Metabolism-mediated induction of zinc tolerance in Brassica rapa by Burkholderia cepacia CS2-1

Sang-Mo Kang; Raheem Shahzad; Saqib Bilal; Abdul Latif Khan; Young-Hyun You; Won-Hee Lee; Hee-La Ryu; Ko-Eun Lee; In-Jung Lee

doi:10.1007/s12275-017-7305-7

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Metabolism-mediated induction of zinc tolerance in Brassica rapa by Burkholderia cepacia CS2-1: Sang-Mo Kang ¹, Raheem Shahzad ¹, Saqib Bilal ¹, Abdul Latif Khan ², Young-Hyun You ³, Won-Hee Lee ¹, Hee-La Ryu ¹, Ko-Eun Lee ¹, In-Jung Lee ¹; Journal of Microbiology 2017;55(12):955-965.
DOI: https://doi.org/10.1007/s12275-017-7305-7
Published online: December 7, 2017

¹School of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea, ²Chair of Oman’s Medicinal Plants and Marine Natural Products, University of Nizwa, Nizwa 616, Oman, ³Microorganism Resources Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea

Corresponding author: In-Jung Lee , Tel: +82-53-950-5708,

Received: 27 July 2017 • Revised: 1 November 2017 • Accepted: 8 November 2017

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Abstract

Brassica rapa (Chinese cabbage) is an essential component of traditional Korean food. However, the crop is often subject to zinc (Zn+) toxicity from contaminated irrigation water, which, as a result, compromises plant growth and production, as well as the health of human consumers. The present study investigated the bioaccumulation of Zn+ by Burkholderia cepacia CS2-1 and its effect on the heavy metal tolerance of Chinese cabbage. Strain CS2-1 was identified and characterized on the basis of 16S rRNA sequences and phylogenetic analysis. The strain actively produced indole-3-acetic acid (3.08 ± 0.21 μg/ml) and was also able to produce siderophore, solubilize minerals, and tolerate various concentrations of Zn+. The heavy metal tolerance of B. rapa plants was enhanced by CS2-1 inoculation, as indicated by growth attributes, Zn+ uptake, amino acid synthesis, antioxidant levels, and endogenous hormone (ABA and SA) synthesis. Without inoculation, the application of Zn+ negatively affected the growth and physiology of B. rapa plants. However, CS2-1 inoculation improved plant growth, lowered Zn+ uptake, altered both amino acid regulation and levels of flavonoids and phenolics, and significantly decreased levels of superoxide dismutase, endogenous abscisic acid, and salicylic acid. These findings indicate that B. cepacia CS2-1 is suitable for bioremediation against Zn+-induced oxidative stress.

Keywords: plant growth-promoting rhizobacterium;zinc toxicity;amino acid;antioxidant;abscisic acid;salicylic acid

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Metabolism-mediated induction of zinc tolerance in Brassica rapa by Burkholderia cepacia CS2-1

J. Microbiol. 2017;55(12):955-965. Published online December 7, 2017

DOI: https://doi.org/10.1007/s12275-017-7305-7

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