Bacterial endophytes ubiquitously colonize the internal tissues of plants and promote the plant growth through diverse mechanisms. The current study describes the mechanistic basis of plant-specific adaptations present in an extremely beneficial endophytic bacterium. Here, the endophytic Bacillus subtilis Dcl1 isolated from the dried rhizome of Curcuma longa was found to have the drought tolerance, IAA and ACC deaminase production and phosphate solubilization properties. The whole genome sequencing and annotation further showed the genome of B. subtilis Dcl1 to have the size of 4,321,654 bp. This also showed the presence of genes for IAA, H₂S, acetoin, butanediol, flagella and siderophore production along with phosphate solubilization and biofilm formation for the B. subtilis Dcl1. In addition, the genes responsible for the synthesis of surfactin, iturin, fengycin, bacillibactin, bacillaene, bacilysin, chitinase, chitosanase, protease and glycoside hydrolase could also be annotated from the genome of B. subtilis Dcl1. Identification of genes for the glycine betaine, glutamate and trehalose further indicated the drought stress tolerance features of B. subtilis Dcl1. The presence of the genetic basis to produce the catalase, superoxide dismutase, peroxidases, gamma-glutamyltranspeptidase, glutathione and glycolate oxidase also indicated the plant oxidative stress protective effect of B. subtilis Dcl1. Identification of these properties and the demonstration of its plant probiotic effect in Vigna unguiculata confirmed the applicability of B. subtilis Dcl1 as a biofertilizer, biocontrol and bioremediator agent to enhance the agricultural productivity.

细菌内生菌普遍存在于植物的内部组织中，并通过多种机制促进植物生长。目前的研究描述了一种极其有益的内生细菌中存在的植物特异性适应性的机制基础。在这里，发现从姜黄干燥根茎中分离的内生枯草芽孢杆菌Dcl1具有耐旱性、IAA 和 ACC 脱氨酶产生以及磷酸盐溶解特性。全基因组测序和注释进一步显示枯草芽孢杆菌Dcl1的基因组大小为4,321,654 bp。这也表明存在 IAA、H ₂基因S、乙偶姻、丁二醇、鞭毛和铁载体的产生以及枯草芽孢杆菌Dcl1 的磷酸盐溶解和生物膜形成。此外，从枯草芽孢杆菌Dcl1的基因组中也可以注释出参与表面活性素、伊图林、芬奇素、杆菌素、杆菌烯、杆菌肽、几丁质酶、壳聚糖酶、蛋白酶和糖苷水解酶的合成基因。甘氨酸甜菜碱、谷氨酸和海藻糖基因的鉴定进一步表明枯草芽孢杆菌Dcl1的干旱胁迫耐受性特征。产生过氧化氢酶、超氧化物歧化酶、过氧化物酶、γ-谷氨酰转肽酶、谷胱甘肽和乙醇酸氧化酶的遗传基础的存在也表明了植物氧化应激的保护作用。枯草芽孢杆菌Dcl1。这些特性的鉴定及其在豇豆中的植物益生菌作用的证明证实了枯草芽孢杆菌Dcl1 作为生物肥料、生物防治和生物修复剂的适用性，以提高农业生产力。