shoot axis tuber subterranean shoot axis tuber A shoot axis tuber (PO:0004543) that develops below ground. Functions in storage of photosynthate metabolites. This term should be used for tubers derived from branches, as found in Solanum spp. (e.g. potato) or Dioscorea spp. (e.g. yam) and other species. Use the term tuberous root tuber (PO:0025476) for tubers derived from roots, such as those found in Cassava, Ipomoea, or Hemerocallis. PO:0004547 PO_GIT:615 plant_anatomy tub&#233rculo subterr&#225neo (Spanish, exact) 地下塊茎 (Japanese, exact)