KR101086367B1 - Bacillus aryabhattai LS9 promoting the growth of plants and use thereof - Google Patents

Abstract

The present invention relates to a new strain Bacillus ariabatai LS9 having a plant growth promoting activity and its use, and more particularly, to a microbial agent comprising a Bacillus ariabatai LS9 strain having a plant growth promoting activity, the strain or a culture of the strain. And it relates to a method for promoting plant growth using the strain. Bacillus ariabatai LS9, a new strain according to the present invention, has excellent activity for producing plant growth promoting hormones, solubilizes insoluble phosphoric acid immobilized in soil, and when plant cultures of strains are treated to plants, It has an excellent effect of promoting activity, and in addition, it is very eco-friendly and has a high microbial fertilizer to increase the productivity of plants. It can be usefully used for the preparation of.

Description

Bacillus aryabhattai LS9 promoting the growth of plants and use according to the new strain Bacillus ariabatai L9 having plant growth promoting activity

The present invention relates to a new strain Bacillus ariabatai LS9 having a plant growth promoting activity and its use. More specifically, the present invention relates to a Bacillus ariabatai LS9 having plant growth promoting activity, a microbial agent comprising a culture of the strain or strain and a method of promoting plant growth using the strain.

In agriculture, fertilizers are an important source of agricultural crops. However, when used too much, it may cause eutrophication of river water, water pollution of groundwater, imbalance of soil nutrients, and poor growth of crops, which may lead to a decrease in crop yield and a decrease in crop quality. Therefore, the only alternative that can increase the income of farmers and satisfy the right of consumers to live healthy in the present time when the natural environment and human health are seriously threatened by the fertilizer or pesticide that is excessively used to increase agricultural productivity. Can be said to develop environmentally friendly farming methods.

However, the use of fertilizer to increase the productivity of crops is inevitable due to the reduction of cropland area due to the development and diversification of the industry. Therefore, there is increasing interest for the development of environment-friendly functional agricultural materials using microorganisms than conventional chemical fertilizers.

Due to this interest, the consumption of chemical fertilizers has been continuously decreasing since the early 1990s, and since 1997, chemical fertilizers have been reduced by inducing fertilization, composting, and using organic fertilizers. The use of fertilizers is further reduced. The consumption of chemical fertilizers decreased to 1,104 thousand tons in the early 1990s, 954 thousand tons in 1995 and 801 thousand tons in 2000, and even more in 2005, while the consumption of compost and organic fertilizers is increasing. It is a trend. However, domestic chemical fertilizer use is still the highest among OECD countries.

In addition, as one of the environmentally friendly agricultural technology, a method of cultivating crops using soil microorganisms has recently been used. Currently, crops using soil microorganisms are widely grown in legumes. Microorganisms mainly used for the cultivation of such crops include Rhizobium (Rhizobium). When a legume is infected by this strain, root nodule is formed and gaseous nitrogen is combined with hydrogen. Nitrogen fixiation is carried out to convert to ammonia nitrogen (NH₃). In particular, nitrogen fixation is of great agricultural importance. This is a natural consequence of nitrogen deficiency in fertilized soils, but legumes with root gall under such soil conditions resolve the problem of nitrogen deficiency by themselves. It is possible to grow under soil conditions that are deficient and cannot grow (Stacey et al., Mol. Plant-Microbe Interact. 1991, 4: 332-340).

Among soil microorganisms, microorganisms that promote plant growth without having a symbiotic relationship with host plants include plant growth-promoting rhizobacteria (PGPR), which was discovered by Kloepper et al. In 1980. Representative microorganisms include Azospirrilum (Okon, 1985) and Pseudomonas (Kloepper et al., 1980). These plant growth-promoting microorganisms can be planted by various functions such as fixation of aerial nitrogen (Boddy and Dobereiner, 1995), promotion of nutrient absorption of plants (Hallmann et al., 1997), and inhibition of plant disease (Pleban et al., 1995). It is known to help.

Phosphorus (P), on the other hand, is one of the most important nutrients that plants need as one of the limiting factors for plant growth in the soil, but the phosphoric acid in the soil is iron (Fe ^{2 +} , Fe ^{3 +} ), aluminum (Al ^{3 +} ). , calcium ions (Ca ^{2 +)} in combination with Ca ₃ (PO ₄₎ present is converted to insoluble acid form of _{2, FePO 4, AlPO 4 (} Whitelaw, et al., 1999). Therefore, as one of the methods to solubilize the insoluble phosphoric acid accumulated in the soil, researches using microorganisms that produce organic acids have been continuously conducted. The research on phosphate solubilizing bacteria has increased the crop yield by developing microbial fertilizers in Russia and Eastern Europe since the 1950s. After the announcement, many studies are underway at home and abroad.

However, the solubilization of phosphorus is the main mechanism by acidification in the medium, it is not easy to apply this method to the actual soil having a buffer against pH.

Therefore, it is not only excellent in producing substances that promote plant growth, but also by inoculating the soil with microorganisms (phosphate-solubilizing microorganism (PSM)) which can directly solubilize insoluble phosphoric acid fixed in the soil. If solubilized, it would be beneficial to increase plant productivity and further reduce environmental pollution as well as economic effects on the agricultural industry (Son, et al., 2003; Whitelaw et al., 1999).

The present inventors have completed the present invention by isolating and identifying a novel strain having the activity of producing a large amount of substances that promote the growth of plants and having the ability to solubilize insoluble phosphoric acid fixed in the soil.

Accordingly, an object of the present invention is Bacillus ariabatai having the rDNA sequence of SEQ ID NO: 1 to promote the growth of plants ( Bacillus aryabhattai ) to provide the LS9 strain (KCTC 11657BP).

Another object of the present invention is to provide a culture cultured the strain according to the present invention.

Another object of the present invention is to provide a microbial preparation for plant growth promotion, containing the strain according to the present invention or a culture thereof as an active ingredient.

Another object of the present invention is to provide a method for promoting plant growth, comprising the step of treating a plant or seed of a culture or microbial agent of the strain according to the present invention.

A further object of the present invention is to provide a method for solubilizing insoluble phosphate immobilized in soil using the strain according to the present invention or its culture.

In order to achieve the object of the present invention as described above, the present invention Bacillus ariabatai having a rDNA base sequence of SEQ ID NO: 1 to promote the growth of plants ( Bacillus aryabhattai ) LS9 strain (KCTC 11657BP).

In one embodiment of the present invention, the strain may have activity to produce growth hormone of plants or to solubilize insoluble phosphoric acid in soil.

In addition, the present invention Bacillus ariabatai ( Bacillus) aryabhattai ) to provide a culture of the LS9 strain.

In addition, the present invention Bacillus ariabatai ( Bacillus) aryabhattai ) Provides a microbial agent for plant growth promotion containing LS9 strain (KCTC 11657BP) or a culture thereof as an active ingredient.

In one embodiment of the present invention, the microbial agent may be an organic fertilizer for chemical fertilizer replacement.

In addition, the present invention provides a method for promoting plant growth, comprising immersing, spraying, or irrigation of a culture or microbial agent of a strain according to the present invention into a plant or a seed of a plant.

In one embodiment of the present invention, the plant may be a bare land plant.

Furthermore, Bacillus ariabatai ( Bacillus) according to the present invention aryabhattai ) LS9 strain (KCTC 11657BP) or cultures thereof are used to solubilize insoluble phosphate immobilized in soil.

Bacillus ariabatai LS9, a new strain according to the present invention, has excellent activity for producing plant growth promoting hormones, solubilizes insoluble phosphoric acid immobilized in soil, and when plant cultures of strains are treated to plants, It has an excellent effect of promoting activity, and in addition, it is very eco-friendly and has a high microbial fertilizer to increase the productivity of plants. It can be usefully used for the preparation of.

Figure 1a is a photograph showing a colony of Bacillus ariabatai LS9 single strain according to the present invention, Figure 1b is a photograph showing the strain of the present invention observed through a microscope after Gram staining.
2 is a tree showing the results of phylogenetic identification of Bacillus ariabatai LS9 strain according to the present invention.
Figure 3 is a graph showing the growth curve with time of Bacillus ariabatai LS9 strain according to the present invention.
4 is a graph showing the IAA production ability of the Bacillus ariabatai LS9 strain according to the present invention.
5 is a graph showing the IBA production capacity of Bacillus ariabatai LS9 strain according to the present invention.
Figure 6 is a graph showing the ability to produce gibberellin and abscitic acid of the Bacillus ariabatai LS9 strain according to the present invention.
Figure 7 is a graph showing the phosphate solubilizing ability of Bacillus ariabatai LS9 strain according to the present invention.
8 is a spiny barley ( Xanthium) as a culture medium of Bacillus ariabatai LS9 strain according to the present invention. It is a graph showing the result of germinating seeds of italicum Moore).
9 is a spiny barley germinated with a culture solution of Bacillus ariabatai LS9 strain according to the present invention ( Xanthium It is a graph showing the growth of the length of the stem and root of spiny barley tail after 16 days of treatment of the culture solution to the seeds of italicum Moore).
10 is a spiny barley germinated with a culture solution of Bacillus ariabatai LS9 strain according to the present invention ( Xanthium It is a graph showing the dry weight of spiny barley tail after 16 days of the culture solution to the seed of italicum Moore).
FIG. 11 is a photograph showing a spiny tail cultivated using a culture solution of a Bacillus ariabatai LS9 strain according to the present invention and a spiny tail cultivated without using the strain culture solution as a control (B).

The present invention Bacillus ariabatai ( Bacillus) is a new strain that can promote the growth of plants aryabhattai ) is characterized by providing the LS9 strain.

The LS9, a new strain of the present invention, was identified and separated by the present inventors for the first time, and collected the root zone soil of the forget-me-not growing on the bare land, and inoculated by diluting the diluting liquid made by diluting the collected soil to at least a thousand flat medium. a rear, were isolated single strain, it was identified by analysis by a molecular genetic method of the 16S rDNA sequence and look for a single strain isolated result, Ari ahbatayi Bacillus (Bacillus aryabhattai ) was found to be a new strain belonging to the genus (see Example 1).

Accordingly, the present inventors refer to the isolated and identified new strain of the present invention “Bacillus ariabatai ( Bacillus aryabhattai ) was named LS9, and was deposited on February 26, 2010 with the Korea Institute of Bioscience and Biotechnology (KCTC) and assigned the accession number KCTC 11657BP.

On the other hand, plants have a system to cope with and adapt to various environmental changes by regulating growth and development. Throughout the entire plant life cycle, from seed germination to flowering, environmental stimuli and plant development programs are known to increase plant viability through endless interactions. The developmental control of plants according to such environmental stimuli occurs mainly through the interaction between the external environment and the plant's intrinsic development program, and it is known that plant hormones perform essential functions for such interactions.

Gibberellin, a type of plant hormone, is a diterpenoid complex produced by green plants, fungi and bacteria (B. Tudzynski, 1999). Plant growth, seed germination, stem elongation and leaf growth. Are known to regulate flowering and pulp maturation (Neil Olszewski et al. 2002; Rademacher, 1997). These gibberellins are Gibberella fu, the causative agent of bakana disease in which rice grows by Yabuta in 1935. G. fujikuroi was isolated and first identified as the secondary metabolite of the fungus. In addition, 130 kinds are known as a type of gibberellin, and among them, gibberellin 1, 3, 4 and 7 are mainly used for plant cultivation due to their high biological activity.

In addition, other plant hormones include IAA, indole acetic acid or auxin, indolebutyl acid (IBA) and abscisic acid (ABA), which are necessary for plants to germinate and grow in seed, especially stems. It is a kind of plant growth hormone that is involved in the kidney, and the abscis acid is a plant hormone associated with various physiological reactions such as seed development, dormancy or drought, high salinity and response to environmental stress such as low temperature, and photosynthesis. It functions to transport the product toward the seed under development and to promote the synthesis of the storage protein, and if the environment is not appropriate, it inhibits the germination and growth of seeds or shoots, and maintains the survival of the plant. If the water supply is not sufficient, the content of the leaves increases, which regulates functions such as opening and closing of pores, which may affect the effects of moisture stress. And it is known to play a role to help plant growth (Seo, M. and Koshiba, T., Trends Plant Sci ., 7: 41-48, 2002).

The present inventors are the first Bacillus ariabatai ( Bacillus isolated and identified in the present invention) aryabhattai ) LS9 strain (hereinafter referred to as "LS9") was investigated whether there is activity to produce plant growth hormone that acts to promote plant growth, that is, according to an embodiment of the present invention, LS9 of the present invention Plant growth hormone produced from the strain in the culture medium cultured strain was measured the amount of IAA, IBA, gibberellin and ABA, the LS9 strain was found to be able to produce all IAA, IBA, gibberellin and ABA It is had, particularly IAA was found that the culture on the second day, in the case of IBA is the first day of culture, respectively, and 670ug mg protein ^-1 mg protein ^-1 642.6ug hormone is produced (see Fig. 4 and 5).

In addition, as a result of analyzing the production amount of gibberellin and abscitic acid, Bacillus ariabatai LS9, a new strain isolated and identified in the present invention, gibberellin (88.49 ug mg protein ^-1 ) and abscic acid (1.77 ug mg protein ^-1 ) It was found that there is activity to produce, in particular, the production efficiency of gibberellin was found to be very good. These results were reported by Bacillus sp. Is more than 80 times than in RFO41 strain Azospirillum Lipoferum known that conventional excellent capability of producing GA Strains Gibberellin 1 and 2 (GA ₁ GA and ₂₎ the 20 ~ 40 pg ml ^{- 1} showed much higher bihaeseodo as to produce the (Bottini et al 1989)..

Furthermore, in the case of abscis acid produced by the strain of the present invention, Bacillus is known to produce abscis acid in an amount of about 0.3 μg mg protein ^{- 1} . licheniformis It was shown to be significantly superior to the (Ps14) strain.

Therefore, Bacillus ariabatai LS9, a new strain of the present invention has a characteristic of producing a growth hormone of the plant is excellent, the growth hormone of the plant produced by the strain of the present invention is not limited thereto, IAA, IBA, Gibberellin and ABA.

In addition, Bacillus ariabatai LS9 of the new strain of the present invention is characterized by having an activity of solubilizing insoluble phosphoric acid in the soil.

Phosphorus (P) is one of the nutrients needed for plant growth. Phosphoric acid in soil is easily insoluble due to the incorporation of iron and aluminum ions in acid soils and calcium ions in alkaline soils. Only insoluble phosphoric acid is increased. Phosphoric acid actually accounts for about 0.05% (w / w) of the soil, but only 0.01% of the phosphate available to plants or microorganisms. In addition, solubilization is the process of converting poorly soluble phosphate into an ionic form of H ₂ PO ₄ ^- or HPO ₄ ^2- , which is readily available to plants and microorganisms.

In addition, microorganisms capable of solubilizing insoluble phosphoric acid through solubilization reaction have been reported. Such phosphate solubilizing bacteria include Bacillus megaterium, B. polymyxol, and Pseudomonas strata ( Bacteria such as Pseudomonas striata, Pseudomonas sp. (P118 / 89) are known, Penicillium simplicisimaum, Penicillium aurantiogriseum, Penicyl There are also fungi such as P. bilaji, Aspergillus awamori, A. aculeatus, and Aspergillus niger.

In order to investigate whether the Bacillus ariabatai LS9 strain, a new strain isolated and identified in the present invention, has an activity of solubilizing insoluble phosphoric acid in soil, in one embodiment of the present invention, phosphoric acid was added to the strain of the present invention. Phosphoric acid solubilization ability of the culture supernatant was measured by culturing in the medium. As a result, a large amount of parinitrophenyl, which is phosphorylated and eluted from the substrate by the culture supernatant, was eluted. The solubilization capacity of about 588.5 mg1 ⁻¹ was shown 24 hours after inoculation (see FIG. 7).

Through the above results, the present inventors have found that the Bacillus ariabatai LS9 strain, the new strain according to the present invention, can solubilize insoluble phosphoric acid immobilized in soil, and further improve plant growth by solubilized phosphoric acid. I could see that.

Therefore, the present invention Bacillus ariabatai ( Bacillus) is a new strain having the activity of producing plant growth hormone or solubilizing insoluble phosphoric acid in the soil aryabhattai ) LS9 strain can be provided, and the Bacillus ariabatai ( Bacillus) in the present invention aryabhattai ) LS9 strain may have a nucleotide sequence of rDNA of SEQ ID NO: 1.

In addition, the present invention can provide a culture cultured the strain according to the present invention.

The culture may be obtained by culturing in large quantities by a conventional method for culturing bacteria of the genus Bacillus, the culture medium may be a medium containing a carbon source, nitrogen source, vitamins and minerals, for example, one embodiment of the present invention In the example, a conventionally used minimal culture medium was used.

Cultivation of the strain of the present invention is possible under the conditions for culturing ordinary Bacillus microorganisms, for example, may be cultured for 1 to 5 days at 28 ℃ to 32 ℃. More preferably, the culture is carried out at 28 ° C. to 30 ° C. for about 2 to 3 days.

In addition, the culture may also be used in the form of the culture itself including the strain of the present invention, or may be subjected to centrifugation or filtration to remove the culture medium in the culture and recover only the concentrated cells. The steps can be performed by those skilled in the art as needed. The concentrated cells may be frozen or lyophilized according to a conventional method so as not to lose their activity.

In addition, the culture may include a growth hormone of a plant produced from the metabolite or strain of the strain according to the present invention.

Therefore, the present invention can be used as a composition for promoting plant growth, that is, a fertilizer composition containing the strain according to the present invention or a culture thereof as an active ingredient. The composition of the present invention Bacillus ariabatai ( Bacillus aryabhattai ) It may include a crushed cell wall fraction, live bacteria, dead bacteria, dried bacteria or culture of the LS9 strain as an active ingredient, and may further include an excipient or a carrier. The culture may include a culture solution itself cultured in a liquid medium, filtrate (centrifuged supernatant) from which the strain was removed by filtration or centrifugation of the culture solution. The content of Bacillus ariabatai LS9 in the composition may vary depending on the use and formulation of the composition.

The composition according to the present invention may be formulated in the form of a hydrating agent or a liquid, but is not limited thereto. These formulations may be prepared according to methods generally applied in all fertilizers and pesticide chemistries, and preferably the compositions of the present invention may be formulated in the form of agents for promoting plant growth, i. The scope of application of the composition to the plant or the soil from which the plant is grown may vary depending on the type of plant, age, climatic conditions, and the like.

Therefore, the present invention Bacillus ariabatai ( Bacillus aryabhattai ) can provide a microbial agent for plant growth promotion containing the LS9 strain or its culture as an active ingredient, characterized in that the microbial agent is an organic fertilizer for chemical fertilizer replacement.

In addition, the form of the microbial preparation according to the present invention can be prepared in various forms known in the art, for example, when prepared in the form of dry powder or liquid fertilizer, the LS9 strain per g dry powder or liquid 1 ml It is preferable to contain more than 10 ⁷ cells per sugar, more preferably in the range of 10 ⁷ to 10 ⁹ strains. In addition, it is even better if applied to the target crop in the state of live bacteria rather than dead.

In addition, the present invention can provide a method for promoting plant growth using the strain according to the present invention.

As a method for promoting the growth of the plant may be carried out by culturing the culture of the Bacillus ariabatai LS9 strain or the microbial agent of the present invention in the plant or seed of the plant or spraying or irrigation, that is, spraying. In the case of the dipping method, the culture and the preparation may be poured into the soil around the plant or the seeds may be immersed in the culture and the preparation. In the case of irrigation it can be sprayed in a streamlined plants by techniques well known in the art.

Furthermore, the present invention can provide a method for solubilizing insoluble phosphate immobilized in soil using Bacillus ariabatai LS9 strain or a culture thereof according to the present invention.

As described above, the Bacillus ariabatai LS9 strain of the present invention has a phosphate solubilizing ability to solubilize insoluble phosphoric acid present in the soil in the culture medium. Can be promoted.

In addition, according to one embodiment of the present invention, using the strain culture of the present invention as a result of observing the growth of the spiny tail of a wild plant, the control rate of the field rate and the length of the stem and root did not process the culture of the strain In particular, the root length was significantly increased, and the dry weight of the plant was also increased compared to the control group (see FIGS. 8 to 10).

Therefore, the present inventors have found that the present invention can be effective for plant vegetation where the soil is uneven, such as the culture of the strain or strain of the present invention.

As described above, the Bacillus ariabatai LS9 strain identified for the first time in the present invention is excellent in the activity of producing plant hormones that promote the growth of the plant, and in particular, in addition to the excellent ability to produce gerberel to increase the germination rate, It can solubilize phosphoric acid, which plays a large role, and also produces ABA that regulates plant stress. In addition, the effect on the growth of plants in particular, the effect of promoting the growth of the root length is excellent it can be seen that it can be useful for restoring the vegetation vegetation.

Hereinafter, the present invention will be described in detail by way of examples. However, these examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

< Example  1>

According to the invention New owner LS9 Separation of

<1-1> LS9 Isolation of Myocardium Bacteria

Erigeron Growing on Paho Lake Hoanna Plateau, Hwacheon-gun, Gangwon-do canadensis ) was used as a sample for the isolation of root wound bacteria, that is, 1 g of root wound soil and 9 ml of distilled water were continuously diluted from 10 ^-1 to 10 ^-9 to the initial medium (KH ₂ PO ₄ 2.99 g, Na ₂ HPO ₄ 5.96 g, NH ₄ Cl 1.02 g, Nacl 0.53 g, MgSO ₄ 0.15 g of 7H ₂ O, 0.013 g of CaCl ₂ 2H ₂ O, 0.99 g per 1 liter dH ₂ O) were inoculated and then incubated until colonies were formed while maintaining the temperature at 30 ° C. After 3 days of cultivation, 48 distinct colonies with large peripheral rings were selected, and then the selected strains were inoculated after correcting OD ₆₀₀ to 1 in the minimum culture medium and incubated for 3 days at 150 rpm and 30 ° C. Four high strains were selected. In order to find out whether the cultured bacteria were a single strain, plate culture was repeated to check the intrinsic color with naked eyes, and microscopic observation confirmed whether the single strain was a root strain of LS9, a new strain of the present invention, and formed colonies. The form of is shown in Figure 1a.

<1-2> Identification of Isolated Strains

a. Burgess  Analysis according to classification bacteriology manual

After separation into single colonies selected in Example <1-1>, the morphological and biochemical properties were investigated according to Burges' manual of systematic bacteriology, and gram staining was performed.

As a result, it was confirmed that the isolated strain is a Gram-positive strain as described in Table 1 and FIG. 1B.

b. API  System analysis

Thereafter, the strain was identified by an API system (La Balme-les-Grottes, France). First, bacteria colonies were taken with sterile platinum and then suspended in 2 ml of sterile distilled water. Again, the bacteria solution was suspended in 5 ml of sterile distilled water at a concentration of McFalland Standard Solution No. 2 (MccFaland Standard Solution No. 2) provided by the API 50CH kit (BioMerieux, France). The suspension was added to the liquid medium of the API 50CH kit for homogenization, and then 200 μl of each 50 tubes of the API 50CH kit was inoculated. After injecting over the tube with mineral oil, it was incubated for 48 hours at 30 ℃. The culture was analyzed by the API system to confirm 49 carbohydrate fermentation patterns, and the results were identified by inputting the ATB identification computer system.

As a result, the strain selected in <1-1> was found to be a strain having a carbohydrate fermentation pattern of Table 1 below.

c. 16S rDNA  Sequencing

The nucleotide sequence of 16S rDNA of the selected strain was analyzed according to a conventional method known in the art, and the separation was performed by Macrogen Co., Ltd., wherein the sample state was gDNA / cell stock state. In the request details, PCR products by Extracion-gDNA and PCR amplification were analyzed through 16 sequencing reactions, and the primers used for analysis were divided into universal free (SEQ ID NO: 2). And 3 primers were used.

Primer sequence

27F primer (SEQ ID NO: 2): 5'-AgAgTTTgATCMTGGCTCAg-3 ',

1492R (SEQ ID NO: 3): 5'-TACggYTACCTTgTTACgACTT-3 '

As a result, the 16S rDNA base sequence of the strain was found to be 97.7% identical to the 16S rDNA base sequence of Bacillus ariabatai, the base sequence of the strain identified in the present invention is shown in SEQ ID NO: 1. In addition, the systematic results according to the analysis of the nucleotide sequence was prepared according to the neighbor-joining method to which the Jukes-Cantor model is applied, one result is shown in FIG.

 Thus, the present inventors named the strain identified through the above examples "Bacillus ariabatai LS9", which was deposited on February 26, 2010 to the Korea Institute of Bioscience and Biotechnology (KCTC) (Accession No .: KCTC). 11657BP).

<1-3> Growth Characteristics of Isolated Strains

Furthermore, the present inventors dispensed LS9 in a minimal culture medium to examine the growth curve of the Bacillus ariabatai LS9 strain isolated in the above example, and maintained at 30 ° C. and incubated using an incubator at 150 rpm while incubating at 600 nm. OD values were measured for 6 days.

As a result, as shown in Figure 3, the maximum growth appeared over 2 days, the activity from the culture is as shown in Table 1 above. That is, the degree of + in Table 1 represents the activity from the culture.

< Example  2>

According to the invention New strain LS9 Analysis of plant growth promoting activity

<2-1> LS9 On by IAA  And IBA of Generation  Confirm

In order to investigate the plant growth promoting activity of Bacillus ariabatai LS9 according to the present invention isolated and identified in pure water in Example 1, the production capacity of IAA and IBA, which promotes plant growth, was analyzed. For the analysis, LS9 strains were cultured in nutrient broth medium added to tryptophan, and then the amount of IAA and IBA produced was measured, wherein the tryptophan added to the medium had a final concentration of 3 mM. The supernatant of LS9 incubated under these conditions was reacted with Sarkowski's reagent: 150 ml of H ₂ SO ₄ , 250 ml of H ₂ O, and 7.5 ml of 1.5 M FeCl _{3 ·} 6H ₂ O. The chromogenic reaction was quantified by using a spectrophotometer. The absorbance was measured at 535 nm for IAA and 450 nm for IAA. Standard IAA and IBA (Sigma Aldrich Chemical Co., USA) were used. Quantification was performed using the obtained standard curve (Glickmann and Dessaux, 1995).

As a result, as shown in Figures 4 and 5, the LS9 strain according to the present invention was found to have IAA and IBA-producing activity that promotes the growth of plants, especially in the case of IAA cultured for 2 days , the amounts of (670ug mg protein ^-1) appeared to be IAA is produced, in the case of IBA has been shown to produce the greatest amount of IBA first day culture (642.6ug mg protein ^-1).

<2-2> LS9 On by Gibberellin  And Absis Generation  Confirm

Furthermore, the present inventors have found that the LS9 strain of the present invention is IAA. In addition to IBA and LS9 strain isolated in Example 1 to investigate whether it is possible to produce plant hormones of gibberellin and absic acid Brain Heart liquid medium (peptone 27.5 g, D (+) glucose 2.0 g, NaCl 5.0 g, 2.5 g of Na ₂ HPO ₄ , 1 liter dH ₂ O), and then cultured at 30 ° C. for 2 days to determine the gibberellin production of LS9 through HPLC analysis. First, after centrifugation (3000 × g, 4 ° C., 30 min) of 100 ml of the sample incubated for 2 days with the LS9 strain of the present invention, the supernatant was recovered, and the pH of the recovered supernatant was corrected to 2.5, 15 ml of ethyl acetate was added and shaken at 300 rpm for 10 minutes in an extraction stirrer (Recipro shaker RS-1, Jeio Tech, Korea) and extracted three times to recover a total of 45 ml of ethyl acetate layer. Thereafter, 45 ml of acetate was evaporated, and each sample was dissolved in 5 ml of methanol and filtered through a filter of 0.45 μm pore size, which was used as an analytical sample. The analyzer was analyzed using a Luna 5μ C18 2504.60 mm Column (Phenomenex, USA) by HPLC (Waters, USA) and analyzed at a wavelength of 208 265 nm, respectively (Gray and Smith, 2005). In addition, the HPLC performance conditions were performed as described in Table 2 below.

As a result, as shown in Fig. 6, Bacillus ariabatai LS9, a new strain isolated and identified in the present invention, is capable of producing gibberellin (88.49 ug mg protein ^-1 ) and abscic acid (1.77 ug mg protein ^-1 ). It was found that the production efficiency of gibberellin was particularly excellent.

< Example  3>

New strain LS9 Soil Insoluble Phosphate Availability  Research

In order to investigate whether Bacillus ariabatai LS9, a new strain identified in the present invention, can solubilize insoluble phosphoric acid in soil, the following experiment was performed. The culture supernatant was recovered by inoculating LS9 isolated in Example 1 in a nutrient medium containing tricalcium phosphate (Ca ₂ ) ₃ PO ₄ at a level of 500 mg / l (ppm) and incubating at 30 ° C. at 200 rpm. Phosphoric acid solubility was measured over time. The phosphate solubility is determined by determining the substrate reacting with the culture supernatant as p-nitrophenyl phosphate, and then quantifying the para-nitrophenyl (p-nitrophenyl) that is phosphorylated and eluted from the substrate by the culture supernatant. In order to react with vanadomolibdophosphoric acid (vanadomolibdophosphoric acid) was carried out to quantify the color reaction,

As a result, as shown in FIG. 7, it was found that the Bacillus ariabatai LS9 strain of the present invention can solubilize the insoluble phosphoric acid immobilized in the soil, and exhibits a solubilizing ability of about 588.5 mg1 ⁻¹ at 24 hours after inoculation. It was.

< Example  4>

New strain LS9 Measurement of plant growth promoting activity

Ultimately, in order to investigate whether the Bacillus ariabatai LS9 strain of the present invention has an activity capable of directly promoting plant growth, the wild botanical xanthium ( Xanthium) as an experimental plant was used. italicum Moore). First, centrifugation of the culture medium of LS9 cultured in the first medium described in the above Example to dilute the concentration of LS9 strain to the level of 1 × 10 ⁷ (cells / ml), and to promote plant growth while keeping the strain alive. Used as a culture. Thereafter, inoculated with the strain culture solution prepared in the potted prickly pod and analyzed by comparing the germination rate and the length and dry weight of the stem, root, more specifically, 70% ethanol seeds of wild prickly tail After disinfection for 1 min at 10 min in 1% sodium hypochlorite and washed twice with sterile distilled water. 200 g of soil was uniformly placed in a small pot, and each strain was counted using a microscope and a hemoytometer, and the strain population of the culture solution was corrected to be the same (10 ⁷ cells g ^-1 ). Four seedlings were planted per pot, and the strains were inoculated to proceed to five pots per strain, and 25 ml of water was added daily and cultured in an incubator in which the day and night cycles were controlled at 12 hours. The germination rate was examined at 16 days of culture, and the growth and dry weight of stem and root of germinated seedlings were measured. The dry weight was measured after drying at 50 ° C. for 24 hours. In addition, the results after the plant growth promotion experiments were treated using Analysis of Variance (ANOVA, SYSTAT ver.), And the results were displayed at the 95% confidence level. It is marked with * '.

As a result, as shown in Figure 8, the germination rate of the plants cultured with the strain of the present invention (prickly tail) was found to be about 20% better than the control group without the strain, the growth of stems and roots In the case of inoculation with LS9 broth, stems were 1.7% longer and roots were 99.4% longer than those of the control group (see FIG. 9). Overall, plant growth was significantly increased compared to the control group (see FIG. ).

Furthermore, as a result of dry weight measurement of the stems and roots of the barbed tail, as shown in FIG. 10, the inoculation of LS9 culture solution was increased by 15.3% compared to the control group.

Through the above results, the inventors of the present invention identified the bacterium Bacillus ariabatai LS9 has excellent activity for producing plant growth promoting hormones, solubilizing insoluble phosphoric acid fixed in the soil, as well as plant cultures of strains. In the case of treatment, it was found that the activity of promoting the growth of the plant was excellent, and in addition, the growth of the roots was particularly increased in the growth of the plants. It can be expected to be able to grow to indigenous plants for a long time, and ultimately, the Bacillus ariabatai LS9 of the present invention can be used in the manufacture of microbial fertilizers to increase the crop growth and yield of crops replaced with chemical fertilizers. It can be seen that it can be used.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

Korea Research Institute of Bioscience and Biotechnology KCTC11657 20100226

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Claims (8)

Bacillus Ari ahbatayi having an rDNA sequence of SEQ ID NO: 1 to promote the growth of plants (Bacillus aryabhattai ) LS9 strain (KCTC 11657BP). The method of claim 1,
The strain is Bacillus ariabatai ( Bacillus) characterized in that it has the activity of producing plant growth hormone or solubilizing insoluble phosphoric acid in the soil aryabhattai ) LS9 strain (KCTC 11657BP). The Bacillus of claim 1 Ari ahbatayi (Bacillus aryabhattai ) Culture of LS9 strain. The Bacillus of claim 1 Ari ahbatayi (Bacillus aryabhattai ) Microbial agent for plant growth promotion comprising LS9 strain (KCTC 11657BP) or a culture thereof as an active ingredient. The method of claim 4, wherein
The microbial preparation is a microbial preparation, characterized in that the organic fertilizer for chemical fertilizer replacement. A method for promoting plant growth, comprising immersing, spraying or irrigation of the culture of claim 3 or the preparation of claim 4 in a plant or seed of a plant. The method of claim 6,
The plant is a method for promoting the growth of plants, characterized in that the large plant. A method of solubilizing insoluble phosphate immobilized in soil using the strain of claim 1 or a culture thereof.

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