CN113046459A - Flanking sequence of GhFPF1 gene-transferred cotton insertion site and specificity identification method thereof - Google Patents

Abstract

Translated fromChinese

本发明公开了一种转GhFPF1基因棉花插入位点的侧翼序列及其特异性鉴定方法，属于生物技术领域。该侧翼序列包括左侧翼序列和/或右侧翼序列；左侧翼序列的第1~501位点序列来源于中棉所24的基因组序列，左侧翼序列的第502~937位点序列来源于转GhFPF1基因棉花的外源插入片段序列；右侧翼序列的第1~466位点序列来源于转GhFPF1基因棉花的外源插入片段序列，右侧翼序列的第467~967位点序列来源于中棉所24的基因组序列。本发明是通过上述侧翼序列对特异性引物进行设计的，通过设计出的引物与待检测样品的PCR产物中是否含有特异性扩增条带，便可判断待检测样品中是否含有转GhFPF1基因棉花成分。The invention discloses a flanking sequence of an insertion site of GhFPF1 gene transgenic cotton and a specific identification method thereof, belonging to the field of biotechnology. The flanking sequence includes the left flanking sequence and/or the right flanking sequence; the 1st to 501st positions of the left flank sequence are derived from the genome sequence of China Cotton Research Institute 24, and the 502nd to 937th positions of the left flank sequence The sequences of exogenous inserts derived from GhFPF1 transgenic cotton; the sequences of positions 1 to 466 of the right flank sequence are derived from the sequences of exogenous inserts of GhFPF1 transgenic cotton, and the sequences of positions 467 to 967 of the right flank sequence Derived from the genome sequence of China Cotton Research Institute 24. The present invention designs specific primers based on the above-mentioned flanking sequences. Whether the designed primers and the PCR products of the samples to be detected contain specific amplification bands can determine whether the samples to be detected contain GhFPF1 gene-transformed cotton. Element.

Description

Flanking sequence of GhFPF1 gene-transferred cotton insertion site and specificity identification method thereof

Technical Field

The invention relates to the technical field of biology, in particular to a flanking sequence of a cotton insertion site of a GhFPF1 transgenic gene and a specificity identification method thereof.

Background

Cotton is one of the leading economic crops in the world, and is a raw material and an important strategic material for industries such as textile, fine chemical engineering and the like. With the development of biotechnology, transgenic technology is a new way for improving important traits of crops, and transgenic breeding has the advantages of realizing cross-species gene discovery, widening the utilization range of genetic resources, realizing the directional efficient transfer of known functional genes, enabling organisms to obtain specific traits required by human beings, and providing a new technical way for breeding new varieties of high-yield, high-quality and high-resistance agricultural organisms. The GhFPF1 gene is cloned from cotton by the Cotton institute of Chinese agricultural academy of sciences, and the cDNA sequence of the GhFPF1 gene is introduced into the Cotton institute 24 (national approval GS 08001-1997) of the cotton variety by the Agrobacterium tumefaciens mediated method, so as to obtain a transgenic cotton plant ZF 667; compared with a non-transgenic cotton variety, the GhFPF1 transgenic cotton ZF667 plant has the characteristics of obviously reduced proud bud number, increased plant height, increased single-plant boll number, increased single-boll weight and the like.

The specific detection of the transgenic event and the derived strain or variety thereof is an important technical means for realizing the effective supervision and management of the transgenic plant and ensuring the healthy development of the transgenic industry. The flanking sequence of the exogenous insertion fragment and the detection method established based on the flanking sequence are important basis for effective supervision of the transgenic plant and the product thereof. At present, although related patents and literatures report that the flanking sequence is inserted into the transgenic plant, the related articles and patent reports about the flanking sequence inserted into the GhFPF1 gene cotton are not found.

Disclosure of Invention

The embodiment of the invention aims to provide a flanking sequence of a cotton insertion site for transferring a GhFPF1 gene so as to solve the problems in the background technology.

In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

a flanking sequence of a cotton insertion site for transferring a GhFPF1 gene comprises a left flanking sequence and/or a right flanking sequence; the nucleotide sequence of the left flanking sequence is shown as a sequence table SEQ ID NO. 2, and the nucleotide sequence of the right flanking sequence is shown as a sequence table SEQ ID NO. 3; the 1 st to 501 th site sequences of the left flank sequence are derived from a genome sequence of a Zhongmian 24, and the 502 th to 937 th site sequences of the left flank sequence are derived from an exogenous insert sequence of GhFPF1 transgenic cotton; the 1 st to 466 th site sequences of the right flanking sequence are derived from the exogenous insertion fragment sequence of GhFPF1 transgenic cotton, and the 467 th to 967 th site sequences of the right flanking sequence are derived from the genome sequence of Zhongmiao 24.

Another objective of the embodiments of the present invention is to provide a primer for identifying the specificity of the flanking sequence of the cotton insertion site of the GhFPF1 gene, wherein the primer is designed according to the flanking sequence.

As a preferable embodiment of the present invention, the primer includes a first primer and/or a second primer; the first primer comprises a first forward primer designed according to the 1 st to 501 th site sequences of the left flanking sequence and a first reverse primer designed according to the 502 th to 937 th site sequences of the left flanking sequence; the second primer comprises a second forward primer designed according to the 1 st to 466 th site sequences of the right flank sequence and a second reverse primer designed according to the 467 th to 967 th site sequences of the right flank sequence.

As another preferable scheme of the embodiment of the invention, the nucleotide sequence of the first forward primer is shown as SEQ ID NO. 4 of the sequence table; the nucleotide sequence of the first reverse primer is shown as a sequence table SEQ ID NO. 5.

As another preferable scheme of the embodiment of the invention, the nucleotide sequence of the second forward primer is shown as SEQ ID NO. 6 of the sequence table; the nucleotide sequence of the second reverse primer is shown in a sequence table SEQ ID NO. 7.

Another objective of the embodiments of the present invention is to provide a kit for identifying specificity of a flanking sequence of a cotton insertion site of a transgenic GhFPF1 gene, which includes a Polymerase Chain Reaction (PCR) premix and the above primers.

Another objective of the embodiments of the present invention is to provide a method for specifically identifying a flanking sequence of a cotton insertion site of a transgenic GhFPF1 gene, comprising the following steps:

obtaining genome DNA of a sample to be detected as a DNA template;

mixing the DNA template, the PCR premix solution and the primers to obtain a PCR reaction solution;

carrying out PCR amplification reaction on the PCR reaction solution to obtain a PCR reaction product;

carrying out gel electrophoresis detection on the PCR reaction product to judge whether a specific band exists in the PCR reaction product; if a specific band exists in the PCR reaction product, the sample to be detected contains the GhFPF1 transgenic cotton component.

In another preferable embodiment of the present invention, in the step, the gel electrophoresis detection is agarose gel electrophoresis detection.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

according to the embodiment of the invention, the flanking sequence of the exogenous insertion fragment of GhFPF1 transgenic cotton is firstly determined, and the specific primer is designed according to the flanking sequence, so that whether the sample to be detected contains GhFPF1 transgenic cotton components can be judged according to whether the primer and the PCR product of the sample to be detected contain specific amplification bands, and the method can simply, conveniently and accurately detect the GhFPF1 transgenic cotton, thereby facilitating the effective supervision and management of the GhFPF1 transgenic cotton.

Drawings

FIG. 1 is a structural map of a GhFPF1 gene-transgenic cotton transformation vector pBI121-GhFPF1 provided in the embodiments of the present invention.

FIG. 2 is a diagram showing gel electrophoresis obtained in example 7 of the present invention.

FIG. 3 is a diagram showing gel electrophoresis obtained in example 8 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the apparatus and reagents used in the following examples are commercially available ones unless otherwise specified.

Example 1

This example provides flanking sequences of a cotton insertion site for transforming the GhFPF1 gene, including a left flanking sequence; the nucleotide sequence of the left flanking sequence is shown as a sequence table SEQ ID NO. 2, and the length of the left flanking sequence is 937 bp; the 1 st to 501 th site sequences of the left flank sequence are derived from the genome sequence of the Zhongmian 24, and the 502 th to 937 th site sequences of the left flank sequence are derived from the exogenous insert sequence of GhFPF1 transgenic cotton. Wherein, the left flanking sequence refers to the left border flanking sequence of the exogenous insert of GhFPF1 gene-transferred cotton.

Example 2

This example provides flanking sequences of a cotton insertion site for transforming the GhFPF1 gene, including a right flanking sequence; the nucleotide sequence of the right flanking sequence is shown as a sequence table SEQ ID NO. 3, and the length of the nucleotide sequence is 967 bp; the 1 st to 466 th site sequences of the right flanking sequence are derived from the exogenous insertion fragment sequence of GhFPF1 transgenic cotton, and the 467 th to 967 th site sequences of the right flanking sequence are derived from the genome sequence of Zhongmiao 24. Wherein, the right flank sequence refers to the right border flanking sequence of the exogenous insertion fragment of GhFPF1 gene-transferred cotton.

In addition, the method for obtaining the left flank sequence and the right flank sequence provided in theabove embodiments 1 to 2 is as follows:

(1) extracting genome DNA of GhFPF1 transgenic cotton plants: putting young and tender leaves of a GhFPF1 transgenic cotton plant into a centrifuge tube, then putting a sample into liquid nitrogen, and carrying out oscillation and smashing on a proofing machine to obtain a sample; then, 800 muL of the solution is added into the samplePreheating cetyl trimethyl ammonium bromide lysate at 65 ℃, simultaneously adding beta-mercaptoethanol to prevent oxidation, uniformly mixing until no obvious layering occurs, placing in a water bath at 65 ℃ for 30 minutes, and slowly reversing and uniformly mixing once every 10 minutes; after water bath, adding 800 muL of chloroform/isoamyl alcohol mixed solution with the volume ratio of 24:1, and repeatedly reversing until no layering occurs; then, the mixture was centrifuged at 12000rpm for 10 minutes at 4 ℃; sucking the supernatant by using a tip-free gun head, wherein the supernatant is about 600 mu L, and transferring the supernatant to another 2mL centrifuge tube; adding ice-cooled isopropanol with the volume of 0.8 time, slightly inverting for several times until flocculent DNA is generated, centrifuging at 12000rpm for 1 minute, and pouring out the ice-cooled isopropanol; adding 75% ethanol, washing for 2 times, and washing with anhydrous ethanol for 1 time; pouring off the absolute ethyl alcohol, and adding 200 muL ddH after drying₂And dissolving the O to obtain the genome DNA of the GhFPF1 transgenic cotton plant, and storing at 4 ℃ for later use. The GhFPF1 gene-transferred cotton is a transgenic plant ZF667 of the Cotton research institute of Chinese academy of agricultural sciences, and is obtained by introducing the cDNA sequence of the GhFPF1 gene into the Cotton institute 24 (national approval GS 08001-1997) of a cotton variety by an agrobacterium-mediated method, and the structural map of a transformation vector pBI121-GhFPF1 is shown in figure 1.

(2) Entrust Beijing and kang biotechnology limited company to carry on resequencing analysis to the above-mentioned genomic DNA which changes GhFPF1 gene cotton plant, specifically, after changing GhFPF1 gene cotton plant's genomic DNA to detect and pass, use the method of mechanical breaking (supersonic wave) to segment DNA, then carry on segment purification, end repair, 3' end add A, connect sequencing joint to fragmented DNA, reuse agarose gel electrophoresis to carry on the size selection of fragment, carry on PCR amplification and form the sequencing library, the library of library built carries on the quality control of the library first, the qualified library of quality control carries on the sequencing with Illumina HiSeq platform; the off-line Data was filtered to obtain Clean Data, and then reads were aligned to Gossypium hirsutum (AD 1), NAU association database and Mapped Data obtained on the insert sequence in the designated reference genomic cotton genome database (http:// www.cottonfgd.org /), and used for exogenous insert search. The specific searching method comprises the following steps: firstly, finding junction reads which contain a reference genome and an insertion sequence in the read; then, determining an insertion position and a direction according to the comparison information of the connection reads; finally, these reads are clustered to determine the insertion location and length, and whether there are pairs of junction clusters. Finding out the following two types of Paired _ end reads according to the comparison result: the first type is that a reference genome sequence is aligned on a reads at one end, and an insertion sequence is aligned on a reads at the other end; the second type is that a part of reads at either end is aligned with the reference genome sequence, and the other part is aligned with the insert sequence. And (3) comparing the reference genome by adopting BWA, selecting all reads capable of comparing the exogenous insertion sequences, and carrying out local assembly. And respectively comparing the exogenous insertion sequence and the reference genome result by using Blastn according to the assembled contig, selecting regions of the contig sequence compared to the chromosome, and carrying out IGV screenshot verification on bwa comparison results of the regions to obtain the insertion position information of the exogenous insertion fragment. The insertion position of the exogenous insertion fragment of GhFPF1 transgenic cotton is verified to be A12 chromosome 63373235 of Zhongmian cotton plant 24, and sequences with insertion sites of 1255bp in upstream and downstream lengths in a reference cotton genome are obtained, wherein the nucleotide sequence of 63372735-63373989 sites of the Gomian cotton plant 24 is shown as SEQ ID NO. 1.

(3) And designing PCR detection primers according to the sequence of the exogenous insertion fragment of the GhFPF1 transgenic cotton and the upstream and downstream sequences of the insertion site in a cotton reference genome. Wherein, the nucleotide sequences of the GhFPF1 transgenic cotton left boundary flanking sequence amplification primer pair are shown as SEQ ID NO. 4-5, and are respectively: 5'-GCACCCAGATAATACGGGCT-3' and 5'-CCTTCAACGTTGCGGTTCTG-3'; the nucleotide sequences of the GhFPF1 transgenic cotton right border flanking sequence amplification primer pair are shown as SEQ ID NO. 6-7, and respectively are as follows: 5'-TCAAGCTCTAAATCGGGGGC-3', and 5'-AAGCATGCACCATGAAGCAAC-3'. Then, taking the genomic DNA of the GhFPF1 transgenic cotton plant as a DNA template, and respectively carrying out PCR amplification reaction by using the two groups of primers to obtain two groups of PCR amplification products, wherein a PCR reaction system (10 uL) is as follows: 5 muL of PCR premixed solution; 0.8 muL of primer pairs (0.4 muL of each of 2 primers); 2 muL of DNA template; ddH₂O2.2 muL. The PCR reaction conditions are as follows: pre-denaturation at 94 deg.C for 2min, denaturation at 94 deg.C for 30S, annealing at 55 deg.C for 30S, and annealingStretching at 72 ℃ for 30 seconds for 30 cycles; final extension at 72 deg.C for 2min, and storage at 4 deg.C. And respectively detecting the two groups of PCR amplification products by using 1% agarose gel electrophoresis, purifying the PCR products by using a gel recovery kit, entrusting a prokaryote biotechnology company to perform sequencing verification, and comparing a sequencing result with an exogenous insertion sequence and a reference genome sequence to finally obtain a left boundary flanking sequence (namely the left flanking sequence) and a right boundary flanking sequence (namely the right flanking sequence) of the exogenous insertion fragment of the GhFPF1 transgenic cotton. It should be noted that, as the PCR premix, commercially available 2 × Taq MasterMix (Dye) can be used.

Example 3

This example provides a primer for identifying the specificity of the flanking sequence of the cotton insertion site of the GhFPF1 gene, which is designed based on the left flanking sequence provided in example 1 above. Specifically, the primer comprises a first primer; the first primer comprises a first forward primer designed according to the 1 st to 501 th site sequences of the left flanking sequence and a first reverse primer designed according to the 502 th to 937 th site sequences of the left flanking sequence; wherein, the nucleotide sequence of the first forward primer is shown as a sequence table SEQ ID NO. 4 and is as follows: 5'-GCACCCAGATAATACGGGCT-3', respectively; the nucleotide sequence of the first reverse primer is shown as a sequence table SEQ ID NO. 5 and comprises the following components: 5'-CCTTCAACGTTGCGGTTCTG-3' are provided.

Example 4

This example provides a primer for identifying the specificity of the flanking sequence of the cotton insertion site of the GhFPF1 gene, which is designed according to the right flanking sequence provided in example 2 above. Specifically, the primer comprises a second primer; the second primer comprises a second forward primer designed according to the 1 st to 466 th site sequences of the right flanking sequence and a second reverse primer designed according to the 467 th to 967 th site sequences of the right flanking sequence; wherein the nucleotide sequence of the second forward primer is shown as a sequence table SEQ ID NO. 6 and is: 5'-TCAAGCTCTAAATCGGGGGC-3', respectively; the nucleotide sequence of the second reverse primer is shown as a sequence table SEQ ID NO. 7 and is as follows: 5'-AAGCATGCACCATGAAGCAAC-3' are provided.

Example 5

This example provides a kit for identifying the specificity of flanking sequences of a cotton insertion site of a GhFPF1 gene, which comprises a PCR premix and the primers provided in the above example 3. As the PCR premix, 2 × Taq MasterMix (Dye) which is commercially available is used.

Example 6

This example provides a kit for identifying the specificity of flanking sequences of a cotton insertion site of a GhFPF1 gene, which comprises a PCR premix and the primers provided in example 4. As the PCR premix, 2 × Taq MasterMix (Dye) which is commercially available is used.

Example 7

The embodiment provides a method for detecting whether a sample to be detected contains GhFPF1 transgenic cotton, which is detected by using the kit provided in theembodiment 5, and specifically comprises the following steps:

(1) extracting the genome DNA of a sample to be detected as a DNA template according to the method for extracting the genome DNA of the GhFPF1 transgenic cotton plant.

(2) 2 muL of DNA template, 5 muL of PCR premixed solution, 0.4 muL of first forward primer, 0.4 muL of first reverse primer and 2.2 muL of ddH₂And O, mixing to obtain a PCR reaction solution.

(3) Placing the PCR reaction solution in a PCR instrument for PCR amplification reaction to obtain a PCR reaction product; wherein, the PCR reaction conditions are as follows: pre-denaturation at 94 deg.C for 2min, denaturation at 94 deg.C for 30S, annealing at 55 deg.C for 30S, extension at 72 deg.C for 30S, and 30 cycles; final extension at 72 deg.C for 2min, and storage at 4 deg.C.

(4) Carrying out 1% agarose gel electrophoresis detection on the PCR reaction product, and dyeing by using nucleic acid dye to judge whether a specific band exists in the PCR reaction product; if a specific band exists in the PCR reaction product, the sample to be detected contains the GhFPF1 transgenic cotton component. The GhFPF1 transgenic cotton comprises the parents, plants, tissues and seeds of derived lines, and the like.

The method is used for detecting samples of a leaf of GhFPF1 gene-transferred cotton, a seed of GhFPF1 gene-transferred cotton, a root of the seed of GhFPF1 gene-transferred cotton, non-transgenic Zhongmian 24, Zhongmian 50, corn, wheat and the like, and clear water is used as a negative control group, and the gel electrophoresis pattern obtained by detection is shown in figure 2, wherein M is DNA molecular weight standard (DL 5000), 1 is the leaf of GhFPF1 gene-transferred cotton, 2 is the seed of GhFPF1 gene-transferred cotton, 3 is the root of the leaf of GhFPF1 gene-transferred cotton, 4 is thenon-transgenic Zhongmian 24, 5 is theZhongmian 50, 6 is the corn, 7 is the wheat, and 8 is the clear water. As can be seen from the figure, only the samples of leaves, seeds and roots of GhFPF1 transgenic cotton generate specific amplification bands with the length of 301bp, and the other samples do not generate specific amplification bands, which indicates that the detection method provided by the embodiment of the invention can accurately detect whether the samples are GhFPF1 transgenic cotton or cotton containing GhFPF1 transgenic cotton.

Example 8

The embodiment provides a method for detecting whether a sample to be detected contains GhFPF1 transgenic cotton, which is detected by using the kit provided in theembodiment 6, and specifically comprises the following steps:

(1) extracting the genome DNA of a sample to be detected as a DNA template according to the method for extracting the genome DNA of the GhFPF1 transgenic cotton plant.

(2) 2 muL of DNA template, 5 muL of PCR premixed solution, 0.4 muL of second forward primer, 0.4 muL of second reverse primer and 2.2 muL of ddH₂And O, mixing to obtain a PCR reaction solution.

(3) Placing the PCR reaction solution in a PCR instrument for PCR amplification reaction to obtain a PCR reaction product; wherein, the PCR reaction conditions are as follows: pre-denaturation at 94 deg.C for 2min, denaturation at 94 deg.C for 30S, annealing at 55 deg.C for 30S, extension at 72 deg.C for 30S, and 30 cycles; final extension at 72 deg.C for 2min, and storage at 4 deg.C.

(4) Carrying out 1% agarose gel electrophoresis detection on the PCR reaction product, and dyeing by using nucleic acid dye to judge whether a specific band exists in the PCR reaction product; if a specific band exists in the PCR reaction product, the sample to be detected contains the GhFPF1 transgenic cotton component. The GhFPF1 transgenic cotton comprises the parents, plants, tissues and seeds of derived lines, and the like.

The method is used for detecting samples of a leaf of GhFPF1 transgenic cotton, a seed of GhFPF1 transgenic cotton, a root of the seed of the GhFPF1 transgenic cotton, non-transgenic Zhongmian cotton 24, Zhongmian cotton 50, corn, wheat and the like, and clear water is used as a negative control group, and the gel electrophoresis chart obtained by detection is shown in figure 3, wherein M is a DNA molecular weight standard (DL 5000), 1 is the leaf of the GhFPF1 transgenic cotton, 2 is the seed of the GhFPF1 transgenic cotton, 3 is the root of the GhFPF1 transgenic cotton, 4 is thenon-transgenic Zhongmian cotton 24, 5 is theZhongmian cotton 50, 6 is the corn, 7 is the wheat and 8 is the clear water. As can be seen from the figure, only the samples of leaves, seeds and roots of GhFPF1 transgenic cotton generate specific amplification bands with the length of 556bp, and the other samples do not generate specific amplification bands, which indicates that the detection method provided by the embodiment of the invention can accurately detect whether the samples are GhFPF1 transgenic cotton or contain GhFPF1 transgenic cotton components.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Sequence listing

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Claims (8)

1. The flanking sequence of the cotton insertion site of the GhFPF1 transgenic gene is characterized by comprising a left flanking sequence and/or a right flanking sequence; the nucleotide sequence of the left flanking sequence is shown as a sequence table SEQ ID NO. 2, and the nucleotide sequence of the right flanking sequence is shown as a sequence table SEQ ID NO. 3; the 1 st to 501 th site sequences of the left flank sequence are derived from a genome sequence of a Zhongmian 24, and the 502 th to 937 th site sequences of the left flank sequence are derived from an exogenous insert sequence of GhFPF1 transgenic cotton; the 1 st to 466 th site sequences of the right flanking sequence are derived from the exogenous insertion fragment sequence of GhFPF1 transgenic cotton, and the 467 th to 967 th site sequences of the right flanking sequence are derived from the genome sequence of Zhongmiao 24.

2. Primer for identifying the specificity of the flanking sequence of the cotton insertion site of the GhFPF1 gene, wherein the primer is designed according to the flanking sequence of claim 1.

3. The primer for identifying the specificity of the flanking sequence of the cotton insertion site of the GhFPF1 transgenic gene of claim 2, wherein the primer comprises a first primer and/or a second primer; the first primer comprises a first forward primer designed according to the 1 st to 501 th site sequences of the left flanking sequence and a first reverse primer designed according to the 502 th to 937 th site sequences of the left flanking sequence; the second primer comprises a second forward primer designed according to the 1 st to 466 th site sequences of the right flank sequence and a second reverse primer designed according to the 467 th to 967 th site sequences of the right flank sequence.

4. The GhFPF1 gene transferring cotton insertion site flanking sequence specific identification primer of claim 3, wherein the nucleotide sequence of the first forward primer is shown in sequence table SEQ ID NO. 4; the nucleotide sequence of the first reverse primer is shown as a sequence table SEQ ID NO. 5.

5. The GhFPF1 gene transferring cotton insertion site flanking sequence specific identification primer of claim 3, wherein the nucleotide sequence of the second forward primer is shown in sequence table SEQ ID NO. 6; the nucleotide sequence of the second reverse primer is shown in a sequence table SEQ ID NO. 7.

6. A kit for identifying the specificity of a flanking sequence of a cotton insertion site of a GhFPF1 gene, which comprises a PCR premix, and is characterized by further comprising the primer as claimed in any one of claims 2 to 5.

7. The method for specifically identifying the flanking sequence of the insertion site of the GhFPF1 transgenic cotton is characterized by comprising the following steps of:

obtaining genome DNA of a sample to be detected as a DNA template;

mixing a DNA template, a PCR premix and the primer according to any one of claims 2-5 to obtain a PCR reaction solution;

carrying out PCR amplification reaction on the PCR reaction solution to obtain a PCR reaction product;

carrying out gel electrophoresis detection on the PCR reaction product to judge whether a specific band exists in the PCR reaction product; if a specific band exists in the PCR reaction product, the sample to be detected contains the GhFPF1 transgenic cotton component.

8. The method for identifying the specificity of the flanking sequences of the insertion site of the GhFPF1 transgenic cotton according to claim 7, wherein the detection of gel electrophoresis is agarose gel electrophoresis detection.

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