42results about How to "Solve the problem of germplasm degradation" patented technology

The invention is a virus removal and rapid propagation technology of sweet potato variety 'Shangshu 19', comprising the following steps: selecting plants which are robust without diseases and insect pests and have characteristics of the variety from growing plants; clipping stem with stem tip; removing visible leaves; sterilizing; peeling the stem tip with 1-2 leaf primodia via a dissecting needle; quickly inoculating into a differentiation and induction culture medium; trimming the sterilized seedling into stem segments with 1-2 internode(s) and switching into an enrichment medium after virus detection; selecting sterilized seedling in vigorous growth to cut into small segments with 1-2 internode(s) and switch into a rooting medium; carrying out domestication on seedling after rooting. The invention has stem tip in virus removal and stem segment in rapid propagation, solves the problems of severe virus disease for sweet potato, poor quality of new cultured breed, germplasm degradation, low yield and the like propagated by using sweet potato block and stem. The invention can artificially control the growing conditions, can not be influenced by nature, and has the advantages of small amount of material use, economical culturing materials, short growth cycle, large propagation coefficient and convenient management and is favor of industrial production.

The invention relates to a method for rapidly breeding sugarcane stem tip by tissue culture and virus removal, belonging to the technical field of rapid breeding of plant by virus removal. The method comprises the following steps: carrying out disinfection pretreatment on a terminal bud of sugarcane and a cut double-bud stem section, with the terminal bud of the sugarcane and a stem tip tissue ofan axillary bud as explants, and carrying out stem tip initial culture, sprout differentiation culture, crowd sprout strong stock culture, plant root culture and virus checking by adopting a filter paper bridge culture way, thus massive virus-removed tissue culture seedlings are obtained. The invention has the advantages: the stem tip with the length of 1-2mm is taken as the explant, thus the processing operation is easy; the filter paper bridge culture way is adopted during the initial culture, thus the initiating speed is high and the perennial root dwarfing virus removing effect is thorough; and the stem tip is induced and germinated and is rapidly initiated and differentiates massive crowd sprouts, the month breeding coefficient reaches 5-8, and normomorph is realized in a long-term breeding process, thus the method is completely applicable to factory production on a large scale.

The present invention relates to an artificial incubation method of fertilized egg of tilapia mossambica. It is characterized by that the male and female paired breeding of tilapia mossambica is implemented in net cage, then said invention adopts the following several steps: checking mouth cavity of female fish, if in the mouth cavity of female fish the fertilized eggs are existed, opening mouth cavity of female fish, taking out fertilized eggs and pouring them into a landing net; using saline water to wash said fertilized eggs and placing said fertilized eggs into an incubator; making the fertilized eggs be floated in the water of said incubator and making incubation for 2-7 days so as to obtain the tilapia mossambica fries.

The invention relates to a method for detoxifying and reproducing helianthus tuberosus quickly. The method comprises the following steps of: disinfecting young axillary buds or stem tips serving as explants, transferring the young axillary buds or stem tips into a bud induction culture medium, transferring the buds into a rooting culture medium, and performing refining seedlings and transplanting on a complete plant, wherein the bud induction culture medium is improved on the basis of a Murashige and Skoog (MS) culture medium, 0.1 mg.L<-1> of naphthyl acetic acid (NAA) and 0.5 mg.L<-1> of 6-butyl acrylate (BA) are added, so that adventitious buds which are induced are more, callus is small, and the problems of vitrification and water stain are solved; and obtained seedlings are robust and vigorous in growth vigor and can be transferred into the rooting culture medium directly, the rooting rate is 100 percent, and the survival rate of test-tube seedlings is over 90 percent. By the method, the effect of detoxifying the helianthus tuberosus seedlings can be achieved, the reproduction efficiency is improved, the production period is shortened, and an effective path is provided for the large-scale seedling raising of the helianthus tuberosus.

The invention discloses an application method for ecologically breeding macrobrachium nipponensis and Odontobutis obscura in a pond by utilizing an artificial ecological base. The method comprises the following steps of (1) pond selection; (2) forming of pond artificial ecological base layout and biological film; (3) fry stocking; (4) feedstuff feeding; (5) water quality regulation and control and daily management; (6) fishing of grown macrobrachium nipponensis and grown Odontobutis obscura. Compared with the prior art, according to the method, the water quality of the pond can be kept good and stable, water does not need to be replaced in the whole breeding period except in the season with higher water temperature, new water is added to increase the water level, no breeding wastewater is drained, and the ecological benefits are obvious; the biocenosis such as microorganisms and algae on the ecological base can provide the suitable habitat for shrimp seeds and the Odontobutis obscura; the Odontobutis obscura is utilized for catching and feeding on the weak and sick shrimp seeds and autumn seeds bred in august; the breeding disease rate of the macrobrachium nipponensis is reduced; the out-of-pond specification and yield of the grown macrobrachium nipponensis are improved, and the economic benefits are obvious.

The present invention relates to a male and female mating propagation method of tilapia, in specific to a mating propagation of tilapia which can adopt the pattern of male mating female; the method belongs to the technical field of aquatic product breeding. The method is characterized in that a net cage is equipped in an outdoor pond or indoor concrete pond; adult male tilapias are selected and people cut the upper jaw of the tilapias and put the tilapias into the net cage after being sterilized; and then adult female tilapias are selected to put in the net cage for mating culture and people can see the zygotes in the mouths of female tilapias after 7 to 10 days. With the present invention, a tilapia family line can be established for the family breeding of tilapias. In addition, people can clearly know the relation between the offspring and parent to control the inbreeding and avoid the germ plasm degeneration of offspring.

The invention aims at solving the problems that seed propagation adopted in current polygonatum sibiricum red production is difficult, plant diseases and insect pests can easily become more serious and germplasm can be easily degenerated during the conventional rhizome propagation, tissue culture mainly takes terminal buds of rhizome and stem tips as explants for establishing a rapid propagation system, source of the explant is single, test material consumption is high and propagation efficiency is low. According to the method provided by the invention, easily available polygonatum kingianum terminal bud scales are selected as an explant test material, adventitious roots are obtained by inducing bud scale differentiation, and then further induction is carried out on the adventitious roots, so that differentiation bodies of different types such as rhizomes having adventitious roots and terminal buds at the same time, adventitious bud clumps and callus tissues in multiple forms are obtained; and respectively continuously culturing the differentiation bodies of different types, so that new adventitious bud clumps, rhizomes with terminal buds and callus tissues of multiple types can be respectively continuously produced, and an in vitro high-frequency regeneration system for roots, stems and leaves of polygonatum sibiricum red is established; a high-frequency regeneration system for the roots and stems can also be obtained by adopting the same culture medium. The roots, stems, leaves, callus tissues and rhizomes obtained by utilizing the method can be mutually transformed and grow in different culture stages.

The invention relates to a seedling-raising way for algae, in particular to a seedling-raising method for gracilaria algae. The method comprises the following steps: disinfecting cleaned mature gracilaria algae with sodium hypochlorite for 3-5 minutes, flushing the disinfected gracilaria algae with boiled fresh water, and putting the flushed gracilaria algae into boiled seawater for serving as breeding algae in later use; drying the breeding algae in the shade, stimulating, releasing spores, growing a disk-shaped body, performing suspension cultivation after scraping the disk-shaped body, performing enlarged cultivation, inducing the formation of vertical branches, and performing gradual cultivation to prompt growth of seedlings. By adopting the seedling-raising method, the entire spore seedling-raising process is implemented in a relatively small and controllable three-dimensional space, the seedling-raising amount is large, the survival rate is up to 90-100 percent, seedlings grow rapidly, the emergence rate is high, and gracilaria seedlings which are uniform in size and are 5 centimeters in length can be cultivated within 30-60 days.

The invention discloses a method for strong seedling and rooting culture of strawberries, which includes the following steps: firstly, strong seedling and rooting culture: a multiple shoot with a prophyll and 0.3-0.5 cm in height and well in growth and development is cut into a single plant and transplanted to a strong seedling and rooting culture medium for rooting culture, and transplanting is carried out after the plant is 3-5 cm in height; secondly, transplantation: the plant is firstly transplanted to a culture room and grows for 30-35 d, then is transplanted in a plastic-covered tunnel with a shading net, after a new root grows and the plant sprouts, watering frequency is gradually reduced, and the plant is transplanted to a flowerpot for ordinary management. The method for strong seedling and rooting culture of strawberries, provided by the invention, improves the survival rate of transplanted plants by 90% above through supporting measures such as improvement on minimal medium and ingredients and adjustment in culture conditions, enables seedlings to grow healthy, effectively solves the problem of genetical characterization decline of fine seedlings, effectively improves yield and quality of strawberries and enhances the economic value of strawberries at the same time.

The invention provides a cowberry detoxification breeding method. The cowberry detoxification breeding method comprises the following steps: accelerating germination of cowberry resting shoots, shearing off a bud when the length of the bud reaches 1-3 cm and carrying out sterilizing treatment; cutting off 0.3-0.8 cm of a stem tip from the sterilized bud, and inoculating the stem tip on a foundational medium, and culturing under the conditions that the temperature is 25-28 DEG C, the illumination intensity is 1,800-2,200 Lx, and the illumination time is 12-16 h/d; after the stem tip grows until the length of the stem tip reaches 1.5-2.0 cm, cutting off 0.03-0.05 cm of a stem tip in a sterile environment and inoculating the stem tip to a detoxification medium, carrying out dark culture for 5-9 days at the temperature of 22-25 DEG C, and continuing culturing in an environment in which the temperature is 23-26 DEG C, the illumination intensity is 1,800-2,200 Lx and the illumination time is 12-16 h/d; and inoculating a detoxification seedling to a medium, carrying out rapid multiplication culture, and then carrying out seedling hardening and rooting after the length of the seedling reaches 2.0-3.0 cm.

The invention relates to a rapid propagation method of rhizomes of Enshi polygonatum sibiricum. Aggravation of disease and insect damage and germplasm degradation easily occur in conventional rhizomepropagation, a rapid propagation system is established with rhizome terminal buds and stem tips used as explants in tissue culture, more available polygonatum sibiricum terminal bud scales are selected as explants test materials in consideration of the current situations of single explants source, large test material consumption and low propagation efficiency, adventitious roots are obtained by inducing bud scale differentiation, the adventitious roots are further induced to produce different types of differentiated bodies such as rhizomes with adventitious roots and terminal buds, adventitious bud clusters and calluses in multiple forms. Those types of differentiated bodies are continuously cultured respectively in Enshi and can continuously produce new adventitious bud clusters, rhizomeswith terminal buds and multiple types of calluses, so that a high-frequency regeneration system of excised roots, stems and leaves of polygonatum sibiricum is established. Roots, stems, leaves, calluses and rhizomes which are obtained with the method can be converted to grow in different culture periods.

The invention provides a bud initiation culture medium of pear tree somatic embryos. The bud initiation culture medium comprises 1/2 improved SH, 0.5-0.8mgL<-1> of 6-BA, 3-5mgL<-1> of 2,4-D, 0.1-0.2mgL<-1> of NAA, 6.0-7.0gL<-1> of agar, 30gL<-1> of sucrose and 0.1-0.3% of phytagel and has pH value of 5.8-6.0. The bud initiation culture medium has the beneficial effects that pear trees difficult to propagate are rapidly propagated through somatic embryogenesis by improving a basic culture medium and components and adjusting the culture conditions; the plant transplanting survival rate is more than or equal to 96%; seedlings grow robustly, thus the problem of germplasm degeneration of good seedlings can be effectively solved, plenty of high-quality purified and rejuvenated seedlings can be also provided for production and an ideal receptor system can be also provided for breeding new varieties through genetic transformation or mutation breeding of the pear trees.

The invention discloses application of a molecular marker based on a TYRP1 gene in giant salamander body color breeding, the nucleotide sequence of a giant salamander TYRP1 gene coding region is cloned for the first time, the full length is 1584bp, 527 amino acid residues are coded, and a tyrosinase (177-411 amino acid) functional structure domain is included; detecting the expression profile difference of the TYRP1 gene in tissues with different body colors and skin tissues with different body colors of the wild giant salamander by adopting a real-time fluorescent quantitative PCR (Polymerase Chain Reaction) technology; complete sequences of CDS regions of TYRP1 genes with different body colors are compared to find that TYRP1 genes of yellow body color individuals have two nucleotide insertion sites, so that a decoding frame is changed, and an amino acid sequence is interrupted. The invention provides an effective molecular marker for directional breeding of giant salamander body color, provides a method for researching a molecular genetic basis and a cell metabolism mechanism formed by body color diversity, is beneficial to breeding of new giant salamander strains, and solves the problem of germplasm degeneration of giant salamanders.

The invention discloses a complete set culture medium for the induction of cotyledon somatic embryos of Chinese scholartree. The complete set culture medium comprises a somatic embryo induction culture medium, an adventitious bud induction culture medium, a strong seedling culture medium and a rooting culture medium. When the culture medium disclosed by the invention is used for propagating Chinese scholartree seedlings, one step of establishing a Chinese scholartree rapid propagation and regeneration system can be saved, so that time is greatly shortened. The regeneration rate is high, more buds are germinated, and the plant transplanting survival rate can reach more than or equal to 90%; germchits grow healthily; and the germplasm degeneration problem of the high-quality germchits can be effectively solved, and an ideal receptor system also can be provided for genetic transformation or mutation breeding of the Chinese scholartree.

The invention relates to an artificial planting method for Vernonia anthelmintica. The artificial planting method comprises the following steps: seed selection, selection of proper lands, soil preparation, sowing, final singling, field management and fruit harvesting. The method is simple and convenient, the planting cost is lowered, the method is easily grasped by planters, the yield of fruits (seeds) of the Vernonia anthelmintica is increased, the method is suitable for industrialized cultivation of the Vernonia anthelmintica, and a foundation is laid for breeding and intermediate propagation of fine varieties of the Vernonia anthelmintica. According to the method, the key problems of variety breeding, large-scale artificial planting and seed-breeding of the Vernonia anthelmintica whichis suitable for Hetian Prefecture and high in biomass, fruit yield and contents of effective components, real-time evaluation criterions of the quality of a planting process, development of high-value-added products, comprehensive utilization of resources and the like are emphatically solved.