CN111518803A - RNAi fragment and application thereof in regulating and controlling lignin synthesis - Google Patents
RNAi fragment and application thereof in regulating and controlling lignin synthesis Download PDFInfo
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Abstract
The invention provides an RNAi fragment and application thereof in regulation and control of lignin synthesis, belonging to the technical field of plant genetic engineering.A modified DNA sequence shown as SEQ ID NO.1 is connected in a tail-to-tail mode to form the RNAi fragment, and the sequence of the RNAi fragment is shown as SEQ ID NO. 2. The RNAi fragment is applied to a transgenic plant, and the RNAi fragment is proved to have the function of regulating and controlling lignin synthesis. The invention is beneficial to promoting the genetic engineering breeding of the eucalyptus urophylla transgene directional regulation and control of lignin synthesis by researching the CAD gene sequence of the eucalyptus urophylla.
Description
Technical Field
The invention belongs to the technical field of plant genetic engineering, and particularly relates to an RNAi fragment and application thereof in regulation and control of lignin synthesis.
Background
The research of eucalyptus in Guangxi is in the leading position in China, the eucalyptus is introduced in the early stage of the 20 th century in the 70 th year, and a plurality of excellent tree species, excellent seed sources and excellent families are obtained through many years of introduction tests and hybrid breeding. The clone of Eucalyptus urophylla GLU4 (Eucalyptus urophylla clone GLU4) is a Eucalyptus fine variety widely planted in Guangxi, and is a preferred tree seed for paper pulp forestation because the pulping indexes such as cellulose content and cellulose length are obviously superior to other Eucalyptus varieties. Starting from the production requirement of the pulp, the oriented regulation of lignin synthesis due to the lower lignin content in the wood is expected, and the method becomes a main research strategy for improving the quality of the pulp. However, so far, no CAD gene sequence has been reported in eucalyptus urophylla, and gene engineering regulation by using the gene sequence has not been carried out.
Disclosure of Invention
In order to solve the technical problems, the invention provides an RNAi fragment and application of a plant expression vector, a host cell and the like obtained by constructing the RNAi fragment in regulation and control of lignin synthesis of a plant lignin monomer, so as to effectively and directionally regulate and control the lignin synthesis and play an important role in genetic engineering research of the lignin synthesis regulation and control.
In order to achieve the purpose, the invention provides the following technical scheme:
an RNAi fragment is composed of a section of improved DNA sequence derived from eucalyptus urophylla CAD gene in a tail-to-tail connection mode; the improved DNA sequence has a DNA sequence shown as SEQ ID NO. 1.
SEQ ID NO.1tggttgagtgccgcagaagctgtcgcccttgcaattccgaccag
Further, the DNA sequence of the RNAi fragment is shown as SEQ ID NO. 2.
SEQ ID NO.2
tggttgagtgccgcagaagctgtcgcccttgcaattccgaccag ctggtcggaattgcaagggcgacagcttctgcggcactcaacca
The invention provides a recombinant plant expression vector, which comprises the RNAi fragment.
Furthermore, the recombinant plant expression vector is a recombinant vector pCAMBIA3301-S2 constructed on the basis of pCAMBIA 3301.
The invention provides a host cell comprising the RNAi fragment or the recombinant plant expression vector.
Further, the host cell is an escherichia coli, agrobacterium or plant cell. Such as Escherichia coli JM109 strain, Agrobacterium LBA4404 strain.
The invention provides an application of RNAi fragments derived from CAD gene sequences of eucalyptus urophylla, which is to apply the RNAi fragments, the recombinant plant expression vectors or the host cells to the reduction of plant lignin synthesis.
Furthermore, the RNAi fragment or the recombinant plant expression vector is transformed into a plant, so that the plant lignin synthesis is directionally reduced.
Further, the host cell is infected into the plant. Reducing the lignin content of plants.
The invention has the following beneficial effects:
1. the invention abandons the idea of using full-length genes in the traditional research strategy, performs bioinformatics analysis on the CAD gene sequence of the eucalyptus urophylla, and selects a short DNA sequence according to the structural domain prediction of sequence coding protein and the analysis of the importance of the structural domain to the enzymatic activity, wherein the sequence coding protein contains Zn binding structural sites which are very important to the enzymatic activity of the CAD. And simultaneously, according to the result of homologous comparison analysis of the terrestrial plant CAD sequence, the sequence is subjected to base improvement to obtain an improved DNA sequence: SEQ ID NO. 1tgggttgagtgccgcagagctgtcgccccttgcaattccgaccag.
2. The improved DNA sequence obtained by the invention is used for constructing RNAi fragments, can efficiently identify Zn binding structure site target fragments in CAD genes, and causes RNA interference, inhibits the expression of the CAD genes, and reduces the activity of the CAD enzymes in plants.
3. In the application, only short DNA sequences are used to form RNAi fragments in a tail-to-tail connection mode, and the target RNAi fragments are obtained commercially in a sequence synthesis mode, so that the construction process of utilizing restriction enzymes in the traditional research strategy is avoided, the experimental steps are greatly simplified, and the experimental period is shortened.
4. The invention detects the lignin content of the tobacco plant transformed by the RNAi fragment, and the result shows that the lignin content in the transgenic tobacco plant is reduced by 11.44 percent compared with that of the wild tobacco, thereby verifying the regulation and control effect of the RNAi fragment on the lignin synthesis, proving that the RNAi fragment has the effect of inhibiting the lignin synthesis and can achieve the effect of reducing the lignin content of the plant.
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FIG. 1 is a photograph of a stem section of a wild type plant in an example of the present invention.
FIG. 2 is a photograph of a stem section of a transgenic plant according to an embodiment of the present invention.
Detailed Description
The following examples are given to facilitate a better understanding of the invention, but do not limit the invention. The experimental procedures in the following examples are conventional unless otherwise specified. The test materials used in the following examples were purchased from a conventional biochemical reagent store unless otherwise specified. In the following examples,% is by mass unless otherwise specified. The quantitative tests in the following examples, all set up three replicates and the results averaged.
Example 1 improvement of DNA sequence
Sequence analysis is carried out on a CAD gene sequence of eucalyptus urophylla by using Blastp, ProtParam, psipred and SWISS-MODEL bioinformatics software, a candidate DNA sequence (SEQID NO. 3: tggttgggtgccgcagaagctgtggcccttgcaattcggaccag) with a coding protein sequence rich in a Zn binding structural site is obtained by screening, on the basis of the candidate sequence, the candidate sequence and the CAD gene sequence of terrestrial plants are respectively paired by using online tools such as Blastn and the like, the candidate sequence is improved according to the analysis result of sequence homology and consistency, and a44 bp sequence S-2(SEQ ID NO.1) is obtained, and the sequence information is as follows: 5'-tggttgagtgccgcagaagctgtcgcccttgcaattccgaccag-3' are provided.
Example 2 construction of RNAi fragments
The sequence S-2 according to example 1 was designed in a "tail-to-tail" manner as an inverted repeat sequence S2(SEQ ID NO.2) with the sequence information:
5'–tggttgagtgccgcagaagctgtcgcccttgcaattccgaccagctggtcggaattgcaagggcgacagcttctgcggcactcaacca-3'。
example 3 construction of RNAi expression vector
After XhoI cleavage sites were added to both ends of the sequence S2 described in example 2, the sequence was synthesized by Biotech to obtain a cloning vector pUC57-S2 carrying the target fragment.
The overnight culture of the Escherichia coli carrying the pUC57-S2 plasmid was taken and the plasmid extraction was accomplished using a centrifugal column type common plasmid miniextraction kit (Tiangen). The plasmid is digested by XhoI enzyme, after the enzyme digestion product is detected by agarose gel electrophoresis, a target sequence S2 band of about 100bp is cut, and the band is recovered by a Universal DNA purification recovery kit (Tiangen). Meanwhile, digesting pCAMBIA3301 plasmid by XhoI enzyme to obtain a vector skeleton with bar gene sequences removed, connecting the vector skeleton with a target sequence S1, converting DH5a by a connecting product, carrying out PCR identification on a transformant by using sequencing primers 3301-F (5'-CCCTTATCTGGGAACTACTCAC-3')/3301-R (5'-CGCTGAAATCACCAGTCTCTC-3') on the vector, constructing a correct vector, amplifying to obtain a specific band about 200bp, sequencing clone extraction plasmids with correct length, comparing a sequencing result with the target sequence, and obtaining an RNAi vector which is successfully constructed and is named as pCAMBIA3301-S2, wherein the sequence is consistent.
Example 4 Regulation of tobacco Lignin Synthesis Using RNAi fragments
The pCAMBIA3301-S2 recombinant vector in example 3 was introduced into Agrobacterium LBA4404 by a conventional method, and positive strains were obtained by antibiotic plate screening, PCR identification and sequencing identification. Infecting tobacco leaves with agrobacterium liquid according to a conventional method, and culturing in stages of co-culture, differentiation, seedling strengthening, rooting, transplanting and the like to obtain transgenic tobacco seedlings.
After 8 weeks of transplanting, collecting the leaves of the plantlets to extract total DNA, carrying out PCR identification on the plantlets by using specific primers 3301-F/3301-R, successfully amplifying plants with about 200bp bands, further sequencing PCR products, comparing sequencing results with target sequences, and identifying the plants with consistent sequences as positive transgenic plants.
The transgenic plant has no obvious difference with the wild type in growth, the leaves of the plant are unfolded, the leaves are emerald green, the stems are straight, the seedling height reaches about 1.5m at the age of 8 months, and the plant blooms and fruits at the age of 10 months. Samples were collected at 8 months of age for phenotypic testing, including the following:
(1) detection of target Gene expression level
A tobacco actin gene (EU938079) is used as an internal reference gene, a tobacco CAD gene (X62343.1) is used as a target gene, a fluorescent quantitative detection primer is designed, the influence of RNAi fragments on the expression level of the target gene is detected, and the primer sequence is as follows:
actin-F CTGGAATCCATGAGACTACTTACAA；
actin-R AACCGCCACTGAGCACAATA；
CAD-F:GTATGGCACCAGAACAAGCAG；
CAD-R:CCAATGCCTCTTGTCTCTTCTTAT。
leaf tissue is collected at the 5 th node downwards from the stem tip of a transgenic tobacco plant, wild tobacco is used as a control, RNA extraction is carried out by adopting an RNA prep Pure polysaccharide polyphenol plant total RNA extraction kit, and then cDNA is synthesized by adopting an RNA LA PCR reverse transcription kit. The gene expression level was subjected to fluorescent quantitative PCR detection using ABI SybrGreen PCR Master Mix (2X) kit. The expression level of tobacco CAD gene was detected as shown in Table 1.
Table 1: analysis of CAD Gene expression levels in transgenic tobacco
| Plant numbering | Relative expression level of tobacco CAD gene |
| Wild type | 1.0131±0.0125 |
| Transgenic plant | 0.1270±0.0267 |
As can be seen from Table 1, when the transgenic plants are detected, the expression level of the tobacco CAD gene is detected to be reduced to 12.71% of that of the wild type, which indicates that the expression of the tobacco CAD gene is remarkably inhibited by the transferred RNAi fragments as expected.
(2) Stem lignin content detection
Selecting control and transgenic tobacco plants respectively, selecting sections 3 to 10 from the top end of a stem part downwards, removing leaves, cutting the stem into small sections, drying in a 60 ℃ oven for 24 hours, crushing, and sieving with a 150-mesh sieve for detecting the content of acid washing lignin. The method GB/T20805-2006 is adopted for measuring the content of the acid washing lignin. The results are shown in Table 2.
Table 2: lignin content in transgenic tobacco
| Plant numbering | Lignin content (%) |
| Wild type | 13.37±0.04 |
| Transgenic plant | 11.84±0.05 |
As can be seen from the test results in Table 2, the lignin in the transgenic plants is reduced by 11.44%.
(3) Change of stem diameter and xylem thickness of transformed plant
Taking the 6 th stem tissue from the 9-month-old tobacco with the downward top end of the stem, crosscutting the tissue by a conventional method to prepare a paraffin section, staining the paraffin section by a safranin-fast green method, and measuring the diameter of the stem and the thickness of xylem according to the section. The section of the wild type plant is shown in figure 1, and the section of the transgenic plant is shown in figure 2. The specific data are shown in Table 3.
TABLE 3 transformation of plant Stem diameter, xylem thickness variation
As can be seen from fig. 1, fig. 2, and table 3, which shows the measurement results of the stem diameter between the transgenic line and the wild type, no difference was significant, but the xylem thickness of the transgenic plant was reduced by 7.61% compared to the wild type. Illustrating the regulation effect of the RNAi fragment on lignin synthesis.
Example 5 transformation of recombinant vectors into plants to control tobacco Lignin Synthesis
The pCAMBIA3301-S2 recombinant vector of example 3 was extracted to obtain plasmid, and then mixed with gold powder according to a conventional method and bombarded on tobacco callus with a gene gun. According to a conventional method, the transgenic tobacco plantlets are obtained after culture in stages of hypertonic culture, recovery culture, differentiation, seedling strengthening, rooting, transplanting and the like.
After 8 weeks of transplanting, collecting the leaves of the plantlets to extract total DNA, carrying out PCR identification on the plantlets by using specific primers 3301-F/3301-R, successfully amplifying plants with about 200bp bands, further sequencing PCR products, comparing sequencing results with target sequences, and identifying the plants with consistent sequences as positive transgenic plants.
The obtained transgenic plant is compared with a wild type in growth, the appearance of the transgenic plant is not obviously different, the leaves of the plant are unfolded, the leaves are emerald green, the stems are straight, the seedling height reaches about 1.5m at the age of 8 months, and the plant blooms and fruits at the age of 10 months. Samples were collected at 8 months of age and used for phenotypic testing as in example 4, and the results obtained are similar to those of example 4, indicating that the results obtained by transforming the pCAMBIA3301-S2 recombinant vector of the present invention into plants are consistent with those obtained by infecting plants with the host and have reproducibility.
The above description is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Sequence listing
<110> Guangxi Zhuang nationality autonomous region forestry science research institute
<120> RNAi fragment and application thereof in regulation and control of lignin synthesis
<160>9
<170>SIPOSequenceListing 1.0
<210>1
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<213> Eucalyptus urophylla (Eucalyptus calophylla)
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<213> Artificial Sequence (Artificial Sequence)
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tggttgagtg ccgcagaagc tgtcgccctt gcaattccga ccagctggtc ggaattgcaa 60
gggcgacagc ttctgcggca ctcaacca 88
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<213> Eucalyptus urophylla (Eucalyptus calophylla)
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tggttgggtg ccgcagaagc tgtggccctt gcaattcgga ccag 44
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Claims (9)
1. An RNAi fragment, characterized in that it is composed of a modified DNA sequence derived from the CAD gene of Eucalyptus urophylla in a tail-to-tail connection manner; the improved DNA sequence has a DNA sequence shown as SEQ ID NO. 1.
2. The RNAi fragment of claim 1, wherein the DNA sequence of the RNAi fragment is represented in SEQ id No. 2.
3. A recombinant plant expression vector characterized by: comprising the RNAi fragment of claim 1 or 2.
4. The recombinant plant expression vector of claim 3, wherein the recombinant plant expression vector is pCAMBIA3301-S2, which is a recombinant vector constructed based on pCAMBIA 3301.
5. A host cell, characterized in that: comprising an RNAi fragment as defined in claim 1 or 2 or comprising a recombinant plant expression vector as defined in claim 3 or 4.
6. The host cell of claim 5, wherein: the host cell is escherichia coli, agrobacterium or plant cell.
7. Use of an RNAi fragment for modulating lignin synthesis, wherein the RNAi fragment of claim 1 or 2, the recombinant plant expression vector of claim 3 or 4, or the host cell of claim 5 or 6 is used to reduce lignin synthesis in a plant.
8. The method of claim 7, wherein the RNAi fragment or the recombinant plant expression vector is transformed into a plant to direct the reduction of lignin synthesis in the plant.
9. The method of using the RNAi fragment of claim 7 for modulating lignin synthesis, wherein the host cell is infected into a plant.
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