Soil-borne plant pathogenic fungi with a wide host range of crops cause a significant limitation on the global production of agronomic crops. Applications of synthetic pesticides are an important tool for managing plant diseases, but have deleterious influences on the environment as well as its incompatibility with organic agriculture. Recently, Streptomyces spp. became one of the best bio-control agents as a promising environmentally eco-friendly method for effective management of plant diseases. In a previous research, three species of Streptomyces spp., i.e., S. griseus (MT210913 “DG5”), S. rochei (MN700192 “DG4”) and S. sampsonii (MN700191 “DG1” strains) were identified, as exhibiting potent antifungal activities against plant pathogenic fungus, Sclerotinia sclerotiorum in vitro and greenhouse. GC–Mass analysis revealed the presence of 44, 47 and 54 substances of S. sampsonii DG1, S. griseus DG5 and S. rochei DG4, respectively. GC–MS revealed substances, with bio-control activity, were categorized as volatile organic compounds (VOCs), fatty acids and plant growth regulators, etc. GC–MS analysis exhibited the presence of 7, 13 and 20 volatile compounds produced by S. sampsonii, S. rochei and S. griseus, respectively. These substances exhibited potent antifungal activity against various plant pathogenic fungi, i.e., Botrytis cinerea, Macrophomina phaseolina, Rhizoctonia solani and S. sclerotiorum in vitro, by dual-culture assay. The three strains inhibited all the pathogenic fungi in dual-culture assay in the range of 30–73.67%. Also, the produced substances were applied in vivo (in the field) and supported their potential biocontrol agent against S. sclerotiorum as well as possessed significant biological properties for plant health and growth. Applying Streptomyces spp. culture broth in the field enhanced physiological responses of phenols, sugar, chlorophyll, protein contents and parameters as well as the yield of bean plants. In field experiments, foliar application of Streptomyces spp. and their metabolites proved to be a great potential, as promising biocontrol agents, for controlling S. sclerotiorum and enhanced plant growth and yield. S. rochei and S. griseus proved to be strong antifungal, plant growth promoters and environmentally eco-friendly fungicides.

中文翻译：

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三种链霉菌属的抗真菌物质的功效。针对不同的植物病原真菌

土壤传播的植物病原真菌具有广泛的作物宿主范围，严重限制了全球农作物的生产。合成农药的应用是管理植物病害的重要工具，但对环境有有害影响，并且与有机农业不相容。最近，链霉菌属。作为一种有前途的环境友好型植物病害有效管理方法，已成为最好的生物防治剂之一。在先前的研究中，鉴定出三种链霉菌属，即灰链霉菌（MT210913“DG5”）、罗氏链霉菌（MN700192“DG4”）和桑普森链霉菌（MN700191“DG1”菌株），它们表现出强效对植物病原真菌、核盘菌在体外和温室中的抗真菌活性。GC-Mass 分析显示存在 44、S. sampsonii DG1、S. griseus DG5 和 S. rochei DG4 分别有 47 和 54 种物质。GC-MS 显示具有生物防治活性的物质分为挥发性有机化合物 (VOCs)、脂肪酸和植物生长调节剂等。 sampsonii，S. rochei 和 S. griseus，分别。通过双重培养试验，这些物质在体外对各种植物病原真菌，即灰霉病菌、大叶菜属、立枯丝核菌和核盘菌表现出有效的抗真菌活性。三种菌株在双重培养试验中对所有病原真菌的抑制率在 30-73.67% 范围内。此外，所生产的物质被应用于体内（在田间）并支持其潜在的生物防治剂。菌核菌具有重要的植物健康和生长生物学特性。应用链霉菌属。田间培养液增强了豆类植物的酚类、糖类、叶绿素、蛋白质含量和参数的生理反应以及产量。在田间试验中，叶面施用链霉菌属。并且它们的代谢物被证明具有巨大的潜力，作为有前途的生物防治剂，用于控制核盘菌和提高植物生长和产量。S. rochei 和 S. griseus 被证明是强效抗真菌剂、植物生长促进剂和环境友好型杀菌剂。蛋白质含量和参数以及豆类植物的产量。在田间试验中，叶面施用链霉菌属。并且它们的代谢物被证明具有巨大的潜力，作为有前途的生物防治剂，用于控制核盘菌和提高植物生长和产量。S. rochei 和 S. griseus 被证明是强效抗真菌剂、植物生长促进剂和环境友好型杀菌剂。蛋白质含量和参数以及豆类植物的产量。在田间试验中，叶面施用链霉菌属。并且它们的代谢物被证明具有巨大的潜力，作为有前途的生物防治剂，用于控制核盘菌和提高植物生长和产量。S. rochei 和 S. griseus 被证明是强效抗真菌剂、植物生长促进剂和环境友好型杀菌剂。