ovule primordium The transition from ovule primordium to ovule occurs when an integument (PO:0020021) begins to develop from the protoderm (PO:0006210). portion of ovule primordium tissue (exact) PO:0000018 plant_anatomy PO_GIT:465 胚珠原基（可視的） (Japanese, exact) primordio de &#243vulo (Spanish, exact) A floral structure primordium (PO:0025477) that is committed to the development of an ovule (PO:0020003). floral organ primordium