A salt-tolerant cultivation device for crape myrtle with an immersion dual-mode control system and a salt-tolerant identification method

Abstract

The present invention discloses a salt-tolerant cultivation device and salt-tolerant identification method for crape myrtle with an immersion dual-mode control system. The dual-mode control system is adopted. When the salt stress treatment mode is selected, the top pipe device can emit a spray according to the internal humidity to replenish water in time. When the basic cultivation mode is selected, the top pipe device exhausts air through an air filter element, ensuring air circulation inside the container and reducing the pollution rate. Crape myrtle seeds and seedlings germinate and grow in a semi-open container, which not only solves the problems of seed water shortage or soaking rot, culture solution contamination, and seedling growth difficulties at the source, but also achieves precise salt stress treatment, avoids salt fluctuations caused by water increase or decrease, and affects the salt control effect. At the same time, it reduces the waste of resources and plant damage caused by frequent changes of nutrient solution, and solves the problems of traditional forest seedling cultivation devices with single functions, inaccurate salt concentration control, and low scale.

Description

Technical Field

[0001] The present invention relates to the technical field of seedling and flower planting, and in particular to a salt-tolerance cultivation device of a crape myrtle immersion dual-mode control system and a salt-tolerance identification method. Background Art

[0002] Traditional salt-tolerant culture devices for crape myrtle seeds include conventional germination boxes, plug trays, culture dishes, etc., which have single functions, are cumbersome to replace the salt solution or cannot achieve salt-controlled culture, and have poor ventilation. On the other hand, after the crape myrtle seeds germinate, the seeds are often submerged in the nutrient solution or lack water due to untimely rehydration, which affects the growth of the seedlings. In addition, the existing culture devices are not suitable for crape myrtle seed culture. The limited height of the lower space of the culture box will restrict the growth of the crape myrtle root system, and there is no fixing device, which can easily cause the seedlings to bend or fall over, and then cause the culture solution to be contaminated due to plant rot. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a salt-tolerant cultivation device of a crape myrtle submerged dual-mode control system and a salt-tolerant identification method, so as to solve the problems mentioned in the above background technology.

[0004] To achieve the above-mentioned object, on the one hand, the present invention provides a salt-tolerant culture device of a crape myrtle immersion dual-mode control system, comprising a culture unit, a host and a liquid storage tank, wherein the culture unit comprises a plurality of transparent culture tanks and a bracket for supporting the culture tanks;

[0005] The surface of the bracket is provided with an internal thread of the bracket for threaded connection with the culture tank body, the culture tank body includes an upper tank body and a lower tank body, and the lower part of the upper tank body and the upper part of the lower tank body are both provided with an external thread that matches the internal thread of the bracket;

[0006] An air outlet is provided on the upper portion of the lower tank body, a buoyancy ball is provided in the lower tank body, a partition movable in a vertical direction is provided inside the lower tank body above the buoyancy ball, a handle movable groove is provided on the lower tank body in a vertical direction, the handle movable groove is used to accommodate a partition adjustment handle, and one end of the partition adjustment handle passes through the handle movable groove and is detachably connected to the partition inside the lower tank body;

[0007] A branch pipe is provided on the top of the upper tank body, and the branch pipe is fixedly connected to a main pipe through a central exchange pipe, and the main pipe is connected to the main engine;

[0008] A control system and a compressor are provided inside the main unit, the air inlet of the compressor is connected to the outside air, and the air outlet is connected to the main pipe; the right side of the main unit is connected to the liquid storage tank through a water inlet pipe, and the water inlet pipe is connected to the main pipe. A water pump is provided in the liquid storage tank, one end of the water inlet of the water pump is connected to the liquid inside the liquid storage tank, and one end of the water outlet is connected to the water inlet pipe; the main unit is also provided with a time adjustment button, a display screen and a mode adjustment switch, and the compressor, water pump, time adjustment button, display screen and mode adjustment switch are all connected to the control system.

[0009] Specifically, an air filter element is provided in the branch pipe.

[0010] Specifically, it also includes a water tank, which is connected to the water inlet pipe through a water pump. A humidity sensing device is also provided inside the culture tank body, and the humidity sensing device is connected to the control system. A spray head is provided at one end of the branch pipe located inside the culture tank body.

[0011] On the other hand, a method for culturing and identifying salt tolerance of Lagerstroemia indica is provided, comprising the following steps:

[0012] 1. Salt tolerance cultivation of crape myrtle seeds during germination period:

[0013] S1) Clean and disinfect the crape myrtle seeds before use;

[0014] S2) adding salt solutions of varying concentrations to the culture medium in the culture tank according to the salt gradient setting; placing the sterilized crape myrtle seeds in the baffle of the culture tank with the radicle facing downward, and adjusting the baffle position using the baffle adjustment handle to ensure full contact with the culture medium surface;

[0015] S3) Select "Salt Treatment Culture" mode to start culture;

[0016] 2. Identification of salt tolerance of crape myrtle seeds during germination period:

[0017] S4) Visually grade the salt damage symptoms, record the results, calculate the salt damage index, and then grade the salt tolerance of the seedlings;

[0018] 3. Salt tolerance cultivation of crape myrtle seedlings during growth period:

[0019] S5) Filling the culture medium in the culture tank with salt solutions of varying concentrations according to the salt gradient setting; after the germination period, replacing baffles of varying pore sizes and inserting the crape myrtle seedlings, allowing the roots to penetrate the baffle holes and spread downward. Adjusting the baffle position using the baffle adjustment handle ensures that the roots of the crape myrtle seedlings are submerged in the culture medium;

[0020] S6) Select "normal culture" mode to start culture;

[0021] 4. Identification of salt tolerance of crape myrtle seedlings during growth period:

[0022] S7) Classify the salt tolerance of crape myrtle seedlings based on plant height, stem diameter, and root length;

[0023] V. Comprehensive Assessment

[0024] S8) Combine germination stage identification with seedling growth stage identification to evaluate the salt tolerance of crape myrtle resources.

[0025] Specifically, when cultivating seeds during the germination period, the disinfection conditions include washing with alcohol for 30 seconds, rinsing with clean water 3-4 times, disinfecting with 2% sodium hypochlorite solution for 5 minutes, rinsing with clean water 5-6 times, and then absorbing the moisture on the surface of the seeds with sterile filter paper.

[0026] Specifically, during the seed germination period, the growth conditions of the "salt treatment culture" mode include: light intensity of 7500lx, a light cycle of 12 hours of light and 12 hours of darkness, a temperature of 25°C, a humidity of 78%, and ventilation once every 8 hours for 1 minute each time.

[0027] Specifically, during the seed germination period, the salt treatment concentrations were 1‰, 2‰, 3‰, and 4‰; and the salt treatment time was 2 weeks.

[0028] Specifically, during the seed germination period, the host is controlled to replenish the salt solution in a timely manner according to the position of the buoyancy ball at the bottom of the tank.

[0029] Specifically, during the seedling growth period, the growth conditions of the "normal culture" mode include: light intensity of 7500lx, a light cycle of 12 hours of light and 12 hours of darkness, a temperature of 25°C, a humidity of 78%, and ventilation once every 4 hours for 2 minutes each time.

[0030] Specifically, during the seedling growth period, the salt treatment concentrations were 1‰, 2‰, 3‰, and 4‰; the salt treatment time was 3 weeks; and the nutrient solution was replaced every other week.

[0031] Specifically, the culture medium is 1 / 2 Hoagland solution.

[0032] Specifically, during the seed germination period, the partition aperture is 1mm, with one hole for each seed, and all seeds are placed in sequence; during the seedling growth period, the partition aperture is 4mm, and the crape myrtle seedlings are adjusted to an upright state. The spacing between each seedling is adjusted according to the growth conditions to ensure that each seedling has sufficient growth space.

[0033] Specifically, the salt tolerance cultivation and salt tolerance identification of Lagerstroemia indica were carried out in an artificial climate chamber.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1) During the germination period of crape myrtle seeds, the liquid can be automatically replenished through the liquid replenishing tank, which not only reduces the risk of pollution caused by frequent replacement of nutrient solution, but also provides ideas for factory-based seedling cultivation.

[0036] 2) The position of the partition can be adjusted in time through the external handle to ensure that the seeds are kept moist, avoiding the problem of seed germination rate being affected by water shortage.

[0037] 3) A ventilation duct is set up, and the air flows in the tank after passing through the air filter, which solves the problem of poor ventilation effect of traditional germination boxes, provides a good semi-open environment for plant growth, and helps with seedling hardening in the later stage.

[0038] 4) Partitions with different apertures can adapt to the period from seed germination to seedling growth of crape myrtle. They can be replaced according to the growth of seedlings to fix the plants and prevent them from growing "fighting". At the same time, it is convenient for scientific researchers to count and observe the growth situation.

[0039] 5) Each tank is a unit, and the number of units can be increased through pipelines, which can realize laboratory factory seedling cultivation, effectively improve seedling cultivation efficiency and reduce labor input.

[0040] 6) By establishing a method for jointly assessing salt tolerance during both the seed germination and seedling growth stages of crape myrtle resources, this method enables accurate assessment of salt tolerance in crape myrtle varieties and allows for salt tolerance grading of different crape myrtle resources. This method can be used to provide breeding material for salt-tolerant crape myrtle breeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic structural diagram of a salt-tolerant culture device for a crape myrtle immersion dual-mode control system according to the present invention;

[0042] Figure 2 It is an exploded view of the culture tank body of the present invention;

[0043] Figure 3 It is a structural schematic diagram of the tank support device in the present invention;

[0044] List of Figure Symbols:

[0045] 1. Central exchange tube; 2. Main pipe; 3. Main unit; 4. Time adjustment button; 5. Liquid filling port; 6. Liquid storage tank; 7. Water inlet pipe; 8. Mode adjustment switch; 9. Display screen; 10. Lower tank body; 11. Bracket; 12. Upper tank body; 13. Air filter element; 14. Branch pipe; 15. Internal and external double threads; 16. Partition adjustment handle; 17. Partition; 18. Buoyancy ball; 19. Air outlet; 20. Handle moving slot; 21. Internal thread of bracket. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0047] Example 1: See Figures 1-3 A salt-tolerant culture device with a crape myrtle immersion dual-mode control system includes a culture unit, a host 3 and a liquid storage tank 6. The culture unit includes a plurality of transparent culture tanks and a bracket 11 for supporting the culture tanks.

[0048] The surface of the bracket 11 is provided with multiple bracket internal threads 21 for threaded connection with the culture tank body. Each culture tank body includes an upper tank body 12 and a lower tank body 10. The lower part of the upper tank body 12 and the upper part of the lower tank body 10 are provided with external threads 15 that cooperate with the bracket internal threads 21. The upper tank body 12 and the lower tank body 10 are threadedly connected to the bracket internal threads 21 through the external threads 15.

[0049] A branch pipe 14 is provided on the top of the upper tank body 12 , an air filter element 13 is provided in the branch pipe 14 , and the branch pipe 14 is fixedly connected to the main pipe 2 through the central exchange pipe 1 , and the main pipe 2 is connected to the main unit 3 .

[0050] The main unit 3 is internally provided with a control system and a compressor electrically connected to the control system. The compressor is used to deliver air to the interior of the tank. The compressor air inlet is connected to the outside air, and the air outlet is connected to the main pipe 2. The upper portion of the lower tank 10 is provided with an air outlet 19.

[0051] The right side of the main unit 3 is connected to the liquid storage tank 6 via a water inlet pipe 7, which is in communication with the main pipe 2. The liquid storage tank 6 houses a culture fluid tank containing culture fluid and salt solution tanks of varying concentrations. Both the culture fluid tank and the salt solution tank are equipped with water pumps, which transport the liquid from the tanks to the culture tanks. The water pumps are electrically connected to the control system. The water inlet of each water pump is connected to the liquid in the culture fluid tank and the salt solution tank, respectively, and the water outlet is connected to the water inlet pipe 7.

[0052] The host 3 is also provided with a time adjustment button 4 connected to the control system, a display screen 9 and a mode adjustment switch 8.

[0053] The lower tank 10 is equipped with a buoyancy ball 18. By observing the position of the buoyancy ball 18, nutrient solution or saline solution can be replenished in a timely manner. A vertically movable partition 17 is provided within the lower tank 10 above the buoyancy ball 18. A vertically movable handle slot 20 is provided in the lower tank 10. The handle slot 20 is used to accommodate the partition adjustment handle 16. One end of the partition adjustment handle 16 passes through the handle slot 20 and is detachably connected to the partition 17 within the lower tank 10.

[0054] When in use, the control system starts the water pump in the culture fluid tank to fill or replenish the culture fluid in each culture tank. According to the position of the buoyancy ball in the culture tank, the control system in the host can timely start the water pump in the salt solution tank to replenish the salt solution.

[0055] The device also includes a water tank, which is connected to the water inlet pipe 7 through a water pump. A humidity sensor is also provided inside the culture tank, which is connected to the control system. A branch pipe 14 is located inside the culture tank and has a spray head at one end.

[0056] The dual-mode control system is suitable for two different cultivation settings. When the salt stress treatment mode is selected, the top sprinkler head can emit spray according to the humidity conditions inside the culture tank to replenish water in time; when the basic culture mode is selected, the top branch pipe 14 is exhausted through the air filter element to ensure air circulation inside the container and reduce the contamination rate.

[0057] On the other hand, crape myrtle seeds and seedlings germinate and grow in semi-open containers, which not only solves the problems of seed lack of water or soaking rot, culture medium contamination, and seedling growth difficulties from the source, but also can achieve precise salt stress treatment, avoiding salt fluctuations due to increase or decrease in water, affecting the salt control effect, and at the same time reducing resource waste and plant damage caused by frequent replacement of nutrient solution.

[0058] The culture device is extendable, with each device serving as a unit. The number of units can be increased based on experimental needs, enabling "factory-like" scale cultivation in the laboratory. This solves the problems of traditional tree seedling culture devices, such as limited functionality, inaccurate salt concentration control, and low scalability.

[0059] A method for culturing and identifying salt tolerance of crape myrtle, comprising a method for culturing and identifying salt tolerance during the seed germination period and a method for culturing and identifying salt tolerance during the seedling growth period. The seed germination salt tolerance culture and identification are used to identify the tolerance of crape myrtle resources to salt damage when they grow to the two-leaf and one-heart stage. The growth period salt tolerance culture and identification are used for culturing crape myrtle seedlings. The seed germination is combined with the growth and management of the seedlings to screen salt-tolerant germplasm resources of crape myrtle.

[0060] The specific steps include:

[0061] (1) Cultivation and identification of salt tolerance of Crape Myrtle seeds during germination: carried out in an artificial climate chamber

[0062] The salt tolerance cultivation method of crape myrtle seeds during the germination period includes: seed disinfection, salt culture conditions during the germination period, growth conditions during the germination period, seedling raising method during the germination period, and salt tolerance grading method during the germination period.

[0063] 1. Disinfection of Crape Myrtle Seeds

[0064] Disinfection conditions include: washing with alcohol for 30 seconds, rinsing with clean water 3-4 times, disinfecting with 2% sodium hypochlorite solution for 5 minutes, rinsing with clean water 5-6 times, and then using sterile filter paper to absorb the moisture on the surface of the seeds and set aside.

[0065] 2. Salt culture conditions during the germination period

[0066] The system consists of multiple culture tanks, each containing a 1 / 2 Hoagland solution. Different concentrations of salt solution are added to the tanks based on the salinity setting. Each tank has a salt gradient with concentrations of 1‰, 2‰, 3‰, and 4‰, and the salt treatment period is two weeks. The host computer can also be controlled to replenish the salt solution in real time based on the position of the buoyant ball in the tank.

[0067] 3. Seedling cultivation method during germination period

[0068] Place the sterilized crape myrtle seeds in a 1mm-diameter partition of a culture tank, with the radicle facing downward, one hole for each seed, and place all the seeds in sequence; adjust the partition position using the partition adjustment handle to ensure full contact with the culture solution surface.

[0069] 4. Growth conditions during the germination period

[0070] After the position of the partition is adjusted, turn on the display switch and select the "Salt Treatment Cultivation" mode to start cultivation.

[0071] The culture conditions were as follows: light intensity of 7500 lx, a photoperiod of 12 hours of light and 12 hours of darkness, a temperature of 25°C, a humidity of 78%, and ventilation for 1 minute every 8 hours.

[0072] 5. Salt tolerance classification method during germination period

[0073] Identification of salt tolerance of crape myrtle seeds during germination: visually grade according to salt damage symptoms, record the results, calculate the salt damage index, and then grade the salt tolerance during the seedling stage.

[0074] (2) Cultivation and identification of salt tolerance of crape myrtle seedlings during growth period: carried out in an artificial climate chamber

[0075] The salt tolerance cultivation method of crape myrtle seedlings during the growth period includes salt cultivation conditions during the growth period, seedling raising methods during the growth period, growth conditions during the growth period, and salt tolerance grading methods during the growth period.

[0076] 6. Salt culture conditions during seedling growth period

[0077] According to the salt gradient setting, the culture medium in the culture tank is filled with salt solutions of different concentrations. The culture medium is 1 / 2 Hoagland solution, and the salt solution concentrations are 1‰, 2‰, 3‰, and 4‰. The salt treatment time is 3 weeks. At the same time, the nutrient solution is replaced every week, and the host can be controlled to replenish the salt solution in time according to the position of the buoyancy ball in the culture tank.

[0078] 7. Seedling cultivation methods during the seedling growth period

[0079] After the germination period, replace the 4mm-diameter baffles and move the crape myrtle seedlings in. Allow the roots to spread downward through the baffle holes. Adjust the seedlings to an upright position and adjust the spacing between each seedling according to their growth to ensure they have ample room to grow. Also, adjust the baffles using the baffle adjustment handles to ensure the roots of the crape myrtle seedlings are submerged in the culture medium.

[0080] 8. Growth conditions during the seedling growth period

[0081] After the position of the partition is adjusted, turn on the display switch and select the "normal culture" mode to start the culture. The growth conditions include: light intensity of 7500lx, photoperiod of 12 hours of light and 12 hours of darkness, temperature of 25℃, humidity of 78%, and ventilation every 4 hours for 2 minutes each time.

[0082] 9. Salt tolerance grading method during seedling growth period

[0083] Identification of salt tolerance of crape myrtle seedlings during the growth period: The salt tolerance of crape myrtle seedlings was graded based on the comparison of plant height, stem diameter and root length.

[0084] (3) Comprehensive assessment

[0085] 10. Combine germination period identification with seedling growth period identification to evaluate the salt tolerance of crape myrtle resources.

[0086] The dual-mode system of the present invention can meet the two stages of crape myrtle seed germination and seedling growth; it ensures that the crape myrtle seeds remain moist during germination and will not fail to germinate due to lack of water, thus realizing factory breeding and avoiding pollution problems caused by frequent rehydration; the adjustable partition can ensure that the seedling roots are immersed in the culture solution, avoiding the root curling and entanglement, lack of water, etc., which affect the growth of the seedlings; the visual tank device facilitates timely observation of the internal growth conditions.

[0087] It should be noted that the above content merely illustrates the technical idea of ​​the present invention and cannot be used to limit the scope of protection of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications all fall within the scope of protection of the claims of the present invention.

Claims

1. A method for cultivating salt tolerance and identifying salt tolerance of Lagerstroemia indica, using a Lagerstroemia indica immersion dual-mode control system salt tolerance cultivation device, comprising a cultivation unit, a host (3) and a liquid storage tank (6), wherein the cultivation unit comprises a plurality of transparent cultivation tanks and a bracket (11) for supporting the cultivation tanks; The surface of the bracket (11) is provided with a bracket internal thread (21) for threaded connection with a culture tank body, the culture tank body comprises an upper tank body (12) and a lower tank body (10), and the lower part of the upper tank body (12) and the upper part of the lower tank body (10) are both provided with an external thread (15) that cooperates with the bracket internal thread (21); An air outlet (19) is provided on the upper portion of the lower tank body (10), a buoyancy ball (18) is provided in the lower tank body (10), a partition (17) movable in a vertical direction is provided above the buoyancy ball (18) inside the lower tank body (10), a handle movable groove (20) is provided on the lower tank body (10) along the vertical direction, the handle movable groove (20) is used to accommodate the partition adjustment handle (16), and one end of the partition adjustment handle (16) passes through the handle movable groove (20) and is detachably connected to the partition (17) inside the lower tank body (10); A branch pipe (14) is provided on the top of the upper tank body (12), and the branch pipe (14) is fixedly connected to a main pipe (2) through a central exchange pipe (1), and the main pipe (2) is connected to the main engine (3); The host (3) is provided with a control system and a compressor, the air inlet of the compressor is connected to the outside air, and the air outlet is connected to the main pipe (2); the right side of the host (3) is connected to the liquid storage tank (6) through the water inlet pipe (7), the water inlet pipe (7) is connected to the main pipe (2), and a water pump is provided in the liquid storage tank (6), one end of the water inlet of the water pump is connected to the liquid inside the liquid storage tank (6), and one end of the water outlet is connected to the water inlet pipe (7); the host (3) is also provided with a time adjustment button (4), a display screen (9) and a mode adjustment switch (8), and the compressor, water pump, time adjustment button (4), display screen (9) and mode adjustment switch (8) are all connected to the control system, characterized in that: The following steps are involved:

1. Salt tolerance cultivation of crape myrtle seeds during germination period: S1) Clean and disinfect the crape myrtle seeds before use; S2) Salt culture conditions and seedling raising methods during the germination period According to the salt gradient setting, salt solutions of different concentrations are added to the culture solution in the culture tank; the sterilized crape myrtle seeds are placed in the partition of the culture tank with the radicle facing downward, and the partition position is adjusted by the partition adjustment handle to fully contact the culture solution surface; S3) Germination growth conditions: Select "Salt treatment culture" mode to start the culture; 2. Identification of salt tolerance of crape myrtle seeds during germination period: S4) Visually grade the salt damage symptoms, record the results, calculate the salt damage index, and then grade the salt tolerance of the seedlings; 3. Salt tolerance cultivation of crape myrtle seedlings during growth period: S5) Salt culture conditions during the seedling growth period and seedling cultivation methods during the germination period According to the salt gradient setting, salt solutions of different concentrations are added to the culture solution in the culture tank. After the germination period, salt tolerance culture is completed, the baffles of different pore sizes are replaced and the crape myrtle seedlings are moved in. The roots are arranged downward through the baffle holes. The baffle position is adjusted using the baffle adjustment handle to ensure that the roots of the crape myrtle seedlings are immersed in the culture solution. S6) Seedling growth conditions: Select "Normal culture" mode to start cultivation; 4. Identification of salt tolerance of crape myrtle seedlings during growth period: S7) Classify the salt tolerance of crape myrtle seedlings based on plant height, stem diameter, and root length; V. Comprehensive Assessment S8) Combine germination stage identification with seedling growth stage identification to evaluate the salt tolerance of crape myrtle resources.

2. The method for cultivating salt tolerance and identifying salt tolerance of Lagerstroemia indica according to claim 1, wherein: An air filter element (13) is provided in the branch pipe (14).

3. The method for culturing and identifying salt tolerance of Lagerstroemia indica according to claim 1, wherein: The device also includes a water storage tank, which is connected to a water inlet pipe (7) via a water pump. A humidity sensing device is also provided inside the culture tank body, which is connected to a control system. A spray head is provided at one end of the branch pipe (14) located inside the culture tank body.

4. The method for culturing and identifying salt tolerance of Lagerstroemia indica according to claim 1, wherein: During the germination stage, the disinfection conditions include washing with alcohol for 30 seconds, rinsing with water 3-4 times, disinfecting with 2% sodium hypochlorite solution for 5 minutes, rinsing with water 5-6 times, and then absorbing the moisture on the surface of the seeds with sterile filter paper. During the seed germination stage, the growth conditions of the "salt treatment culture" mode include: light intensity of 7500lx, a light cycle of 12 hours of light and 12 hours of darkness, a temperature of 25°C, a humidity of 78%, ventilation once every 8 hours for 1 minute each time; salt treatment concentrations of 1‰, 2‰, 3‰, and 4‰; and salt treatment time of 2 weeks.

5. The method for cultivating salt tolerance and identifying salt tolerance of Lagerstroemia indica according to claim 1, wherein: During the seed germination period, the host is controlled to replenish the salt solution in time according to the position of the buoyancy ball at the bottom of the tank.

6. The method for culturing and identifying salt tolerance of Lagerstroemia indica according to claim 1, wherein: During the seedling growth period, the growth conditions of the "normal culture" mode include: light intensity of 7500lx, a photoperiod of 12 hours of light and 12 hours of darkness, a temperature of 25°C, a humidity of 78%, ventilation once every 4 hours for 2 minutes each time; salt treatment concentrations of 1‰, 2‰, 3‰, and 4‰; salt treatment time of 3 weeks; and nutrient solution replacement every other week.

7. The method for culturing and identifying salt tolerance of Lagerstroemia indica according to claim 1, wherein: The culture solution is 1 / 2 Hoagland solution.

8. The method for cultivating salt tolerance and identifying salt tolerance of Lagerstroemia indica according to claim 1, wherein: During the seed germination period, the partition aperture is 1mm, and each seed has one hole, and all seeds are placed in sequence; during the seedling growth period, the partition aperture is 4mm, and the crape myrtle seedlings are adjusted to an upright state. The spacing between each seedling is adjusted according to the growth situation to ensure that each seedling has sufficient growth space.

9. The method for culturing and identifying salt tolerance of Lagerstroemia indica according to claim 1, wherein: The salt tolerance culture and salt tolerance identification of Lagerstroemia indica were both carried out in an artificial climate chamber.

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