A kind of construction method of monocot miRNA efficient overexpression vector

Abstract

The invention belongs to the field of biotechnology, and discloses a method for constructing a high-efficiency monocot miRNA overexpression vector, comprising the following steps: S1, preparing a linking sequence corresponding to the target miRNA; S2, cloning the linking sequence described in S1 To the cloning vector, to obtain the promoter-junction-terminator structure; S3, the stem-loop structure for overexpressing the target miRNA is introduced into the promoter-junction-terminator structure of S2, so that it has at least Two stem-loop structures; S4, the promoter-junction sequence-terminator structure obtained by S3 is cloned into a binary vector by double enzyme digestion. The invention has high connection efficiency, simple and easy operation, avoids the introduction of unnecessary transgenic components, is beneficial to the research on the function of miRNA in monocotyledonous plants, and is more conducive to the phenotype observation and result interpretation of subsequent transgenic plants.

Description

technical field [0001] The invention relates to the field of biotechnology, in particular to a method for constructing a high-efficiency monocot miRNA overexpression vector, which can be used for the research on the function of the monocot miRNA. Background technique [0002] Plant microRNA (miRNA) is a kind of endogenous small non-coding RNA (small non-coding RNA) with a length of about 20-24 nt, which can combine with Argonaute (AGO) protein to form a RISC complex (RNA-induced silencing complex). Directly cut the mRNA of the target gene or inhibit the translation of the target gene, and indirectly act on the target gene mRNA by cutting a large number of phasiRNAs generated from the transcripts derived from the PHAS site, thereby inhibiting the expression of the target gene, thereby affecting the growth and development of the plant. It mainly includes root formation, stem and leaf development, floral organ formation, fruit development, etc., as well as responses to biotic a...

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Problems solved by technology

[0004] In order to overcome the problem of insufficient expression of the target miRNA in the traditional plant miRNA overexpression method and the problem that the phenotype of the overexpressed plant is not obvious, the inventors found that the maize Ubi promoter is highly expressed in monocotyledonous plant tissues, while in dicotyledonous plants it is not Weaker, based on this, a method for constructing a high-efficiency monocot miRNA overexpression vector is proposed, which includes the following steps: S1, for the target miRNA, preparing a corresponding linking sequence;

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