Free living nitrogen fixing bacterium MBC9 and application thereof
A technology of self-generated nitrogen-fixing bacteria and bacteria agent, applied in the direction of application, bacteria, microorganisms, etc., can solve problems such as poor stress resistance, few self-generated nitrogen-fixing bacteria, and unsuitability for desert ecosystems
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Embodiment 1
[0030] The strain was extracted from the surface layer of the desert ecosystem in Ningxia. The climate in this area is arid; the temperature difference between the year and day and night is large (Feng Wei, 2014); the ultraviolet rays are very strong, especially in summer, the ultraviolet intensity is as high as 200-533μW / cm 2 (Pu Aiping, et al., 2005), the radiation index is around level 8. In general, the radiation intensity is 70-130μW / cm 2 Under ultraviolet rays, the radiation time ranges from 15s to 30min, and the sterilization rate can reach more than 99% (Li Xiangyun, et al., 2006, Zhang Fengcai and Yuan Ersen, 1988, Zhang Fuyun and Kuangfan, 2005). The ultraviolet intensity and irradiation time of ordinary sterilization conditions are obviously lower than the ultraviolet intensity in Ningxia summer field, so the strain is highly resistant to ultraviolet rays.
[0031]Weigh 10g of the surface soil sample and put it into 100mL of sterile water with glass beads and let ...
Embodiment 2
[0036] The azototroph MBC9 was inoculated in the primary slant medium and cultured at 30°C for 4 days to obtain the primary strain; the primary strain was inoculated in the secondary liquid medium and cultured with shaking at 30°C for 3 days to obtain Secondary strains; inoculate the secondary strains in the tertiary solid medium, cultivate them at 30°C for 2 days to obtain the tertiary strains; contact the tertiary strains with peat and mix them to obtain the bacterial agent; make the bacterial agent self-generate The content of nitrogen-fixing bacteria MBC9 was 2.9×10 8 cfu / g, the pH value of the bacterial agent is 7.0.
[0037] Wherein, the formula of described primary slant medium is: KH 2 PO 4 0.2g / L, MgSO 4 0.2g / L, NaCl0.2g, CaCO 3 5.0g, mannitol 10.0g, CaSO 4 0.1g, pH7.0, 20g agar, 1000mL distilled water;
[0038] The formula of the secondary liquid medium is: KH 2 PO 4 0.2g / L, MgSO 4 0.2g / L, NaCl0.2g, CaCO 3 5.0g, mannitol 10.0g, CaSO 4 0.1g, pH7.0, distille...
Embodiment 3
[0042] Mix the bacterial agent prepared in Example 2 with the sand according to the mass ratio of 1:10 to obtain a mixture, and then sprinkle the mixture on the soil surface at the southern edge of the Mu Us Sandy Land. The dosage of the bacterial agent is about 500g of the bacterial agent / mu.
[0043] One year after the bacterial agent was inoculated on the bare sand surface without nitrogen fixation activity at the southern edge of the Mu Us Sandy Land, the nitrogen fixation activity could be detected on the surface layer, which was 210.4nmolC 2 h 2 m -2 h -1 , and soil available nitrogen is also 3.16mgkg -1 increased to 18.5mgkg -1 .
[0044] The natural environmental conditions in the Mu Us Sandy Land are very harsh. The main disasters include drought, strong ultraviolet rays, strong winds, sandstorms, dry and hot winds, frost, and hail, which are not conducive to the survival and reproduction of animals, plants, and microorganisms. The Mu Us Sandy Land belongs to a...
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