role of niresistant rhizobacteria in the growth and niuptake of maize in a calcareous soil

A pot experiment was conducted to elucidate the effects of single and coinoculation of maize plant with bacillus mycoides and micrococcus roseus, indigenous to hms contaminated soils, on the plant growth and uptake of essential nutrients and ni by maize in the soil polluted by 250 and 500 mg ni kg1. at each level of ni contamination, shoot dry weight and nutrients uptake significantly increased in m. roseus and b. mycoides treatments compared to noninoculated plants. the highest plant growth promoting effect was found for b. mycoides at the level of 250 mg ni kg1 and for m. roseus at the level of 500 mg ni kg1 which enhanced plant biomass by 33.2% and 90%, respectively, compared to noninoculated plants. at the levels of 250 and 500 mg ni kg1, shoot ni uptake of plants inoculated with b. mycoides or m. roseus significantly increased compared to noninoculated plants. root ni uptake of plants inoculated with b. mycoides and m. roseus significantly decreased at the level of 250 mg ni kg1 and increased at the level of 500 mg ni kg1 compared to control plants. the lowest ni transfer factor and maximum ni translocation factor were in plants inoculated with b. mycoides at the level of 250 mg ni kg1 and in noninoculated plants at the levels of 500 mg ni kg1. inoculation of plants with b. mycoides and m. roseus may be the effective treatments in ni phytoextraction at the levels of 250 and 500 mg ni kg1, respectively. consortium of two bacteria had the lowest plant dry matter and shoots and roots ni uptake and the maximum transfer factor compared to other treatments at the level of 500 mg ni kg1 that may be the effective treatment in ni phytostabilization.