The Absorption Characteristics and the Genetic Response of Beauveria Bassiana Z1 under Cd2+ Stress

Cadmium (Cd2+) has carcinogenic and teratogenic toxicity, which can be accumulated in the human body through the food chain, endangering human health and life. In this study, a fungus named Beauveria bassiana Z1 was isolated and identified to absorb Cd2+, and its Cd2+ absorption rate was 85.1 % when the Cd2+ concentration was 1 mM. Furthermore, the absorption rate of activated strain was significantly higher than that of inactivated, especially with a high Cd2+ concentration. The genetic response results show that the expression of Reactive Oxygen Species (ROS) scavenging enzyme gene and the stress resistance genes (p-type ATP transferase, heavy metal tolerance protein, cytochrome P450) was up-regulated, which was conducive to the ROS removal and heavy metal modification, thereby improving the tolerance of strain Z1 to Cd2+. The research results are of great significance for elucidating the mechanism of fungi for heavy metal, and provide theoretical support for bioremediation of heavy metal pollution.

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