What your xPlant record already holds
An explant in xPlant records the plant it was taken from and the culture it descends from. Every transfer is dated, carries its passage number and who recorded it, and a culture split into several vessels becomes several records linked back to their source. That is most of the chain above, kept as the work happens rather than rebuilt when an exporter asks for it.
How the parent stock came to the lab has a place in the record too. Each plant has an Acquisitions tab for every delivery, top-ups included: the date it arrived, who supplied it, what arrived — seed, flasks, seedlings, young or mature plants, cuttings or divisions, roots or rhizomes — how many, the country of origin, and the numbers on the paperwork that came with it. If you bought flasks in, the Fish and Wildlife Service asks for records of how you obtained them, including who they came from (50 CFR 23.34(b)(3)). The papers themselves stay with you, attached to the entry as private files, and a record is only as good as what it points at.