Metschnikowia pulcherrima inhibiting fungi and application thereof
A technology of yeast and mechi, applied to mechi yeast and its application field, can solve the problems of peach fruit damage, economic loss of fruit farmers, shedding, etc.
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Embodiment 1
[0048] Example 1. Isolation and strain identification of Metschnikowia pulcherrima DPP2 of the present invention
[0049] 1. Sample collection
[0050] Apples are collected from organic orchards in northern China.
[0051] 2. Isolation and screening of strains and antagonistic screening
[0052] Isolate strains from organic fruits, use conventional gradient dilution coating to isolate, use two kinds of media, PDA (containing streptomycin sulfate) and YPD agar (containing streptomycin sulfate), to culture at 28°C respectively, and pick colonies Bacteria with large morphological differences and can be purely cultured were purified and preserved on YPD agar medium, and the primary screening and multiple re-screening of antagonistic bacteria were carried out with Peach brown rot as the target pathogen, and finally a strain with strong antibacterial activity was obtained. Yeast strain, named DPP2.
[0053] 3. Identification of strains
[0054] Morphological, physiological and b...
Embodiment 2
[0056] Example 2. Determination of the Bacteriostatic Spectrum of Metschnikowia pulcherrima (Metschnikowia pulcherrima) DPP2 of the present invention
[0057] Pathogens tested:
[0058] Peach brown rot fungus - Monilinia fructicola (wint.) Rehm;
[0059] Botrytis cinerea Per.ex Fr, the postharvest botrytis cinerea of apples;
[0060] Penicillium expansum Link, 1809, Postharvest Penicillium of Apple
[0061] Penicillium expansum Link, 1809, Postharvest Penicillium of Pear
[0062] Peach postharvest brown rot, apple postharvest cinerea and apple postharvest penicillium were selected as indicator fungi, and the plate confrontation culture method was adopted.
[0063] The specific operation is as follows: Metschnikowia pulcherrima DPP2 strain was cultured on PDA medium at a constant temperature of 28°C for 48h. Phytopathogenic fungi were cultured on a PDA plate at a constant temperature of 25°C for 3-4 days, and a 0.7cm-diameter sterile stainless steel punch was punched from...
Embodiment 3
[0066] Inhibition of Metschnikowia pulcherrima DPP2 on rot lesions caused by four tested plant pathogenic fungi.
[0067] After the peaches were picked, they were treated with DPP2 bacterial solution (the concentration of the bacterial solution was 10 7 cfu / ml, 10 8 cfu / ml, 10 9 cfu / ml) soaked for 30-60 seconds, then air-dried at room temperature, and then stored in the dark at a temperature of 1°C and a relative humidity of 95%. After storage for 21 days, compared with the control group, when the bacterial solution concentration was 10 7 cfu / ml, its control effect is 45%, when the concentration of bacteria solution reaches 10 8 When cfu / ml, its control effect is 65%, when the concentration of bacteria solution reaches 10 9 When cfu / ml, its control effect reaches 68%.
[0068] After the apples were picked, the DPP2 bacterial solution (the concentration of the bacterial solution was 10 7 cfu / ml, 10 8 cfu / ml, 10 9 cfu / ml) soaked for 30-60 seconds, then air-dried at room ...
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