CN109762918B - Characteristic sequence, primer and method for identifying polygonatum longstem and polygonatum cyrtonema - Google Patents
Characteristic sequence, primer and method for identifying polygonatum longstem and polygonatum cyrtonema Download PDFInfo
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Abstract
The invention relates to a method for identifying characteristic sequences and specific labeled primers of Polygonatum longstem (Polygonatum filipe) and Polygonatum cyrtonema and a rapid identification method. The characteristic sequence is shown as SEQ ID NO.1, and the primer sequences are as follows: an upstream primer CG _ Fb: 5'-GACTGCGTACGAATTGTCGAT-3' downstream primer CG _ Rb: 5'-AAACCGGTAGCCTTGAACG-3' are provided. The characteristic sequence and molecular specificity marker primer of the invention can rapidly identify polygonatum longstem and polygonatum cyrtonema, the method is simple, rapid and accurate, and is a molecular means which can not be replaced by apparent characteristic identification of polygonatum longstem and polygonatum cyrtonema.
Description
(I) technical field
The invention relates to a primer for identifying characteristic sequences and specificity markers of Polygonatum longstem (Polygonatum filipe) and Polygonatum cyrtonema and a method for accurately distinguishing the Polygonatum cyrtonema and the Polygonatum cyrtonema by using the primer.
(II) background of the invention
Huang Jing is recorded in Ming Yi Bie Lu (miscellaneous records of famous physicians), sweet in nature and flavor, neutral in nature and entering spleen, lung and kidney meridians. The traditional Chinese medicine composition has certain clinical effects on treating tiredness and hypodynamia, spleen and stomach qi deficiency, kidney deficiency and loss, lung deficiency and dry cough, internal heat and thirst quenching, essence and blood deficiency, early white beard and hair, dry mouth and little food and the like, is called as the 'blood and qi tonifying king', can be used for treating diseases such as pulmonary tuberculosis, diabetes, chronic hepatitis and the like, and has the effects of resisting tumors, resisting radiation and the like. The underground rhizome tubers of the sealwort are rich in polysaccharide, saponin, amino acid, alkaloid, trace elements and the like, and have high medicinal value and edible value. In addition, the sealwort can be developed and utilized as an ornamental plant. Therefore, the sealwort has huge development potential and wide market prospect.
Sealwort (p.filipe) and polygonatum cyrtonema (p.cyrtonema) belong to perennial herbaceous plants of polygonatum of liliaceae, have similarity in morphology, and usually people use morphological characteristics such as length-width ratio of sealwort leaves, whether short hair exists on leaf backs, length of pedicel, and whether upper ends of filaments are expanded as a basis for judgment. Due to the influence of factors such as growth environment, climate conditions, soil nutrients and growth age, morphological characteristics of the same polygonatum grown in different regions have certain differences, so that morphological identification is often lack of accuracy. In addition, the rhizoma polygonati tubers are used as main materials of homology of medicine and food, are nodular or beaded and expanded, have extremely similar microscopic characteristics and are difficult to directly identify. Meanwhile, polygonatum cyrtonema is brought into the Chinese pharmacopoeia as one of the basic source plants for medicinal polygonatum, and polygonatum longstem is not listed in the polygonatum cyrtonema, so that the phenomenon of confusing polygonatum longstem into polygonatum cyrtonema in the market easily occurs, and certain hidden dangers are brought to the market order, medicinal safety and the like of polygonatum cyrtonema. Therefore, in order to distinguish two polygonatum medicinal materials from different sources, research on an identification method of the polygonatum medicinal materials is necessary.
At present, RAPD (Random Amplified Polymorphic DNA) and ISSR (Inter-Simple Sequence Repeat polymorphism) molecular marker technologies have been used for genetic relationship research, germplasm resource identification and genetic diversity analysis of Polygonatum plants. These molecular marking techniques all adopt universal primers, require a large amount of primer screening, and have many PCR amplification map bands, poor repeatability and low specificity. Therefore, only the development of reliable and stable species-specific DNA fingerprints can be used for accurate and rapid identification among different species of the sealwort.
Disclosure of the invention
The invention aims to provide a marker primer capable of identifying characteristic sequences and molecular specificity of polygonatum longum and polygonatum cyrtonema and a method for quickly identifying the two different polygonatum cyrtonema by using the primer.
The technical scheme adopted by the invention is as follows:
identifying characteristic sequences of Polygonatum longstem (Polygonatum filipe) and Polygonatum cyrtonema (Polygonatum cyrtonema), wherein the sequences are as follows:
5′-GACTGCGTACGAATTGTCGATAGTATTTCCTTGCACTTACTGTTATTACTCCACGTGCTTCACTACACTCCTGTTACAACACATGAACTCTTATACTATTCATTATAACATTGACCTGTCACTGCCATTTATTTCTCTCTAGTCTTTATGAACTTTGTTCTACCTCTACTAGTCCCAATGGACCGTGCCGCTTAAGGCTACTAGGCATATTGGATATCGCTATCCATTTATACTGGTTCCCTTAGATTGCTTCGTTCCATTTCTACTAGTTCTCGTAGTCTCTGTTGCATTTCCACTAGCCCTCATGAACTCGTTCCATCTCTGCTAGTCCTAATGGACTTTGTCGTCCAAGGCTACTAGTCTTGTTGGATAGGCCATCCATTCGACTAGTCTCCATTGGGTTGCTTAGTTCATTTCTACTAGTCCTCTTGTACTTGAACCCACTTCAACTAGTCCTTATAGGCTTAGGACCATCTCCACTAGTTCCAGTGGACTTTGTCGTTCAAGGCTACCGGTTT-3′。
the molecular specificity marker primers for identifying polygonatum longstem and polygonatum cyrtonema have the following sequences:
an upstream primer CG _ Fb: 5'-GACTGCGTACGAATTGTCGAT-3' the flow of the air in the air conditioner,
a downstream primer CG _ Rb: 5'-AAACCGGTAGCCTTGAACG-3' are provided.
The primer pair is characterized in that ISSR molecular marker technology is adopted, after a large number of specific DNA fragments (SEQ ID No.1) of polygonatum longipedunculatum are obtained through PCR amplification and screening, the fragments are cloned and sequenced, specific primers of the specific DNA fragments are designed on the basis of DNA sequences, PCR amplification is carried out on polygonatum pedunculatum and polygonatum cyrtonema through the specific primers, only polygonatum pedunculatum can stably obtain specific fragments with the size of 518bp, and polygonatum cyrtonema cannot obtain the specific fragments.
The invention also relates to a method for rapidly identifying polygonatum longstem and polygonatum cyrtonema by using the molecular specificity marker primer, which comprises the following steps: extracting genome DNA of a polygonatum sample to be detected as a template, taking the molecular specific marker primer as an amplification primer, carrying out PCR amplification, carrying out electrophoresis detection on an amplification product, wherein if a DNA band of about 518bp appears in an electrophoresis result, the polygonatum sample to be detected is polygonatum longstem, and if the DNA band of about 518bp does not appear in the electrophoresis result, the polygonatum sample to be detected is polygonatum cyrtonema; the sequence of the molecular specific marker primer is as follows:
an upstream primer CG _ Fb: 5'-GACTGCGTACGAATTGTCGAT-3'
A downstream primer CG _ Rb: 5'-AAACCGGTAGCCTTGAACG-3' are provided.
The method is characterized in that the selection of an amplification primer, the DNA extraction, the determination of a PCR reaction system and reaction conditions and the electrophoresis detection can be carried out according to the conventional method in the field.
It should be noted that the molecular specific marker primers of the present invention are only limited to the identification of polygonatum longum and polygonatum cyrtonema, i.e., the samples to be tested are only limited to polygonatum longum and polygonatum cyrtonema, and those skilled in the art can first make a preliminary judgment according to the morphological characteristics of the plants or tubers of polygonatum cyrtonema, and then identify the samples which are judged to be probably polygonatum longum or polygonatum cyrtonema by the method of the present invention.
The PCR amplification conditions may be as follows: pre-denaturation at 94 deg.C for 6 min; denaturation at 94 ℃ for 30s, annealing at 55.7 ℃ for 45s, and extension at 72 ℃ for 1.5min for 30 cycles; finally, the temperature is leveled off at 72 ℃ for 7min, and the termination temperature is 4 ℃.
Specifically, the method comprises the following steps:
(1) cleaning tubers of a polygonatum sibiricum sample to be detected, slicing, drying by silica gel, adding a proper amount of liquid nitrogen, grinding, and extracting genome DNA of the tubers of the polygonatum sibiricum sample to be detected;
(2) detecting the purity and concentration of nucleic acid, OD260/OD280>1.8 for subsequent PCR amplification and dilution of genomic DNA concentration to 20 ng/. mu.L for subsequent detection;
(3) and (3) performing PCR amplification by using the genomic DNA diluted in the step (2) as a template and the molecular specific marker primer as an amplification primer:
the composition of each 20. mu.L of the PCR reaction system was as follows:
2×Power Taq PCR Master Mix 10μL
10 μ M of each of the upstream and downstream primers 1.5 μ L
20 ng/. mu.L template DNA 3. mu.L
ddH2O is complemented to 20 mu L;
the PCR reaction conditions were as follows:
pre-denaturation at 94 deg.C for 6 min; denaturation at 94 ℃ for 30s, annealing at 55.7 ℃ for 45s, and extension at 72 ℃ for 1.5min for 30 cycles; finally, filling for 7min at 72 ℃, wherein the termination temperature is 4 ℃;
(4) taking 4 mu L of the amplification product obtained in the step (3), spotting the amplification product on 1.5% agarose gel, carrying out electrophoresis in 1 XTAE buffer solution for 40min (50-100 mA, 120V), and then taking a picture on an automatic gel image analyzer; if the electrophoresis result shows a DNA band of 518bp, the sample to be detected is polygonatum longstem; if the electrophoresis result does not have a DNA band of 518bp, the sample to be detected is polygonatum cyrtonema.
The invention has the following beneficial effects: the molecular specificity marker primer can be used for identifying the polygonatum longstem and polygonatum cyrtonema plants or tubers, and the method is simple, quick and accurate. Although the polygonatum longstem and polygonatum cyrtonema have certain difference in morphological characteristics of plant leaves, the morphological difference of tubers is not obvious, and the polygonatum cyrtonema uses tubers as important medicinal and edible materials, so that the polygonatum longstem tubers are easily mistaken to be polygonatum cyrtonema. The method can be used for quickly identifying the molecular of the tuber of polygonatum longstem and polygonatum cyrtonema, is simple, quick and accurate, and is an effective assistant for morphological feature identification.
(IV) description of the drawings
FIG. 1 shows the results of PCR amplification of Polygonatum sibiricum and Polygonatum cyrtonema; m is DNA molecular weight standard; the number of 1-10 is polygonatum longstem, and a specific DNA strip with the fragment size of 518bp is amplified; 11-20 is numbered polygonatum cyrtonema, and no specific DNA band with the size of 518bp is generated.
(V) detailed description of the preferred embodiments
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto:
example 1:
(1) extracting genome DNA of two sealwort:
washing tubers of a polygonatum sibiricum sample to be detected, slicing, drying silica gel (not less than 7d), taking 0.03g of the tuber, adding liquid nitrogen to the tuber, completely grinding, and extracting the genomic DNA by adopting a novel rapid plant genomic DNA kit (DP3112, BioTeke, Beijing Baitaike biotechnology limited) according to the instruction operation to obtain the genomic DNA of the sample.
(2) The obtained genomic DNA was checked for integrity, purity and concentration by 1.5% agarose gel electrophoresis and DNA/RNA ultraviolet spectrophotometer (Nanodrop Technologies, USA). OD260/OD280>1.8 DNA samples were used for subsequent PCR amplification and appropriate dilutions were made according to nucleic acid concentration values to give a genomic DNA concentration of about 20 ng/uL. The DNA extract was stored at-20 ℃ in a refrigerator for further use.
(3) Designing specific PCR amplification primers, wherein the sequences of the primer pairs are as follows:
an upstream primer CG _ Fb: 5'-GACTGCGTACGAATTGTCGAT-3'
A downstream primer CG _ Rb: 5'-AAACCGGTAGCCTTGAACG-3'
The primer is synthesized by Hangzhou Zhikexi biotechnology limited.
(4) And (3) performing PCR amplification by using the genomic DNA diluted to 20 ng/. mu.L in the step (2) as a template and 891-F2/R1 as an amplification primer pair, wherein the size of the target fragment is 518 bp.
The PCR amplification reaction system comprises the following components (the total volume is 20 mu L):
the PCR reaction conditions were as follows:
pre-denaturation at 94 deg.C for 6 min; denaturation at 94 ℃ for 30s, annealing at 55.5 ℃ for 45s, and extension at 72 ℃ for 1.5min for 35 cycles; finally, the temperature is leveled off at 72 ℃ for 7min, and the termination temperature is 4 ℃.
(5) And (3) taking 4 mu L of the amplification product obtained in the step (4), spotting the amplification product on 1.5% agarose gel, carrying out electrophoresis in 1 XTAE buffer solution for 40min (50-100 mA, 120V), and then taking pictures on a Bio-Rad gel imaging system.
The primer is synthesized by Hangzhou Ongke catalpi Biotechnology limited company, and the amplification reaction is carried out on a LifeECO gene amplification instrument of Hangzhou Bori company.
According to the above method, 10 portions of polygonatum kingianum and polygonatum cyrtonema tuber samples from the areas of thoroughfare city and lishui city, Zhejiang province were subjected to PCR amplification and electrophoresis detection, and the details of the samples are shown in Table 1, and the results are shown in FIG. 1.
Table 1: sample list
| Serial number | Sample source | Seed name |
| 1 | Zhejiang province-Lishui city-Songyang county-Yuyanzhen | P.filipe |
| 2 | Zhejiang province-Lishui city-Songyang county-Yuyanzhen | P.filipe |
| 3 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.filipe |
| 4 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.filipe |
| 5 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.filipe |
| 6 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.filipe |
| 7 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.filipe |
| 8 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.filipe |
| 9 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.filipe |
| 10 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.filipe |
| 11 | Zhejiang province-Lishui city-Songyang county-double children town | P.cyrtonema |
| 12 | Zhejiang province-Lishui city-Songyang county-double children town | P.cyrtonema |
| 13 | Zhejiang province-Lishui city-Songyang county-double children town | P.cyrtonema |
| 14 | Zhejiang province-Lishui city-Songyang county-double children town | P.cyrtonema |
| 15 | Zhejiang province-Lishui city-Songyang county-Yuyanzhen | P.cyrtonema |
| 16 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.cyrtonema |
| 17 | Zhejiang province-thoroughfare city-Kaihua county-Sound pit county | P.cyrtonema |
| 18 | Zhejiang province-thoroughfare city-thoroughfare Jiangqu district-Longshan village | P.cyrtonema |
| 19 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.cyrtonema |
| 20 | Zhejiang province-Jiangshan city-Baoan-Hua Longxi village | P.cyrtonema |
As can be seen from the figure, a clear, bright and stable specific DNA band with the molecular weight of about 518bp is amplified in all samples of polygonatum longipedunculatum (P.filipe), while the samples of polygonatum cyrtonema (P.cyrtonema) do not have the generation of a specific DNA band with the size of 518bp and other non-target bands, so that the molecular specific marker primer developed by the invention is used for identifying polygonatum cyrtonema (P.cyrtonema), and has very high stability and specificity.
Sequence listing
<110> scientific institute of forestry in Zhejiang province
Quzhou Forestry Technology Extension Station
<120> characteristic sequences, primers and method for identifying polygonatum longstem and polygonatum cyrtonema
<160> 3
<170> SIPOSequenceListing 1.0
<210> 1
<211> 518
<212> DNA
<213> Polygonatum filipe
<400> 1
gactgcgtac gaattgtcga tagtatttcc ttgcacttac tgttattact ccacgtgctt 60
cactacactc ctgttacaac acatgaactc ttatactatt cattataaca ttgacctgtc 120
actgccattt atttctctct agtctttatg aactttgttc tacctctact agtcccaatg 180
gaccgtgccg cttaaggcta ctaggcatat tggatatcgc tatccattta tactggttcc 240
cttagattgc ttcgttccat ttctactagt tctcgtagtc tctgttgcat ttccactagc 300
cctcatgaac tcgttccatc tctgctagtc ctaatggact ttgtcgtcca aggctactag 360
tcttgttgga taggccatcc attcgactag tctccattgg gttgcttagt tcatttctac 420
tagtcctctt gtacttgaac ccacttcaac tagtccttat aggcttagga ccatctccac 480
tagttccagt ggactttgtc gttcaaggct accggttt 518
<210> 2
<211> 21
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 2
gactgcgtac gaattgtcga t 21
<210> 3
<211> 19
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 3
Claims (3)
1. The molecular specificity marker primers for identifying polygonatum longstem and polygonatum cyrtonema have the following sequences:
an upstream primer CG _ Fb: 5'-GACTGCGTACGAATTGTCGAT-3' the flow of the air in the air conditioner,
a downstream primer CG _ Rb: 5'-AAACCGGTAGCCTTGAACG-3' are provided.
2. A method for rapidly distinguishing polygonatum longipedunculatum from polygonatum cyrtonema by using the molecular specific marker primer of claim 1, which comprises the following steps: extracting genome DNA of a polygonatum sample to be detected as a template, taking the molecular specificity marker primer as an amplification primer, carrying out PCR amplification, carrying out electrophoresis detection on an amplification product, wherein if a 518bp DNA strip appears in an electrophoresis result, the polygonatum sample to be detected is polygonatum longstem, and if the 518bp DNA strip does not appear in the electrophoresis result, the polygonatum sample to be detected is polygonatum cyrtonema; the sequence of the molecular specific marker primer is as follows:
an upstream primer CG _ Fb: 5'-GACTGCGTACGAATTGTCGAT-3' the flow of the air in the air conditioner,
a downstream primer CG _ Rb: 5'-AAACCGGTAGCCTTGAACG-3', respectively;
the PCR amplification conditions were as follows: pre-denaturation at 94 deg.C for 6 min; denaturation at 94 ℃ for 30s, annealing at 55.7 ℃ for 45s, and extension at 72 ℃ for 1.5min for 30 cycles; finally, the temperature is leveled off at 72 ℃ for 7min, and the termination temperature is 4 ℃.
3. The method of claim 2, characterized in that the method is as follows:
(1) cleaning tubers of a polygonatum sibiricum sample to be detected, slicing, drying by silica gel, adding a proper amount of liquid nitrogen, grinding, and extracting genome DNA of the tubers of the polygonatum sibiricum sample to be detected;
(2) detecting the purity and concentration of nucleic acid, OD260/OD280>1.8 DNA samples for post-treatmentCarrying out PCR amplification, and diluting the concentration of the genome DNA to be 20 ng/mu L for subsequent detection;
(3) and (3) performing PCR amplification by using the genomic DNA diluted in the step (2) as a template and the molecular specific marker primer as an amplification primer:
the composition of each 20. mu.L of the PCR reaction system was as follows:
2×Power Taq PCR Master Mix 10 μL，
10 mu M of each of the upstream and downstream primers is 1.5. mu.L,
20 ng/. mu.L of template DNA 3. mu.L,
ddH2o is complemented to 20 mu L;
the PCR reaction conditions were as follows:
pre-denaturation at 94 deg.C for 6 min; denaturation at 94 ℃ for 30s, annealing at 55.7 ℃ for 45s, and extension at 72 ℃ for 1.5min for 30 cycles; finally, filling for 7min at 72 ℃, wherein the termination temperature is 4 ℃;
(4) taking 4 mu L of the amplification product in the step (3), spotting the amplification product on 1.5% agarose gel, carrying out electrophoresis in 1 XTAE buffer solution for 40min, and then taking a picture on an automatic gel image analyzer; if the electrophoresis result shows a DNA band of 518bp, the sample to be detected is polygonatum longipedunculatum, and if the electrophoresis result does not show a DNA band of 518bp, the sample to be detected is polygonatum cyrtonema.
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| CN101654708A (en) * | 2009-09-21 | 2010-02-24 | 安徽师范大学 | Polygonatum filipes microsatellite markers |
| CN104894124A (en) * | 2015-06-19 | 2015-09-09 | 苏州市种子管理站 | ISSR-SCAR (inter simple sequence repeat-sequence characterized amplified region) marker capable of identifying Wujiang brassica chinensis and identification method of marker |
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| CN101654708A (en) * | 2009-09-21 | 2010-02-24 | 安徽师范大学 | Polygonatum filipes microsatellite markers |
| CN104894124A (en) * | 2015-06-19 | 2015-09-09 | 苏州市种子管理站 | ISSR-SCAR (inter simple sequence repeat-sequence characterized amplified region) marker capable of identifying Wujiang brassica chinensis and identification method of marker |
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| 基于ISSR标记的福建省多花黄精与长梗黄精种质鉴别及遗传多样性分析;徐慧龙等;《福建农业学报》;20170630;第32卷(第6期);第621页 * |
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