阅读说明：本技术 叶斑艺兰花f3′5′h基因的植物表达载体构建及其应用 (Construction and application of plant expression vector of F3'5' H gene of phyllanthus floridulus ) 是由 王玉英 李枝林 凌青 李国昌 苏俊 马伟荣 黄新龙 刘丹 李茹 于 2020-06-18 设计创作，主要内容包括：本发明公开了一种含有叶斑艺兰花类黄酮3’,5’-羟化酶基因(F3’5’H)且能提高植物花青素含量的专用植物表达载体pCAMBIA1301-35S-F3’5’H。本发明是利用RACE的方法从叶斑艺兰花中克隆出F3’5’H基因,用35S启动子在铁皮石斛中过量表达,并通过类似叶盘(原球茎)转化法将其转入野生型铁皮石斛中。实验结果表明在转基因铁皮石斛中F3’5’H基因能够正常表达,转入F3’5’H基因的生长情况比对照植株,转基因植株表现为更健壮,茎秆和叶片显示紫红色的特点,过量表达F3’5’H基因能够很大程度的提高增加转基因铁皮石斛中F3’5’H酶活性,蛋白质含量、可溶性糖含量增加,花青素和类黄酮物质含量增加。表明了叶斑艺兰F3’5’H基因对铁皮石斛生长发育有促进作用,且促进了类黄酮和花青素的合成,导致植株出现紫红色显色。(The invention discloses a special plant expression vector pCAMBIA1301-35S-F3'5' H containing 3',5' -hydroxylase gene (F3'5' H) of cymbidium floribundum and capable of improving the content of plant anthocyanin. The invention clones F3'5' H gene from leaf spot art orchid by RACE method, uses 35S promoter to over-express in Dendrobium officinale, and transfers it into wild type Dendrobium officinale by similar leaf disc (protocorm) transformation method. Experimental results show that the F3'5' H gene in the transgenic dendrobium officinale can be normally expressed, the transgenic plant is stronger when the growth condition of the F3'5' H gene is transferred than that of a control plant, the stem and the leaves show purplish red, the F3'5' H enzyme activity in the transgenic dendrobium officinale can be greatly improved and increased by over-expressing the F3'5' H gene, the protein content and the soluble sugar content are increased, and the anthocyanin and flavonoid substance content is increased. The result shows that the leaf spot art orchid F3'5' H gene has a promoting effect on the growth and development of the dendrobium officinale, and promotes the synthesis of flavonoid and anthocyanin, so that the plant is purple red and develops color.)

1. A recombinant vector is characterized by comprising a 3',5' -hydroxylase gene, namely F3'5' H gene, of the flavonoid of the cymbidium floribundum, wherein the nucleotide sequence of the F3'5' H gene is shown as SEQ ID NO. 1.

2. The recombinant vector of claim 1, wherein the starting vector for constructing the plant expression vector is pCAMBIA 1301.

3. The recombinant vector of claim 2, wherein the recombinant vector is pCAMBIA1301-35S-F3'5' H, having the promoter 35S ligated to the starting vector pCAMBIA1301 followed by the F3'5' H gene.

4. The method of constructing a recombinant vector according to any one of claims 1 to 3, comprising the steps of:

(1) amplification of the F3'5' H Gene of cymbidium floribundum

Comparing the F3'5' H gene sequence obtained from the transcriptome, finding that the F3'5' H gene sequence has 5', amplifying 3' by using RACE technology to obtain a full-length gene fragment;

(2) TA cloning of the F3'5' H Gene

Recovering a coding region gene fragment of F3'5' H, connecting the coding region gene fragment to a pMD18-T vector, extracting plasmid DNA by adopting an alkaline lysis method, obtaining a recombinant plasmid pMD-F3'5' H through PCR detection and enzyme digestion detection, screening positive clones, enriching a bacterial liquid, and extracting a plasmid;

(3) construction of F3'5' H gene plant expression vector pCAMBIA1301-35S-F3'5' H

Carrying out double enzyme digestion on the recombinant plasmid pMD-F3'5' H by using NcoI and BstEII, and recovering a band containing the full length of F3'5' H after enzyme digestion; then, NcoI and BstEII are used for enzyme digestion of pCAMBIA1301 vectors, obtained vector fragments are recovered, complementary cohesive ends are carried on obtained full-length sequences and vector sequences, the two are connected, escherichia coli is transformed, recombinants are screened out through enzyme digestion identification, and the plant-expressed recombinant vector pCAMBIA1301-35S-F3'5' H is constructed.

5. The method of claim 4, wherein the steps of:

(1) the amplification of the F3'5' H gene of the phyllanthus floribundus L specifically comprises the following steps:

(ii) PCR primer

The following primers were designed based on the F3'5' H gene fragment obtained in the transcriptome,

B26：5’-GACTCTAGACGACATCGATTTTTTTTTTTTTTTTT-3’；

F3'5'H1：5’-CTCTCAGCATACCTCACTACGCCTC-3’；

F3'5'H2：5’-GTTCCCAAGAAATACTGCACCATCA-3’；

② PCR was carried out using the above reverse transcription product in the following system, 10xPCR buffer2.5ul, dNTP mix (10mM)2.5ul, F3'5' H10.5ul, B260.5ul, cDNA1.5ul, Taq plus0.25ul and H₂O16.25ul, total capacity 25 ul;

PCR reaction procedure is as follows: pre-denaturation at 96 ℃ for 5 min; denaturation at 94 ℃ for 30sec, annealing at 60 ℃ for 30sec, extension at 72 ℃ for 2min, 35 cycles; extending for 10min at 72 ℃, and stopping the reaction at 4 ℃;

fourthly, the same system and reaction program are adopted, the RCR product obtained in the third step is used as a template to carry out second round PCR, and the primers are F3'5' H2 and B26;

connecting the obtained fragment into pMDl8-T, and performing sequence determination after enzyme digestion identification;

splicing the full-length cDNA of the target gene according to the determined sequence and the overlapping region thereof, and respectively designing primers:

f3'5' H3: 5'-CGTTCGGAGCGGGGCGGAGGATTTGC-3' and F3'5' H4: 5'-CGGGAAGTTAATGGGGATGCTGATGG-3', PCR full-length sequences were amplified for further validation.

6. The use of the recombinant vector constructed by the construction method according to claim 5 in the preparation of transgenic Agrobacterium plants.

7. The use of the recombinant vector of claim 6, wherein the recombinant vector is used for preparing Agrobacterium transgenic Dendrobium officinale.

Technical Field

The invention belongs to the field of plant genetic engineering, and particularly relates to a plant expression vector pCAMBIA1301-35S-F3'5' H of flavonoid 3',5' -hydroxylase gene F3'5' H, a construction method thereof and application thereof in transgenic plants.

Background

The leaf (line) art orchid (line art orchid) refers to a general name of Chinese orchids with golden yellow, silvery white, dark green, vermilion or black mouth, edge, point, line and spot inlaid on leaves of orchidae (orchidae) orchid plants, and can be roughly divided into line art orchid, spot art orchid and crystal art orchid, and different color and shape variation types such as leaf butterfly also appear along with the deep appreciation and understanding of orchid leaf art. The variety of the cymbidium sinense has the most number of cymbidium sinense (such as 'white black of leaf art', 'silver dragging cymbidium', 'dalomo', 'lightning', 'solar direction', 'lucky jade', 'large stone door'), the second time of cymbidium sinense (C.goeringii), cymbidium faberi and cymbidium kanran (C.kanran), the cultivation history of the cymbidium sinense has been known for thousands of years, and the cymbidium sinense is known as 'monarch of flower' and is a precious ornamental flower. The leaf (line) art is popular in Japan for the first time, and with the advent of the leaf (line) art orchid 'Jiajiayu' the Japan orchid world raises a hot tide for pursuing the variety of the leaf art orchid, and forms the extremely hot leaf (line) art orchid market atmosphere, for example, the 'Ruiyu' of the leaf (line) art variety of Maolan in the 40 th generation has a selling price of 5 ten thousand yen (3 seedlings), the 'Helichua' in the 60 th generation has a selling price of 650 ten thousand yen (7 seedlings), and the 'Damomao' is more $ 20-30 million dollars per seedling. In recent decades, leaf (line) art is popular in the continents of our country, although it starts late, it develops rapidly, and various types of variation, such as flowers, leaves and dwarf seeds, emerge endlessly. When the orchid is not in use, the orchid is difficult to trade and is easy to generate disputes, the leaf art orchid is mainly based on leaf observation and can be identified by leaf shape, leaf state, color and the like, the commodity value can be increased by times or even hundreds of times according to different line art types, and the market prospect is very wide.

At present, the biosynthesis pathway of flavonoid substances participating in flower color formation is relatively clear. 4-Coumaryl-coenzyme A (coumaroyl-coenzyme A) is a precursor for the synthesis of class 3 anthocyanin glycosides in the flavonoid synthesis pathway, which is capable of synthesizing 4,2 ', 4 ', 6 ' -tetrahydroxystyryl ketone (tetrahydroxychalcone) under the catalysis of chalcone synthase (CHS). 4,2 ', 4 ', 6 ' -tetrahydroxystyrene is catalyzed by chalcone isomerase (CHI) to synthesize colorless naringenin. Naringenin can be catalyzed by flavanone-3-hydroxylase (F3-hydroxyrase, F3H) to Dihydrokaempferol (DHK), which is catalyzed by flavonoid-3 '-hydroxylase (F3' H) to generate Dihydroquercitrin (DHQ). Flavonoid-3 ',5' -hydroxylase (flavanoid 3',5' -hydroxyylase, F3'5' H) catalyzes DHK to produce Dihydromyricetin (DHM) (step a). Quercus dihydroquercetin (quercus dihydroflavonol) flavone generates cyanidin (cyaniding 3-O-glucoside, Cy) from red to purple under the action of dihydroxyflavone reductase (DFR), anthocyanin synthase (ANS) or 3-glucosyltransferase (3 GT) enzyme. Dihydromyricetin can generate delphinidin 3-O-glucoside (Dp) with a bluish purple color under the catalytic action of the three enzymes [24 ]. The F3'5' H gene plays an important role in regulating and controlling the synthesis of anthocyanin, so the research on the leaf spot art orchid F3'5' H gene can change the variety or the content of the anthocyanin so as to directionally improve the leaf color.

Currently, the F3'5' H gene sequence has been cloned from plants such as tomato (Solanumlycopersicum), african violet (sainpauliandian ahh. wendl.), eustoma grandiflorum (eustoma grandiflorum), eggplant (daturastramonum), epimedium sagittatum (sieb. et. Zucc.) and vitis amurensis rupr. At least 38 plant sequences of about 58F 3'5' H genes have been published on the NCBI website. The total RNA is extracted from the tender bud of the 'Zhuanwu' tuber by Yang Xiaona and the like, and is cloned to a cDNA sequence (GenBank accession number is HQ860267) of F3'5' H by RT-PCR, the molecular weight of an expression protein obtained by SDS-PAGE is about 55kDa, the full length of a gene is 1518bp, the length of a coding region is 1485bp, and 494 amino acids are coded in total. The key gene SrF 3'5' H of the flavonoid biosynthetic pathway is cloned from yellow calyx of the strelitzia reginae by RT-PCR and RACE methods, the total length of the cDNA is 1766bp, the cDNA has a complete Open Reading Frame (ORF), 1509 basic groups are totally encoded, 503 amino acids are encoded, and the transcription level of the SrF 3'5' H reaches the highest level at the initial flowering stage by applying semi-quantitative PCR analysis. Nakatsuka et al successfully reduced the expression of F3'5' H gene in gentian plants and altered the flower color of gentian plants by antisense suppression. Holton et al studied the F3'5' H gene of petunia, and found that the F3'5' H enzyme can catalyze dihydroquercetin and dihydrokaempferol to produce dihydromyricetin. Toguri et al also studied petunia and found that the F3'5' H gene was not expressed in leaves and was expressed in a high amount in the middle of bud development. By a transgenic technology, the phalaenopsis F3'5' H is introduced into lily, and the DFR color-assisting gene is introduced at the same time, so that the blue lily is finally obtained. Bruqlieera et al introduced violet F3'5' H gene into chrysanthemum to obtain light blue chrysanthemum. Xubi jade and the like transfer the F3'5' H gene of petunia into lilium formosanum to obtain a transgenic plant, and Wang and the like find that the F3'5' H gene of phalaenopsis can be detected only in the flower color stage and is not expressed in roots, leaves and other organs. The white blue and the like clone, express and immunologically identify the F3'5' H gene in the transgenic carnation.

Chandler et al introduced petunia F3'5' H gene and DFR gene into white carnation to obtain blue carnation, and successfully put it on the market. The cDNA sequence of wild buckwheat rhizome F3'5' H gene is obtained by transcriptome sequencing of plum light, etc., and the wild buckwheat rhizome F3'5' H gene belongs to cytochrome P45078A 10 family by the analysis of evolutionary tree. The royal jelly and the like clone F3'5' H gene full-length cDNA from blue petunia petals and successfully construct an expression vector of F3'5' H gene driven by a flower-specific promoter PchsA. However, the current research on the leaf F3'5' H gene of cymbidium bicolor has not been reported yet.

Disclosure of Invention

The invention aims to provide a plant expression vector of flavonoid 3',5' -hydroxylase gene for improving the content of plant anthocyanin, which is a plant expression vector containing the flavonoid 3',5' -hydroxylase gene F3'5' H. Meanwhile, a construction method of the vector and application of the vector in improving the content of plant anthocyanin are provided.

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

a recombinant vector contains a 3',5' -hydroxylase gene, namely F3'5' H gene, of the flavonoid of the cymbidium floribundum, wherein the nucleotide sequence of the F3'5' H gene is shown as SEQ ID NO: 1.

Further, the starting vector for constructing the plant expression vector was pCAMBIA 1301.

Furthermore, the recombinant vector is pCAMBIA1301-35S-F3'5' H, and a promoter 35S is linked to the starting vector pCAMBIA1301, followed by the F3'5' H gene.

Further, the invention also provides a construction method of the recombinant vector, which comprises the following steps:

(1) amplification of the F3'5' H Gene of cymbidium floribundum

Comparing the F3'5' H gene sequence obtained from the transcriptome, finding that the F3'5' H gene sequence has 5', amplifying 3' by using RACE technology to obtain a full-length gene fragment;

(2) TA cloning of the F3'5' H Gene

Recovering a coding region gene fragment of F3'5' H, connecting the coding region gene fragment to a pMD18-T vector, extracting plasmid DNA by adopting an alkaline lysis method, obtaining a recombinant plasmid pMD-F3'5' H through PCR detection and enzyme digestion detection, screening positive clones, enriching a bacterial liquid, and extracting a plasmid;

(3) construction of F3'5' H gene plant expression vector pCAMBIA1301-35S-F3'5' H

Carrying out double enzyme digestion on the recombinant plasmid pMD-F3'5' H by using NcoI and BstEII, and recovering a band containing the full length of F3'5' H after enzyme digestion; then, NcoI and BstEII are used for enzyme digestion of pCAMBIA1301 vectors, obtained vector fragments are recovered, complementary cohesive ends are carried on obtained full-length sequences and vector sequences, the two are connected, escherichia coli is transformed, recombinants are screened out through enzyme digestion identification, and the plant-expressed recombinant vector pCAMBIA1301-35S-F3'5' H is constructed. Preferably, the amplification of the cymbidium floribundum F3'5' H gene in the step (1) specifically comprises the following steps:

(ii) PCR primer

The following primers were designed based on the F3'5' H gene fragment obtained in the transcriptome,

B26：5’-GACTCTAGACGACATCGATTTTTTTTTTTTTTTTT-3’；

F3′5′H1：5’-CTCTCAGCATACCTCACTACGCCTC-3’；

F3′5′H2：5’-GTTCCCAAGAAATACTGCACCATCA-3’；

② PCR was carried out using the above reverse transcription product in the following system, 10xPCR buffer2.5ul, dNTP mix (10mM)2.5ul, F3'5' H10.5ul, B260.5ul, cDNA1.5ul, Taq plus0.25ul and H₂O16.25ul, total capacity 25 ul;

PCR reaction procedure is as follows: pre-denaturation at 96 ℃ for 5 min; denaturation at 94 ℃ for 30sec, annealing at 60 ℃ for 30sec, extension at 72 ℃ for 2min, 35 cycles; extending for 10min at 72 ℃, and stopping the reaction at 4 ℃;

fourthly, the same system and reaction program are adopted, the RCR product obtained in the third step is used as a template to carry out second round PCR, and the primers are F3'5' H2 and B26;

connecting the obtained fragment into pMDl8-T, and performing sequence determination after enzyme digestion identification;

sixthly, splicing the full-length cDNA of the target gene according to the determined sequence and the overlapping region thereof, and respectively designing a primer F3'5' H3: 5'-CGTTCGGAGCGGGGCGGAGGATTTGC-3' and F3'5' H4: 5'-CGGGAAGTTAATGGGGATGCTGATGG-3', PCR full-length sequences were amplified for further validation.

Furthermore, the recombinant vector constructed by the construction method is mainly applied to preparation of agrobacterium transgenic plants.

Further, the recombinant vector prepared by the invention is applied to preparation of agrobacterium tumefaciens transgenic dendrobium officinale.

The invention clones F3'5' H gene from leaf spot art orchid by RACE method, uses 35S promoter to over-express in Dendrobium officinale, and transfers it into wild type Dendrobium officinale by similar leaf disc (protocorm) transformation method. Experimental results show that the F3'5' H gene in the transgenic dendrobium officinale can be transcribed normally, the growth condition of the transferred F3'5' H gene is stronger than that of a control plant (a wild type without transgenosis), the transgenic plant is characterized in that the stem and leaves show purplish red, the F3'5' H gene is overexpressed, the activity of the F3'5' H enzyme in the transgenic dendrobium officinale can be improved to a great extent, the protein content and the soluble sugar content are increased, and the anthocyanin and flavonoid substance content is increased. The result shows that the leaf spot art orchid F3'5' H gene has a promoting effect on the growth and development of the dendrobium officinale, and promotes the synthesis of flavonoid and anthocyanin, so that the plant is purple red and develops color.

Description of the drawings:

FIG. 1A is a PCR product of the 3' end of the F3'5' H gene, M is marker 2000 bp; 3: 3' RACE product B is F3'5' H gene full-length amplification, M is maker10000 bp; 1: the full length of F3'5' H gene;

FIG. 2: double enzyme digestion of pCAMBIA1301 vector;

FIG. 3: f3'5' H gene overexpression vector;

FIG. 4 QPCR detection of the expression of F3'5' H gene in transgenic and wild plants

FIG. 5 transgenic and wild type plant morphology;

FIG. 6: the contents of anthocyanin and flavonoid in leaves of wild type and transgenic dendrobium officinale plants;

FIG. 7: soluble protein and sugar content in leaves of wild type and transgenic dendrobium officinale plants

Wherein: A. b, C is a transgenic plant; CK is wild plant.

Detailed Description

In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.

To avoid unnecessary detail, the following examples will not describe the known art in detail. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

The test reagent consumables used in the following examples are all conventional biochemical reagents unless otherwise specified; the experimental methods are conventional methods unless otherwise specified.

Firstly, constructing a recombinant vector pCAMBIA1301-35S-F3'5' HpCAMBIA1301-35S-F3 '5' H of F3'5' H, wherein the pCAMBIA1301-35S-F3'5' H plant expression vector contains F3'5' H gene of cymbidium lobayense, and an initial vector is pCAMBIA 1301.

The pCAMBIA1301-35S-F3'5' H plant expression vector obtained by the invention contains 35S promoter, and is followed by F3'5' H gene.

The so-called F3'5' H gene is obtained by RACE technology on the basis of EST sequences in transcriptome data constructed by us and is named as F3'5' H, the nucleotide sequence is shown as SEQ ID NO:1, ORF Finder analysis shows that the F3'5' H gene has a complete open reading frame with a longer sequence, 1512bp in total, an initiation codon is ATG, a termination codon is TAA, and 503 amino groups in total are codedAnd (4) acid. The molecular formula of the protein is presumed to be C by ExPASy analysis₂₅₁₇H₄₀₁₈N₆₈₆O₆₉₂S₂₇The molecular weight is 55827.39, and the isoelectric point PI is 8.75.

Secondly, the recombinant vector pCAMBIA1301-35S-F3'5' H is constructed by the following method:

(1) amplification of the F3'5' H Gene of cymbidium floribundum

Comparing the F3'5' H gene sequence obtained from our transcriptome, the F3'5' H gene sequence was found to have 5', and 3' was amplified by RACE technique to obtain the full-length gene sequence shown in FIG. 1.

(ii) PCR primer

Primers were designed based on the fragment of the F3'5' H gene obtained in our transcriptome:

B26：5’-GACTCTAGACGACATCGATTTTTTTTTTTTTTTTT-3’

F3′5′H1：5’-CTCTCAGCATACCTCACTACGCCTC-3’

F3′5′H2：5’-GTTCCCAAGAAATACTGCACCATCA-3’

secondly, PCR is carried out by using the reverse transcription product, and the system is as follows:

10xPCR buffer	2.5ul
		dNTP mixture(10mM)	2.5ul
F3′5′H1	0.5ul
		B26	0.5ul
cDNA	1.5ul
		Taq plus	0.25ul
H2O	16.25ul
		Total volume	25ul

PCR reaction procedure is as follows: pre-denaturation at 96 ℃ for 5 min; denaturation at 94 ℃ for 30sec, annealing at 60 ℃ for 30sec, extension at 72 ℃ for 2min, 35 cycles; extension was carried out at 72 ℃ for 10min and the reaction was stopped at 4 ℃.

Fourthly, the same system and reaction program are adopted, the RCR product of the first round is taken as a template to carry out second round PCR, and the primers are F3'5' H2 and B26.

Linking the obtained fragment with pMDl8-T, and performing sequence determination after enzyme digestion identification.

Sixthly, splicing the full-length cDNA of the target gene according to the determined sequence and the overlapping region thereof, and respectively designing a primer F3'5' H3: 5'-CGTTCGGAGCGGGGCGGAGGATTTGC-3' and F3'5' H4: 5'-CGGGAAGTTAATGGGGATGCTGATGG-3' are provided. The full-length sequence was amplified by PCR for further validation.

(2) TA cloning of the F3'5' H Gene

Recovering a coding region gene fragment of F3'5' H, connecting the coding region gene fragment to a pMD18-T vector, extracting plasmid DNA by adopting an alkaline lysis method, and obtaining a recombinant plasmid pMD-F3'5' H through PCR detection and enzyme digestion detection;

(3) construction and screening of a forward positive clone of a plant expression vector pCAMBIA1301-35S-F3'5' H of the F3'5' H gene, carrying out bacterial liquid enrichment, extracting a pMD-F3'5' H plasmid, carrying out double enzyme digestion by using NcoI and BstEII, and recovering a band containing the full length of F3'5' H after enzyme digestion; the pCAMBIA1301 vector was digested with NcoI and BstEII, and the resultant vector fragment was recovered as shown in FIG. 2. The obtained full-length sequence and the vector sequence are provided with complementary cohesive ends, and are connected to transform escherichia coli, recombinants are screened out through enzyme digestion identification, and a plant expression vector pCAMBIA1301-35S-F3'5' H is constructed.

Genetic transformation of agrobacterium and detection of transformants

Competent cells of Agrobacterium were prepared, the above-constructed plant expression vector pCAMBIA1301-35S-F3'5' H was transferred to Agrobacterium (EHA105) by electric pulse method, and transformant colonies were selected on a plate containing hygromycin. The lysate of the agrobacterium colony is used as a template of PCR reaction, specific primers F3'5' H3 and F3'5' H4 of F3'5' H gene are used as PCR detection transformant colonies, and the transformant colonies confirmed by colony PCR are used for transforming plants.

Thirdly, transforming plants with Agrobacterium of plant expression vector containing F3'5' H gene

A single colony of agrobacterium carrying the plasmid pCAMBIA1301-35S-F3'5' H is selected, inoculated in a liquid culture medium for culture, centrifuged to collect thalli, and then suspended by an MS liquid culture medium. Infecting plant tissue which is easy to differentiate with suspended agrobacterium, then obtaining transgenic plantlet through tissue culture, and obtaining transgenic plant through screening with antibiotics.

Insertion condition and transcription level detection of F3'5' H gene in transgenic plant

To confirm that the transgenic plants obtained by antibiotic selection did contain the F3'5' H gene, the selected transgenic plants were further characterized using the 2XT5Direct PCR Kit (Plant) Kit. Firstly, genome DNA of a transgenic plant is extracted, then the plant genome DNA is used as a template, a specific primer of an internal fragment of F3'5' H gene is used for PCR detection, and analysis is carried out, and the structure is shown as figure 3.

In order to examine the expression condition of the F3'5' H gene in a transgenic plant containing the F3'5' H gene, total RNA is extracted from the transgenic plant, and is subjected to reverse transcription to synthesize cDNA for QPCR analysis, and the expression level of the F3'5' H gene in the transgenic plant is detected. And (3) taking the cDNA as a template, using F3'5' H gene specific primers as PCR, and using positive transgenic plants confirmed by QPCR for subsequent determination experiments of anthocyanin content and the like.

Fifth, experiment of transgenic plant color change

The F3'5' H gene-transferred and contrast wild type buds are cultured in a culture medium to form seedlings, the F3'5' H gene-transferred plant dendrobium officinale stalks and leaves show purple red, which indicates that the leaf spot art orchid F3'5' H gene really changes the plant color to achieve the expected effect, and various physiological indexes are measured to obtain a table 1, a figure 5 and a figure 6, the determination result and the experimental result of fig. 7 show that the F3'5' H gene in transgenic dendrobium officinale can be normally expressed, the growth condition of the transferred F3'5' H gene is stronger than that of a control plant (non-transgenic wild type), the transgenic plant is characterized by purplish red, the over-expression F3'5' H gene can greatly improve and increase the activity of the F3'5' H enzyme in the transgenic dendrobium officinale, the protein content and the soluble sugar content are increased, and the anthocyanin and flavonoid substance content is increased.

TABLE 1 morphological characteristics of transgenic Dendrobium officinale tissue culture seedlings

<110> Yunnan university of agriculture

Construction and application of plant expression vector of <120> leaf spot art orchid F3'5' H gene

<160>1

<170>SIPOSequenceListing 1.0

<210>1

<211>1512

<212>DNA

<213> leaf spot art orchid (Cymbidium)

<400>1

atgtctatct tcctcatcgc agccctcctg ctctgccttt tcctcctcct cctcctccgc 60

cgccgccgcg gttgtctccc cctccctcca ggaccaccta acttccctat ccttggcgct 120

ctgcccttca tcggccccat gccacactcc gctctcgctc tccttgcacg tcactacggc 180

cccatcatgt tcctcaagat gggcacccgg cgcgtcgtcg tagcgtcatc cgccgccgca 240

gctcgatcgt ttctcaaaac cctcgactcc cacttctccg accgccccac cggcatcatc 300

tccaaggaaa tcagctacaa cggccagaac atggtctttg ccgactacgg cccaaagtgg 360

aagctcctcc gcaaagtctc cagcctccat cttctcggtt ccaaggccat gtcccgttgg 420

tccggcgtgc ggcgcgatga ggccttctcc acgcttcaat tcttgaagaa tcggagcgat 480

tctggaaagc cggtgttgct tccgaattta ctggtttgtg ccatggcgaa tgtgataggg 540

aggatttcca tgagcaagag ggtatttgat gaggacggga aggaggcgaa ggagttcaag 600

gagatgatca aggagctttt ggttgggcag ggggcatcga atatcgggga tttggtgcct 660

gggatcaggt ggttggatcc gcagggagtg aggaagaaga tgctgggatt gaatcgcagg 720

tttgatagga tggtaagtaa gttgttggtg gagcacgctg agactgcagc ggagaggcag 780

gggaaccctg atctgttgga tcttatgatg gctaataaag taactggtga ggatggggag 840

gggctcaacg aggaaaacat caagggcttc atatctgatc tgttcgtagc ggggacggac 900

acgtccgcca tagtcataga gtgggcgatg gcggagatgc taaaaaatcc agcgatcctc 960

cgacgagcgc aagaggaaac cgaccgcgtc gtcggccgcc accgccttct cgacgaatcc 1020

gacataccga atctccccta cctccaagcc atctgcaagg aagctctgcg aaagcatccc 1080

ccaactcctc tcagcatacc tcactacgcc tccgagccct gcgaggtgga aggttacagc 1140

attccaggca agacatggct ctttgtcaac atatgggcca tcggccggga cccggacgtg 1200

tgggaggagc cgttggcgtt cgatccggag aggttcctgc aaggaaagat ggcgaagatt 1260

gatcccatgg gaaacgactt tgagctgata ccgttcggag cggggcggaggatttgcgcc 1320

gggaagttaa tggggatgct gatggtgcag tatttcttgg gaacattggt gcacgctttc 1380

gattggagtt tgccggaagg ggttggggaa ctggacatgg aggaagggcc ggggttggta 1440

ctgcccaagg ctgtgccgct gtcggtggtg gcgaggccga ggctcgcgcc ggcggcttat 1500

aggcttgatt aa 1512