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Enterobacter asburiae KE 17 association regulates physiological changes and mitigates the toxic effects of heavy metals in soybean
Author(s) -
Kang S.M.,
Radhakrishnan R.,
You Y.H.,
Khan A.L.,
Lee K.E.,
Lee J.D.,
Lee I.J.
Publication year - 2015
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/plb.12341
Subject(s) - biology , salicylic acid , proline , abscisic acid , biochemistry , chlorophyll , lipid peroxidation , botany , amino acid , food science , antioxidant , gene
Abstract This study aimed to elucidate the role played by Enterobacter asburiae KE 17 in the growth and metabolism of soybeans during copper (100 μ m Cu) and zinc (100 μ m Zn) toxicity. When compared to controls, plants grown under Cu and Zn stress exhibited significantly lower growth rates, but inoculation with E. asburiae KE 17 increased growth rates of stressed plants. The concentrations of plant hormones (abscisic acid and salicylic acid) and rates of lipid peroxidation were higher in plants under heavy metal stress, while total chlorophyll, carotenoid content and total polyphenol concentration were lower. While the bacterial treatment reduced the abscisic acid and salicylic acid content and lipid peroxidation rate of Cu‐stressed plants, it also increased the concentration of photosynthetic pigments and total polyphenol. Moreover, the heavy metals induced increased accumulation of free amino acids such as aspartic acid, threonine, serine, glycine, alanine, leucine, isoleucine, tyrosine, proline and gamma‐aminobutyric acid, while E. asburiae KE 17 significantly reduced concentrations of free amino acids in metal‐affected plants. Co‐treatment with E. asburiae KE 17 regulated nutrient uptake by enhancing nitrogen content and inhibiting Cu and Zn accumulation in soybean plants. The results of this study suggest that E. asburiae KE 17 mitigates the effects of Cu and Zn stress by reprogramming plant metabolic processes.