Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 19, Issue 3, 2017; Page No.(681-692)

VALIDATION OF ALCALIGENES FAECALIS RBL1 EFFICACY ON ZINC SOLUBILIZATION IN SORGHUM BICOLOR RHIZOSPHERE SOILS

ROBERT ANTONY A., NIVAS D., CHANDRU S., SANGEETHA DEVI R., KANNAN K. AND RAJESH KANNAN V.

Abstract

Soil fertility is a major substance in the sustainability of agricultural production on using essential micronutrients resources in cereal crops to avoid malnutrition in human health. To this, soil borne bacteria were isolated from cereal of Sorghum bicolor rhizosphere soils, which were screened for the property of solubilization of insoluble and partially soluble zinc compounds. Out of ten bacterial isolates, Alcaligenes faecalis RBL1 had showed the best solubilizing of Zn nutrient substances by forming 18 mm clear haloes on solid medium. Though, the solubilization of these substances was accompanied by an increase in the H+ concentration of the medium from 7.2 to 4.8 after 7 days; almost an outcome of the production of several organic acids were detected by FT-IR and GC-MS, further confirmed with amplification of responsible major acid production gene glutamate dehydrogenease (gdh) in A. faecalis RBL1. The present study has been revealed that A. faecalis RBL1 as a potential Zn-solubilizing rhizobacteria and steadily increase, offers an attractive way to replace of chemical fertilizers for enhance of Zn micronutrient levels.

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