像盐度这样的环境挑战,干旱,真菌植物病原体,和农药直接或/和间接影响环境和农业产量。某些有益的内生链霉菌。可以改善环境压力,并在不利条件下用作作物生长促进剂。在这里,从甘草耐受的真菌植物病原体和非生物胁迫(干旱,盐,和酸碱)。菌株SF1表现出多种促进植物生长的特性,包括吲哚乙酸(IAA)的生产,氨,铁载体,ACC脱氨酶,胞外酶,钾的增溶能力,和固氮。双板实验表明,菌株SF1抑制63.21±1.53%,64.84±1.35%,和74.19±2.88%的枯萎病菌,尖孢镰刀菌,和菌核病,分别。断根试验表明,菌株SF1显著减少了腐烂的切根数量,以及对当归切根的生物防治作用,黄芪,党参占93.33%,86.67%,和73.33%,分别。此外,菌株SF1显著提高了干旱和/或盐条件下乌拉尔草幼苗的生长参数和逆境生化指标,包括胚根长度和直径,下胚轴长度和直径,干重,幼苗活力指数,抗氧化酶活性,和非酶抗氧化剂含量。总之,菌株SF1可用于开发环保生物防治剂,提高植物的抗病活性,并促进干旱和半干旱地区盐碱土中植物的生长。
Environmental challenges like salinity, drought, fungal phytopathogens, and pesticides directly or/and indirectly influence the environment and agricultural yields. Certain beneficial endophytic Streptomyces sp. can ameliorate environmental stresses and be utilized as crop growth promoters under adverse conditions. Herein, Streptomyces dioscori SF1 (SF1) isolated from seeds of Glycyrrhiza uralensis tolerated fungal phytopathogens and abiotic stresses (drought, salt, and acid base). Strain SF1 showed multifarious plant growth promotion characteristics, including the production of indole acetic acid (IAA), ammonia, siderophores, ACC deaminase, extracellular enzymes, the ability of potassium solubilization, and nitrogen fixation. The dual plate assay showed that strain SF1 inhibited 63.21 ± 1.53%, 64.84 ± 1.35%, and 74.19 ± 2.88% of Rhizoctonia solani, Fusarium acuminatum, and Sclerotinia sclerotiorum, respectively. The detached root assays showed that strain SF1 significantly reduced the number of rotten sliced roots, and the biological control effect on sliced roots of Angelica sinensis, Astragalus membranaceus, and Codonopsis pilosula was 93.33%, 86.67%, and 73.33%, respectively. Furthermore, the strain SF1 significantly increased the growth parameters and biochemical indicators of adversity in G. uralensis seedlings under drought and/or salt conditions, including radicle length and diameter, hypocotyl length and diameter, dry weight, seedling vigor index, antioxidant enzyme activity, and non-enzymatic antioxidant content. In conclusion, the strain SF1 can be used to develop environmental protection biological control agents, improve the anti-disease activity of plants, and promote plant growth in salinity soil within arid and semi-arid regions.