Table 1.

Experimental design

Sample	Species	Natural sites		Greenhouse
		Cologne	Eifel	Exp. 1	Exp. 2
Soil		4	4	3	3
Rhizosphere	A. thaliana	4	4	—	—
Root	A. thaliana	4	4	8*	9†
Rhizosphere	C. hirsuta	4	3	—	—
Root	C. hirsuta	4	3	3	3
Root	A. halleri	—	—	3	2
Root	A. lyrata	—	—	2	3

Numerical overview of biological replicate samples per sample type, plant species, and experiments. —, sample types which were not prepared. See Dataset S1 for the detailed experimental design, including the sequencing effort.

^*Three samples of genotype Col, 3x Ler and 2x Sha.

^†Three samples of genotype Col, 3x Ler and 3x Sha.