Pollution adaptive responses of root-associated microbiomes induced the promoted but different attenuation of soil residual lindane: Differences between maize and soybean.

ABSTRACT

Microorganisms colonize plant-associated environments and constitute complex communities aided in key functions for nutrient acquisition, disease suppression and abiotic stress resistance. In this study, we evaluated the variation of root-associated microbiomes of two typical farmland crops, maize (Zea mays L.) and soybean (Glycine max L. Merr.) respond to organochlorine pesticide stress, taking lindane as an example. Results showed that there were promoted but different attenuation rates of residual lindane in rhizosphere soils during maize and soybean growth, and the differential is due to the comprehensive effects of plant characters and microbial activities. Organochlorine pollution did not have significant impact on the microbial diversity and populations in all rhizo-compartments, but mostly stimulated the microbial connectivity. The multistep and decreasing processes for root-associated microbiomes of both maize and soybean were spatially different and mainly dependent on the shaping roles of host plants. These results expand our understandings of the organochlorine influence on the underground ecological system in crop-dependent soils.