38 results about "Chitinase activity" patented technology

The invention discloses a disease-prevention and growth-promoting Trichoderma harzianum and an application thereof. The strain number of the Trichoderma harzianum is TM2-4, which is registered in theGeneral Microbiology Center of China Microbial Culture Collection Management Committee as CGMCC No. 15881. The Trichoderma harzianum M2-4 can inhibit Botrytis cinerea, Prunus persica, Colletotrichum gloeosporioides and Fusarium oxysporum f. Sp. Cucumerinum on fruits and vegetables, and has good control effect on tomato gray mold in vitro and can promote the germination of tomato seeds and the growth of tomato plants. The Trichoderma harzianum TM2-4 has indoleacetic acid (IAA)-producing activity, ferrophilic activity, glucanase and chitinase-producing activity. The Trichoderma harzianum TM2-4 has high breeding speed and can be cultured artificially, and the culture condition is simple, and the spore production is up to 3.2 * 109 cfu/g on the solid fermentation medium of wheat bran and corncob nutrient solution.

The invention discloses a detection method for disease resistance of cotton verticillium wilt. The detection method comprises the following steps: inoculating a verticillium wilt bacterium into a cotton seedling, detecting the activity of chitinase and/or activity of dextranase in the inoculated cotton seedling; and judging the disease resistance of cotton verticillium wilt according to the activity of chitinase and/or activity of dextranase in the inoculated cotton seedling. According to the detection method, the disease resistance of cotton verticillium wilt is judged by inoculating the verticillium wilt bacterium into the cotton seedling and detecting the activity of chitinase and/or the activity of dextranase in leaves of the inoculated cotton seedling. The method can be used for quickly and accurately acquiring the disease resistance of cotton verticillium wilt in the seedling growing stage without waiting for the cotton seedling to disease. A plant with good disease resistance or tolerance to diseases can be transplanted according to the detection result of the method. Through verification and screening in field morbidity, the anti-disease cotton plants and lines are obtained. The detection method is capable of conveniently obtaining single strains and materials with good disease resistance or tolerance to diseases from the seedling growing stage for direct high yield and quality breeding so as to accelerate the variety breeding process, so that the detection method is suitable for being popularized and applied.

The invention provides a biological compound potash fertilizer and a preparation method of the biological compound potash fertilizer. The biological compound potash fertilizer is prepared by the following steps of: fermenting pathogenic fungus CGMCC (China General Microbiological Culture Collection Center) No.5155 which resists 12.5% of potash and has chitinase activity to obtain a biological potash fertilizer; and mixing 8-15 parts of the biological potash fertilizer, 1-5 parts of dipotassium phosphate and 10-15 parts of humic acid potash fertilizer to prepare the biological compound potash fertilizer. The biological compound potash fertilizer provided by the invention is simple in preparation method, strong in product compositionality and strong in parataxis and has the functions of evenly providing nutrients, improving soil fertility, strengthening the stress resistance of crops, decreasing the crop diseases, improving the quality of agricultural products, decreasing the harmful substances in the agricultural products and the like.

The invention discloses fusion chitinase capable of efficiently degrading alpha-chitin and a related biological material and application thereof. The fusion chitinase is a protein obtained by fusing beta-N-acetyl hexosaminase and chitinase, wherein the chitinase activity of the fusion chitinase is higher than that of the beta-N-acetyl hexosaminase and that of the chitinase; the chitinase is D1) or D2), wherein the D1) is a protein with 53rd-322nd amino acid residues of which the amino acid sequence is shown in SEQ ID No.2; and the D2) is a fusion protein obtained by fusing a protein tag at the carboxyl terminal or/and the amino terminal of the protein shown in D1). The fusion chitinase has a degradation effect on various types of chitin, and has relatively high activity on colloid chitin, alpha-chitin and fungal cell wall chitin; and the fusion chitinase has the capability of completely hydrolyzing chitin and generating N-acetyl glucosamine. The fusion chitinase can be widely applied to biological medicine, biological agriculture, cosmetics, energy industry, etc.

The invention discloses a culture medium for improving chitinase produced by streptomyces sampsonii KJ40 and a chitinase bacteria-containing preparation and application. The culture medium is composed of 100ml/L of colloid chitin with solubility of 2%(w/V), 0.4wt% of soybean cake powder, 1.0(g/L) of K2HPO4, and 0.6(g/L) of KH2PO4. Compared with an enzyme production basic culture medium, the activity of the chitinase produced according to new formulation and fermentation condition disclosed by the invention is raised by 80%. The chitinase bacteria-containing preparation with 50-100 times (volume ratio) dilution can be used for performing root-irrigation on breadth of root system of poplar nursery stock with 100ml for each poplar, and is respectively applied for once in spring and summer so as to prevent violet root rot of the poplar.

The invention relates to a method for prevention and treatment of diseases of longan fruits, wherein the method comprises the steps: (1) before picking, from the beginning of a longan young fruit stage, spraying a disease prevention and treatment liquid on longan; (2) when the maturity of the longan fruits is 80-90%, picking the longan fruits; and (3) soaking the longan fruits after picking in slightly acidic electrolyzed water, soaking for 10-15 min, then taking out, draining water, then carrying out fresh-keeping packaging on the longan fruits after draining, placing the packaged longan fruits under conditions of the temperature of 25-30 DEG C and the relative humidity of 85%-90%, and storing. The method for prevention and treatment of diseases of the longan fruits can improve the longan peel chitinase activity, beta-1, 3-glucanase activity, and the activity of phenylalanine ammonia lyase and other decrease-resistant related enzymes, and delays the decrease of the total phenolic content, so as to effectively control the occurrence of the diseases of postharvest longan fruits.

The present invention discloses endochitinase and a coding gene and application thereof in production of chitobiose. The protein is as follows: (a) or (b) or (c), wherein (a) is a protein comprising 40th-site to 696th-site amino acid residues from N-terminal of a sequence 2; (b) is a protein comprising an amino acid sequence shown as the sequence 2 in a sequence table; and (c) is a chitinase-activity protein which is derived from a sequence 1 and obtained by substitution and / or deletion and / or addition of one or more amino acid residues of the amino acid sequence of the (a) or (b). When the endochitinase is used for production of the chitobiose, conversion rate is high, energy consumption is less, no pollutant is produced, and the endochitinase has important economic value. The protein has a large potential for industrial application.

Excess sludge production in a bioreactor of a wastewater treatment plant in which excess sludge is being produced is reduced by adding an activated sludge material having a chitinase specific activity of at least 150 Units/g-MLSS and a pectinase specific activity of at least 120 Units/g-MLSS to the bioreactor. After the addition of the activated sludge material, the bioreactor is controlled by adding the activated sludge material when any one of the chitinase activity, the pectinase activity, and the protease specific of the sludge in the bioreactor drops below the lower limits of 50 Units/L, 40 Units/L, and 0.3 Units/L, respectively.

The invention relates to a fungal fermentation culture medium and process. More particularly, the invention relates to a culture medium and method for producing chitinase by Lecanicillium fermentation. The formula of the culture medium comprises the following raw materials: 5-15g/L of fructose or maltose, 5-15g/L of yeast extract powder or yeast extract extractum, 2-8*10<-4>mol/L of K<+> or Ca<2+>, 0.05-0.2g/L of Vc or VB6, and the balance of water; and the initial pH of the culture medium is 5.5-7.0. According to the method, a fermented seed solution is inoculated to the culture medium, the liquid containing quantity of a 250 mL triangular flask is 50 mL, the inoculum size is 15mL, and chitinase is cultured at 26 DEG C at the rotational speed of 160 r/min. The fermentation method is short in fermentation period, mild in condition, and easy to control; and the culture medium provided for producing chitinase by Lecanicillium fermentation has the advantages that the chitinase yield is high, the chitinase activity is high, and the like.

The present invention is a method for preparing a biocontrol formulation by the following steps. AStreptomyces bacterium is selected simultaneously with superior sporulation ability, chitinase activity and antagonistic effectiveness against plant fungal pathogens by culturing with fungal pathogens, wherein the selected Streptomyces bacterium is cultured on a chitin-limited plate to assess the ability of sporulation and chitinase activity, and the Streptomyces bacterium with superior sporulation ability is the strain with producing powder-like and maturity form spore chains. Spores from the selected bacterium is collected. The obtained spores are taken as a seed inoculum. Then the seed inoculum is cultured to directly yield a broth medium containing at least 10⁹ viable spores/ml which the spores contained in the broth medium are well suspended. The biocontrol formulation is obtained. The present invention further provided a biocontrol formulation containing a high concentration of Streptomyces spp. spores.

There is provided a method of treating hay for preventing and/or reducing heat damage in high moisture hay and as well to preserve the same, the method including adding to hay a hay preservative including a hay preserving and heat reducing effective amount of at least one enzyme having a chitinase activity, either alone or in combination with a hay preserving and heat reducing effective amount of a yeast of the genus Pichia or a bacteria of the genus Pediococcus. There is also provided a method of treating hay for preventing and/or reducing heat damage in high moisture hay and as well to preserve the same, the method including adding to hay a hay preservative including a hay preserving and heat reducing effective amount of yeast of the genus Pichia.

The invention relates to a long-acting composite enzyme disinfection composition for children and an application thereof. The disinfection composition consists of a composite enzyme dextrin inclusioncompound, a positively charged cationic polymerization group, a stabilizing agent, a humectant and the like, wherein the composite enzymes comprise one or two of lysozyme and lysostaphin, and one or two of chitinase and snailase; and in each gram of the composite enzyme dextrin inclusion compound, the concentration of the lysozyme is 100-200mg/g, the concentration of the lysostaphin is 0.1-1mg/g,the concentration of the chitinase is 100-200mg/g, and the concentration of the snailase is 10-100mg/g. The long-acting composite enzyme disinfection composition for children can for be released slowly for resisting bacteria, can prolong activity and stress resistance of the composite enzymes in a disinfection product in a use environment, and can realize a long-acting antibacterial effect. In addition, the composition has the advantages of wide sterilization spectrum, small skin irritation and no skin coloring problem, has high durability, and can be suitable for both of adults and children with delicate skins.