Biochemical and Pharmaceutical Traits of Marrubium Vulgare L. Plants Treated with Plant Growth-Promoting Bacteria and Elevated CO2.

The present research aimed to understand the influence of plant growth-promoting bacteria (PGPB) on various biochemical, nutritional, and pharmaceutical characteristics of Marrubium vulgare plants grown under elevated carbon dioxide (eCO2). To achieve this objective, a pot experiment was carried out, consisting of two treatments, namely: (i) biofertilization (Bf) by a PGPB strain (Micromonospora sp.) and (ii) two different air CO2 levels, including ambient CO2 (aCO2) and eCO2 concentrations (410 and 710 μmol CO2 mol−1, respectively). The improvement in the photosynthesis rate of eCO2 and Bf-treated plants can explain the increase in the production of carbohydrate. This is evidenced by a substantial rise, reaching up to + 75