A dynamic rhizosphere interplay between tree roots and soil bacteria under drought stress

• DOI: 10.7554/elife.79679
• Publication Date: 2022-07-20T12:00:34Z
• Authors: Yaara Oppenheimer...; Gilad Jakoby; Maya L Starr; Romiel Karliner; Gal Eilon; Maxim Itkin; Sergey Malitsky; Tamir Klein
• Keywords: Drought stress; Soil bacteria; Plant Roots; Tree (set theory)

Root exudates are thought to play an important role in plant-microbial interactions. In return for nutrition, soil bacteria can increase the bioavailability of nutrients. However, root typically decrease situations such as drought, calling into question efficacy solvation and bacteria-dependent mineral uptake stress. Here, we tested hypothesis exudate-driven microbial priming on Cupressus saplings grown forest custom-made rhizotron boxes. A 1-month imposed drought concomitant inoculations with a mix Bacillus subtilis Pseudomonas stutzeri , species isolated from soil, were applied using factorial design. Direct counts visualization by confocal microscopy showed that both associated roots. Interestingly, exudation rates increased 2.3-fold under well irrigation. Forty-four metabolites significantly different concentration between irrigated trees, including phenolic acid compounds quinate. When adding these carbon nitrogen sources bacterial cultures species, eight nine stimulated growth. Importantly, phosphorous was maintained only inoculated mitigating drought-induced leaf phosphorus iron. Our observations rate when inoculation regimes combined support idea recruitment beneficial bacteria, especially water