Abstract
Temperature stress is a major problem affecting plant distribution and global crop yields. We conducted a meta-analysis of 38 peer-reviewed papers selected from four databases to assess the general responses of plant morphological, physiological, and biochemical variables to plant growth-promoting rhizobacteria (PGPR) inoculation. We summarized the evidence that PGPR inoculation under temperature stress was beneficial to plants, which showed increased plant biomass, photosynthetic pigment accumulation, and the improvement of antioxidant capacity. The PGPR effects are related to the stress temperature, and PGPR can better promote plant growth and development in the temperature range of 5°C–14 °C under cold stress and 40°C–50 °C under heat stress. Additionally, a longer stress period (31–96 d) is associated with photosynthetic pigment accumulation, but has little effect on biomass accumulation and antioxidant capacity. The results of this meta-analysis illustrate that PGPR has the potential to enhance the ability of plants to cope with temperature stress, which will improve our understanding of how PGPR enhances plant temperature tolerance, so as to facilitate the scientific promotion of PGPR utilization.
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