Effect of growth-promoting rhizobacteria on nutrient uptake of bean root under drought stress

Drought stress is one of the limiting factors for plant growth and has an important effect on the absorption of micro and macro elements. In order to investigate the effect of growth-promoting rhizobacteria on the uptake of nutrients in bean root, a factorial experiment was performed in three replications. Experimental treatments included bacterial inoculation factor for growth stimulation at two levels (inoculation and non-inoculation of bacteria) and drought stress factor at three levels (no drought stress, mild drought stress and severe drought stress). The results showed that the simple effect of drought stress and bacterial inoculation was significant for all studied traits at a probability level of one percent. Also, all studied traits were affected by the interaction of drought stress and bacterial inoculation. The results of mean comparison showed that the highest levels of nitrogen, potassium and phosphorus of bean root were observed in the treatment of drought stress and inoculation of growth-promoting bacteria. In contrast, the lowest levels of nitrogen, potassium and phosphorus of bean root were observed in the treatment of severe drought stress and non-inoculation of growth-promoting bacteria. The results of iron, zinc, copper and manganese showed that the mentioned traits were affected by drought stress and increasing stress reduced them, while inoculation of growth-promoting rhizobacteria was able to increase the amount of iron, zinc, copper and manganese elements of the roots. The results of correlation coefficients showed that there was a positive and significant correlation between all studied elements in bean root.

کلیدواژه ها:

Bean ، drought stress ، inoculation ، root