Tobacco root rot and microorganism communities

Tobacco root rot disease caused by Fusarium spp. is one of the most common and widely distributed soil-borne diseases and often occurs along with tobacco bacterial wilt disease and tobacco black shank disease. However, the microorganism communities associated with the occurrence of this disease in this system remain poorly identified.

New research in Agronomy Journal reports on the characteristics of the microbial community in the rhizosphere of tobacco (Nicotiana tabacum L.) and explores the potential microbiological indicators of tobacco root rot.

The team found that Rubrobacter and Talaromyces spp. may serve as beneficial microbiological indicators of tobacco root rot, and Paenibacillus polymyxa and Trichoderma harzianum may serve as antagonistic strains for biocontrol of the disease.

Bacterial and fungal diversity decreased with the increase in years of continuous cropping. The bacterial and fungal diversity in the rhizosphere with tobacco root rot was higher than that in the healthy rhizosphere. Rubrobacter and Talaromyces spp. were more abundant in the rhizosphere soil of healthy tobacco than in that of diseased tobacco. Treatment with P. polymyxa and T. harzianum led to an increase in the relative abundance of Rubrobacter and Talaromyces spp., implying that it could have a plant-promoting effect.