Fig. 5.

Regression analysis of the relationship between the relative abundances of dominant bacterial phyla (A), orders (B) and genera (C, D, E) in the potato rhizosphere with PCS disease severity or tuber yield in 2016. The relative abundance of phyla, orders and genera were significantly higher in plots treated with 225 (B225) or 300 (B300) kg·ha⁻¹ of a microbial product composed of a consortium of Bacillus subtilis and Trichoderma harzianum than in plots treated with 150 (B150) kg·ha⁻¹ of the microbial product or non-treated (CK). The relationship between the relative abundance of each of the designated bacterial taxa in each treatment and tuber yield is indicated by circles; solid lines represent fitted regression lines of the relationship between the relative abundance of each of the designated bacterial taxa and tuber yield. The relationship between the relative abundance of each of the designated bacterial taxa in each treatment and PCS disease index is indicated by triangles; dotted lines represent fitted regression lines of the relationship between the relative abundance of each of the designated bacterial taxa and PCS disease index.