The search for environment-friendly, economical and healthy alternatives to agrochemicals tempted us to evaluate the potential of naturally occurring actinomycetes to improve soil properties, plant growth and photosynthesis, grain yield and chemical composition of economically important cereals (wheat, barley, oat, maize and sorghum). To this end, actinomycetes were isolated from soils of local cereals fields, then their biological activities, namely antibacterial, antiprotozoal, antioxidant, and phenolic and flavonoid contents were evaluated. The four most active isolates (9, 16, 24 and 26) were selected and used for enriching the soils until seed set. Each isolate was separately applied. Seeds of the selected cereals were grown in the actinomycete-enriched soils. The soils were analyzed for their electrical conductivity, pH values, total phenolics, organic matter and mineral content. At the vegetative stage, chlorophyll content and gas exchange rates were measured. Mature seeds were then harvested, the yield was evaluated and the seeds were analyzed for their primary and secondary metabolites. The selected isolates improved the grain yield in all tested cereals and most noticeably in barley and maize as compared to control counterparts. These positive effects were probably a result of increased carbon gain due to higher chlorophyll and photosynthetic rate. Isolate 26 showed the highest effect on grains composition profiles followed by the isolate 16. Phenolics and sugars of all grains increased by treatment with the tested isolates. Isolate 26 was the most effective in this regard. All isolates generally improved vitamins, amino acids and organic acids contents in grains. However, fatty acids profile showed a decrease in the content of all measured fatty acids by isolate 26 and an increase in the contents by isolate 16. These results emphasize the potential of actinomycete enrichment as an alternative to agrochemicals and strongly suggest that they can be used in organic farming.

寻找环境友好，经济和健康的农用化学品替代品，促使我们评估天然放线菌改善土壤特性，植物生长和光合作用，谷物产量以及重要的谷物（小麦，大麦，燕麦，玉米）的化学组成的潜力和高粱）。为此，从当地谷物田的土壤中分离出放线菌，然后评估其生物活性，即抗菌，抗原生动物，抗氧化剂以及酚类和类黄酮的含量。选择了四个活性最高的分离株（9、16、24和26），用于富集土壤直至结实。每种分离物分别施用。所选谷物的种子在富含放线菌的土壤中生长。分析土壤的电导率，pH值，总酚，有机物和矿物质含量。在营养阶段，测量叶绿素含量和气体交换率。然后收获成熟种子，评估产量并分析种子的主要和次要代谢产物。与对照对应物相比，选择的分离物提高了所有测试谷物的谷物产量，最显着的是大麦和玉米。这些积极影响可能是由于较高的叶绿素和光合速率增加了碳的吸收的结果。分离株26对谷物组成的影响最大，其次是分离株16。所有谷物的酚类和糖类都通过测试分离株的处理而增加。在这方面，隔离26是最有效的。所有分离物通常都会改善谷物中维生素，氨基酸和有机酸的含量。