[Experimental] List of manuscripts available for review volunteers
1 manuscript available for review volunteers
May 16, 2017
Brassica rapa (Chinese cabbage) is an essential part of Korean traditional food, but often has been exposed to increased zinc (Zn+) toxicity due to contaminated irrigated water. This in-turn can be detrimental to human health as well as the plant growth and production. The current study investigates the bioaccumulation of Zn+ by Burkholderia cepacia CS2-1 and improving metal tolerance of Chinese cabbage. CS2-1 was identified on the basis of 16S rRNA sequencing and phylogenetic analysis. The strain was actively producing indole-3-acetic acid (3.08 ± 0.21 µg mL-1) quantified through GC/MS SIM. In addition, CS2-1 was actively producing siderophores, mineral solubilization and resistance against varying concentrations of Zn+. Heavy-metal tolerance was triggered by CS2-1 application by ameliorating the growth attributes, Zn+ uptake, amino acid regulation, antioxidant changes, and endogenous hormonal modulation (ABA and SA) of Chinese cabbage under 1.0 mM Zn+ stress and with and without CS2-1 inoculation. Zn+ application to the root zone significantly hindered plant growth and negatively affected plant physiology, while CS2-1 inoculation improved plant growth, lowered Zn+ uptake, enhanced amino acid regulation and flavonoid and total phenolic contents, and significantly decreased superoxide dismutase, endogenous abscisic acid, and salicylic acid levels. We concluded that CS2-1 is an ideal plant growth regulating bacterial strain for bioremediation against Zn+-induced oxidative stress, as it improves physiohormonal contents, elicits antioxidant defense system, and lowers Zn+ uptake.


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