Inoculation with a bacterial consortium alleviates the effect of cadmium overdose in soybean plants |
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Authors: | Iryna Zaets Sergij Kramarev Natalia Kozyrovska |
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Institution: | (1) Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, The Chinese Academy of Science, Wuhan City, 430074, Hubei, People’s Republic of China;(2) Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA; |
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Abstract: | Inoculating plants that have inefficient antioxidant systems with plant-associated bacteria allows them to overcome heavy
metal intoxication. We monitored protein oxidation, the activity of plant defense system enzymes, and the phenolics content
in soybean (Glycine max L.) during a prolonged exposure to cadmium (Cd). The assistance of the bacterial consortium reduced the bioavailability of
Cd in a soil containing 10 times the metal’s Standard Maximum Value (SMV). This reduced the accumulation of Cd in the soybeans’
roots and seeds. At 100 SMV, bacterial inoculation resulted in increased Cd bioavailability, which enhanced cadmium uptake
by the soybean plants. At both Cd concentrations, oxidative stress was more prolonged in the soybean’s roots than its leaves.
In cadmium-polluted soil, glutathion peroxidase activity changed more rapidly in the roots of plants when they had been inoculated.
Inhibition of the peroxidases’ activities strengthened the activity of glutathione-S-transferase; increased the phenolics
content in plant roots; and alleviated stress in inoculated soybean plants compared to untreated plants. The bacterial consortium
may be recommended for a plant protection at 10 SMV Cd in the soil, and for phytostabilization at 100 SMV. |
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