Application of an organic trisulfide compound in promoting plant growth and a plant growth promoter

Abstract

This application relates to the technical field related to promoting plant growth, and specifically provides an application of an organic trisulfide compound in promoting plant growth and a plant growth promoter. Among them, the organic trisulfide compound is selected from the structure shown in formula (I), or its tautomer, or its stereoisomer, or its pharmaceutically acceptable salt. This application applies the organic trisulfide compound to plant growth, which not only promotes seed germination, young shoot growth, root growth, and seedling development, but also can increase crop yields.

Description

Technical Field

[0001] The present application relates to the technical field related to promoting plant growth, and specifically relates to the application of an organic trisulfide compound in promoting plant growth and a plant growth promoter. Background Art

[0002] People have long relied on chemical fertilizers to promote plant growth and increase crop yields, which has also brought some problems. For example, (1) it causes an increase in the nitrogen and phosphorus content in water, leading to eutrophication of rivers, lakes, and inland seas, resulting in excessive algae growth, water quality deterioration, and a large number of deaths of fish and other aquatic organisms; (2) long-term excessive and single application of chemical fertilizers will acidify the soil; the ammonium ion content in the organic and inorganic complexes in the soil solution and soil micelles increases, the soil structure is damaged, the soil becomes compacted, and it directly affects the agricultural production cost and crop yields; (3) it increases the toxic components in food, feed, and drinking water, and the nitrogen compound content in well water and river water in areas using chemical fertilizers increases, even exceeding the drinking water standard; (4) the soil microbial flora is damaged.

[0003] Excessive application of chemical fertilizers, especially nitrogen fertilizers, has a killing and inhibitory effect on microorganisms. After long-term application, a large number of microorganisms die, the soil microbial flora changes, and many beneficial microorganisms change from the dominant population to the secondary population, and crops are prone to various diseases. Moreover, the roots of crops, as an important absorption, synthesis, fixation, and support organ, play an important role in the growth and development of crops. Robust roots can provide sufficient nutrients and water for plant growth and are the basis for high crop yields. Summary of the Invention

[0004] In view of this, the present application provides the application of an organic trisulfide compound in promoting plant growth and a plant growth promoter. The present application applies the organic trisulfide compound to plant growth, which not only promotes seed germination, seedling growth, root growth, and seedling development, but also can increase crop yields.

[0005] In a first aspect, the present application provides the application of an organic trisulfide compound in promoting plant growth; wherein, the organic trisulfide compound is selected from the structure shown in formula (I), or its tautomer, or its stereoisomer, or its pharmaceutically acceptable salt:

[0006] ;

[0007] wherein, m1 and m2 each independently selected from 0 or 1, and m1 and m2 are equal or not equal;

[0008] n1 and n2 each independently selected from 0 or 1, and n1 and n2 are equal or not equal;

[0009] X1 and X2 are each independently selected from S or O, and X1 and X2 are the same or different;

[0010] R1 and R2 are each independently selected from unsubstituted or substituted C 1-6 alkyl, unsubstituted or substituted C 2-6 alkenyl, unsubstituted or substituted C 5-10 aryl (such as monocyclic aryl, etc., preferably phenyl) or unsubstituted or substituted C 3-10 heteroaryl (such as monocyclic heteroaryl or fused heteroaryl, etc., preferably C 3-5 monocyclic heteroaryl); wherein one, two, three or more hydrogen atoms in R1 and / or R2 are optionally replaced by halogen, -CN, -OH, -SH, -NH2, -C 1-3 alkyl, -O-C 1-3 alkyl, -O-C 1-3 alkenyl, -O-C 1-3 alkynyl, -S-C 1-3 alkyl, -S-C 1-3 alkenyl or -S-C 1-3 alkynyl; and R1 and R2 are the same or different.

[0011] In some alternative embodiments, m1 and m2 are not equal (for example, m1 is selected from 0 and m2 is selected from 1, or m1 is selected from 1 and m2 is selected from 0). In some specific embodiments, m1 and m2 are equal (for example, both m1 and m2 are selected from 0, or both m1 and m2 are selected from 1). In some specific embodiments, both m1 and m2 are selected from 0. In some specific embodiments, both m1 and m2 are selected from 1.

[0012] In some alternative embodiments, R1 and R2 are each independently selected from unsubstituted or substituted C 2-6 alkenyl, unsubstituted or substituted phenyl ( ), unsubstituted or substituted pyridyl ( ), unsubstituted or substituted thienyl ( ), unsubstituted or substituted thiazolyl ( ), unsubstituted or substituted furyl ( ), or unsubstituted or substituted quinolinyl ( ); wherein one, two, three or more hydrogen atoms in R1 and / or R2 are optionally replaced by halogen, -CN or -C 1-3 alkyl.

[0013] In some other alternative embodiments, R1 and R2 are each independently selected from unsubstituted or substituted C 2-6an alkenyl group, an unsubstituted or substituted phenyl group, an unsubstituted or substituted pyridyl group, an unsubstituted or substituted thiazolyl group, or an unsubstituted or substituted quinolinyl group; wherein one, two, three or more hydrogen atoms in R1 and / or R2 are optionally replaced by a halogen, -CN or -C 1-3 alkyl group.

[0014] In some alternative embodiments, R1 and R2 are each independently selected from an unsubstituted or substituted C 2-6 alkenyl group, an unsubstituted or substituted phenyl group, an unsubstituted or substituted pyridyl group, or an unsubstituted or substituted thiazolyl group; wherein one, two, three or more hydrogen atoms in R1 and / or R2 are optionally replaced by a halogen, -CN or -C 1-3 alkyl group.

[0015] In some alternative embodiments, R1 and R2 are each independently selected from , , , , , , , , , , , , , , , , , , , , .

[0016] In some alternative embodiments, R1 and R2 are each independently selected from , , , , , , , , , .

[0017] In some alternative embodiments, 1 and R2 are each independently selected from , , , , , , , , .

[0018] In some specific embodiments, when m1 and m2 are both selected from 1, R1 and R2 are the same.

[0019] In some optional embodiments, n1 and n2 are not equal (e.g., n1 is selected from 0 and n2 is selected from 1, or n1 is selected from 1 and n2 is selected from 0). In some embodiments, n1 and n2 are equal (e.g., n1 and n2 are both selected from 0, or n1 and n2 are both selected from 1). In some embodiments, n1 and n2 are both selected from 0. In some embodiments, n1 and n2 are both selected from 1.

[0020] In some alternative embodiments, X1 and X2 are the same. In some specific embodiments, X1 and X2 are both selected from S. In some specific embodiments, X1 and X2 are both selected from O.

[0021] In some optional embodiments, the organic trisulfide compound is selected from (dimethyl trisulfide, CAS No. 3658-80-8), (Diallyl trisulfide, CAS No. 2050-87-5), (dibenzyl trisulfide, CAS No. 6493-73-8), (CAS number is 22948-20-5), (CAS number is 869811-23-4), (CAS No. 27639-73-2), , , , , , , , , , , , , and At least one of .

[0022] In some optional embodiments, the application is selected from any of the following:

[0023] (I), promoting plant seed germination; and / or,

[0024] (II), promoting the growth of plant shoots; and / or,

[0025] (III), promoting plant root growth; and / or,

[0026] (IV) Promote the development of plant seedlings.

[0027] In a second aspect, the present application provides a use of an organic trisulfide compound in the preparation of a plant growth promoter, wherein the organic trisulfide compound is as defined in the first aspect.

[0028] In a third aspect, the present application provides a plant growth promoter, which comprises an organic trisulfide compound; wherein the organic trisulfide compound is as defined in the first aspect.

[0029] In some alternative embodiments, based on the plant growth promoter, the plant growth promoter comprises an organic trisulfide compound (0.5 - 15) wt% (such as 0.5 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt%, 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%, 10.5 wt%, 11 wt%, 11.5 wt%, 12 wt%, 12.5 wt%, 13 wt%, 13.5 wt%, 14 wt%, 14.5 wt% or 15 wt%, etc.), a dispersant (1 - 8) wt% (such as 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt% or 8 wt%, etc.), a thickener (0.2 - 4) wt% (such as 0.2 wt%, 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt% or 4 wt%, etc.), an antifreeze (2 - 8) wt% (such as 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt% or 8 wt%, etc.), a pH regulator (0.1 - 2) wt% (such as 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt% or 2 wt%, etc.) and water (66.9 - 94.4) wt% (such as 66.9 wt%, 72 wt%, 72.5 wt%, 73.5 wt%, 76.5 wt%, 81.5 wt%, 86.5 wt% or 94.4 wt%, etc.).

[0030] In some alternative embodiments, the pH value of the plant growth promoter is selected from 4 - 7 (such as 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9 or 7, etc.).

[0031] In some alternative embodiments, the dispersant is selected from at least one of sulfonate anionic dispersants (such as YUS - SXC dispersant), polycarboxylate anionic dispersants (such as YUS - WG5 dispersant or YUS - CH7000 dispersant, etc.).

[0032] In some alternative embodiments, the dispersant is a mixture of sulfonate anionic dispersant and polycarboxylate anionic dispersant. In some other alternative embodiments, the dispersant is a mixture of sulfonate anionic dispersant and polycarboxylate anionic dispersant, wherein the weight ratio of the sulfonate anionic dispersant to the polycarboxylate anionic dispersant is 1:(3 - 5) (such as 1:3, 1:3.1, 1:3.2, 1:3.3, 1:3.4, 1:3.5, 1:3.6, 1:3.7, 1:3.8, 1:3.9, 1:4, 1:4.1, 1:4.2, 1:4.3, 1:4.4, 1:4.5, 1:4.6, 1:4.7, 1:4.8, 1:4.9 or 1:5, etc.). In some specific embodiments, the sulfonate anionic dispersant is selected from YUS - SXC dispersant. In some specific embodiments, the polycarboxylate anionic dispersant is selected from YUS - WG5 dispersant.

[0033] In some alternative embodiments, the thickener is selected from at least one of xanthan gum, magnesium aluminum silicate, and hydroxyethyl cellulose. In some specific embodiments, the thickener is selected from xanthan gum.

[0034] In some alternative embodiments, the antifreeze is selected from polyhydroxy antifreezes. Among them, the polyhydroxy antifreezes are selected from at least one of 1,2 - ethylene glycol (CAS No. 107 - 21 - 1), 1,2 - propylene glycol (CAS No. 57 - 55 - 6), 1,3 - propylene glycol (CAS No. 504 - 63 - 2), and 1,2,3 - glycerol (CAS No. 56 - 81 - 5). In some specific embodiments, the antifreeze is selected from 1,2 - ethylene glycol.

[0035] In some alternative embodiments, the pH regulator is selected from organic acid-based pH regulators. Further, the organic acid-based pH regulators are selected from at least one of Baochan Brand Kangquan 808, citric acid (CAS No. 77-92-9), citric acid monohydrate (CAS No. 5949-29-1), and glacial acetic acid (CAS No. 64-19-7). In some specific embodiments, the organic acid-based pH regulator is selected from Baochan Brand Kangquan 808.

[0036] The present application has the following beneficial effects:

[0037] First, by soaking plant seeds in a solution containing an organic trisulfide compound, it is found that it has a positive effect in promoting the germination of plant seeds and the growth of young buds; and by spraying a solution containing an organic trisulfide compound on the seedlings, it is found that it can stimulate the growth of plant roots and promote the growth and development of the seedlings.

[0038] Second, the organic trisulfide compound can increase crop yields. Specific Embodiments

[0039] The present application discloses the use of an organic trisulfide compound in promoting plant growth. Those skilled in the art can draw on the content of this article and appropriately modify process parameters to achieve it. It should be particularly noted that all such similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present application. The methods and applications of the present application have been described through preferred embodiments, and those skilled in the art can obviously make changes or appropriate alterations and combinations to the methods and applications described herein without departing from the content, spirit, and scope of the present application to implement and apply the technology of the present application.

[0040] Glossary of terms:

[0041] Unless otherwise specified, the following definitions should be applied as used herein. For the purposes of the present application, chemical elements are consistent with the CAS version of the Periodic Table of the Elements and "Handbook of Chemistry and Physics", 75th Edition, 1994. In addition, general principles of organic chemistry can be referred to the descriptions in "Organic Chemistry", Thomas Sorrell, University Science Books, Sausalito: 1999, and "March's Advanced Organic Chemistry" by Michael B. Smith and Jerry March, John Wiley & Sons, New York: 2007, the entire content of which is incorporated herein by reference.

[0042] In the present application, the term "halogen" or "halo" refers to any of the radioactively-stable atoms in column 7 of the periodic table, such as fluorine, chlorine, bromine, or iodine.

[0043] In the present application, the terms "comprising" or "including" are open-ended expressions, meaning including the content specified in the present application, but not excluding other aspects.

[0044] In the present application, the term "alkyl" refers to a straight-chain or branched-chain alkane chain that is fully saturated (i.e., contains no carbon-carbon double bonds or carbon-carbon triple bonds). The alkyl group can have 1 to 6 carbon atoms (whenever a numerical range such as "1 to 6" appears in the text, the numerical range refers to each integer within the given range; for example, "1 to 6 carbon atoms" means that the alkyl group can consist of 1 carbon atom, 2 carbon atoms, 3 carbon atoms, 4 carbon atoms, 5 carbon atoms, or 6 carbon atoms, but this definition also covers the term "alkyl" where no numerical range is specified). By way of example only, "C 1-3 alkyl" means having one to three carbon atoms in the alkyl chain, i.e., the C 1-3 alkyl is selected from methyl, ethyl, propyl, and isopropyl. The alkyl group can be substituted or unsubstituted.

[0045] In the present application, the term "unsubstituted" means that the specified group does not carry a substituent.

[0046] In the present application, the terms "substituted", "being substituted", and "substitution" are used interchangeably, meaning that any one or more hydrogen atoms in the given structure are replaced by a specific substituent (e.g., C1-3 alkyl, C1-3 alkoxy, or halogen), provided that the normal valence of the specified atom is not exceeded and the substitution results in a stable compound. Unless otherwise indicated, a substituted group can have a substituent substituting at each substitutable position of the group. When more than one position in the given structural formula can be substituted by one or more substituents selected from a specific group, then the substituents can be the same or different and substitute at each substitutable position.

[0047] In the present application, the terms "each... independently selected from", "... each independently selected from", and "... independently selected from" can be interchanged and should be understood in a broad sense, which can either mean that among different groups, the specific options expressed between the same symbols do not affect each other, or it can mean that within the same group, the specific options expressed between the same symbols do not affect each other.

[0048] In the present application, the term "stereoisomer" refers to a compound having the same chemical constitution but different spatial arrangements of atoms or groups. Stereoisomers include enantiomers, diastereomers, conformational isomers (rotational isomers), geometric isomers (cis / trans isomers), atropisomers, and so on.

[0049] In the present application, the term "chiral" refers to a molecule that has the property of not being superimposable on its mirror image; while "achiral" refers to a molecule that is superimposable on its mirror image.

[0050] In the present application, the term "enantiomer" refers to two isomers of a compound that are non-superimposable but mirror images of each other.

[0051] In the present application, the term "diastereomer" refers to stereoisomers that have two or more chiral centers and whose molecules are not mirror images of each other. Diastereomers have different physical properties, such as melting point, boiling point, spectroscopic properties, and reactivity. A mixture of diastereomers can be separated by high-resolution analytical operations such as electrophoresis and chromatography, for example HPLC.

[0052] In the present application, the stereochemical definitions and rules used generally follow S.P. Parker, Ed., McGraw-Hill Dictionary of Chemical Terms (1984) McGraw-Hill Book Company, New York; and Eliel, E. and Wilen, S., "Stereochemistry of Organic Compounds", John Wiley & Sons, Inc., New York, 1994.

[0053] In the present application, the terms "optionally", "optional", or "option" generally mean that the subsequent event or condition may or may not occur, and the description includes the cases where the event or condition occurs, as well as the cases where the event or condition does not occur.

[0054] Unless otherwise specified, the reagents used in the present application are all commercially available. Among them, Baoshan Brand Kangquan 808 was purchased from Liaoning Ruicao Biotechnology Co., Ltd.

[0055] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the implementation solutions of the present application in detail with reference to examples.

[0056] Example 1. Preparation of organic trithiol compounds:

[0057] In this example, is taken as an example for introduction, and its synthesis route is as follows: .

[0058] Sodium thiosulfate pentahydrate (4.99 g, 20 mmol, CAS No. 10102-17-7) was dissolved in an aqueous ethanol solution with a volume concentration of 25% (60 mL). The temperature was raised to 60 °C, and 4-chloromethylthiazole (2.67 g, 20 mmol, CAS No. 3364-76-9) was added dropwise at 60 °C. The reaction was continued by stirring at 60 °C for 1 hour until the reaction was completed. The reaction system was cooled to (2-5) °C in an ice-water bath, 1,3-dimethyl-3,4,5,6-tetrahydro-2-pyrimidinone (3.5 mL, abbreviated as DMPU, CAS No. 7226-23-5) was added, and then a water (10 mL) solution of sodium sulfide nonahydrate (2.45 g, 10 mmol) was slowly added dropwise. The mixture was stirred in the ice-water bath for 2 hours, and a large amount of white precipitate was produced. Stirring was stopped, and filtration was carried out to obtain the organic trisulfide compound 2q (2.56 g, yield 87.5%) in the form of a white solid.

[0059] The organic trisulfide compounds 2i, 2j, 2k, 2n, 2r, 2w, and 2m were synthesized by the same method in this application. Among them, the characterization data of the organic trisulfide compounds are shown in Table 1.

[0060] Table 1. Characterization data of organic trisulfide compounds:

[0061] ;

[0062]

[0063] Example 2. Evaluation of the effects of organic trithiol compounds on seed germination and seedling growth:

[0064] Wheat seeds with the same growth size were randomly divided into 13 test groups (including 12 experimental groups and 1 blank control group), with 20 wheat seeds in each group.

[0065] The wheat seeds in the experimental groups were soaked in a medicated solution (5 mL) containing the organic trisulfide compound for 12 hours. The preparation method of the medicated solution containing the organic trisulfide compound was as follows: The organic trisulfide compound (0.003 g) was dissolved in dimethyl sulfoxide (0.5 mL) and diluted with water to 5 mL; the concentration of the organic trisulfide compound was 600 ppm.

[0066] The wheat seeds in the blank control group were soaked in water (5 mL) for 12 hours.

[0067] Afterwards, prepare 26 paper cups and punch holes at the bottoms of the paper cups; pour the same weight of vermiculite into each paper cup and moisten it with water until water flows out from the punched holes of the paper cups. Plant 10 wheat seeds in each paper cup, and cover the wheat seeds with about 5 mm thick vermiculite after planting. After 4 days, observe the germination of the wheat seeds and calculate the germination rate of the wheat seeds, measure the germination length of the germinated wheat seeds and calculate the average germination length of the germinated wheat seeds in the same test group. The results are shown in Table 1.

[0068] Table 2. Germination rate and average germination length of wheat seeds in each test group:

[0069]

[0070] As can be seen from Table 2, the germination rate of experimental groups 1 - 11 is ≥ 90%, and the germination rate of experimental group 12 is slightly lower. However, in terms of germination length, experimental groups 1 - 12 are all better than the blank control. Overall, the promoting effects of experimental groups 3, 4, 7, 8, 9, and 11 are better. Thus, it can be seen that the organic trisulfide compound can promote seed germination.

[0071] Example 3. Evaluation of the effects of organic trithiol compounds on plant root growth and seedling development:

[0072] Select wheat seedlings with consistent growth and randomly divide them into 13 test groups (including 12 experimental groups and 1 blank control group).

[0073] The wheat seedlings in the experimental groups are sprayed with a liquid medicine containing an organic trisulfide compound. The preparation method of the liquid medicine containing an organic trisulfide compound is as follows: dissolve the organic trisulfide compound (0.06 g) in dimethyl sulfoxide (1 mL), and dilute it with water to 100 mL; the concentration of the organic trisulfide compound is 600 ppm.

[0074] The wheat seedlings in the blank control group are sprayed with water.

[0075] Two weeks after spraying the medicine, observe the growth of the wheat seedlings, and randomly select 10 wheat seedlings in each test group. Measure the seedling height of the wheat seedlings and calculate the average seedling height of the wheat seedlings in the same test group, and measure the root length of the wheat seedlings and calculate the average root length of the wheat seedlings in the same test group. The results are shown in Table 3.

[0076] Table 3. Average seedling height and average root length of wheat seedlings in each test group:

[0077]

[0078] As can be seen from Table 3, the average seedling height of Experimental Groups 1-4, 6-11 is superior to that of the blank control group, while the average seedling height of Experimental Groups 5 and 12 is slightly lower than that of the blank control group; however, the average root length of Experimental Groups 1-12 is significantly superior to that of the blank control group, and the root system is more developed. Overall, Experimental Groups 3, 4, 5, 7, 8, 9, and 10 have better promotion effects. This shows that the organic trisulfide compound can promote the growth of plant seedlings, especially making the root system of plant seedlings more developed.

[0079] Example 4. Preparation of Plant Growth Promoter:

[0080] In this example, the ingredient list of the plant growth promoter is shown in Table 4.

[0081] Table 4. Ingredient List of Plant Growth Promoter:

[0082]

[0083] Among them, the preparation process of the plant growth promoter is as follows: First, mix the organic trisulfide compound, YUS-SXC dispersant, YUS-WG5 dispersant, xanthan gum, and ethylene glycol; then, add Baochang brand Kangquan 808 and make up to 100 g with water; finally, stir for 2 hours.

[0084] Example 5. Evaluation of the effects of plant growth promoters on plant seedling development:

[0085] Select wheat seedlings with consistent growth vigor (height about 10 cm) and randomly divide them into 13 test groups (including 12 experimental groups and 1 blank control group).

[0086] Prepare the medicament containing the plant growth promoter: Dilute the plant growth promoter with water to a concentration of 1.5 g (calculated based on the plant growth promoter) / L.

[0087] The wheat seedlings in Experimental Groups 1-6 are sprayed with the medicament containing Plant Growth Promoter I.

[0088] The wheat seedlings in Experimental Groups 7-12 are sprayed with the medicament containing Plant Growth Promoter II.

[0089] The wheat seedlings in the blank control group are sprayed with the medicament containing Plant Growth Promoter III.

[0090] One week after spraying the medicine, observe the growth vigor of the wheat seedlings, randomly select 10 wheat seedlings from each test group, weigh them, and calculate the average weight. The results are shown in Table 5.

[0091] Table 5. Average Weight of Wheat Seedlings in Each Test Group:

[0092]

[0093] As can be seen from Table 5, for the promoting effect on the growth of plant seedlings, Experimental Groups 1-12 are all superior to the blank control group. Thus, it can be seen that the organic trisulfide compound can promote the growth of plant seedlings, and as the content of the organic trisulfide compound in the plant growth promoter increases, the growth trend of the plant seedlings first increases and then decreases. Among them, the promoting effects of the organic trisulfide compound with contents of 5wt% and 10wt% in Plant Growth Promoter I are relatively good, and 10wt% is the best. However, considering the cost and promoting effect comprehensively, 5wt% is preferably selected. The effect is the best when the content of the organic trisulfide compound in Plant Growth Promoter II is 5wt%.

[0094] In addition, for the promoting effect on the growth of plant seedlings, organic trisulfide compound 2q is superior to organic trisulfide compound 2n.

[0095] Example 6. Field experiment of plant growth promoters:

[0096] In this embodiment, Plant Growth Promoter II (the content of organic trisulfide compound 2q is 5wt%) is selected for field experiments.

[0097] Prepare the medicament containing the plant growth promoter: Dilute the plant growth promoter with water to a concentration of 1.5 g (calculated based on the plant growth promoter) / L.

[0098] Specifically, a wheat field in Jiangsu is selected as the experimental plot, with three mu for the experimental plot and three mu for the control plot.

[0099] For the three mu of the experimental plot, the medicament containing the plant growth promoter is sprayed twice at around 10:00 am on April 5, 2023 and around 10:00 am on April 20, 2023 respectively. A total of two sprays are made, and 40 g of the plant growth promoter is used each time (equivalent to 5 g of the organic trisulfide compound each time).

[0100] For the three mu of the control plot, no spraying is done.

[0101] Observed ten days after the first spraying, it is obvious that the growth trend of the experimental plot is stronger than that of the control plot. By June, the number of wheat ears in the experimental plot is significantly more and plumper than that in the control plot. The harvest is by machine on June 10, 2023. The yield of the control plot is 414 kg / mu, and the yield of the experimental plot is 468 kg / mu, with an increase rate of 13%. This shows that the organic trisulfide compound can promote plant growth and also increase crop yield.

[0102] The above has introduced in detail the application of an organic trithiol compound provided by this application in promoting plant growth. Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. It should be noted that for those skilled in the art of this technology, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An application of an organic trisulfide compound in promoting plant growth, characterized in that: The organic trisulfide compound is selected from , , , and or a pharmaceutically acceptable salt thereof.

2. The use according to claim 1, characterized in that: The application is selected from any of the following: (I), promoting plant seed germination; and / or, (II), promoting the growth of plant shoots; and / or, (III) promoting plant root growth; and / or, (IV) Promote the development of plant seedlings.

3. Use of an organic trisulfide compound in the preparation of a plant growth promoter, characterized in that: The organic trisulfide compound is as defined in claim 1.

4. A plant growth promoter, characterized in that Based on the plant growth promoter, the plant growth promoter includes an organic trisulfide compound (0.5-15) wt%, a dispersant (1-8) wt%, a thickener (0.2-4) wt%, an antifreeze agent (2-8) wt%, a pH regulator (0.1-2) wt% and water (66.9-94.4) wt%; wherein the organic trisulfide compound is as defined in claim 1.

5. The plant growth promoter according to claim 4, characterized in that The pH value of the plant growth promoter is selected from 4-7.

6. The plant growth promoter according to claim 4, characterized in that The dispersant is selected from at least one of a sulfonate anionic dispersant and a polycarboxylate anionic dispersant; And / or, the thickener is selected from at least one of xanthan gum, magnesium aluminum silicate, and hydroxyethyl cellulose; And / or, the antifreeze agent is selected from polyhydroxy antifreeze agents, and the polyhydroxy antifreeze agent is selected from at least one of 1,2-ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol and 1,2,3-propanetriol; And / or, the pH adjuster is selected from organic acid pH adjusters, and the organic acid pH adjuster is selected from at least one of citric acid and acetic acid.

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