CN111560322A - Root-promoting heat-resistant bacillus and application thereof - Google Patents
Root-promoting heat-resistant bacillus and application thereof Download PDFInfo
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Abstract
The invention provides heat-resistant bacillus for promoting rooting and application thereof, wherein the bacillus is Bacillus tequilensis FJAT-49377 which is preserved in the China general microbiological culture Collection center of China Committee for culture Collection of microorganisms with the preservation number of CGMCC NO. 16330. The bacillus of the invention can promote seed germination, can dissolve phosphorus and fix nitrogen, can improve soil fertility, provides sufficient nutrition for plant growth, has high temperature resistance, and is beneficial to the composting treatment of agricultural wastes.
Description
Technical Field
The invention belongs to the technical field of microorganisms, and particularly relates to a bacillus strain capable of promoting phosphorus dissolution and nitrogen fixation and resisting heat and application thereof in plant growth.
Background
The phosphorus supply level of soil is one of the key factors influencing the growth of plants, 95 percent of phosphorus in the soil is in an invalid form, and the plants are difficult to directly absorb and utilize, so that the phosphorus deficiency phenomenon exists in 74 percent of cultivated land soil in China.
In a crop-microorganism interaction system, Plant growth-promoting rhizobacteria (PGPR) are colonized in the rhizosphere soil of crops, and can effectively decompose insoluble and fixed elements (phosphorus, potassium and the like) in the soil, promote the absorption of the crops on fertilizers and elements in the soil, and further promote the growth, yield increase, disease resistance and the like of the crops. Therefore, the microbial fertilizer with the efficient growth promoting function is screened and developed and applied to agricultural production, potential element resources of soil are fully utilized, and the microbial fertilizer has important significance for improving element shortage of soil such as phosphorus and potassium and the like, reducing environmental pollution and promoting agricultural sustainable development.
Disclosure of Invention
Therefore, a strain for promoting growth, dissolving phosphorus and fixing nitrogen is needed to be provided, and the problem that elements such as phosphorus, potassium and the like in soil cannot be absorbed and utilized by plants is solved.
In order to achieve the purpose, the inventor provides the following technical scheme:
a root-promoting thermotolerant bacillus, comprising: the Bacillus is Bacillus tequilensis FJAT-49377 with the scientific name of Bacillus tequilensis FJAT-49377, is preserved in the common microorganism center of China Committee for culture Collection of microorganisms, has the preservation number of CGMCC NO.16330, the preservation date of 2018, 8 and 21 days and the preservation address of the institute of microorganisms of China academy of sciences, Beijing, China.
The colony morphology of the bacillus FJAT-49377 is as follows: the colony is round, the surface is wet and translucent, and the middle bulge has a fold.
Wherein the fermentation method of the bacillus comprises the following steps: inoculating bacillus into an LB liquid culture medium, and performing shaking culture at 25-35 ℃ for 48-72h to obtain a seed solution; then inoculating the seed liquid into LB liquid culture medium, and culturing for 48-72h under shaking at 30-60 deg.C.
Furthermore, the heat-resistant bacillus for promoting rooting is applied to degrading insoluble phosphate.
Further, the application of the heat-resistant bacillus for promoting rooting in promoting plant seed germination comprises the specific method that the bacillus fermentation liquor is prepared into the fermentation liquor with the concentration of 1 × 105-1.5×105cfu/mL bacterial suspension, soaking seeds for 2-3 days, placing at 25-30 deg.C, and illuminating for 16-20 h/day.
Furthermore, the heat-resistant bacillus for promoting rooting is applied to nitrogen fixation of plants.
Further, the heat-resistant bacillus for promoting rooting is applied to preparation of a phosphate-solubilizing and nitrogen-fixing composite microbial inoculum.
A plant growth promoting microbial inoculum comprises the bacillus.
The invention has the beneficial effects that:
(1) the bacillus of the invention can effectively degrade inorganic phosphorus, promote insoluble phosphate to release phosphorus, and improve the content of soluble phosphorus in soil, thereby obviously promoting the growth of crops, enabling the roots of the crops to be developed, and enhancing the stress resistance of the crops.
(2) The bacillus of the invention can improve the activity of plant seeds, promote the seeds to take root and sprout, and effectively shorten the growth cycle of plants.
(3) The bacillus of the invention can resist high temperature and is beneficial to compost fermentation.
(4) The bacillus of the invention has double effects of dissolving phosphorus and fixing nitrogen, and can be used as a microbial organic fertilizer for improving soil fertility. Nitrogen and phosphorus are essential elements for plant growth, and the bacteria capable of fixing nitrogen and dissolving phosphorus can provide sufficient nutrition for plants in soil deficient in phosphorus and less in nitrogen and improve the soil nutrition structure. If different azotobacter and phosphate-solubilizing bacteria are prepared into bacterial manure, competition between two or more bacteria may exist, and the effects of bacterial strain colonization and phosphate-solubilizing and nitrogen-solubilizing are influenced. The bacterial manure prepared from the bacterial strain with the functions of dissolving phosphorus and fixing nitrogen can avoid the competition effect and better provide nutrition for the growth of plants.
Drawings
FIG. 1 shows the colony morphology of Bacillus FJAT-49377 according to an embodiment.
FIG. 2 is a tree showing the results of identifying the 16S rRNA sequence of Bacillus FJAT-49377 according to an embodiment.
FIG. 3 shows the effect of Bacillus FJAT-49377 on the growth of tomato seeds.
FIG. 4 shows the growth promoting effect of Bacillus FJAT-49377 on tomato seeds.
Detailed Description
To explain technical contents, achieved objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in combination with specific embodiments.
EXAMPLE 1 phosphate solubilization of Bacillus
1. Test materials
1.1 test strains
Test strains: bacillus FJAT-49377, which is isolated from padding of pig farm of Qidu Zhennanyang Utility company, Nidned City of Fujian province, is frozen and preserved in glycerol of-80 ℃ in the China general microbiological culture Collection center with the preservation number of CGMCC NO. 16330.
1.2 culture Medium
Activating a culture medium: (1) LB solid medium (from Producer) recipe: 10g of tryptone, 10g of sodium chloride, 5g of yeast powder, 15g of agar and 1000mL of water, and the pH value is 7.0. (2) LB liquid medium (from Producer) recipe: 10g of tryptone, 10g of sodium chloride, 5g of yeast powder, 1000mL of water and pH 7.0.
Inorganic phosphorus medium (NBRIP medium): glucose 10g, Ca3(PO4)25g，MgCl2·6H2O 5g，KCl0.2g，MgSO4·7H2O 0.25g，(NH4)2SO40.1g, 1000mL of distilled water, natural pH.
Organophosphorus growth medium: 10g of glucose, 0.5g of ammonium sulfate, 0.5g of yeast extract powder, 0.3g of sodium chloride, 0.3g of potassium chloride, 0.3g of magnesium sulfate, 0.03g of ferrous sulfate, 0.03g of manganese sulfate, 0.2g of lecithin, 1.0g of calcium carbonate, 1000mL of distilled water, 15g of agar and 7.0-7.5 of pH.
1.3 preparation of test reagents
Molybdenum antimony storage solution: 153mL of concentrated sulfuric acid (analytically pure, density 1.84g/mL) was weighed out, slowly added to 400mL of distilled water, and stirred until cooled. 10g of ground ammonium molybdate is weighed and poured into the mixture, and stirred to dissolve. Then adding 100mL of 0.5% (5g/L) antimony potassium tartrate solution, cooling, adding water to dilute to 1000mL, shaking up, storing in a brown reagent bottle, wherein the stock solution contains 1% ammonium molybdate and 2.75moL/L sulfuric acid.
Molybdenum antimony color-developing resisting agent: 1.50g of ascorbic acid is weighed out and dissolved in 100mL of molybdenum antimony anti-storage solution, and the solution has short effective period and is suitable for being used along with the preparation.
5mg/L phosphorus standard solution: 0.4394g Potassium dihydrogen phosphate (KH) dried at 50 deg.C2PO4Analytically pure), 100mL of water, 5mL of concentrated sulfuric acid (preservative), and the volume of the water is up to 1L, the concentration of phosphorus is 100mg/L, and the solution can be stored for a long time. Sucking 5mL of the solution into a 100mL volumetric flask, and adding water to a constant volume, wherein the constant volume is a phosphorus standard solution with the concentration of 5mg/L, and the solution is not suitable for long-term storage.
2. Test method
2.1 determination of phosphate solubilizing ability
2.1.1 activation of the test strains
Taking out the test strain in a refrigerator at minus 80 ℃, streaking the test strain in an LB solid agar culture medium plate in a super clean bench when the test strain is warmed to room temperature, and inversely placing the test strain in a biological incubator for culturing for 2d at 30 ℃. And observing the colony morphology after 2d, and selecting a single colony for secondary streak culture to ensure that the activated colony has a single morphology. And (3) selecting a proper amount of single colony to be cultured in an LB liquid culture medium for 2d by a shaking table at 170rpm and 30 ℃ to obtain a seed solution.
2.1.2 liquid Shake flask fermentation
Diluting the seed liquid by 2 times, and detecting OD by an enzyme-labeling instrument600nmCombining with bacterial count under microscope, diluting properly, and adjusting bacterial density to 108cfu/mL (bacterial liquid OD after 2-fold dilution)600nmBetween 0.3 and 0.5), 200. mu.L of each was inoculated into a 50mL centrifuge tube containing 10mL liquid medium of organic and inorganic phosphorus, and shake-cultured at 230rpm and 30 ℃ for 6d, to which 200. mu.L of sterile water was added as a control, and two replicates were made for each test bacterium.
2.1.3 detection of effective phosphorus content in supernatant by MoSb antibody method
a. Preparation of supernatant
And centrifuging the fermentation liquor cultured for 6d at 1200rpm for 30min, taking supernatant, and discarding the precipitate.
b. Drawing of standard curve
Respectively and accurately sucking 0, 2, 4, 6, 8 and 10mL of 5mg/L phosphorus standard solution into a 50mL volumetric flask, diluting the solution to about 3/5 points of the total volume by using water, adding 2 drops of 2, 6-dinitrophenol as an indicator, adjusting 50mL/L dilute sulfuric acid (or hydrochloric acid) and 10 percent sodium hydroxide until the solution is just yellowish, accurately adding 5mL of molybdenum-antimony color-resisting agent, shaking up, adding water to fix the volume, and obtaining a standard solution series with phosphorus contents of 0.0, 0.2, 0.4, 0.8 and 1.0mg/L respectively. Shaking, standing at room temperature above 15 deg.C for 30 min. At a wavelength of 700nm, the absorbance was measured, and a standard curve was plotted with the absorbance as the ordinate and the phosphorus concentration (mg/L) as the abscissa.
c. Determination of available phosphorus content in supernatant
Transferring a proper amount of supernatant into a 50mL volumetric flask, diluting with water to about 3/5 parts of the total volume, adding 1-2 drops of dinitrophenol indicator, accurately adding 5mL of molybdenum-antimony color-resisting reagent, shaking up, adding water to a constant volume, keeping the temperature at room temperature above 15 ℃, and standing for 30 min. Reading the absorbance OD700nmThen, the corresponding phosphorus content is checked from the standard curve.
d. Calculating the effective dissolved phosphorus content in the supernatant
The effective phosphorus content p (mg/L) of the supernatant is equal to the concentration of the supernatant, the colorimetric volume and the fractional times of the total volume of the fermentation liquor
Wherein, the concentration of the supernatant fluid is: the concentration mg/L of phosphorus is searched from the standard curve;
colorimetric volume: fixing the volume to 50 mL;
dividing times are the total volume of the fermentation liquor/sampling volume.
Effective phosphorus-dissolving amount P (mg/L) ═ effective phosphorus content of strain supernatant-control supernatant phosphorus content
2.2 phospholytic bacteria morphology and 16s rRNA identification
The shape of the phosphate solubilizing bacteria: and streaking and inoculating the purified bacillus onto an LB plate, and culturing at constant temperature of 30 ℃ for 48 h. After the colonies grow out, the characteristics of the size, the color, the edge uniformity, the wettability and the like of the colonies are observed.
And (3) molecular identification: inoculating the pure strain to LB liquid culture medium, placing the pure strain in a shaking table at 30 ℃, culturing the pure strain to a logarithmic phase, extracting genome DNA of the strain FJAT-49377 by adopting a Tris-saturated phenol method, carrying out PCR amplification by adopting 16S rRNA gene universal primers 27F and 1492R, carrying out PCR reaction programs according to the literature of Zhengxuefang and the like (Zhengxuefang, Liubo, Zhuyangqing, and the like, screening and identifying the bacillus biocontrol strain of tomato bacterial wilt [ J ]. China biological prevention and control institute, 2016,32(5):657-665.), sending PCR products to Shanghai Boshang biotechnology Limited company for sequencing, completing sequence homology comparison by adopting EZBIOCoud, analyzing sequences by MEGA 6.0.6 software and constructing a system development tree.
2.3 determination of high temperature resistance
Preparing a seed solution: picking single colony in LB culture medium, culturing at 30 deg.C at 170rpm for 48h, diluting with sterilized ultrapure water to OD600nm0.75 to 0.85 (bacterial density 10)8Around cfu/mL).
Inoculating 200 μ L of seed solution into 5mL LB liquid culture medium, culturing at 30 deg.C and 60 deg.C respectively at 170rpm for 48h with blank culture medium as control, repeating each strain for 3 times, and detecting OD with enzyme labeling instrument600nmThe value is obtained.
3. Test results
3.1 determination of phosphate solubilizing ability
The phosphate solubilizing ability of Bacillus FJAT-49377 for organic and inorganic phosphorus is shown in Table 1. Experimental results show that the bacillus FJAT-49377 has a relatively obvious phosphate solubilizing effect on inorganic phosphorus, and has a relatively poor phosphate solubilizing effect on organic phosphorus.
TABLE 1 phosphate solubilizing ability of Bacillus FJAT-49377
It can be seen that Bacillus FJAT-49377, a phosphate-solubilizing (inorganic phosphate-degrading) microorganism, promotes apatite Ca3(PO4)2The insoluble phosphate releases phosphorus, and the content of soluble phosphorus in the soil is improved, so that the growth of crops can be obviously promoted, the root system of the crops is developed, and the stress resistance of the crops is enhanced.
3.2 identification of the Strain
3.2.1 Strain morphology
The colony morphology of FJAT-49377 is: the colony is round, the surface is wet and translucent, and the middle bulge has a fold. The colony morphology is shown in FIG. 1.
Identification of 3.2.216S rRNA Gene
The nucleic acid sequence of the 16S rRNA gene of the strain FJAT-49377 is as follows:
TGCAGTCGAGCGGACAGATGGGAGCTTGCTCCCTGATGTTAGCGGCGGACGGGTGAGTAACACGTGGGTAACCTGCCTGTAAGACTGGGATAACTCCGGGAAACCGGGGCTAATACCGGATGGTTGTTTGAACCGCATGGTTCAAACATAAAAGGTGGCTTCGGCTACCACTTACAGATGGACCCGCGGCGCATTAGCTAGTTGGTGAGGTAATGGCTCACCAAGGCAACGATGCGTAGCCGACCTGAGAGGGTGATCGGCCACACTGGGACTGAGACACGGCCCAGACTCCTACGGGAGGCAGCAGTAGGGAATCTTCCGCAATGGACGAAAGTCTGACGGAGCAACGCCGCGTGAGTGATGAAGGTTTTCGGATCGTAAAGCTCTGTTGTTAGGGAAGAACAAGTACCGTTCGAATAGGGCGGTACCTTGACGGTACCTAACCAGAAAGCCACGGCTAACTACGTGCCAGCAGCCGCGGTAATACGTAGGTGGCAAGCGTTGTCCGGAATTATTGGGCGTAAAGGGCTCGCAGGCGGTTTCTTAAGTCTGATGTGAAAGCCCCCGGCTCAACCGGGGAGGGTCATTGGAAACTGGGGAACTTGAGTGCAGAAGAGGAGAGTGGAATTCCACGTGTAGCGGTGAAATGCGTAGAGATGTGGAGGAACACCAGTGGCGAAGGCGACTCTCTGGTCTGTAACTGACGCTGAGGAGCGAAAGCGTGGGGAGCGAACAGGATTAGATACCCTGGTAGTCCACGCCGTAAACGATGAGTGCTAAGTGTTAGGGGGTTTCCGCCCCTTAGTGCTGCAGCTAACGCATTAAGCACTCCGCCTGGGGAGTACGGTCGCAAGACTGAAACTCAAAGGAATTGACGGGGGCCCGCACAAGCGGTGGAGCATGTGGTTTAATTCGAAGCAACGCGAAGAACCTTACCAGGTCTTGACATCCTCTGACAATCCTAGAGATAGGACGTCCCCTTCGGGGGCAGAGTGACAGGTGGTGCATGGTTGTCGTCAGCTCGTGTCGTGAGATGTTGGGTTAAGTCCCGCAACGAGCGCAACCCTTGATCTTAGTTGCCAGCATTCAGTTGGGCACTCTAAGGTGACTGCCGGTGACAAACCGGAGGAAGGTGGGGATGACGTCAAATCATCATGCCCCTTATGACCTGGGCTACACACGTGCTACAATGGACAGAACAAAGGGCAGCGAAACCGCGAGGTTAAGCCAATCCCACAAATCTGTTCTCAGTTCGGATCGCAGTCTGCAACTCGACTGCGTGAAGCTGGAATCGCTAGTAATCGCGGATCAGCATGCCGCGGTGAATACGTTCCCGGGCCTTGTACACACCGCCCGTCACACCACGAGAGTTTGTAACACCCGAAGTCGGTGAGGTAACCTTTAGGAGCCAGCCGCCGAAG(SEQ IDNO:1)
comparing the 16S rRNA gene sequence SEQ ID NO:1 of the strain FJAT-49377 with an EZBioCloud gene database, the strain FJAT-49377 has the closest genetic relationship with Bacillus tequilensis, and the homology of the 16S rRNA gene is 100 percent, so that the strain FJAT-49377 belongs to Bacillus tequilensis Tequilensis. Downloading 16S rRNA gene sequences of strains with higher homology, carrying out comparative analysis, constructing a phylogenetic tree, and forming the phylogenetic tree as shown in figure 2 when a neighbor-Joining method is adopted and the Bootstrap value is 1000 times. In the constructed phylogenetic tree, the strain FJAT-49377 and Bacillus tequilensis are gathered in the same branch.
3.3 high temperature resistance test
The results of the Bacillus FJAT-49377 test at 60 ℃ are shown in Table 2. The experimental result shows that after culturing for 48 hours in the environment with the high temperature of 60 ℃, the bacterial density of the FJAT-49377 strain>5×107cfu/mL. The bacillus FJAT-49377 shows better high-temperature resistance and is particularly beneficial to compost fermentation.
TABLE 2 test results of high temperature resistance of the strains
EXAMPLE 2 growth promoting action of Bacillus
1. Tomato growth promotion test method
Selecting single colony of test strain, inoculating into 250mL conical flask containing 100mL LB liquid culture, and culturing at 30 deg.C for 48h (counting bacteria under microscope, bacterial density up to 10)8cfu/mL or more). The test strain fermentation broth was diluted 1000-fold and clear water was used as control (ck).
Selecting tomato seeds with relatively consistent growth vigor, placing the tomato seeds in a transparent culture box of 9cm with 2-3 layers of filter paper laid at the bottom, placing 15 mung bean seeds in a constant-temperature artificial climate box at 27 ℃, and illuminating for 16h and dark for 8 h. Tracking and observing the tomato germination condition, recording the germination number until no new germination grains appear in 3d continuously, measuring the germ length of the tomato germination radicle machine, and analyzing the promoting effect of the test bacteria on tomato seed germination.
The germination percentage is%
The germination index ∑ (Gt/Dt), where Gt is the number of germinating seeds at t d and Dt is the corresponding number of days of germination.
Vigor index is germination index multiplied by embryo root length (cm)
The test data adopts DPS software and a new double-polarization method (Duncan) to carry out the significance test of the data difference among treatments.
2. Garlic growth promotion test method
Inoculating a test strain in an LB liquid culture medium, culturing for 48h in a shaking table at 30 ℃ and 170rpm to obtain a fermentation liquid, diluting the fermentation liquid by 1000 times with clear water, filling the diluted fermentation liquid into a 150mL conical bottle, putting garlic on the bottle mouth to ensure that the bottom of the garlic is soaked by the bacteria liquid, taking clear water as a Control (CK), and replenishing water at proper time. After incubation at 25 ℃ for 14d in a laboratory greenhouse, the root length was measured.
3. Test results
3.1 tomato growth promotion test results
The comparison between the test group and the ck group is shown in Table 3, figure 3 and figure 4. the experimental result shows that the bacterial concentration of the bacillus FJAT-49377 is about 1 × 10 when the bacillus FJAT-49377 is diluted 1000 times compared with the growth effect of the tomato seeds of the ck control group5-1.5×105cfu/mL, the germination rate, germination index, root length, stem length and seed vigor index of which are 107.90%, 89.07%, 293.84%, 129.38% and 261.66% of ck control respectivelyFive indexes have significant difference from the ck control, and the seeds soaked by the bacteria liquid also have thicker rootstocks. Therefore, the tomato seeds are soaked in the fermentation liquor of the bacillus FJAT-49377, so that the germination and growth of the seeds can be obviously promoted.
TABLE 3 growth promoting ability of Bacillus FJAT-49377 on tomato seeds
Note: in the above table, ab represents significant difference (P <0.05)
3.2 Garlic growth promotion test results
The experimental result shows that the root length of the garlic in the CK group is 70.8mm, and the root length of the garlic in the FJAT-49377 bacteria solution soaking group is 101.2 mm. Compared with CK group, the root length of garlic in the bacteria solution soaking group is increased by 42.29%. Experimental results show that the FJAT-49377 bacterial liquid has an obvious effect of promoting plant rooting.
Example 3 Nitrogen fixation of Bacillus
1. Nitrogen fixation efficiency determination method (national standard NY411-2000)
100mL of nitrogen-free medium (formulation: 0.2g of potassium dihydrogen phosphate, 0.2g of magnesium sulfate heptahydrate, 0.2g of sodium chloride, 5g of calcium sulfate, 10g of mannitol, 0.1g of calcium sulfate dihydrate, 1000mL of water, pH 7.0) was added to a 500mL Erlenmeyer flask and sterilized at 121 ℃ for 30 min. Performing aseptic operation, inoculating two rings of strains to be tested (or 1mL fermentation liquid cultured for 3 d) into each bottle, placing on a shaking table, culturing at 30 deg.C under shaking (120r/min) for 5-7d, taking out, and determining sugar and nitrogen. The sugar is prepared by adopting anthrone photoelectric colorimetry. And (3) measuring nitrogen by adopting a micro photoelectric colorimetric method.
1.1 Anthracene ketone photoelectric colorimetry
1.1.1 test treatment: taking 1-4mL (depending on the sugar content) of the bacteria liquid cultured by fermentation, diluting to 100mL, taking 1.00mL of the diluted solution to put in a colorimetric tube, adding water to 2mL, adding 4mL of anthrone reagent into each tube, shaking up, boiling and heating for 15min, cooling, carrying out colorimetric determination at 620nm, recording absorbance, and simultaneously carrying out blank test.
1.1.2 standard curve plotting: 1.00, 2.00, 4.00, 6.00, 8.00, 10.00 and 20.00mL of 1.000mg/mL glucose standard solution is sucked into a 100mL volumetric flask, water is added to the volumetric flask to the scale, and the solution contains 10, 20, 40, 60, 80, 100 and 200. mu.g/mL of sugar respectively. 1.00mL of the solution was taken out and put into a colorimetric tube, and water was added to 2.00mL of the solution, which was measured by the method of 1.1.1, and the absorbance was recorded. The abscissa is defined by the sugar content of the standard system, and the ordinate is the absorbance to draw a standard curve.
1.1.3 calculation of analytical results
The sugar content (X) in 100mL of the solution was calculated according to formula (C1):
in the formula: m is1- -the test sugar content, μ g/mL, found on the standard curve;
m2- -the sugar content of the blank test, μ g/mL, found on the standard curve;
m-suction fermentation broth volume, mL.
Tolerance difference: a) taking the arithmetic mean value of the parallel measurement as a measurement result;
b) the allowable difference of the results of the parallel measurement is not more than 0.005g/100 mL.
1.2 azotobacter liquid total nitrogen colorimetric determination method
1.2.1 sample preparation and testing: absorbing 1.00mL of azotobacteria liquid into a 30mL digestion tube, adding 3mL of sulfuric acid, adding 0.1g of catalyst and 5 drops of hydrogen peroxide, digesting until the solution is clear, if the reaction solution is not boiled for a long time, adding 1-2 drops of hydrogen peroxide after cooling, continuously boiling until the solution is colorless and transparent, taking down and cooling. Adding a little distilled water, shaking up, dripping 40% (m/V) sodium hydroxide solution until copper hydroxide precipitate (about 11-12mL) appears, adding 20 drops of 50% (m/V) potassium sodium tartrate solution to remove the hydroxide precipitate and mask calcium and magnesium, transferring all test tube liquid into a 100mL volumetric flask, pouring the digestive tract washing liquid into the volumetric flask together, diluting to the scale, and shaking up. Filtering, putting 10.00mL of filtrate into a colorimetric tube, adding 1.00mL of 2mol/L sodium hydroxide, adding 1.00mL of sodium potassium tartrate, adding Neisseria reagent (7.1g of potassium iodide, 10g of mercury iodide dissolved in a small amount of water, and 16g of sodium hydroxide dissolved in 70mL of water), cooling, slowly pouring the former solution into the sodium hydroxide solution, stirring while adding, finally diluting with water to 100mL, standing overnight, taking clear liquid and storing in a brown bottle) for 3mL, shaking uniformly, after 2-3min, pouring into a colorimetric cup, and measuring at 420nm by using a colorimeter. The absorbance was read.
1.2.2 drawing of Standard Curve
Accurately weighing 0.4716g of high-grade reagent ammonium sulfate which is baked at 105 +/-5 ℃ for 1h till constant weight, dissolving in water, diluting to 100mL, wherein the solution contains 1mg/mL of nitrogen, taking 0.05, 0.10, 0.25, 0.50, 1.00 and 2.00mL of the solution, putting the solution into a 100mL volumetric flask, diluting to a scale with water, wherein the nitrogen content is 0.50, 1.00, 2.50, 5.00, 10.00 and 20.00 mu g/mL respectively, taking 1mL of standard solution, putting the standard solution into a colorimetric tube, adding water to 2mL, measuring according to a method of 1.2.1, and recording the absorbance.
And drawing a working curve by using the nitrogen content of the standard solution as an abscissa and the corresponding absorbance as an ordinate.
1.2.3 calculation of analytical results
The nitrogen (X) content is expressed in g/100mL and is calculated according to formula (C2):
in the formula: m is1- -the test nitrogen content found on the standard curve,. mu.g/mL;
m2- -the nitrogen content of the blank test, μ g/mL, found on the standard curve;
m-suction fermentation broth volume, mL.
Tolerance difference: a) taking the arithmetic mean value of the parallel measurement as a measurement result;
b) the permissible difference of the results of the parallel measurement is not more than 0.005 g.
1.3 Nitrogen fixation efficacy calculation
Nitrogen-fixing bacteria take up milligrams of nitrogen from the air per 1g of carbohydrate (sugar) consumed, and nitrogen-fixing potency is expressed as mg nitrogen/g sugar.
2. Test results
The experiment shows that the sugar consumption of the bacillus FJAT-49377 is 147.63mg/L, the nitrogen fixation amount is 2.40mg/L, and the nitrogen fixation efficiency is 16.29 mg/g. Experimental results show that the bacillus FJAT-47377 has better nitrogen fixation capacity.
In view of the above, on the one hand, Bacillus FJAT-49377 has the functions of phosphate-solubilizing and growth-promoting, in the practical application process, the fermentation liquor can be diluted by at least 1000 times, i.e. the bacterial concentration is 1 × 105-1.5×105cfu/mL soaking plant seed to promote germination and growth, and diluting 1000 times fermentation broth, i.e. bacterial concentration 1 × 105-2×105cfu/mL is used as a plant rooting microbial inoculum to promote the growth of plant roots. On the other hand, the bacillus FJAT-47377 has better phosphate solubilizing effect and nitrogen fixation efficiency, can be directly applied as a microbial organic fertilizer to improve soil fertility and better provide nutrition for plant growth; or freeze-drying the bacterial liquid to prepare a solid microbial organic fertilizer which is convenient to store and transport and is used after being dissolved in water; the bacillus FJAT-47377 can also be mixed with other functional strains to prepare a composite microbial inoculum so as to further improve the effects of phosphate solubilizing and nitrogen fixation. On the other hand, the bacillus FJAT-47377 can resist high temperature, is used as a microbial fermentation inoculant for composting agricultural wastes, and can produce a bio-organic fertilizer.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Sequence listing
<110> institute of agricultural biological resources of academy of agricultural sciences of Fujian province
<120> heat-resistant bacillus for promoting rooting and application thereof
<130>49377
<160>1
<170>SIPOSequenceListing 1.0
<210>1
<211>1421
<212>DNA
<213> Bacillus tequilensis (Bacillus tequilensis)
<400>1
tgcagtcgag cggacagatg ggagcttgct ccctgatgtt agcggcggac gggtgagtaa 60
cacgtgggta acctgcctgt aagactggga taactccggg aaaccggggc taataccgga 120
tggttgtttg aaccgcatgg ttcaaacata aaaggtggct tcggctacca cttacagatg 180
gacccgcggc gcattagcta gttggtgagg taatggctca ccaaggcaac gatgcgtagc 240
cgacctgaga gggtgatcgg ccacactggg actgagacac ggcccagact cctacgggag 300
gcagcagtag ggaatcttcc gcaatggacg aaagtctgac ggagcaacgc cgcgtgagtg 360
atgaaggttt tcggatcgta aagctctgtt gttagggaag aacaagtacc gttcgaatag 420
ggcggtacct tgacggtacc taaccagaaa gccacggcta actacgtgcc agcagccgcg 480
gtaatacgta ggtggcaagc gttgtccgga attattgggc gtaaagggct cgcaggcggt 540
ttcttaagtc tgatgtgaaa gcccccggct caaccgggga gggtcattgg aaactgggga 600
acttgagtgc agaagaggag agtggaattc cacgtgtagc ggtgaaatgc gtagagatgt 660
ggaggaacac cagtggcgaa ggcgactctc tggtctgtaa ctgacgctga ggagcgaaag 720
cgtggggagc gaacaggatt agataccctg gtagtccacg ccgtaaacga tgagtgctaa 780
gtgttagggg gtttccgccc cttagtgctg cagctaacgc attaagcact ccgcctgggg 840
agtacggtcg caagactgaa actcaaagga attgacgggg gcccgcacaa gcggtggagc 900
atgtggttta attcgaagca acgcgaagaa ccttaccagg tcttgacatc ctctgacaat 960
cctagagata ggacgtcccc ttcgggggca gagtgacagg tggtgcatgg ttgtcgtcag 1020
ctcgtgtcgt gagatgttgg gttaagtccc gcaacgagcg caacccttga tcttagttgc 1080
cagcattcag ttgggcactc taaggtgact gccggtgaca aaccggagga aggtggggat 1140
gacgtcaaat catcatgccc cttatgacct gggctacaca cgtgctacaa tggacagaac 1200
aaagggcagc gaaaccgcga ggttaagcca atcccacaaa tctgttctca gttcggatcg 1260
cagtctgcaa ctcgactgcg tgaagctgga atcgctagta atcgcggatc agcatgccgc 1320
ggtgaatacg ttcccgggcc ttgtacacac cgcccgtcac accacgagag tttgtaacac 1380
ccgaagtcgg tgaggtaacc tttaggagcc agccgccgaa g 1421
Claims (8)
1. A root-promoting thermotolerant bacillus, comprising: the Bacillus is Bacillus tequilensis FJAT-49377 with the scientific name of Bacillus tequilensis FJAT-49377, is preserved in the common microorganism center of China Committee for culture Collection of microorganisms, has the preservation number of CGMCC NO.16330, the preservation date of 2018, 8 and 21 days and the preservation address of the institute of microorganisms of China academy of sciences, Beijing, China.
2. The root-promoting thermotolerant bacillus of claim 1, wherein: the fermentation method of the bacillus comprises the following steps: inoculating bacillus into an LB liquid culture medium, and performing shaking culture at 25-35 ℃ for 48-72h to obtain a seed solution; then inoculating the seed liquid into LB liquid culture medium, and culturing for 48-72h under shaking at 30-60 deg.C.
3. Use of the root-promoting thermotolerant bacillus of claim 1 to degrade poorly soluble phosphates.
4. Use of the root-promoting thermotolerant bacillus of claim 1 to promote germination of a plant seed.
5. The composition of claim 4The application of the heat-resistant bacillus for rooting in promoting plant seed germination is characterized in that the bacillus fermentation liquor is prepared into a fermentation liquor with the concentration of 1 × 105-1.5×105cfu/mL bacterial suspension, soaking seeds for 2-3 days, placing at 25-30 deg.C, and illuminating for 16-20 h/day.
6. Use of the root-promoting thermotolerant bacillus of claim 1 in nitrogen fixation in plants.
7. The application of the heat-resistant bacillus for promoting rooting according to claim 1 in preparation of a phosphate-solubilizing and nitrogen-fixing composite microbial agent.
8. A plant growth promoting microbial inoculum is characterized in that: the microbial inoculum comprises the bacillus of claim 1.
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