阅读说明：本技术 一种生姜组织培养的方法 (Ginger tissue culture method ) 是由 刘燃 吴林 王显凤 李洪海 刘静 田庆忠 姜玉松 于 2021-01-08 设计创作，主要内容包括：一种组织培养快速繁殖生姜的方法,其特征在于：是取生姜茎尖预处理后置于缓释培养基上诱导产生丛生芽,随后在缓释培养基中加入NH-4NO-3浓度减半的MS基础培养基,并补加0.5～1mg/L的PP-(333),持续培养获得带根苗；所述的缓释培养基是MS基础培养基中补充6-BA 0.5～1.5mg/L、NAA缓释生长素2～3mg/L、TDZ 0.25～0.3mg/L,2%蔗糖,琼脂0.55～0.65%,调节pH为5.8～6。本发明通简化了组织培养步骤,缩短了培养时间,提高了芽苗成活率和脱毒率,成活率达到96%,脱毒率达到100%,同时防止了生姜组织培养过程中产生变异,增殖系数显著提高,达到5.13,生根率达到97.7%,培育健壮的生姜带根苗。(A method for tissue culture and rapid propagation of ginger is characterized in that: pretreating stem tip of ginger, placing the pretreated stem tip on a slow-release culture medium to induce the ginger to generate cluster buds, and then adding NH into the slow-release culture medium 4 NO 3 MS basal medium with half-reduced concentration and 0.5-1 mg/L PP (propene Polymer) is supplemented 333 Continuously culturing to obtain seedlings with roots; the slow release culture medium is prepared by supplementing 6-BA 0.5-1.5 mg/L, NAA slow release auxin 2-3 mg/L, TDZ 0.25-0.3 mg/L, 2% sucrose and agar 0.55-0.65% in an MS basic culture medium, and adjusting the pH to 5.8-6. The method simplifies the tissue culture steps, shortens the culture time, improves the survival rate and the detoxification rate of the bud seedlings, the survival rate reaches 96 percent, the detoxification rate reaches 100 percent, prevents the variation generated in the ginger tissue culture process, remarkably improves the multiplication coefficient to 5.13, achieves the rooting rate of 97.7 percent, and cultivates the healthy ginger rooted seedlings.)

1. A method for tissue culture and rapid propagation of ginger is characterized in that: pretreating ginger stem tips with the size of 0.6-0.8 cm, placing the pretreated ginger stem tips on a slow-release culture medium to induce the ginger stem tips to generate cluster buds, and then adding NH into the slow-release culture medium₄NO₃MS basal medium with half-reduced concentration and 0.5-1 mg/L PP (propene Polymer) is supplemented₃₃₃Continuously culturing to obtain seedlings with roots; the slow release culture medium is prepared by supplementing 6-BA 0.5-1.5 mg/L, NAA slow release auxin 2-3 mg/L, TDZ 0.25-0.3 mg/L, 2% sucrose and agar 0.55-0.65% in an MS basic culture medium, and adjusting the pH to 5.8-6; the NAA slow release auxin is prepared by mixing nano SiO₂Dispersing in an ethanol-removed ionic water solution, adding NAA, adding PVP k30, mixing, heating to 80-90 ℃, keeping the temperature for 20-30 min, stopping heating, cooling to room temperature, filtering, and drying.

2. The method for tissue culture of rapidly propagating ginger as claimed in claim 1, wherein: the nano SiO₂The mass ratio of NAA to PVP k30 is 4-6: 1: 0.03 to 0.08.

3. The method for tissue culture of rapidly propagating ginger as claimed in claim 1 or 2, wherein: the pretreatment is to soak ginger stem tips of 0.6-0.8 cm in ethanol with the volume concentration of 70% for 30-40 s, then to wash with sterile water, to repeatedly soak with the same ethanol once, and to heat at 50 ℃ for 5-8 min after the sterile water washing.

4. The method for tissue culture of rapidly propagating ginger as claimed in any one of claims 1 to 3, wherein: adding NH into the slow release culture medium₄NO₃While the MS basic culture medium with the concentration reduced by half is supplemented with 2 percent of sucrose and 0.6 percent of agar and NH according to the addition amount of the MS basic culture medium₄NO₃The volume ratio of the MS basal medium with the halved concentration to the slow-release medium is 1: 3.

5. The method for tissue culture of rapidly propagating ginger as claimed in claim 1, wherein: the culture is specifically carried out in a dark room at 28 ℃ and with the relative humidity of 60-70% until white and green callus and bud seedlings grow out, when the bud seedlings grow to 4-5 cm, upper leaves and leaf sheaths of the bud seedlings are cut off, the bud seedlings are placed in a culture medium again, the bud seedlings are continuously cultured for 24 hours under the illumination intensity of 1500-1800 Lux, then the bud seedlings are cultured for 24 hours under the non-illumination environment, and the bud seedlings are alternately cultured to obtain the propagated rooting seedlings.

6. A method for tissue culture and rapid propagation of ginger is characterized by comprising the following steps:

pretreatment: soaking ginger stem tips with the size of 0.6-0.8 cm in ethanol with the volume concentration of 70% for 30-40 s, then washing with sterile water, repeating the same ethanol soaking once, and performing heat treatment at 50 ℃ for 5-8 min after the sterile water washing;

inoculating and culturing

(1) Inoculating the pretreated ginger stem tip into a slow-release culture medium for primary culture, wherein the slow-release culture medium is prepared by supplementing 6-BA 0.5-1.5 mg/L, NAA slow-release auxin 2-3 mg/L, TDZ 0.25.25-0.3 mg/L, 2% sucrose and agar 0.55-0.65% in an MS basal culture medium and adjusting the pH to 5.8-6;

wherein the NAA slow release auxin is nano SiO₂Dispersing in ethanol-removed ionic water, adding NAA, adding PVP k30, mixing, heating to 80-90 deg.C, keeping the temperature for 20-30 min, stopping heating, cooling to room temperature, filtering, and drying to obtain SiO₂The mass ratio of NAA to PVP k30 is 4-6: 1: 0.03 to 0.08;

(2) culturing in a dark room at 28 ℃ and a relative humidity of 60-70% until white and green callus and bud seedlings grow, cutting off upper leaves and leaf sheaths of the bud seedlings when the bud seedlings grow to 4-5 cm, putting the bud seedlings in a culture medium again, and adding NH (NH) supplemented with 0.2% of sucrose and 0.6% of agar into the culture medium₄NO₃MS basal medium with half-reduced concentration and 0.5-1 mg/L PP (propene Polymer) is supplemented₃₃₃The MS basal culture medium and the slow-release culture medium have the volume ratio of 1:3, the same temperature and humidity are kept, the MS basal culture medium and the slow-release culture medium are continuously cultured for 24 hours under the illumination intensity of 1500-1800 Lux, and then the MS basal culture medium and the slow-release culture medium are cultured for 24 hours under the non-illumination environmentCulturing to obtain the propagated rooting seedling.

Technical Field

The invention relates to the technical field of tissue culture, in particular to a ginger tissue culture method.

Background

Ginger is a perennial herb plant of the genus zingiberaceae, which is a perennial herb and is a major source of planting in many areas of China. The ginger is an economic plant used as both medicine and food, and has the effects of sweating, relieving exterior syndrome, warming middle-jiao, arresting vomiting, warming lung, relieving cough, relieving fish and crab toxicity, and the like. China is one of the origins and major producing countries of ginger, and has a history of more than two thousand years of cultivation. Traditional ginger production is characterized in that strong and disease and pest free rhizomes are selected in harvest seasons for cellaring, germinated seed gingers are cut into blocks for planting in the next year, serious waste exists in the mode, more manpower and material resources are needed, moreover, because gingers do not bloom or rarely bloom, only vegetative propagation and long-term vegetative propagation can be adopted, accumulation and propagation of virus diseases (such as cucumber mosaic virus, bacterial wilt, fusarium and root-knot nematode) are caused, a large amount of yield reduction of gingers is caused, quality degradation and stress resistance reduction of gingers are caused, in China, a large amount of reports are concentrated on ginger blast caused by pseudomonas solanacearum, particularly in ginger main-producing areas, continuous cropping cultivation in long years, the field morbidity is as high as 70-80% when the field morbidity is serious, the quality of gingers infected with viruses is poor, leaves are shriveled, the ginger grows slowly, the yield is generally reduced by 30-80%, and even extremely harvested, and the ginger production becomes high-yield, The main impediment to obtaining high benefits. The virus-free seedling obtained by adopting the stem tip tissue culture technology can reduce the influence of virus.

The key point in the stem tip culture process is to ensure excellent detoxification effect and meet the requirement of high induced seedling rate. However, the existing tissue culture is not suitable for tissue culture of ginger, is difficult to induce the ginger to generate callus and cluster buds, is slow in propagation, is easy to brown, is low in induction survival rate and easy to rot seedlings, and has the problem of variation easily in a complicated culture process, so that the problems of low propagation coefficient, low rooting rate, easy generation of abnormal seedlings and the like exist in the aspect of ginger tissue culture.

Disclosure of Invention

In view of the above, the present invention aims to provide a method for tissue culture of ginger. The method simplifies tissue culture steps, has high induction survival rate, improves propagation coefficient of rhizoma Zingiberis recens, and has detoxification rate up to 100%.

The purpose of the invention is realized by the following technical scheme:

a method for tissue culture and rapid propagation of ginger is characterized in that: pretreating ginger stem tips with the size of 0.6-0.8 cm, placing the pretreated ginger stem tips on a slow-release culture medium to induce the ginger stem tips to generate cluster buds, and then adding NH into the slow-release culture medium₄NO₃And (3) reducing the concentration of the MS basic culture medium by half, supplementing 0.5-1 mg/L of PP333, and continuously culturing to obtain the seedling with the root.

The slow release culture medium is prepared by supplementing 6-BA 0.5-1.5 mg/L, NAA slow release auxin 2-3 mg/L, TDZ 0.25-0.3 mg/L, 2% sucrose and agar 0.55-0.65% in an MS basic culture medium, and adjusting the pH to 5.8-6.

TDZ has the function of cytokinin, and has two functional groups in the molecule: phenyl and thiadiazole, in the induction reaction, two cyclic groups play a mutual promotion role, and the growth rate of the induced callus is dozens of times of that of other growth regulators, so that the low-concentration TDZ of 0.25-0.3 mg/L in the culture medium has the effect of quickly starting the growth of the callus, and on the other hand, the existence of the TDZ inhibits the activity of cytokinin oxidase (the only enzyme which can irreversibly inactivate the cytokinin) in the stem tip of ginger, and ensures that the 6-BA keeps the high-efficiency activity in the tissue culture process.

In the process of ginger tissue culture, effective proliferation and a large number of roots are difficult to induce simultaneously, so that the germination is difficult to induce simultaneously when the roots are induced, or the efficient induced germination is ensured, but the roots are few, therefore, the method of sequential culture in the processes of induction, proliferation and rooting is adopted in the field; in the initial stage of tissue culture, because the low auxin (NAA) concentration and the relatively high cytokinin concentration (6-BA and TDZ) are quickly started and promote the efficient proliferation of cluster buds, the NAA concentration gradually rises along with the slow release of the NAA, the ratio of the cytokinin to the auxin is reduced, the rooting is facilitated, and the proliferated buds gradually take roots, so that a large number of rooted seedlings are induced.

Further, the NAA slow release auxin is prepared by mixing nano SiO₂Dispersing in an ethanol-removed ionic water solution, adding NAA, adding PVP k30, mixing, heating to 80-90 ℃, keeping the temperature for 20-30 min, stopping heating, cooling to room temperature, filtering, and drying.

The PVP high polymer chain contains rich carbonyl oxygen, the surface of the silicon dioxide contains a large number of silicon hydroxyl, hydrogen in the silicon hydroxyl and the carbonyl oxygen form hydrogen bonds, thus agglomeration is generated to form nano microspheres, auxin NAA is effectively wrapped in the microspheres, and the nano SiO is coated on the surface of the PVP high polymer chain₂When the compound NAA is added into the culture medium, SiO₂Has slow release effect on NAA, thereby controlling the concentration of NAA in the culture medium to slowly rise to achieve the effect of high-efficiency induction, and then SiO₂Provides a stable weak acid environment for the NAA, not only promotes the NAA to effectively enter the ginger cells, but also effectively improves the binding strength of the NAA to the specific binding sites of the plasma membrane. In which PVP is used as a binder for SiO during the compounding process₂The poly-p-NAA is wrapped, so that the effective slow release of the NAA is realized, and the callus is inhibited from browning and dying in the culture medium.

Further, the nano SiO₂The mass ratio of NAA to PVP k30 is 4-6: 1: 0.03 to 0.08.

Further, the ethanol water solution is composed of ethanol and purified water with the volume ratio of 1:1, and the nano SiO is₂And the mass-to-volume ratio of the ethanol aqueous solution is 1 g: 10-15 mL.

Further, the pretreatment is to soak ginger stem tips of 0.6-0.8 cm in ethanol with the volume concentration of 70% for 30-40 s, then to wash with sterile water, repeat the same ethanol soaking once, and to heat at 50 ℃ for 5-8 min after the sterile water washing.

Because the fleshy rhizome of the ginger grows in the soil, the explant has a large amount of bacteria and is difficult to sterilize, the traditional method adopts mercury bichloride treatment or a large amount of antibiotics treatment, although the pollution rate of the ginger can be reduced to achieve the sterilization effect, the problem of the reduction of the survival rate is also accompanied, and browning is easy to occur. Therefore, the stem tip of the ginger is controlled to be 0.6-0.8 cm, and the ginger is repeatedly soaked for 2 times by adopting ethanol and treated at a higher temperature, so that an excellent sterilization effect is achieved.

Further, NH is added into the slow release culture medium₄NO₃And (3) adding 2% of sucrose and 0.6% of agar according to the addition amount of the MS basal medium while the concentration of the MS basal medium is reduced by half, wherein the volume ratio of the MS basal medium to the slow-release medium is 1: 3.

During the culture process, the ginger is easy to have the phenomena of leaf yellowing and malformation, so the invention adopts the way of adding NH₄NO₃The MS basal medium with half-reduced concentration reduces the concentration of 6-BA, NAA and TDZ in the medium, and reduces the occurrence of vitrified seedlings and etiolated seedlings.

Further, the culture is specifically carried out in a dark room at 28 ℃ and a relative humidity of 60-70% until white and green callus and bud seedlings grow out, when the bud seedlings grow to 4-5 cm, upper leaves and leaf sheaths of the bud seedlings are cut off, the bud seedlings are placed in a culture medium again, and NH is added₄NO₃After the MS basic culture medium with the concentration reduced by half and 0.5-1 mg/L PP333, continuously culturing for 24 hours under the illumination intensity of 1500-1800 Lux, culturing for 24 hours under the non-illumination environment, and alternately culturing to obtain the propagated rooting seedlings.

Most specifically, the method for tissue culture and rapid propagation of ginger is characterized by comprising the following steps:

pretreatment: soaking ginger stem tips with the size of 0.6-0.8 cm in ethanol with the volume concentration of 70% for 30-40 s, then washing with sterile water, repeating the same ethanol soaking once, and performing heat treatment at 50 ℃ for 5-8 min after the sterile water washing;

inoculating and culturing

(1) Inoculating the pretreated ginger stem tip into a slow-release culture medium for primary culture, wherein the slow-release culture medium is prepared by supplementing 6-BA 0.5-1.5 mg/L, NAA slow-release auxin 2-3 mg/L, TDZ 0.25.25-0.3 mg/L, 2% sucrose and agar 0.55-0.65% in an MS basal culture medium and adjusting the pH to 5.8-6;

whereinThe NAA slow release auxin is prepared by mixing nanometer SiO₂Dispersing in ethanol-removed ionic water, adding NAA, adding PVP k30, mixing, heating to 80-90 deg.C, keeping the temperature for 20-30 min, stopping heating, cooling to room temperature, filtering, and drying to obtain SiO₂The mass ratio of NAA to PVP k30 is 4-6: 1: 0.03 to 0.08;

(2) culturing in a dark room at 28 ℃ and a relative humidity of 60-70% until white and green callus and bud seedlings grow, cutting off upper leaves and leaf sheaths of the bud seedlings when the bud seedlings grow to 4-5 cm, putting the bud seedlings in a culture medium again, and adding NH (NH) supplemented with 0.2% of sucrose and 0.6% of agar into the culture medium₄NO₃MS basal medium with half-reduced concentration and 0.5-1 mg/L PP (propene Polymer) is supplemented₃₃₃The MS basal culture medium and the slow-release culture medium have the volume ratio of 1:3, the same temperature and humidity are kept, the MS basal culture medium and the slow-release culture medium are continuously cultured for 24 hours under the illumination intensity of 1500-1800 Lux, and then the MS basal culture medium and the slow-release culture medium are cultured in an alternate culture mode of 24 hours under the non-illumination environment to obtain the proliferated rooting seedlings;

the invention has the following technical effects:

the invention wraps NAA with nano SiO₂In the process, NAA is slowly released in the tissue culture process of ginger, so that the concentration of a growth regulator in culture media at different stages is gradually changed to adapt to cluster bud culture, propagation seedling culture and rooting seedling culture in one culture medium, the tissue culture steps are simplified, the culture time is shortened, the survival rate and the detoxification rate of the bud seedlings are improved, the survival rate reaches 96%, the detoxification rate reaches 100%, meanwhile, variation in the tissue culture process of ginger is prevented, the multiplication coefficient is remarkably improved and reaches 5.13, the rooting rate reaches 97.7%, and robust ginger rooted seedlings are cultured.

Detailed Description

The present invention is described in detail below by way of examples, it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations of the present invention based on the above-mentioned disclosure.

Example 1

A method for tissue culture and rapid propagation of ginger is characterized by comprising the following steps:

pretreatment: soaking rhizoma Zingiberis recens stem tip of 0.6cm in 70% ethanol for 30s, washing with sterile water, repeating the same soaking with ethanol once, washing with sterile water, and heat treating at 50 deg.C for 5 min;

inoculating and culturing

(1) Inoculating the pretreated ginger stem tip into a slow-release culture medium for primary culture, wherein the slow-release culture medium is prepared by supplementing 6-BA 0.5mg/L, NAA slow-release auxin 2mg/L, TDZ 0.3.3 mg/L, 2% sucrose and agar 0.55% in an MS basal culture medium, and adjusting the pH to 5.8;

wherein the NAA slow release auxin is nano SiO₂Dispersing in ethanol-removed aqueous solution, adding NAA, adding PVP k30, mixing, heating to 80 deg.C, keeping the temperature for 30min, stopping heating, cooling to room temperature, filtering, and drying to obtain SiO₂The mass ratio of NAA to PVP k30 is 6: 1: 0.03, the ethanol water solution is composed of ethanol and purified water with the volume ratio of 1:1, and the nano SiO₂And the mass-to-volume ratio of the ethanol aqueous solution is 1 g: 15 mL;

(2) culturing in dark room at 28 deg.C and 70% relative humidity until white and green callus and bud seedling grow, cutting off upper leaf and leaf sheath of bud seedling when the bud seedling grows to 4-5 cm, placing in culture medium, adding NH supplemented with 0.2% sucrose and 0.6% agar into the culture medium₄NO₃MS basal medium with half-reduced concentration, 0.5mg/L PP333 is supplemented, the volume ratio of the MS basal medium to the slow-release medium is 1:3, the same temperature and humidity are kept, the MS basal medium and the slow-release medium are continuously cultured for 24 hours under the illumination intensity of 1500Lux, and then cultured for 24 hours in an alternate culture mode under the non-illumination environment to obtain the propagated rooting seedlings;

example 2

A method for tissue culture and rapid propagation of ginger is characterized by comprising the following steps:

pretreatment: soaking rhizoma Zingiberis recens stem tip of 0.8cm in 70% ethanol for 40s, washing with sterile water, repeating the same soaking with ethanol once, washing with sterile water, and heat treating at 50 deg.C for 8 min;

inoculating and culturing

(1) Inoculating the pretreated ginger stem tip into a slow-release culture medium for primary culture, wherein the slow-release culture medium is prepared by supplementing 6-BA 1.5mg/L, NAA slow-release auxin 3mg/L, TDZ 0.25.25 mg/L, 2% sucrose and agar 0.65% in an MS basal culture medium, and adjusting the pH to 6;

wherein the NAA slow release auxin is nano SiO₂Dispersing in ethanol-removed aqueous solution, adding NAA, adding PVP k30, mixing, heating to 90 deg.C, keeping the temperature for 20min, stopping heating, cooling to room temperature, filtering, and drying to obtain SiO₂The mass ratio of NAA to PVP k30 is 4: 1: 0.08, the ethanol water solution is composed of ethanol and purified water with the volume ratio of 1:1, and the nano SiO₂And the mass-to-volume ratio of the ethanol aqueous solution is 1 g: 10 mL;

(2) culturing in dark room at 28 deg.C and relative humidity of 60% until white and green callus and bud seedling grow, cutting off upper leaf and leaf sheath of bud seedling when the bud seedling grows to 4-5 cm, placing in culture medium, adding NH supplemented with 0.2% sucrose and 0.6% agar into the culture medium₄NO₃MS basal medium with half-reduced concentration and 1mg/L PP333 are supplemented, the volume ratio of the MS basal medium to the slow-release medium is 1:3, the same temperature and humidity are kept, the MS basal medium and the slow-release medium are continuously cultured for 24 hours under the illumination intensity of 1800Lux, and then the MS basal medium and the slow-release medium are cultured in an alternate culture mode of 24 hours in a non-illumination environment to obtain the propagated rooting seedlings;

example 3

A method for tissue culture and rapid propagation of ginger is characterized by comprising the following steps:

pretreatment: soaking rhizoma Zingiberis recens stem tip of 0.7cm in 70% ethanol for 35s, washing with sterile water, repeating the same soaking with ethanol once, washing with sterile water, and heat treating at 50 deg.C for 6 min;

inoculating and culturing

(1) Inoculating the pretreated ginger stem tip into a slow-release culture medium for primary culture, wherein the slow-release culture medium is prepared by supplementing 6-BA 1mg/L, NAA slow-release auxin 2.5mg/L, TDZ 0.28mg/L, 2% sucrose and agar 0.6% in an MS basal culture medium and adjusting the pH to 5.8;

wherein the NAA slow release auxin is nano SiO₂Dispersing in ethanol-removed aqueous solution, adding NAA, adding PVP k30, mixing, heating to 85 deg.C, keeping the temperature for 25min, stopping heating, cooling to room temperature, filtering, and drying to obtain SiO₂And the mass ratio of NAA to PVP k30 is 5: 1: 0.05, the ethanol water solution is composed of ethanol and purified water with the volume ratio of 1:1, and the nano SiO₂And the mass-to-volume ratio of the ethanol aqueous solution is 1 g: 12 mL;

(2) culturing in dark room at 28 deg.C and relative humidity of 65% until white and green callus and bud seedling grow, cutting off upper leaf and leaf sheath of bud seedling when the bud seedling grows to 4-5 cm, placing in culture medium, adding NH supplemented with 0.2% sucrose and 0.6% agar into the culture medium₄NO₃MS basal medium with half-reduced concentration, 0.8mg/L PP333 is supplemented, the volume ratio of the MS basal medium to the slow-release medium is 1:3, the same temperature and humidity are kept, the MS basal medium and the slow-release medium are continuously cultured for 24 hours under the illumination intensity of 1600Lux, and then cultured for 24 hours in an alternate culture mode under the non-illumination environment to obtain the propagated rooting seedlings;

the basic composition of the MS medium of the present invention is shown in Table 1.

Table 1:

in the tissue culture process, the observation is carried out once every 3 days from the inoculation, and the pollution rate and the growth condition are regularly counted according to the growth condition of the stem tip:

the percent of contamination (number of contaminating explants/total number of explants) x 100;

proliferation factor ═ number of established effective seedlings/number of inoculated seedlings)

The proliferation rate (%) (number of proliferated cluster buds/number of inoculated total seedlings) × 100;

the rooting rate (%) (number of rooted seedlings/number of inoculated seedlings) x 100;

in the tissue culture process, the higher hormone level is favorable for detoxification of stem tips, but in the induction culture process of the higher hormone level, bud seedlings are easy to mutate, in the pretreatment process, ginger stem tips of 0.6-0.8 cm are divided into three groups, and the following pretreatment means are respectively adopted: (1) soaking with 70% ethanol 1 times, and adding 0.1% mercuric chloride (HgCl)₂) Soaking for 20min, washing with sterile water, treating at 38 deg.C for 5min, and inoculating to the slow release culture medium; (2) soaking with 70% ethanol for 1 time, washing with sterile water, treating at 38 deg.C for 5min, soaking in 40mg/L solution at 35 deg.C for 20min, and inoculating to the slow release culture medium; (3) the method adopts ethanol with volume concentration of 70% to soak for 30s, adopts sterile water to wash, then repeats ethanol soaking for 30s, then carries out high temperature treatment for 5min at 50 ℃, and then inoculates the ethanol in the slow-release culture medium to culture.

TABLE 2: induced survival rate and detoxication rate of ginger

It can be seen from the table that after the traditional ethanol soaking and mercury bichloride soaking treatment is adopted, the detoxification rate of the ginger stem tip is obviously improved after the treatment at a certain temperature, but the survival rate is obviously inhibited. The survival rate of the stem tip of the ginger is obviously improved by adopting high-temperature treatment after ethanol surface disinfection and combining with antibiotic treatment, but the detoxification rate is reduced to a certain extent.

SiO prepared by the invention₂Adding the coated NAA into an MS basal culture medium, wherein the adding concentration is 3mg/L, and the concentration change of the NAA in the culture medium is detected every 5 days as follows:

table 3: the concentration of the NAA slow release auxin in the culture medium changes along with time.

Initial concentration

Day 5

Day 10

Day 15

Day 20

Day 25

Concentration of NAA

0.073mg/L

0.196mg/L

0.276mg/L

0.349mg/L

0.454mg/L

0.455mg/L

In the process of tissue culture, the stem tip pretreated by the method of the invention is directly inoculated in the MS basal medium of the invention, 1.5 mg/L6-BA and 0.5mg/L NAA for culture, and the culture is used as a control group 1; the stem tip pretreated by the method of the invention is directly inoculated in the MS basal medium of the invention, 1 mg/L6-BA +0.5mg/L NAA +0.1mg/L TDZ for culture, and is used as a control group 2; the stem tip pretreated by the method of the invention is directly inoculated in the slow-release culture medium prepared by the invention for culture, and no substance is added in the middle to be used as a control group 3; the present invention was cultured in accordance with example 3, and the final culture results are shown in Table 4.

TABLE 4

Grouping	Number of explants inoculated	Coefficient of proliferation	Rooting rate	Number of abnormal plants	Incubation time
						Control group 1	20	1.14	58.9	2	For 38 days
Control group 2	20	2.88	86.4	4	25 days
						Control group 3	20	3.55	90.3	5	25 days
The invention	20	5.13	97.7	0	25 days

Through the comparison of the tissue culture, it can be seen that in the control group 1, as the concentration of the auxin NAA in the start culture medium is too high, the induction efficiency of the cluster buds is inhibited, so that the proliferation rate is lower, and the rooting rate is also lower; in the control group 2, 0.1mg/L TDZ (cytokinin-like) is added in the culture medium, but the concentration does not play a role in quickly starting induction, but only the proportion of the cytokinin to the auxin is increased, so that the effect of inducing the formation of the cluster buds is enhanced, in the control group 3, the slow-release culture medium prepared by the invention is adopted, so that the concentration of NAA is lower at the beginning, the induction formation of the cluster buds is facilitated, the concentration of NAA gradually rises along with the culture time in the culture process, the growth of the cluster buds to form radicles is promoted, but the overall concentration of a growth regulator is too high at the later stage, and the abnormal condition of the rooted seedlings is caused; in the invention, a specific slow-release culture medium is adopted, and 1/3 NH in the volume of the original slow-release culture medium is added after the induction of the cluster buds₄NO₃The MS basal medium with the concentration reduced by half regulates the concentration of each growth regulator in the culture medium, reduces the generation of abnormal rooted seedlings, and adds 1-1.5 mg/L PP333 to compete with an auxin generation receptor, thereby achieving the effect of strengthening the seedlings. In the invention, the ginger tissue culture process enables the induction culture, the proliferation culture and the rooting culture to be completed in the culture medium, thereby greatly simplifying the culture steps, shortening the culture time and enabling the cultured rooted seedlings to be strong.