Table 1.

The effects of plant group (grass, forb or legume), family, species and phylogenetic distance to Chrysanthemum on Simpson (alpha) diversity and community structure (beta diversity) of bacteria and fungi; and the relationship between diversity and community structure of bacteria and fungi and Chrysanthemum biomass of plants in the control treatment without pathogen and plants exposed to Pythium ultimum, and their ratio.

	Bacteria				Fungi
	α‐Diversity		Community structure		α‐Diversity		Community structure
	F	p	R	p	F	p	R	p
Plant group (grass‐forb‐legume)	0.576	0.632	0.035	0.001	2.068	0.108	0.115	0.013
Plant species	1.583	0.034	0.292	0.001	0.851	0.706	0.317	0.001
Plant family	0.805	0.624	0.108	0.002	0.809	0.621	0.165	0.001
Phylogenetic distance	0.049	0.825	0.007	0.054	2.421	0.122	0.024	0.003
Total DW plants	0.175	0.677	0.009	0.002	0.055	0.815	0.012	0.017
DW plants infected with Pythium	0.628	0.429	0.009	0.006	0.477	0.491	0.013	0.008
Relative DW plants	0.066	0.797	0.007	0.310	0.810	0.370	0.007	0.436

Alpha‐diversity was measured with the Simpson index and treatments effects evaluated using linear models. Effects on community structure were evaluated using PERMANOVA.