Assertion: nodule's meristem | /r/UsedFor | sustained growth
Facets:
value: in indeterminate nodules
type: LOCATION
Source sentences:
text: As this meristem allows for sustained growth in indeterminate nodules, four developmental zones appear: the meristematic region or zone I; the infection-differentiation zone or zone II, where rhizobia are released in the cell and start differentiating; the fixation zone or zone III, where nitrogenase is active; and the senescent zone or zone IV, where symbiosomes are degraded and nutrients recycled (Burton et al., 1998).