Endophytes are bacterial or fungal organisms associated with plants in an obligate or facultative manner. In order to maintain a stable symbiosis, many of the endophytes produce compounds that promote plant growth and help them adapt better to the environment. This study was conducted to explore the potential of jute bacterial endophytes for their growth promotion ability in direct and indirect ways. A total of 27 different bacterial species were identified from different varieties of a jute plant (Corchorus olitorius) and different parts of the plant (leaf, root, seed, and seedling) based on 16S rRNA gene sequence. Two of the isolates showed ACC deaminase activity with Staphylococcus pasteuri strain MBL_B3 and Ralstonia solanacearum strain MBL_B6 producing 18.1 and 8.08 μM mg⁻¹ h⁻¹ α-ketobutyrate respectively while eighteen had the ACC deaminase gene (acdS). Fourteen were positive for siderophore activity while Kocuria sp. strain MBL_B19 (133.36 μg/ml) and Bacillus sp. strain MBL_B17 (124.72 μg/ml) showed high IAA production ability. Seven bacterial strains were able to fix nitrogen with only one testing positive for nifH gene. Five isolates exhibited phosphorus utilization ability with Bacillus sp. strain MBL_B17 producing 218.47 μg P/ml. Three bacteria were able to inhibit the growth of a phytopathogen, Macrophomina phaseolina and among them Bacillus subtilis strain MBL_B4 was found to be the most effective, having 82% and 53% of relative inhibition ratio (RIR) and percent growth inhibition (PGI) values respectively. Nine bacteria were tested for their in vivo growth promotion ability and most of these isolates increased seed germination potential and vigour index significantly. Bacillus subtilis strain MBL_B13 showed 26.8% more vigour index than the control in which no bacterial inoculum was used. All inoculants were found to increase the dry weight of jute seedlings in comparison to the control plants and the most increase in fresh weight was found for Staphylococcus saprophyticus strain MBL_B9. Staphylococcus pasteuri strain MBL_B3 exhibited diverse in vitro growth promotion activity and significant growth promoting effect in in vivo pot experiments. These bacterial strains with plant growth enhancing abilities have the potential to be used as bioinoculants.

内生细菌是专性或兼性方式与植物结合的细菌或真菌生物。为了保持稳定的共生关系，许多内生菌会产生促进植物生长并帮助它们更好地适应环境的化合物。进行这项研究以探索黄麻细菌内生菌以直接和间接方式促进其生长的潜力。根据16S rRNA基因序列，从不同品种的黄麻植物（Corchorus olitorius）和植物的不同部位（叶，根，种子和幼苗）中鉴定出总共27种细菌。其中两个分离株对巴斯德葡萄球菌MBL_B3和青枯雷尔氏菌显示ACC脱氨酶活性MBL_B6菌株分别产生18.1和8.08μMmg ^-1  h ^-1α-酮丁酸，而18个菌株具有ACC脱氨酶基因（acdS）。十四是铁载体活动阳性，而科库里亚。MBL_B19菌株（133.36μg/ ml）和芽孢杆菌（Bacillus sp。）MBL_B17菌株（124.72μg/ ml）显示出较高的IAA生产能力。七个细菌菌株能够固定氮，其中只有一个检测到的nifH基因呈阳性。五个分离株表现出对芽孢杆菌的磷利用能力。菌株MBL_B17产生21​​8.47μgP / ml。三种细菌能够抑制植物病原体菜豆（Macrophomina phaseolina）的生长，其中发现枯草芽孢杆菌菌株MBL_B4最有效，分别具有82％和53％的相对抑制率（RIR）和百分生长抑制（PGI）值。测试了九种细菌的体内生长促进能力，其中大多数分离株显着提高了种子发芽的潜力和活力指数。枯草芽孢杆菌MBL_B13菌株的活力指数比未使用细菌接种的对照高26.8％。与对照植物相比，所有接种物均增加了黄麻幼苗的干重，而腐生葡萄球菌菌株MBL_B9的鲜重增加最多。巴氏葡萄球菌菌株MBL_B3表现出多样性在体外生长促销活动，并在显著增长的促进作用在体内盆栽试验。这些具有植物生长能力的细菌菌株具有用作生物菌剂的潜力。