Streptomyces halotolerant, its agent and its application in promoting plant growth
A technology of Streptomyces vulgaris and Streptomyces olivine is applied in the application field of promoting plant growth to achieve the effects of stable activity, simple use and low cost
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Embodiment 1
[0026] Example 1: Screening process
[0027] 1. Collect halophyte leaf samples from the saline soil in the coastal zone of Lianyungang City, Jiangsu Province, homogenize and crush the surface-sterilized plant leaf samples in a sterile mortar, and perform gradient dilution with sterile water. Take 10 -2 50 microliters of the diluted homogenate were spread on the separation medium (yeast extract 0.25g, K 2 HPO 4 0.5g, water 1L, pH 7.2).
[0028] 2. After the plate is coated, culture it in a constant temperature incubator at 28°C. Check the colony growth on the plate every 24 hours. After 3-7 days, according to the different characteristics of the colony shape, size, color, etc., select different isolated strains and store them in the ISP 2 solid slope. Pure strains were inoculated into ISP 2 liquid medium, and different concentrations of NaCl (0-15%, interval 1%) were added to the medium, placed on a constant temperature shaker at 28°C, and shake flask culture was carried o...
Embodiment 2
[0029] Example 2: Identification of bacterial strain PE5084
[0030] 1. Observation of culture characteristics: The morphological characteristics of PE5084 cells (hyphae in the base, aerial hyphae, spore filaments, spores, etc.) were observed using the embedded method. The purified PE5084 strain was inoculated on the ISP 2 solid medium, and four-section line was used to grow at 28°C for 7-14 days, and the growth of the strain and the shape of the colony were observed.
[0031] 2. Observation of microscopic morphological characteristics: On the ISP 2 solid medium, dig out a rectangular groove with a size of about 1cm×3cm, smear PE5084 with a bamboo stick around the groove, and place the sterile cover glass on the surface with tweezers. On the groove of the culture medium, after culturing at 28°C for 14 days, the coverslip was taken out with tweezers, glutaraldehyde was added dropwise to the place where the hyphae were on the coverslip, and dried naturally. Observe the imprinte...
Embodiment 3
[0036] Embodiment 3: Detection of growth-promoting performance of bacterial strain PE5084
[0037] Detection of the ability to dissolve inorganic phosphorus: pick a small amount of bacteria and plant them in inorganic phosphorus medium containing calcium phosphate, and cultivate them in a 28°C incubator for 3 to 5 days. Observe whether a transparent circle appears around the colony. If so, it proves that The strain has phosphorus-solubilizing activity. Qualitative detection found that strain PE5084 could dissolve inorganic phosphorus.
[0038] Detection of siderophore activity: Inoculate the strain PE5084 on the CAS detection medium, culture it at 28°C for 5-7 days, observe whether there is a yellow transparent circle around the colony, if it appears, it proves that the strain has siderophore activity, That is positive. Qualitative detection found that strain PE5084 could produce siderophore.
[0039] Detection of plant growth hormone indole acetic acid (IAA): Prepare a 2.5...
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