Characterization of heavy metal tolerance rhizobacteria and its potential in bioremediation

Azamuddin, Emyrah Ilya Maisarah and Ponari, Md Hoirul Azri and Abdullah, Ahmad Zaim Fahmi and Che Amri, Che Nurul Aini and Karim, Mohd Fauzihan (2022) Characterization of heavy metal tolerance rhizobacteria and its potential in bioremediation. In: The Malaysian Society for Microbiology Postgraduate Symposium 2022 (MSMPS2022), 10-11 Aug 2022, Online. (Unpublished)

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Abstract

Abstract: Lead (Pb) is a toxic heavy metal released into the environment through either natural sources or human activity. It can cause harmful effects on plants, human health, and microorganisms. Beneficial microorganisms such as plant growth-promoting rhizobacteria (PGPR) can be used for microbial-assisted phytoremediation processes. However, not all PGPRs are tolerant to a high concentration of heavy metals. Thus, this research aims to analyze the plant growth-promoting features of indigenous rhizobacteria isolated from heavy metal contaminated soil and their tolerance toward Pb toxicity. The heavy metal-contaminated soil collected from a mining site in Tasik Chini, Kuantan, Pahang, was used for rhizobacteria isolation. All rhizobacteria from the soil were screened for phosphate solubilization activity, IAA production, and nitrogen fixation ability. Then isolates that showed the most promising plant growth-promoting features were selected and analyzed for their heavy metal resistance toward Pb. A total of 14 rhizobacteria were successfully isolated from the soil samples. Nine isolates were categorized as gram-positive, while the remaining were gram-negative. Analysis of plant growth-promoting features found that five isolates showed a positive result for all screening tests. Subsequently, heavy metal tolerance analysis of different Pb concentrations found that all isolates can grow at a low concentration of Pb. Interestingly, one isolate (C4) showed growth at concentrations of 4 and 5 mmol L-1. Overall, the study successfully screened the potential rhizobacteria for microbial-assisted phytoremediation. Keywords: Plant growth-promoting rhizobacteria, heavy metal resistant rhizobacteria, lead (Pb), bioremediation.

Item Type:	Conference or Workshop Item (Poster)
Uncontrolled Keywords:	Plant growth-promoting rhizobacteria, heavy metal resistant rhizobacteria, lead (Pb), bioremediation.
Subjects:	Q Science > QR Microbiology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science
Depositing User:	Dr Md Hoirul Azri Ponari
Date Deposited:	25 Jan 2023 11:41
Last Modified:	25 Jan 2023 11:43
URI:	http://irep.iium.edu.my/id/eprint/99801

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