Omara A.A, Azza A. Ghazi and I.A. El-Akhdar( 2016). Isolation and Identification of Zinc Dissolving Bacteria and Their Potential on Growth of Zea maysEgypt. J. Microbiol. 51, pp.29 - 43(2016)
Abstract: TWENTY-FIVE bacterial isolates were isolated from mature compost and evaluated for their solubilization potential of insoluble zinc oxide and zinc carbonate. An efficient zinc-solubilizing bacterial isolate (Zn14) were chosen. Thereafter, some morphological and biochemical characteristics as well as 16S rRNA sequence indicated that the isolate belonged to Enterobacter cloacae. The effect of various carbon and nitrogen sources on the efficiency of Zn solubilization were investigated under shaking and static conditions. The selected bacterial strain could solubilize Zn compounds under a
wide range of nutrient types. A pot experiment was conducted at Sakha Agricultural Research Station, Sakha, Kafrelsheikh, Egypt to study the efficiency of using
Enterobacter cloacae as an in vivo Zn solubilizer either alone or with amended zinc compounds (ZnO and ZnCO3) to the soil and its effect on growth parameters of Zea mays under sterile and non-sterile soil at the age of 30 and 60 days. There was a highly significant response for increased Zn uptake in all treatments compared to the control. The treatment with ZnO and E. cloacae was the more effective in terms of total chlorophyll plant dry weight compared to the control. To solve zinc nutrition problem using a biofertilizer, it is obvious that E. cloacae is capable of solubilizing insoluble zinc compounds by inoculation to increase crop growth and improve soil fertility.
Keywords: (ZnO, ZnCO3, Enterobacter cloacae, Zea mays.)
