CN115474487A - Indoor ralstonia solanacearum inoculation method - Google Patents

Indoor ralstonia solanacearum inoculation method Download PDF

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Publication number
CN115474487A
CN115474487A CN202211053065.3A CN202211053065A CN115474487A CN 115474487 A CN115474487 A CN 115474487A CN 202211053065 A CN202211053065 A CN 202211053065A CN 115474487 A CN115474487 A CN 115474487A
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inoculation
peanut
indoor
ralstonia solanacearum
ralstonia
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杨永
谭晓丹
陈婷
戴小秋
杨冬
吴雨霜
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Zhongkai University of Agriculture and Engineering
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Zhongkai University of Agriculture and Engineering
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G7/00Botany in general
    • A01G7/06Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00Cultivation of specific crops or plants not otherwise provided for
    • A01G22/40Fabaceae, e.g. beans or peas

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  • Life Sciences & Earth Sciences (AREA)
  • Botany (AREA)
  • Environmental Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)

Abstract

The invention belongs to the technical field of plant bacteria inoculation, and discloses an indoor peanut ralstonia solanacearum inoculation method, which comprises the steps of dipping ralstonia solanacearum bacterial liquid by using sterile scissors, shearing two small leaves of diagonal lines in 4 small leaves of inverted 2 leaves and inverted 3 leaves of a sample peanut, and enabling the two small leaves to be perpendicular to 2/3 positions of half medium-vein small leaves, thereby completing inoculation. The invention provides a simple and efficient peanut ralstonia solanacearum inoculation method, which can complete efficient inoculation by a small amount of inoculation materials, provide a theoretical basis for culture of peanut ralstonia solanacearum germplasm and analysis of a disease-resistant mechanism, and realize efficient prevention and control of peanut ralstonia solanacearum. The indoor peanut ralstonia solanacearum inoculation method provided by the invention can quickly improve the incidence of the sample peanut to the ralstonia solanacearum, has a good inoculation effect, and particularly can achieve 100% of the incidence of the sample peanut suffering from diseases. The efficient inoculation method provided by the invention can provide technical support for screening of the anti-susceptible peanut variety and provide an important theoretical basis for disease resistance mechanism analysis of bacterial wilt.

Description

Indoor ralstonia solanacearum inoculation method
Technical Field
The invention belongs to the technical field of plant bacterium inoculation, and particularly relates to an indoor ralstonia solanacearum inoculation method.
Background
At present, bacterial wilt is a soil-borne disease with strong destructiveness caused by ralstonia solanacearum, which occurs in the seedling stage and the adult stage of plant growth, the vascular bundles at the root and the stem base of the diseased plant begin to turn yellow brown, and the vascular bundle conduction tissues are destroyed, so that the plant loses water and withers.
Bacterial wilt is one of the most serious bacterial diseases which harm the quality and the yield of peanuts, and particularly, the disease incidence condition is serious in Yangtze river basin and southern areas of China, so that the method for culturing disease-resistant varieties is the most effective means for preventing and treating the bacterial wilt. The efficient inoculation of the peanut bacterial wilt is one of important foundations for accelerating the culture of the germplasm of the peanut bacterial wilt and researching disease resistance mechanisms, and is a key means for realizing efficient prevention and control of the peanut bacterial wilt.
The field disease nursery is the most traditional identification method for peanut bacterial wilt, and the method needs to be carried out outdoors, so that the method is easily influenced by the environment and has long identification period. Therefore, more and more researchers adopt indoor inoculation methods such as a root-damaging bacterium-filling method, an injection method, a needle punching method and the like to identify the peanut bacterial wilt. However, these methods have the disadvantages of complicated operation, difficulty in controlling the area of the artificial wound, and easy damage to the plant, resulting in poor inoculation effect.
Through the above analysis, the problems and defects of the prior art are as follows: the method has the defects of long identification period, complex operation, difficulty in controlling the area of an artificial wound, easiness in causing physical damage to plants and the like, and poor inoculation effect.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an indoor ralstonia solanacearum inoculation method.
The invention is realized in such a way, an indoor ralstonia solanacearum inoculation method comprises the following steps:
and (3) dipping the ralstonia solanacearum bacterial liquid by using sterile scissors to cut two diagonal leaflets in 4 leaflets of the inverted 2 and 3 leaves of the sample peanut, and enabling the two diagonal leaflets to be perpendicular to 2/3 of the midvein half leaflet, thereby completing inoculation.
Further, the indoor peanut ralstonia solanacearum inoculation method comprises the following steps:
step one, peanut seeding is carried out indoors to serve as an inoculation sample;
step two, collecting bacterium liquid with strong pathogenicity, and identifying and activating on a CPG culture medium containing TTC in a laboratory;
step three, dipping bacteria liquid with sterile scissors to cut off the lobules of the peanut sample, and completing inoculation; the ralstonia solanacearum is quickly inoculated on the peanuts by leaf cutting.
And step four, culturing indoors after inoculation, and controlling indoor temperature and humidity and long-day culture of the inoculated sample peanuts.
Further, the bacterial liquid in the second step is ralstonia solanacearum bacterial liquid.
And further, performing activation culture on the bacterial liquid in the second step in a CPG culture medium containing TTC and an incubator.
Further, the temperature of the incubator was 28 ℃.
Further, the growth cycle of the sample peanuts in the third step is about two weeks.
Further, in the third step, the period from 7 to 8 leaves is the optimal inoculation period.
Further, the concentration of the inoculated bacterial liquid in the third step reaches OD 600nm Inoculation was performed at 0.1.
Further, the indoor temperature in the fourth step is controlled at 28 +/-2 ℃ and the humidity is 70%.
Further, the indoor cultivation method in the fourth step is as follows: culturing under light for 16h, and culturing in dark for 8 h.
In combination with the technical solutions and the technical problems to be solved, please analyze the advantages and positive effects of the technical solutions to be protected in the present invention from the following aspects:
first, aiming at the technical problems existing in the prior art and the difficulty in solving the problems, the technical problems to be solved by the technical scheme of the present invention are closely combined with results, data and the like in the research and development process, and some creative technical effects are brought after the problems are solved. The specific description is as follows:
the invention provides a simple and efficient peanut ralstonia solanacearum inoculation method, which can complete efficient inoculation by a small amount of inoculation materials, provide theoretical basis for peanut ralstonia solanacearum germplasm culture and disease resistance mechanism research, and realize efficient prevention and control of peanut ralstonia solanacearum.
The invention adopts sterile scissors to dip ralstonia solanacearum bacterial liquid to cut two small leaves of a diagonal line in 4 small leaves of the inverted 2 leaves and the inverted 3 leaves of the sample peanut, and the two small leaves are vertical to 2/3 of the middle-vein half small leaves, thereby completing inoculation. The technology improves the inoculation speed and the inoculation efficiency of the peanut bacterial wilt, is favorable for quickly and efficiently identifying the resistance of the peanut to the bacterial wilt, and accelerates the screening of the peanut variety resisting the bacterial wilt and the analysis of the pathogenic mechanism of the bacterial wilt.
The invention provides a simple and efficient indoor inoculation method for inoculating ralstonia solanacearum to peanuts, which can quickly improve the incidence of the ralstonia solanacearum of the sample peanuts, and particularly can achieve 100% of the incidence of the sick sample peanuts. The efficient inoculation mode can provide technical support for screening of the anti-susceptible peanut varieties, and further provides theoretical basis for research of molecular mechanism of bacterial wilt resistance of peanuts, breeding of disease-resistant varieties and prevention and control of bacterial wilt.
Secondly, considering the technical scheme as a whole or from the perspective of products, the technical effect and advantages of the technical scheme to be protected by the invention are specifically described as follows:
the invention provides a scheme for inoculating ralstonia solanacearum to peanuts by leaf cutting, the scheme is simple and efficient, the inoculation effect is good, and the morbidity of inoculated susceptible varieties can reach 100%.
Third, as inventive supplementary proof of the claims of the present invention, there are several important aspects as follows:
(1) The parts where the bacterial wilt occurs are mainly aerial parts, and the disease state of the peanuts can be observed more intuitively and quickly by inoculating the bacterial wilt in a leaf cutting mode.
(2) The invention can quickly identify the resistance of a large batch of peanut materials under the condition of manual control, thereby greatly shortening the identification time and the identification cost.
(3) The method is simple and quick to operate, and is not easy to operate unlike the traditional inoculation mode.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of an indoor peanut ralstonia solanacearum inoculation method provided by the embodiment of the invention.
Fig. 2 (a), fig. 2 (b) are phenotypes of peanuts a281 and a165 after 10 days of leaf-cutting inoculation with HA4-1 strain, bar =4cm; FIG. 2 (c) is the disease index of the HA4-1 strain inoculated by peanut A281 and A165 leaf-cutting method, the abscissa is the number of days after inoculation, and the ordinate is the disease index; fig. 2 (d) is the survival rate of the HA4-1 strain inoculated by the peanut a281 and a165 leaf-cutting method, with the abscissa being the number of days after inoculation and the ordinate being the survival rate, × P < 0.0001.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Aiming at the problems in the prior art, the invention provides an indoor ralstonia solanacearum inoculation method, and the invention is described in detail below with reference to the accompanying drawings.
1. The embodiments are explained. This section is an illustrative example developed to explain the claims in order to enable those skilled in the art to fully understand how to implement the present invention.
As shown in fig. 1, the indoor peanut ralstonia solanacearum inoculation method provided by the embodiment of the invention comprises the following steps:
s101, sowing peanuts indoors to serve as inoculation samples;
s102, collecting bacterial liquid with strong pathogenicity, and identifying and activating the bacterial liquid on a TTC-containing CPG culture medium in a laboratory;
s103, dipping the bacterial solution by using sterile scissors to shear the lobules of the peanut sample, and completing inoculation;
and S104, culturing indoors after inoculation, and culturing the inoculated sample peanuts by controlling indoor temperature and humidity and long-day sunlight.
As a preferred embodiment, the indoor peanut ralstonia solanacearum inoculation method provided by the embodiment of the invention specifically comprises the following steps:
s1, peanut seeding is carried out indoors to serve as an inoculation sample;
s2, collecting bacterial liquid of ralstonia solanacearum with strong pathogenicity, identifying the bacterial liquid on a CPG culture medium containing TTC in a laboratory, marking and activating the bacterial liquid after successful identification, and culturing the bacterial liquid in an incubator at 28 ℃, wherein a single bacterium can be selected to fall into the CPG liquid culture medium after 2-3 days;
s3, selecting a single bacterial colony of the ralstonia solanacearum, adding the single bacterial colony into a CPG liquid culture medium, placing the mixture on a shaking table at 28 ℃ and 180rpm for culturing overnight, measuring the OD value of a bacterial liquid by using a spectrophotometer, and configuring the bacterial liquid to OD by using sterile water 600nm After an approximate value of 0.1, inoculation can be carried out. Dipping bacteria liquid with sterile scissors to cut two small leaves of a diagonal line in 4 small leaves of the inverted 2 and 3 small leaves of the sample peanut, and cutting the two small leaves to 2/3 of half small leaves in a direction perpendicular to the midpulse;
and S4, culturing indoors after inoculation, wherein the indoor temperature is controlled to be about 28 +/-2 ℃ and the indoor humidity is controlled to be about 70%, and the light culture is carried out for 16 hours and the dark culture is carried out for 8 hours.
The method for inoculating the ralstonia solanacearum to the indoor peanut ralstonia solanacearum inoculation method provided by the embodiment of the invention (the ralstonia solanacearum which is separated from various places is inoculated successfully, so that the method is universal to the ralstonia solanacearum), the morbidity of a peanut sample can be improved, the morbidity of a sick peanut sample can reach 100%, the indoor inoculation method is simple, easy and efficient, the resistance of the peanut variety to the ralstonia solanacearum can be rapidly identified, an important theoretical basis is improved for the germplasm culture and disease-resistant mechanism research of the peanut ralstonia solanacearum, and the culture process of the disease-resistant variety is accelerated.
2. Application examples. 303 parts of peanut variety is taken as a material, and ralstonia solanacearum strain HA4-1 and PeaFJ1 are respectively inoculated by a leaf cutting method for resistance identification. According to the first repeated identification result, 112 peanut varieties are selected from the peanut varieties to be subjected to three repeated identifications, wherein 1 part of high resistant variety, 5 parts of medium resistant variety, 44 parts of susceptible variety, 62 parts of susceptible variety, 3 parts of medium resistant variety, 26 parts of susceptible variety and 83 parts of susceptible variety are selected from the peanuts inoculated with HA 4-1. The inoculation and identification time of the ralstonia solanacearum is greatly shortened by a leaf-cutting method, the shortest identification time is only about ten days, and the longest identification time is about thirty days.
3. Evidence of the relevant effects of the examples. Inoculating strain HA4-1 to the disease-resistant variety A165 and the susceptible variety A281 by a leaf cutting method, and simultaneously inoculating clear water for comparison, and performing detailed disease observation for 20 days. The results show (figure 2) that the leaves inoculated with A281 started to develop disease 1 day after inoculation of the strain HA4-1, the disease index sharply increased 1 to 7 days after inoculation, and almost all plants died by 10 days after inoculation. The A165 inoculated leaf has a disease phenomenon only on the 3 rd day after inoculation, the disease index does not change greatly after 6 days after inoculation, the disease of the plant with the disease on the 10 th day after inoculation is in the first grade, and only part of the plant dies on the twenty th day after inoculation. Therefore, the leaf-cutting method can be used for resisting and sensing peanut varieties and can quickly identify the disease resistance of the peanut through phenotype.
Figure 2 (a, b) is the phenotype of peanuts a281 and a165 leaf-cut inoculated with HA4-1 strain for 10 days, bar =4cm; (c) Disease indexes of HA4-1 strains inoculated by peanut A281 and A165 leaf cutting methods are shown, the abscissa is the days after inoculation, and the ordinate is the disease indexes; (d) Survival of HA4-1 strains inoculated for peanut a281 and a165 leaf-cutting, days after inoculation on the abscissa, survival on the ordinate, P < 0.0001.
The above description is only for the purpose of illustrating the embodiments of the present invention, and the scope of the present invention should not be limited thereto, and any modifications, equivalents and improvements made by those skilled in the art within the technical scope of the present invention as disclosed in the present invention should be covered by the scope of the present invention.

Claims (10)

1. An indoor ralstonia solanacearum inoculation method is characterized by comprising the following steps:
and (3) dipping the ralstonia solanacearum bacterial liquid by using sterile scissors to cut two diagonal leaflets in 4 leaflets of the inverted 2 and 3 leaves of the sample peanut, and enabling the two diagonal leaflets to be perpendicular to 2/3 of the midvein half leaflet, thereby completing inoculation.
2. The indoor peanut ralstonia solanacearum inoculation method as claimed in claim 1, characterized in that the indoor peanut ralstonia solanacearum inoculation method comprises the following steps:
step one, peanut seeding is carried out indoors to serve as an inoculation sample;
step two, collecting bacterium liquid with strong pathogenicity, and identifying and activating on a CPG culture medium containing TTC in a laboratory;
dipping bacteria solution with sterile scissors to shear the small leaves of the peanut sample, and completing inoculation;
and step four, culturing indoors after inoculation, and culturing the inoculated sample peanuts by controlling indoor temperature and humidity and long-day sunlight.
3. The indoor ralstonia arachidicola inoculation method according to claim 2, wherein the bacterial liquid in the second step is ralstonia solanacearum bacterial liquid.
4. The indoor ralstonia arachidicola inoculation method according to claim 2, wherein the bacterial liquid in the second step is subjected to activation culture in a CPG medium containing TTC and an incubator.
5. The indoor ralstonia arachidicola inoculation method according to claim 4, wherein the temperature of the incubator is 28 ℃.
6. The indoor peanut ralstonia solanacearum inoculation method according to claim 2, wherein the growth cycle of the sample peanuts in the third step is about two weeks.
7. The indoor ralstonia arachidicola inoculation method according to claim 2, wherein in the third step, the optimal inoculation period is from 7 to 8 leaves.
8. The indoor ralstonia arachidicola inoculation method according to claim 2, wherein the concentration of the inoculated bacterial liquid in the third step reaches OD 600nm Inoculation is carried out at an angle of about 0.1.
9. The indoor method for inoculating ralstonia solanacearum as claimed in claim 2, wherein in the fourth step, the indoor temperature is controlled at 28 ± 2 ℃ and the humidity is 70%.
10. The indoor peanut ralstonia solanacearum inoculation method as claimed in claim 2, wherein the indoor culture method in the fourth step is: culturing under light for 16h, and culturing under dark for 8 h.
CN202211053065.3A 2022-08-30 2022-08-30 Indoor ralstonia solanacearum inoculation method Pending CN115474487A (en)

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