Pelargonium graveolens L'Hér. well known as rose-scented geranium is used worldwide in perfume, cosmetic, pharmaceutical and food industries. The essential oil and phenolic concentrations for this species were reported to be very low which requires their improvement. The effect of three plant growth promoting bacteria namely Pseudomonas rhizophila S211, Halomonas desertis G11 and Oceanobacillus iheyensis E9 on P. graveolens transplants were evaluated with single, dual and consortium modalities under semi controlled conditions. Significant positive effects on the growth related parameters, leaf and root biomass, photosynthetic pigments and secondary metabolites production were observed with inoculum-specific response. The highest root biomass was recorded with the dual inoculation [H. desertis G11+ O. iheyensis E9] while the inoculum [P. rhizophila S211 + O. iheyensis E9] showed the highest ability to enhance fresh leaf biomass (12.27 ± 0.61 g) leading to an improvement rate of 43.34 % over the control. A significant increase in the amounts of total phenolics and flavonoids contents in the inoculated plants over the control was revealed for all the treatments. The consortium was the most efficient to enhance the contents of total phenolics (105.62 ± 2.95 mg GAE/g DW) and flavonoids (48.55 ± 1.25 mg RE/g DW) resulting in an increase over the control of 67.35 % and 53.59 %, respectively. The essential oil synthesis was enhanced significantly for all the inoculated transplants compared with the control conditions. The dual inoculations resulted in the highest levels of essential oil contents in P. graveolens leaves, followed by the consortium than individual inoculants. The dual inoculation [H. desertis G11 + O. iheyensis E9] gave the highest essential oil amount (0.49 ± 0.03 %) with an increase of 68.96 % over the control (0.29 ± 0.01 %). The GC–MS analyses of the essential oils resulted in the identification of 23 compounds. In all treatments, citronellol (25.84–40.02 %), geraniol (9.67–11.96 %), citronellyl formate (5.35–10.14 %), 2-phenylethyl tiglate (4.58–7.13 %), epi-γ-eudesmol (4.38–5.87 %) and linalool (2.56–4.07 %) are the main compounds with qualitative and quantitative variation. Interestingly, the three dual inoculations gave the highest amounts of citronellol, citronellyl formate and citronellyl tiglate compounds. The highest concentration of the high-value citronellol (40.02 %) which defines the commercial value of P. graveolens was recorded with the inoculum [H. desertis G11+ O. iheyensis E9] resulting in an increase rate of 54.87 % over the control (25.84 %). This study suggests the efficiency of the studied inoculums as promising biofertilizers with significant potentials to enhance P. graveolens biomass and secondary metabolites production which present an alternative biotechnological tool to limit the excessive use of chemical fertilizers.

香叶天竺葵L'Hér。众所周知，玫瑰香型天竺葵在全球范围内用于香水，化妆品，制药和食品工业。据报道，该物种的精油和酚类浓度非常低，需要对其进行改进。三种植物生长促进细菌即的效果假单胞菌rhizophila S211，盐单胞菌的沙漠G11和Oceanobacillus iheyensis E9上P.芸在半对照条件下，用单，双和联合模式评估了移植物。接种物特异性反应对生长相关参数，叶和根生物量，光合色素和次生代谢产物的产生具有显着的积极影响。双重接种[ H. desertis G11 + O. iheyensis E9]记录了最高的根生物量，而接种物[ P. rhizophila S211 + O. iheyensis][E9]显示出增强新鲜叶片生物量的最高能力（12.27±0.61 g），比对照提高了43.34％。对于所有处理而言，都显示出接种植物中总酚和类黄酮含量的量明显高于对照。该联盟最有效地提高了总酚含量（105.62±2.95 mg GAE / g DW）和类黄酮（48.55±1.25 mg RE / g DW）的含量，分别比对照增加67.35％和53.59％ 。与对照条件相比，所有接种的移植物的精油合成均得到显着提高。双重接种导致坟墓体育中的精油含量最高叶，其次是财团，而不是个别接种者。双重接种[ H. desertis G11 + O. iheyensisE9]的精油量最高（0.49±0.03％），比对照（0.29±0.01％）增加68.96％。精油的GC-MS分析结果鉴定出23种化合物。在所有治疗中，香茅醇（25.84–40.02％），香叶醇（9.67–11.96％），香茅酸甲酸酯（5.35–10.14％），钛酸2-苯乙基酯（4.58–7.13％），表-γ-香茅醇（4.38–5.87％） ）和芳樟醇（2.56-4.07％）是具有定性和定量变化的主要化合物。有趣的是，三种双重接种产生的香茅醇，甲磺酸香茅醇酯和香茅酸香茅醇酯化合物的量最高。高值香茅醇（40.02％），其定义的商业价值的最高浓度P.天竺葵记录与接种物[ H.的沙漠G11 +[O. iheyensis E9]导致比对照（25.84％）升高54.87％。这项研究表明，所研究的接种物作为有前途的生物肥料的效率，具有显着的潜力，可增强草食假单胞菌的生物量和次生代谢产物的产生，从而为限制化学肥料的过度使用提供了替代生物技术手段。