Table 1.

Experimental setups

Experiment	Growth conditions	Compartment studied	Main objective
I	Maize in the field	Bulk soil vs. root endosphere	Define main root microbiome (field setup)
II	Maize in field-soil filled pots	Bulk soil vs. root endosphere	Define main root microbiome (growth chamber setup)
III	Maize in field-soil filled pots and in vitro	Root endosphere of plants grown in soil- vs. in vitro-	Define origin of root microbiome = seed or soil
IV	Maize in field-soil filled pots under control and chilling conditions	Root endosphere of maize grown under control vs. chilling conditions	Define chilling-responsive families
V	Maize in field-soil filled pots under control and chilling conditions	Root endosphere of maize grown under control vs. chilling conditions	Define chilling-responsive families