Effect of Plant Growth-Promoting Bacteria Azospirillum brasilense on the Physiology of Radish (Raphanus sativus L.) under Waterlogging Stress

Stress due to waterlogging is considered an abiotic factor that negatively affects crop production, which, together with the excessive fertilization of crops, reduces cost-effectiveness and generates need create sustainable alternatives economically environmentally. The effect inoculation Azospirillum brasilense on physiology Raphanus sativus var. Crimson Giant subjected waterlogging, was evaluated. Stomatal conductance, chlorophyll concentration a fluorescence were analyzed establish this effect, corroborating beneficial A. in radish under stress. stomatal conductance inoculated waterlogged treatments presented same values as control plants, photosystem II efficiency favored (0.6 Fv/Fm) compared non-inoculated (0.3 Fv/Fm). results suggested increased preservation photosynthetic pigments tissues, allowing reduction amount energy dissipated form heat (fluorescence) brasilense. Therefore, plant growth-promoting bacteria are responsible for activating improving some physiological mechanisms plant.