Endophytic Serratia Sp. Pw7 Shifts Bacterial Endophytes In Wheat (Triticum Aestivum L.) To Reduce Pyrene Contamination

Endophytes in plants are an essential part of plant and participate in the functioning of plants. In this study, the endophytic bacterial communities in the inoculated wheat seedlings were accessed to reveal the effects of functional endophytic bacterium inoculation. The results showed that inoculation with endophytic strain Serratia sp. PW7 shifted endophytic bacterial communities and promoted bacterial diversities in inoculated plant, accompanied with the promotion of pyrene removal and plant growth. Pyrene exposure was beneficial for Serratia sp. PW7 growing and reproducing in the inoculated seedlings, and the endophytic bacterium alteration and pyrene removal were significantly positively correlated with the colonization efficiency of Serratia sp. PW7. The inoculation efficiency was high in those seedlings inoculated via roots and seeds. Inoculation had significant positive effects on the bacterial community diversities and no significant effects on the bacterial richness. More promotion of Shannon indices was observed on bacterial diversity in the inoculated seedlings grown under high pyrene contamination. The Shannon indices of endophytic bacteria in shoots increased by 23.1-37.2% as exposed to 100 mu g center dot L-1 pyrene, and by 70.8-112.5% as exposed to 500 mu g center dot L-1 pyrene.