Assertion: nodule's rhizobium | /r/Desires | a plant host
Facets:
value: because of this symbiosis
type: CAUSE
value: always
type: TEMPORAL
Source sentences:
text: To express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen.
text: Because of this symbiosis, rhizobia always require host plants and cannot fix nitrogen independently.
text: That is why rhizobium requires a plant host.
text: Rhizobia require a plant host; they cannot independently fix nitrogen.