Transfer of degradative plasmids from a rhizobacterium to single and multiple mixed recipients
2014
Wei, Heping | Wang, Yujing | Zhou, Chenhao | Jiang, Qiuyue | He, Xiaoli | Chen, Jun | Xiao, Ming
Towards efficient application of horizontal gene transfer (HGT) techniques to soil remediation and agronomic production, transfer of plasmids involved in phenol degradation from a rhizobacterium to single and multiple recipients was investigated in soil. Regardless of single or multiple recipients, all transfer frequencies in soil with corn, wheat and tomato seedlings were significantly higher than those in soil without plants, indicating that plants can promote transfer of degradative plasmids among rhizobacteria. By and large, plant type had a low influence on transfer rate of degradative plasmid among rhizobacteria. The transfer of the degradative plasmid from the rhizobacterium to a mixture of 4–6 types of recipient produced higher transfer frequencies, phenol biodegradation and plant growth promotion than transfer to a single recipient or to 2–3 types of recipient. In most cases, the increase in transfer frequency correlated with promotion of plant growth and a decrease in phenol content. These results indicate that the presence of multiple strains as recipients significantly increases the overall transfer frequency and leads to the promotion of soil remediation and plant growth, which is important for application of HGT techniques to soil remediation and agronomic crop production.
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