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A Rhizosphere-Derived Consortium of Bacillus subtilis and Trichoderma harzianum Suppresses Common Scab of Potato and Increases Yield

Wang, Zhenshuo, Li, Yan, Zhuang, Lubo, Yu, Yue, Liu, Jia, Zhang, Lixia, Gao, Zhenjiang, Wu, Yufeng, Gao, Wa, Ding, Guo-chun, Wang, Qi
Computational and Structural Biotechnology Journal 2019 v.17 pp. 645-653
Bacillus subtilis, Solanum tuberosum, Streptomyces, Trichoderma harzianum, bacterial communities, beneficial microorganisms, biotechnology, crop yield, potatoes, rhizosphere, soil, species diversity, tubers
The ability of a rhizosphere-derived microbial product (composed of a consortium of a strain of Bacillus subtilis and a strain of Trichoderma harzianum) to suppress common scab disease in potato caused by Streptomyces spp. was examined over a two-year period. Relative to the condition in which 0 kg·ha−1 of the designated microbial product was applied (control), the disease index decreased by 30.6%–46.1%, and yield increased by 23.0%–32.2% in treatments in which 225 or 300 kg·ha−1 of the microbial product was administered, respectively. The bacterial communities present in the rhizosphere were assessed at an early stage of tuber formation, a time at which tubers are susceptible to common scab. Potato plants in which soils were treated with 225 or 300 kg·ha−1 of the microbial product harbored rhizospheric microbiota with lower α-diversity and an increased relative abundance of taxa representing the beneficial bacteria. In summary, a select microbial product composed of a consortium of Bacillus subtilis and Trichoderma harzianum effectively suppressed common scab disease and increased tuber yield by establishing a high relative abundance of beneficial bacteria in the rhizosphere.