Abstract
An experiment was carried out for identification and determination of malathion degrading phosphate solubilizing bacteria isolated from the agricultural fields. In this study, malathion degrading phosphate solubilizing bacteria were identified using NBRIP (National Botanical Research Institute’s phosphate growth medium) media. A number of bacterial colonies were screened from agricultural fields. From primarily screened colonies 4 isolates were identified as phosphate solubilizing bacteria through qualitative and quantitative analysis. The isolated 4 bacterial colonies were inoculated in NBRIP broth media enriched with malathion pesticides to observe degradation of malathion pesticide under incubation study at three different temperatures (25°C, 30°C and 37°C). However, all the four isolates showed capability in degrading malathion pesticide. The study clearly revealed that phosphate solubilizing bacteria can be used in bioremediation of environmental pollution caused by malathion pesticide.
Highlights
Bangladesh is facing many challenges in agricultural sector in the coming years
Ndung’u-Magiroi et al (2012) showed a positive and highly significant correlation between Phosphate Solubilizing Bacteria (PSB) and phosphate-solubilizing microorganism (PSM) populations, organic C, exchangeable Ca and exchangeable Mg, while pH and extractable P did not correlate with the PSB population
Two bacteria named as Raoultella ornithinolytica and Pseudomonas pseudoalcaligenes isolated from agricultural soil of Sirajgonj, Pseudomonas pseudoalcaligenes and Bacillus cereus were isolated from moist soils of Tangail and lastly Pseudomonas aeruginosa and Bacillus subtilis were isolated from relatively moist agricultural field of Gazipur
Summary
Bangladesh is facing many challenges in agricultural sector in the coming years. In order to secure food demand for its vast population, more toxic chemicals are used that have reputations of speed and effectiveness to increase food production. They provide unquestionable benefit for agricultural production, even though, as a consequence, low amounts of some residues may persist in the food supply, air, water and soil and could constitute a significant exposure pathway for humans (Ghorab & Khalil, 2016). Pesticide biodegradation by microorganisms has been documented in a wide range of habitats, including soils, ground water and sewage sludges etc. Insecticides and their degradation products generally get accumulated in the top soil and influence the population of various groups of soil microbes and their biochemical activities like nitrification, ammonification, decomposition of organic matter and nitrogen fixation (Agnihotri et al, 1981). The efficiency of the isolated microorganisms to metabolize malathion in order to develop safe, convenient and economically feasible methods for pesticide detoxification would be investigated under this study
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