Plant growth promoting rhizobacteria (PGPR) are a group of bacteria that can increase plant growth; but due to unfavorable environmental conditions, PGPR are biologically unstable and their survival rates in soil are limited. Therefore, the suitable application of PGPR as a plant growth stimulation is one of the significant challenges in agriculture. This study presents an intelligent formulation based on Bacillus velezensis VRU1 encapsulation enriched with nanoparticles that was able to control Rhizoctonia solani on the bean. The spherical structure of the capsule was observed based on the Scanning Electron Microscope image. Results indicated that with increasing gelatin concentration, the swelling ratio and moisture content were increased; and since the highest encapsulation efficiency and bacterial release were observed at a gelatin concentration of 1.5%, this concentration was considered in mixture with alginate for encapsulation. The application of this formulation which is based on encapsulation and nanotechnology appears to be a promising technique to deliver PGPR in soil and is more effective for plants.

中文翻译：

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通过藻酸盐/明胶包封辅以纳米颗粒，评价贝莱森芽孢杆菌对豆类丝核菌的生物防治。

植物生长促进根际细菌 (PGPR) 是一组可以促进植物生长的细菌；但由于不利的环境条件，PGPR 生物不稳定，在土壤中的存活率有限。因此，适当应用 PGPR 作为植物生长刺激是农业中的重大挑战之一。本研究提出了一种基于Bacillus velezensis VRU1 封装的富含纳米颗粒的智能制剂，能够控制立枯丝核菌在豆子上。基于扫描电子显微镜图像观察胶囊的球形结构。结果表明，随着明胶浓度的增加，溶胀率和含水率增加；由于在 1.5% 的明胶浓度下观察到最高的包封效率和细菌释放，因此考虑将该浓度与藻酸盐混合用于包封。这种基于封装和纳米技术的配方的应用似乎是一种很有前途的技术，可以将 PGPR 输送到土壤中，并且对植物更有效。