gene fragment has the band size of 141 to 141.99bp;

the corresponding band type number of the primer HMSSR5 is 9, and the band size of the corresponding allele segment is 207-207.99bp;

the band type number corresponding to the primer HMSSR11 is 2+3, wherein the band size of the allele segment corresponding to the number 2 is 266 to 266.99bp, and the band size of the allele segment corresponding to the number 3 is 273 to 273.99bp;

the banding pattern corresponding to the primer HMSSR18 is numbered 3+4, wherein the banding size of the allelic gene segment corresponding to the numbering 3 is 257 to 257.99bp, and the banding size of the allelic gene segment corresponding to the numbering 4 is 262 to 262.99bp;

the band type number corresponding to the primer HMSSR47 is 3+6, wherein the band size of the allele segment corresponding to the number 3 is 144 to 144.99bp, and the band size of the allele segment corresponding to the number 6 is 155 to 155.99bp;

the band type number corresponding to the primer HMSSR59 is 1+6, wherein the size of the band of the allele segment corresponding to the number 1 is 144 to 144.99bp, and the size of the band of the allele segment corresponding to the number 6 is 174 to 174.99bp; the preservation number of the hypsizigus marmoreus HM21 strain is GDMCCNo:61414.

2. The use of the SSR-labeled fingerprint of the hypsizigus marmoreus HM21 strain according to claim 1, which is characterized in that: the SSR-labeled fingerprint spectrum of the hypsizigus marmoreus HM21 strain is used for identifying the specific allelic variation of the hypsizigus marmoreus HM21 strain and/or identifying the specificity of the hypsizigus marmoreus HM21 strain.

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