The role of biofertilizers in reducing the adverse effects of drought stress and adjustingwater deficit conditions in maize (Zea maize L.) SC۷۰۴

Drought stress, as one of the most important environmental stresses, has a negative effect on plant performance andreduces plant productivity. Biofertilizers can reduce the effects of drought on plants in water deficit conditions. Thisresearch was carried out to investigate the effects of biological fertilizers on the biochemical characteristics andgrowth of maize SC ۷۰۴ under drought stress in ۲۰۲۲. Five fertilizer treatments including Control, Nitrobacter,Phosphopowerbacter, Potashpowerbacter, and the combination of all three fertilizers were applied under two levelsof irrigation (normal irrigation and drought stress) in ۶ replications. The results showed that drought stress affectedthe proline and leaf chlorophyll content and photosynthetic parameters. At the ۸-leaf stage, the application ofNitrobacter increased photosynthesis and transpiration content by ۳۷% and ۲۷%, respectively. Also, the combinedapplication of biofertilizers at the tasseling stage resulted in a ۳۸% increase in intercellular CO۲ concentration.At the tasseling stage, the combined biofertilizers increased leaf chlorophyll a and proline content by ۶۴% and۱۱۰%, respectively, under drought stress conditions compared to the control. In general, the results showed that theuse of Nitrobacter in normal irrigation and the combined application of biological fertilizers under drought stressconditions more efficiently affected the parameters that are effective in the determination of final crop yield.

کلیدواژه ها:

Drought stress ، chlorophyll ، proline ، photosynthesis ، PGPR