Preprint Article Version 1 This version is not peer-reviewed

Improvement of Cadmium Detoxification Potential and Plant Growth Promotion by Bacterial Endophytes

Version 1 : Received: 21 August 2019 / Approved: 23 August 2019 / Online: 23 August 2019 (04:06:54 CEST)

How to cite: Ullah, I. Improvement of Cadmium Detoxification Potential and Plant Growth Promotion by Bacterial Endophytes. Preprints 2019, 2019080235 (doi: 10.20944/preprints201908.0235.v1). Ullah, I. Improvement of Cadmium Detoxification Potential and Plant Growth Promotion by Bacterial Endophytes. Preprints 2019, 2019080235 (doi: 10.20944/preprints201908.0235.v1).

Abstract

Cadmium (Cd) is a heavy metal that suppresses plant growth; however, application of endophytic bacteria can increase resistance of plants against Cd, as well as improve plant growth. Two bacterial endophytic strains were isolated from Solanum nigrum and were identified as Serratia sp. AI001 and Enterobacter sp. AI002 by 16S DNA sequencing. Strains AI001 and AI002, tolerated up to 25 mg/mL Cd in broth culture and showed phosphate solubilization potential in Pikovskaya agar medium. AI001 and AI002 produced indole-3-acetic acid, which was confirmed by gas spectrometry-mass chromatography. Brassica plants stressed with 0, 5, 15, and 25 mg/L Cd showed significant decrease in plant growth, chlorophyll content and biomass, and significant increase in Cd dose-dependent electrolyte leakage. Inoculation of strain AI001 or AI002 significantly enhanced the plant growth attributes of shoot length, root length, chlorophyll content, and biomass as compared to those in uninoculated plants. Reduced glutathione contents in plants stressed with different concentrations of Cd also increased with inoculation of AI001 and AI002. The reason of Cd resistance enhancement in plants by inocula could be due to their greater plant growth promoting activities as well as their antioxidative response.

Subject Areas

endophytic bacteria; indole-3-acetic acid; cadmium accumulation; phosphate solubilization; reduced glutathione

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