Table 1 Experimental setups

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