Method for improving saponin content of ginseng germplasm

Abstract

The invention relates to a method of increasing ginseng germ plasm saponin content, belonging to the biotechnology field. The steps of the method are as follows: 1. the plant expression vector pBI-ACAS of reversal cycloartenol synthetase CAS gene is constructed; 2. agrobacterium rhizogene A4-ACAS with an objective vector is obtained by the conversion of a bacterial strain of the agrobacterium rhizogene A4 by pBI-ACAS; 3. a ginseng hairy root clone for expressing the reversal CAS gene is produced by mediating a ginseng root explant with the agrobacterium rhizogene A4; a test-tube plant is obtained through the body cell embryogenesis with the ginseng hairy root clone that has high ginseng saponin content and expresses the reversal CAS gene as a culture material. In the invention, the ginseng hairy root clone that has high ginseng saponin content and new genetic resources of ginseng test-tube plants are constructed, different applications can be realized; through large-scale liquid culture of the hairy root clone, high-yield ginseng saponin can be obtained directly. If a new ginseng line with high ginseng saponin content is cultured by regeneration plant, the new ginseng line can be used in the cultivate production, and can obviously shorten the breeding cycle of a ginseng.

Description

technical field [0001] The invention relates to the field of biotechnology, specifically a method for regulating the gene activity of key enzymes in the ginsenoside synthesis pathway and cultivating ginseng germplasm resources with high saponin content by means of genetic engineering. Background technique [0002] Ginseng is a perennial plant, generally blooms normally in 4 years, harvests in 6 years, and has a low reproductive coefficient (about 3). Conventional breeding needs more than 30 years, which seriously limits the process of ginseng breeding. Genetic improvement methods for quality saponin content are available. According to the mechanism that ginsenoside is synthesized by 2,3-oxidized squalene through a series of cyclization reactions, cycloaciool synthase (CAS) controls the flow of 2,3-oxidized spinachene to the sterol synthesis pathway, and dammarene Diol synthase controls the flow of 2,3-oxyspinaene to the ginsenoside synthesis pathway. [0003] The method of...

AI Technical Summary

Problems solved by technology

[0003] The method of using antisense RNA technology to express antisense RNA fragments that match the target mRNA in cells to inhibit the translation of mRNA and reduce the activity of enzymes controlled by the target gene, thereby changing the flow of biosynthetic metabolism has been successful. It is used in plant breeding and genetic improvement, but there is no relevant report on ginseng

Images